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#1
03-21-2024, 07:55 AM
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Zero or -.005
I always thought a true .000 deck height with a .040 head gasket was good practice for an efficient engine. My machinist recommends -.005 says zero with a .040 gasket is too close. I am using 6.8 Eagle rods and a 4.25 Scat forged crank and E-heads. I mocked it up yesterday with pistons in four corners and it's currently -.012, -.014, -014, -.015. What is your experience. Thanks.
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Tim Corcoran Last edited by Tim Corcoran; 03-21-2024 at 08:04 AM. |
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#2
03-21-2024, 08:19 AM
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We shoot for zero to .005 above the deck for a factory block build. Never had an issue.
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#3
03-21-2024, 10:21 AM
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Quote:
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Tim Corcoran |
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#4
03-21-2024, 11:46 AM
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Quote:
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#5
03-21-2024, 04:25 PM
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I went with zero and 1016s and all is good.
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#6
03-21-2024, 04:45 PM
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Getting to zero or better yet plus .005” gets more of the fuel out of narrow piston to bore gap and where it should be, in the chamber to be burned and not wash the lube oil out of the top of the bore over time.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#7
03-21-2024, 09:28 PM
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My machinist told me his recommended minimum is .050 and he said I should put them -.005. I told him to put them at .000 and he said OK. So I just wanted to confirm what I thought I already knew. Thanks for the confirmation. .000 deck will give me 13:1 and that is what I was shooting for. I had him mill .050 off of my heads and got the chambers down to 61cc's.
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Tim Corcoran |
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#8
03-22-2024, 10:01 AM
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https://www.enginelabs.com/engine-te...n%20the%20bore.
Thought this might be helpful. I would following your machinist recommmendations. |
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#9
03-22-2024, 10:05 AM
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I m actually .010 out with .060 head gasket on a factory block, running BME alum. rods, N/A motor, lol. No issues.
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#10
03-26-2024, 12:14 AM
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Quote:
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion 
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#11
03-26-2024, 01:28 PM
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I have steel rods and Butler/Ross flat top pistons
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Tim Corcoran |
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#12
03-26-2024, 03:12 PM
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I agree with PK and Steve 25. I shoot for .030" piston to head clearance.
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#13
03-27-2024, 01:50 PM
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When Jon Kaase built his Engine Masters engine(s) he went .035 quench.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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