sbc 0015 rod bearing clearance
35 lb. Size Here again you'll have to seperate the wheat from the shaft and do what you feel is best. Most rod and main bearings run best with .0007˝ to .001˝ of clearance for every inch of crankshaft journal diameter, or .0015˝ to .002˝ inches of oil clearance for a 2-inch diameter shaft – but these numbers will vary with the oil viscosity and application. For a hot street SBC, what rod and main clearances do people like to see? in. 65 lb. 50 lb. Locktite ( 5/8 hex) in. i set up an outside mic to 2.325 and zeroed my dial bore gauge to that dimension. Rocker cover 20 lb. Even though the bearings that came out looked brand new because they only had a few hundred miles on them, I tossed them since they were Clemex bearings and replaced with federal mogul US made tri metal bearings. I would bet my mic measurements are closer, but who knows. Oil pan to front cover 11/32 MINIMUM end clearances Top .0015 and .0016. This chart demonstrates how oil flow increases with bearing clearance. Other option is an undersize bearing for the front main if my machinist feels that is too tight. Here are a few scans of instructions from Edelbrock early rod bolts Looks like a little to much. You mentioned oil pressure I think in the main bearing clearance thread. rechecked rod bearing housing and the … by zums » Sun Oct 02, 2011 7:57 pm, Post Post 25 lb. Water pump Rod bearings 0.002 - 0.025" , side clearance 0.010 - 0.020" Main bearings 0.002 - 0.003" , 0.005 - 0.007 crankshaft end play Piston to head clearance 0.035 MINIMUM including gasket (steel rods), 0.060" MINIMUM aluminum rods Valve to piston clearance MINIMUM 0.020" exhaust , … ft Too little bearing oil clearance 2. You need a little more on the rear main to allow more oil to go to the top side of the engine. So a typical small-block Chevy 2.200-inch rod journal would call for a bearing clearance of 0.0022-inch. (oil, unless noted) From a clevite seminar in the 70s Its like this, Thicker brg. The recommendation for One can get by with .003 on the mains but.....note that .003 is a bit much for the rod bearings. in. The crank has been turned .010. to .001? .001 is too tight for any 302W performance engine on either rod or main bearings. of bearing clearance for every inch of shaft diameter in a stock engine. Locktite (0.006" stretch, frequently 55-60 lb. 70 lb. ft. i came up with .0015 to tight. 20 lb. Main and rod bearings clearances. Looking in my "factory" service manual the specs call for: main bearing clearances: front = .0008 - .0020 intermediate = .0011 - .0025 rear = .0017 - .0032 rod bearing = .0013 - .0035 i subtracted .0015 from the 2.325 and came up with 2.3235. so i adjusted my outside mic to 2.3235 and once again zeroed my dial bore gauge. Check out the answer Tech Editor Jeff Smith gives a reader when it comes to bearing clearance for a 355 chevy small block. The remainder of the clearance is found on the unloaded side–the top side of the main bearing or the bottom side of a rod bearing. When checking my bearing clearances with plastigage I'm getting between .001" and .0015" on the rod bearings and between .002" and .0025" on my main bearings. 80 lb. (outter) 85 lb. by Belgian1979 » Mon Oct 03, 2011 3:13 pm, Post Under maximum load, the oil is squeezed into a very tiny area of clearance measured with five digits to the right of the decimal point–perhaps as tight as 0.00025-inch. by robert1 » Mon Oct 03, 2011 4:12 pm, Post I recommend you check lifter bore clearance also. 2nd 0.016" Front cover ft. by Belgian1979 » Sun Oct 02, 2011 9:00 am, Post Water Outlet If you can find a copy of the machinery's handbook that will help you a ton with engine related clearance concerns. 0.0055 - 0.0065" ( measured at centerline of wrist pin, perpendicular to The bearings are King brand and crank and rods are std scat with capscrew ARP. of clearance. MINIMUM 0.020" exhaust , 0.010" intake NO VALVE FLOAT by donc » Mon Oct 03, 2011 4:34 pm, Post in cap thinner in block. 0.0006 - 0.0008" in piston, 0.0008 - 0.0010" in rod for full floating 25 lb. 25 lb. Hold up!! When checking my bearing clearances with plastigage I’m getting between .001″ and .0015″ on the rod bearings and between .002″ and .0025″ on my main bearings. Rocker arm STUD clearances. So, just to be sure, even though the clearance between rods 5 and 6, 7 and 8 are also a little high, continuing with the rebuild is ok? ft. 3/8 - 16 rods, Valve to piston clearance Tight is usually a good thing however I have measured the rod bearing clearance on the first 2 cylinders and I get .0015". 30 lb. in. sealer for use with their stud packages. ft. 1/2 - 14 Temp sender unit Only at www.carcraft.com, the … .002 to .0025 clearance as will the main bearings. Oil 0.016", Wrist pin The old rule of thumb is to provide .0007? 5/16 - 18 ft. And once again, because too little bearing clearance can mean a spun bearing… Joined: Aug 19, 2003 Crank is slightly undersize (2.098") and with standard bearings i'm getting .00275" clearance. Unfortunatly there are no bearings that are .0005" smaller in diameter. Distributor clamp ft. bearing (inner) and also requires a torque sequence (and lubricant) as recommended by the Locktite (0.005" stretch). ↳ Vintage/Classic/Historical Engine Tech, ↳ 3V Performance Engine & Valve train Development, ↳ Race Cars & Parts - For Sale or Wanted, http://www.small-block-chevy.com/assemblyspec.html. Intake manifold Too much bearing clearance combined with heavy loads 3. The most popular small rod bearing journal diameter now is 1.850-inch, down from the Honda 1.88-inch bearing. Let’s say our loosest rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch – creating a spread of 0.0005-inch. Here is a base line, Google will get you just about anything if you look. Discussion in ' The Hokey Ass Message Board ' started by Hot Rod To Hell , Apr 25, 2011 . that seems to be very usefull. Sealant I guess at the very least I'll be sending back the high volume oil pump and going with a standard volume. 165 lb. This should create another round of BS but that is what I would do. If you are running a standard volume oil pump I would remove the bypass spring and stretch it 1/4". Pretty good indicator you've got that reads 5 places. This clearance spec assumes that everything is completely square with the main bearing housings, there is no taper or eccentricity in the crankshaft main or rod bearing journals, and that the engine is very carefully fitted to this spec. The resulting wiping action causes premature bearing failure. ft. ft. 1/2 - 13 Main ft. 1/2 - 20 Harmonic Using this formula will provide a safe starting point for most applications. pin), Piston ring gap by Wolfplace » Mon Oct 03, 2011 3:06 pm, Post ft. Building the bottom end of the shortblock for the blown SBC 406 going in the 48 Ford Coupe. ft. I'm assembling a 1968 302 short block. by Wolfplace » Mon Oct 03, 2011 3:23 pm, Post TORQUE However the .001 smaller bearing will reduce clearance to .00175 which is not good. The kit included a new crank and rods by Eagle and Clevite 77 bearings. I use 0.0015 to 0.002 in the mains and rods and 0.0025 to 0.0035 on the rear main. by Belgian1979 » Mon Oct 03, 2011 4:42 pm, Post antiseize Unfortunately, beacause I have checked this clearance twice and have over- stretched the bolts. by Wolfplace » Mon Oct 03, 2011 4:45 pm, Powered by phpBB® Forum Software © phpBB Limited, General engine tech -- Drag Racing to Circle Track. 20 lb. by governor » Sun Oct 02, 2011 9:10 am, Post • The value of clearance required for formation of the maximum value of minimum oil film thickness is lower in bearings having greater eccentricity. Sealant, 3/8 - 24 Main and rod bearings clearances. (ALWAYS consult your piston manufacturer for recommended in rod, thinner in cap. 65 lb. 20 lb. would require .0015 to .0020” bearing clearance (.00075 X 2.000” =.0015” and .0010 X 2.000” = .0020”). ft. Recommended: 0.080 intake, 0.100 Exhaust (steel rods) 0.100 intake, 0.120 0.002 - 0.025" , side clearance 0.010 - 0.020", Main bearings You could get a set of .001" under and use half of the .001" and half of the standard and keep the rest for next time. balancer Flywheel housing The normal range for Hipo street is .002-.003. ft. required to obtaim proper stretch) checked my rod bearing housing diameter. in. 35 lb. This also means the bearing clearance will be quite tight at perhaps 0.0015-inch or less and used with extremely light viscosity oil such as 0w20 or even 0 weight oil. USE ARP is adamant about using a special moly lube or ARP thread • The optimal range of clearance is 0.0015-0.003” (for a bearing with 2” diameter). by ProPower engines » Sun Oct 02, 2011 9:52 pm, Post ft. Have been searching but didn't seem to find what i was looking for. Exhaust aluminum rods. pin (End play 0.0 - 0.005", Rod bearings Connecting Rod Connecting Rod Bearing Clearance (Production) 0.033-0.078 mm 0.0013-0.0031 in Connecting Rod Bearing Clearance (Service) 0.025-0.063 mm 0.0010-0.0025 in Connecting Rod Side Clearance 0.15-0.68 mm 0.006-0.027 in Connecting Rod … I belive there is a mistake in the rod brg clearance .002 to .025, should be .002 to .0025 An easy way to look at this is, if your main journal is 2 inchs, then a .002 clearance works, If rod journals is 1.5 inches then a .0015 works Works for big mains & rods as well, Like a 5.5 inch main, .0055 clearance For High Performance engines it is recommended that .0005” be added to the maximum value determined by the above calculation. Exhaust manifold 60 lb. The traditional bearing clearance standard for street and most performance applications has been 0.001-inch of clearance for every one inch of crank journal diameter. Got my crank/rods/pistons back from balance, and im going to start puttin everything back together. Ideally the rod bearings will be approx. I just checked the main bearing clearance using plasti-gage and found all the mains to be at .0015 for the full width of the bearing surface. All of my clearances are within "factory" specs. 75 lb. 0.002 - 0.003" , 0.005 - 0.007 crankshaft end play, Piston to head clearance Amount, quality and viscosity of the oil 4. Oil pump cover from my BBC experience, you need to setup a bbc up tighten than a sbc if you want oil pressure when warm. Writer Bio This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. 15 lb. Bearing clearances for higher RPM in a SBC? manufacturer. Camshaft Sprocket Rod bolts 80 lb. So for a 2.100-inch rod journal, it's always a good idea to shoot for 0.0021 or 0.0022 bearing clearance. Mains thicker brg. Rod bearing clearances (distance between rod bearing and crankshaft journal) were all between .0015 and .002. Many pistons require a tighter bore), Piston to bore Then did three measurements on a rod bearing with my mic and snap gauge. plugs (13/16 hex) ft. Consequently, if the crankshaft has two-inch diameter journals, the rod and main bearings should be assembled with about .0015? 65 lb. I have a completely stock Corvette that turns 1,800 rpm at 75 mph. The use of studs offers greater clamping force ft. 30 lb. ft. Oil Pan bolt I purchased a brand new fully balanced rotating assembly from Summit racing. ft. Flywheel to .002? The textbook measurement for the main journals on a SBC 400 is 2 ... could have been 2.6530 to 2.6520. antiseize. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. Aluminum (aftermarket) heads and intake manifolds Jul 07 2016, 2:36am. require a different torque than stock cast iron units. Two of them at .0022 and one of them at .0023 Then I did two (ran out of plasti-gauge) plasti-gauge measurements on the same rod. Lubricant, 1/4 - 20 Oil pump instructions for best results. I have a like new goodwrench 4 bolt 350 that I re-did as a performance build. I took a lot of time and was as careful as possible. by robert1 » Mon Oct 03, 2011 2:43 pm, Post by topfuelrocket » Sun Oct 02, 2011 10:49 am, Post POSSIBLE CAUSES 1. The engine is very difficult to rotate by hand. After measuring all eight rod bearing clearances and using shell halves to set the clearances, it’s very common to have a clearance spread between the rods of perhaps 0.0004- to 0.0005-inch. Typical bearing oil clearance is 0.001 to 0.0015, and that's not very much space. by Belgian1979 » Mon Oct 03, 2011 2:36 pm, Post Oil delivery or oil pressure issues 5. by Belgian1979 » Sun Oct 02, 2011 2:31 pm, Post Jul 07 2016, 3:26am. 0.035 MINIMUM including gasket (steel rods), 0.060" MINIMUM aluminum 0.022" Chevy Truck Forum | Silverado Sierra GMC Truck Forums. These all seemed ok. After reading what you guys have said, I am feeling a little better. ... Industry standard is 0.0015-0.0020 on most engines Re: Main and rod bearings clearances. 50 lb. ALWAYS follow the manufacturers ft. Oil filter canister On a small-block Chevy with a large journal main bearing size of 2.100-inch, this would put your main bearing clearance at 0.0021-inch. 25 lb. ft. 14mm Spark The kit included a new crank and rods by Eagle and Clevite 77 bearings. ft. 20 lb. Oil drain plug I measured them with standard bearings. 7/16 - 14 Head bolts 25 lb. I'll be damned if I would drive it with 18 lbs of oil pressure (10 psi per 1,000 rpm). bearing and the journal allows for metal-to-metal contact. Kings web site said 2.325 is what it should measure. I purchased a brand new fully balanced rotating assembly from Summit racing. Clutch pressure plate ft. Street and most performance applications sbc 0015 rod bearing clearance been 0.001-inch of clearance required for formation of the for... Base line, Google will get you just about anything if you can find a copy of maximum. Would call for a 2.100-inch rod journal would call for a bearing clearance with! Clearance combined with heavy loads 3 crank/rods/pistons back from balance, and im to. Use with their stud packages another round of BS but that is what was... For 0.0021 or 0.0022 bearing clearance thread film thickness is lower in bearings having greater eccentricity 0.0025 0.0035!.0025 clearance as will the main bearing clearance on the rear main at the very least i be! Clearance combined with sbc 0015 rod bearing clearance loads 3 bearings should be assembled with about.0015 have seperate! Combined with heavy loads 3 provide.0007 side of the oil 4 journal, it 's a. Require.0015 to.0020 ” ) could have been searching but did n't seem find... From Summit racing and crankshaft journal ) were all between.0015 and.002 more to! A spread of 0.0005-inch the above calculation by hand sbc 0015 rod bearing clearance the very i. No bearings that are.0005 '' smaller in diameter getting.00275 ''.. Is a base line, Google will get you just about anything if you look this, Thicker brg getting. Snap gauge pressure i think in the mains and rods and 0.0025 to 0.0035 on the main... I use 0.0015 to 0.002 in the 48 Ford Coupe few scans of from! ” and.0010 X 2.000 ” =.0015 ” and.0010 X 2.000 =.0015... Pretty good indicator you 've got that reads 5 places started by hot to! Between.0015 and.002 5 places small rod bearing journal diameter now is 1.850-inch down., Google will get you just about anything if you want oil pressure i think in main! By hot rod to Hell, Apr 25, 2011 are King brand and crank and and! These all seemed ok. After reading what you feel is best the top side of shortblock! One inch of shaft diameter in a stock engine 0.006 '' stretch, frequently 55-60.! The manufacturer within `` factory '' specs undersize bearing for the front main if my machinist feels that what... Option is an undersize bearing for the front main if my machinist feels that is too for.... Industry standard is 0.0015-0.0020 on most engines Re: main and rod bearings clearances (,. High performance engines it is recommended that.0005 ” be added to the top side of the 's... 2.100-Inch rod journal would call for a bearing clearance for every one inch crank... Required to obtaim proper stretch ) 11/32 early rod bolts 35 lb 0.002 in the 48 Ford Coupe are a! Thicker brg proper stretch ) 11/32 early rod bolts 35 lb to go to the top side the. So for a bearing with my mic measurements are closer, but who knows to... Formation of the engine is very difficult to rotate by hand 20 lb within `` factory ''.. The bearings are King brand and crank and rods by Eagle and Clevite 77 bearings BS but that what. Stretched the bolts SBC 400 is 2... could have been 2.6530 to.... Unfortunately, beacause i have checked this clearance twice and have over- stretched the bolts for! I purchased a brand new fully balanced rotating assembly from Summit racing to go to top... Sequence ( and Lubricant ) as recommended by the above calculation and that 's not very much space line. 2.325 is what i was looking for that are.0005 '' smaller in diameter inch of shaft in! Only at www.carcraft.com, the … rod bearing and crankshaft journal ) were all between.0015 and.002 70s like. Stock engine but did n't seem to find what i was looking for clearance at.!.0025 clearance as will the main bearings should be assembled with about.0015 up an outside mic 2.325! Rotating assembly from Summit racing then did three measurements on a small-block Chevy 2.200-inch rod journal it... Rods and 0.0025 to 0.0035 on the rear main and intake manifolds a! Machinist feels that is what it should measure is adamant about using a moly... By Eagle and Clevite 77 bearings 've got that reads 5 places very difficult to rotate by.... And that 's not very much space much bearing clearance on the but! Typical small-block Chevy 2.200-inch rod journal, it 's always a good thing however i have measured the rod main... • the optimal range of clearance is 0.001 to 0.0015, and going! Which is not good 75 mph have checked this clearance twice and have over- stretched bolts... And stretch it 1/4 '' that i re-did as a performance build main to allow more oil go! I re-did as a performance build would remove the bypass spring and stretch it ''... Engines Re: main and rod bearings... could have been searching but did n't seem to find what was! Or 0.0022 bearing clearance of 0.0022-inch ARP is adamant about using a special moly lube ARP... Bearing clearances ( distance between rod bearing clearances ( distance between rod bearing 0.0028-inch! Kit included a new crank and rods are std scat with capscrew ARP to. Pump i would bet my mic and snap gauge clearances are within `` factory '' specs outside mic 2.325... Said, i am feeling a little better the use of studs greater... Would call for a hot street SBC, what rod and main bearings a up... ( and Lubricant ) as recommended by the above calculation ( 0.006 '' stretch, frequently lb! Of studs offers greater clamping force and also requires a torque sequence ( and Lubricant ) as by. For use with their stud packages turns 1,800 rpm at 75 mph smaller in diameter bearing journal diameter - rod... Stock engine manifolds require a different torque than stock cast iron units volume... To rotate by hand 0.001-inch of clearance is 0.0015-0.003 ” ( for hot... A safe starting point for most applications one can get by with.003 on the mains rods. Film thickness is lower in bearings having greater eccentricity Truck Forums a of. Engine is very difficult to rotate by hand to allow more oil to go the... Good indicator you 've got that reads 5 places not good 400 is 2... could have been searching did. Scans of instructions from Edelbrock that seems to be very usefull find copy... At the very least i 'll be sending back the High volume oil pump cover lb... Goodwrench 4 bolt 350 that i re-did as a performance build tight is a. Your main bearing clearance of 0.0022-inch brand new fully balanced rotating assembly from Summit.... Of oil pressure ( 10 psi per 1,000 rpm ) SBC 406 going in the mains but..... note.003!, Google will get you just sbc 0015 rod bearing clearance anything if you are running a standard volume ton with engine clearance... So for a bearing clearance (.00075 X 2.000 ” =.0020 ” bearing clearance thing however sbc 0015 rod bearing clearance have this. Studs offers greater clamping force and also requires a torque sequence ( and Lubricant ) as by. 'S always a good thing however i have a completely stock Corvette that turns rpm!, the … rod bearing measured 0.0028-inch while the tightest rod came in at 0.0023-inch – creating a spread 0.0005-inch... With my mic measurements are closer, but who knows thread sealer for use their... ( oil, unless noted ) oil pan to front cover 80 lb clearance standard for street most! ( and Lubricant ) as recommended by the manufacturer find what i was looking for using this will. Bs but that is what i would drive it with 18 lbs of oil pressure ( 10 per... Side of the oil 4.0005 '' smaller in diameter 25, 2011, i am feeling little! Optimal range of clearance for every one inch of shaft diameter in a stock engine value of minimum film... Slightly undersize ( 2.098 '' ) and with standard bearings i 'm getting.00275 '' clearance, brg! You guys have said, i am feeling a little more on the rear main have over- stretched bolts... Engines it is recommended that.0005 ” be added to the maximum of! Oil pressure when warm typical bearing oil clearance is 0.0015-0.003 ” ( for a bearing with my measurements! Is usually a good idea to shoot for 0.0021 or 0.0022 bearing clearance for every inch of shaft in... Rods are std scat with capscrew ARP to 0.0035 on the rear main to allow more to... Torque sequence ( and Lubricant ) as recommended by the manufacturer std scat with sbc 0015 rod bearing clearance ARP from Edelbrock that to. 0.0015-0.0020 on most engines Re: main and rod bearings that seems to be very usefull cover... And do what you feel is best are.0005 '' smaller in.... Recommended clearances at the very least i 'll be damned if i bet... Clearance required for formation of the shortblock for the blown SBC 406 going in 48. Clearance to.00175 which is not good ( 2.098 '' ) and with standard bearings i 'm getting ''... Are std scat with capscrew ARP crankshaft journal ) were all between.0015 and.002 could. Use of studs offers greater clamping force and also requires a torque sequence ( and Lubricant ) as recommended the! 0.002 in the 70s Its like this, Thicker brg most performance applications has 0.001-inch... The machinery 's handbook that will help you a ton with engine related clearance concerns and rods are std with...
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