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#1
11-28-2010, 02:53 PM
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no dividing. measure the main bearing id with main torqued, measure crank journal. subtract little number from big number, hope you don't have to chase clearances too much. happy measuring!
Last edited by tininjun67; 11-28-2010 at 02:53 PM. Reason: spelling |
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#2
11-28-2010, 06:58 PM
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Use a dial bore gauge and a outside mic,torque main bearings using correct lube in fasteners,measure crank with mic,set dial bore gauge off of mic to 0 ,then rock dial bore gauge inside bearing and see difference on gauge,this is absolutely the best way to measure bearing clearance,same procedure for rod bearings.BillC.
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Checkered Flag Machine & Ceralli Competition Engines Racing engines and induction development http://www.checkeredflagmachine.net/ |
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#3
11-28-2010, 07:10 PM
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thanks, i was using the snap style then using a mic to measure that, i will find a bore gauge this week, even if i have to buy one.
using the mike and snap it looks like i was at.003 on mains and rods. this was at teardown (about 1500-2000 miles) with the F/M standard bearings. i will post more when i can trust my measurements. -RB
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 1970 gto (4spd) 462 500 hp [email protected] / 1.843 60'/ 3980 lbs 1964 corvette roadster 1968 corvette roadster 1962 corvette "equal rights, not equal things" if you want to know the future, read "atlas shrugged" I dont race a 4spd because it is easy, I race a 4spd because it is hard. 
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#4
11-30-2010, 01:26 AM
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what Bill said. don't trust the snap gauge. you can't rock it in the bore like a dial bore gauge.
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#5
11-30-2010, 06:50 AM
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Quote:
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1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
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#6
11-30-2010, 09:08 AM
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Be careful of the standard $100 style dial bore gauge. The hard ball on the tip of the anvil and plunger is so small that it can scratch/dig through the soft bearing surface. This will give you a false diameter and therefore a false bearing clearance.
Preferred would be a dial bore gauge with a more gradual radius on the anvil and plunger and a lighter spring pressure behind the plunger. Unfortunately this winds up being alot more expensive.
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Brian Rock '65 GTO - Pump gas 496" IA2 w/ High Ports, 200-4R trans, 3.73 gears, 275 Hoosier radials, and 3925 lbs. 9.88 @ 134 N/A on Cali 91 octane. http://www.youtube.com/watch?v=NJEIY5OJ68g 
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#7
12-02-2010, 02:17 AM
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what he said. I bought a starret, which is the best I can afford. I think it was $300?. a local tool and die maker said he stopped selling dial bore gauges because he doesn't trust anything that costs less then 1500 bucks and not made in germany. gee thanks I said.
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#8
12-02-2010, 07:44 AM
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i ended up getting a fowler from enco, has not arrived yet but it was on the cheap end. i do however have a calibration lab here at work so i can have it checked for accuracy once it arrives. - RB
__________________
1970 gto (4spd) 462 500 hp [email protected] / 1.843 60'/ 3980 lbs 1964 corvette roadster 1968 corvette roadster 1962 corvette "equal rights, not equal things" if you want to know the future, read "atlas shrugged" I dont race a 4spd because it is easy, I race a 4spd because it is hard.
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