skimming cast head for high CR

Timgsands

Timgsands

New Member
So the engine tweaking has begun.

Ordered the HIF44 adaptor kit from Tim Commer, along with an alloy tank and my other half being a mini mad lady has an RC40 up her sleeve.

I have the head off for a clean and polish and such, but wondered if there was an accepted safe amount to skim off to boost CR and get a bit more bang and squeeze going in my engine?

Someone said 2mm, but that seems like a flipping lot from the bit i know of heads!

Any info please?

Tim
 
The iron head engine is a low comp engine anyway but if you feel that's a bit too much go f0r 1.5, which is about 60 thou, you dont want to knock the bottom end out ;) I've never done it by the way but commeracer has
 
This might be a ridiculous question but what makes the low and high compression engines differ from each other? I thought it was just the head?
 
Both have dished Pistons, the Holbay had flat top. I haven't compared details but it's probably slightly longer stroke on on th hc engine.
 
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