Does boring .060 make more HP than .030?
02-06-2005, 12:14 PM
#1
Racer
Thread Starter
Does boring .060 make more HP than .030?
I have a block that one cylinder has been bored .040 over and the rest are standard bore. Who knows why someone would do that. So I can either sleeve the one cylinder or take all cylinders to .060 over. Any suggestions or previous experience with .060 boring?
02-06-2005, 12:17 PM
#2
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You will gain very little additional cubic inches. Any HP gain between +30 and +60 is very negligable if at all.
02-06-2005, 12:23 PM
#4
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The volume swept by the piston during the intake cycle is larger with a .06 larger bore than .03 and so the volume of fuel/air is larger and contains more fuel energy so it should make more HP.
02-06-2005, 12:42 PM
#5
Racer
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So would the gain in HP, if it is minimal, be consumed by the energy it would take to move the larger pistions? In effect, cancelling any HP gain to do increased resistance? Deep Huh?
02-06-2005, 12:58 PM
#6
Burning Brakes
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Originally Posted by simon60
I have a block that one cylinder has been bored .040 over and the rest are standard bore. Who knows why someone would do that. So I can either sleeve the one cylinder or take all cylinders to .060 over. Any suggestions or previous experience with .060 boring?
02-06-2005, 03:14 PM
#8
Le Mans Master
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If it's a street motor, I wouldn't take it .060 over. I'd find a new block. One cylinder was probably especially bad(taper, out of round) and they took that one far enough to correct the problem. That is a lousy way to do things.
02-06-2005, 03:30 PM
#9
Melting Slicks
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St. Jude Donor '05
i would stick with the 30 i would never go over what is needed the gain isnt enough plus if it ever has to be bored again you can still take it to 60
02-06-2005, 04:55 PM
#10
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Originally Posted by 89sleeper
Boreing .060 over makes for thin cylinder walls witch makes for a hot running engine you may have heat problems!
Not true. Don't worry if you have to go .060" over. It only means the next time you break a ring, you'll be looking at a new block.
Larry
code5coupe
02-06-2005, 05:56 PM
#13
Team Owner
Originally Posted by simon60
I have to bore it .060. someone already bored the number 5 cylinder to .040. So It's either sleeve it back to .030 or bore it to .060
02-06-2005, 10:05 PM
#14
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Originally Posted by simon60
So would the gain in HP, if it is minimal, be consumed by the energy it would take to move the larger pistions? In effect, cancelling any HP gain to do increased resistance? Deep Huh?
3% more HP. 350 HP x 1.030225 = 360.57875 HP
Last edited by jfb; 02-06-2005 at 11:48 PM.
02-06-2005, 10:37 PM
#15
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St. Jude Donor '05
Have your machinist mic the walls to see how thick they are. Some blocks take .060 with no problem, some don't.
02-07-2005, 01:06 PM
#17
Le Mans Master
Personally 30 is as far as I would ever go. Yes, you would gain a few cubes, which equals HP, but I doubt you would be able to tell. And for
someone taking one cyclinder 40 over was the cheap way out. I'd go to another block, probably less money too. In the long run I think you'd be much better off. Good Luck.
someone taking one cyclinder 40 over was the cheap way out. I'd go to another block, probably less money too. In the long run I think you'd be much better off. Good Luck.
02-07-2005, 03:14 PM
#18
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Originally Posted by bogus
.060? that will directly lead to coolant seeping through the cylinder walls...
Larry
code5coupe
02-07-2005, 09:50 PM
#19
Racer
Thread Starter
The reason I was trying to keep this block is because it is a number match to the car. Do you guys think it matters for 95 hard top optioned, fx3, G92, sportseat, automatic car?? Does matching numbers even matter with C4s?
02-07-2005, 10:00 PM
#20
Race Director
Originally Posted by simon60
The reason I was trying to keep this block is because it is a number match to the car. Do you guys think it matters for 95 hard top optioned, fx3, G92, sportseat, automatic car?? Does matching numbers even matter with C4s?
I don't think GM put the VIN on the block.. I couldn't find the vin number on the block when I removed the motor.