with the exception that WILL NOT help me in ANY way on what Im trying to do. I have 61cc heads now and I need LESS...

he didnt even read my question really and just started firing off. I need more compression. I dont care about that now

The question at hand now is what do I do to my 862 heads at a machine shop to get the 10.5:1 or 11:1 CR I want?

 

I think you had asked me about the patriot ported heads and I posted the info as seen. I then told you it was too much and that I thought it would be better for you to run your current heads with some port work, milled, and a thinner head gasket to optimize your quench.

I am trying to help you. Plain and simple. for every .003 you mill you take away 1 cc of combustion chamber size. For every .007 you mill, you will raise your compression a tenth of a point. I don't think you're going to be able to attain 11:1 compression without A LOT of work.

 

Thanks for all the help u've given me... how does milling away .003 lose a compression point however .007 being milled raises it a tenth of a compression point?


Can anyone tell me what to do to my 862 heads to get me somewhere around 10.5:1 compression ratio?? Thank u..

 

Think about what you just typed........ the more cc's you lose the higher your compression will be. What I stated is for every .003 you mill of the heads (shave down) the combustion chamber gets smaller by 1 cc. That equates to a gain in compression. Is this hard to follow?

 

To the OP: Any more silliness will result in this thread being closed.

I see several answers to your questions in this thread. Many good recommendations and much good information. Perhaps a reread is in order, and perhaps you can explain to us why these perfectly good recommendations don't meet your needs.

An easy answer to matching the specs of WCCH heads would be to call Richard@WCCH and have him do the head work on your heads. Problem solved. He can also very likely give you the exact specs of your heads, and if he can't, he has the ability to determine them for you at his shop.

Other than that, Hirdlej has given you the information about milling. Your machine shop can tell you whether or not they can mill your heads far enough to accomplish what you want.

Nightrunner gave you excellent advice: leave the heads alone and control your CR with your piston, head gasket, and rod specs (this is generally my advice -- milling the heads of course works, but limits what you can do with the heads from then on).

 

I've looked all over google images and can't find any pictorial of a compression ratio explanation. I looked for something I could show my 8 year old sister and have her come away with a full understanding of what the ratio means and how to obtain it...I didn't find anything that elementary so just find a good definition and learn what it is.

 

edit by TB: Some people never learn.
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Nightrunner did give me another avenue, thank u, I may take it, its food for thought.

 

Let's just close this thread, he's never gonna get it.

And if you're going to quote somebody, do it right.

 

YES. Now you are catching on. And by repeating what I cleaned out of your thread and gave you an infraction for, you also get a little vacation.


And, as I promised, now this thread is closed.