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Author Topic: EVO Combustion Chamber mods  (Read 1668 times)

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MCE Performance

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EVO Combustion Chamber mods
« on: June 13, 2018, 02:16:43 PM »

Has anyone tried moving the chamber wall away from the Intake valve on that "flat" portion?

Any EVO experts care to weigh in on this?
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johnsachs

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Re: EVO Combustion Chamber mods
« Reply #1 on: June 13, 2018, 06:52:58 PM »

Marked improvement depends on valve size. I always move a small amount of wall on the exhaust side, as the wall is closest there.  ;)
John
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MCE Performance

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Re: EVO Combustion Chamber mods
« Reply #2 on: June 13, 2018, 07:21:46 PM »

Marked improvement depends on valve size. I always move a small amount of wall on the exhaust side, as the wall is closest there.  ;)
John

Thanks John, The intake was pretty close at 1.9, I took a little out but I didn't see any
gains. (I probably didn't take enough out) Just curious b/c they flowed a little less than
I expected (like 10 less).
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prodrag1320

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Re: EVO Combustion Chamber mods
« Reply #3 on: June 21, 2018, 06:54:36 AM »

I also un shroud the wall on EVO heads,especialy when bigger valves are used
 

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