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Tractor Pulling Discussion Forum

Re: Farmall H pistons

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north puller

02-11-2013 14:55:38
68.171.231.87



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I would not mill the head like that. You are considerably weakening the head by doing so, and it will be more prone to cracking.

If you are looking for more compression than an off the shelf piston has to offer, then look to the custom builders. For a little more money, you will have a much better product.

Carb and cam have to work together based on your intended RPM.




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48farmallH

02-11-2013 19:31:33
206.53.196.77



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 Re: Farmall H pistons in reply to north puller, 02-11-2013 14:55:38  
Thank you north puller, is there an exceptable amount to mill or just leave the head alone and take care of compression with pistons and stroke? I spoke with a couple engine builders today about pistons but neither could give a number on compression even with the head casting numbers.



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north puller

02-12-2013 03:30:44
68.171.231.80



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 Re: Farmall H pistons in reply to 48farmallH, 02-11-2013 19:31:33  
I think that with a smaller engine you could get away with 9:1 compression on 93 octane pump gas. Unless you have a LP head, you arnt going to get that compression with off the shelf pistons.

If you're going to get custom pistons then there's no reason to mill the head any more than necessary to get it flat.

Milling the head will not gain you much, and with an off the shelf piston, it might be the difference between 7 and 7.5 compression. Cam timming will show more of a difference on a compression tester.

As far as off the shelf pistons go, I really have no idea which ones are the best.

For custom, have you tried the Farmall builders? I think that Baker or Lemmons should be able to build pistons based on your head casting number. They should know the cc's already.

I don't know for sure, but I think that ALL the custom builders use Arias or Ross for smaller pistons like that. Difference is that the farmall guys should already know how big of a bump to put on top.

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