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C/R piston choice

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Post  rmk57 on December 15th 2019, 4:32 pm

Is there a off the shelf piston for a 4.15 stroke, 75cc head that gives you a reasonable compression ratio, say 10.5-11.0? It seems they all have either a -3 flat top which puts you in race fuel zone or -28 dish which gets you around 9.8-10.0. Probe used to have a -15 which puts you in that sweet spot, but I dont see them available anymore.

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Post  Mark O'Neal on December 16th 2019, 1:11 am

-26.0 cc dish at zero deck and a .041 gasket (4.390 bore) with a 75cc head gives you 10.21:1.

Put the head back to 72cc and you're at 10.46:1

https://www.vigilanteparts.com/Probe_Forged_Pistons_p/8104-2-12332.htm

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Post  rmcomprandy on December 16th 2019, 1:30 am

Usually any piston manufacturer who offers a shelf-stock piston for the combination will make 1 dimensional change for not much extra money so, you can get whatever cc dish you want.
All it takes is a phone call.

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Post  Mark Miller on December 16th 2019, 11:13 pm

rmcomprandy wrote:Usually any piston manufacturer who offers a shelf-stock piston for the combination will make 1 dimensional change for not much extra money so, you can get whatever cc dish you want.
All it takes is a phone call.

I just want to say thanks Randy i'm sure that's something many people don't know including me very good info IMO!!Smile

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Post  Mark O'Neal on December 17th 2019, 2:24 am

They'll change bore, or C/H...sometihng like that. If you want to change rings or dish volumes it has to go through engineering.....that makes it a custom.

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