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  #16 (permalink)  
Old 11-30-2018, 09:40 AM
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Quote:
Originally Posted by ericnova72 View Post
You won't ever notice detonation on a engine run-in, there is no load on the engine.....for detonation to occur requires a load trying to slow the engine's acceleration.

At 10.3:1 comp, you probably better have at least 91 in the tank if you are going to use WOT at all.

It'll probably run on 87 in cool weather, and will if you never put your foot down hard.....so you could get home from a long drive on it just as long as you keep you foot off the floor while you've got the 87 in it.
I used 87 cause that's what I had at the house at the time. I will definatly run this motor at Wot after I break it in. This is strictly a play toy for me so if i need 93 I'll run it. This motor wont be ran everyday so it wont hurt the wallet.

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Old 12-31-2018, 05:28 PM
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If I changed my .015 steel head gasket to the stock fel pro .039 compressed gasket it would change my CR from 10.3 to 9.77. Would I be able to feel the difference in that. How much hp/tq would I loose.
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Old 12-31-2018, 07:57 PM
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Bad idea...even though you lower the compression ratio, you absolutely murder good quench, with the result being the thicker head gasket, 9.7:1 combination being even more octane sensitive and prone to detonation.

Sounds wrong to your brain cause you have lowered compression, but it has been proven many times that good quench outweighs the compression ratio change.

The only safe ways for you to lower compression are to grind the head chamber to a larger cc volume, or change to a dish piston.....never try to do it with a thick head gasket.
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