I think i might be crazy

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Russ Pottenger
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Re: I think i might be crazy

Post by Russ Pottenger »

jason_alex_2009 wrote:Thats showing 26cc dished pistons but if you open up the combustion chamber should be the done by a machine shop or just very slow and re cc every few mins to make a smooth combustion chamber?
Dino is giving specs on a proposed build sheet based off of a 26cc piston.
Your piston dish volume can change accordingly to your finished combustion chamber.

It's best to know what your cylinder head combustion chamber volume will be before you order your pistons.

Remember when you're trying to hit your desired static compression ratio the engine doesn't know if the volume is in the cylinder head or the dish and the piston.

Hope that helps
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Re: I think i might be crazy

Post by Cheromaniac »

Russ Pottenger wrote:
jason_alex_2009 wrote:Thats showing 26cc dished pistons but if you open up the combustion chamber should be the done by a machine shop or just very slow and re cc every few mins to make a smooth combustion chamber?
Dino is giving specs on a proposed build sheet based off of a 26cc piston.
Your piston dish volume can change accordingly to your finished combustion chamber.

It's best to know what your cylinder head combustion chamber volume will be before you order your pistons.
Exactly. To achieve the 9.25: SCR of my proposed build, you just need the sum of the combustion chamber volume and the piston dish volume to be 83cc.
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jason_alex_2009
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Re: I think i might be crazy

Post by jason_alex_2009 »

so its about a tight quench is the any worry if i get to 9.25 static with a stock cam on pinging on 87?
Russ Pottenger
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Re: I think i might be crazy

Post by Russ Pottenger »

jason_alex_2009 wrote:so its about a tight quench is the any worry if i get to 9.25 static with a stock cam on pinging on 87?
.035 to .043 piston to head will be real safe at 9.25:1
My engines running Comps 68-232-4 will run all day long on 87 at 9.5:1
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