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CVO Technical => EVO => Topic started by: MCE on June 13, 2018, 02:16:43 PM

Title: EVO Combustion Chamber mods
Post by: MCE 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?

Title: Re: EVO Combustion Chamber mods
Post by: johnsachs 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

Title: Re: EVO Combustion Chamber mods
Post by: MCE on June 13, 2018, 07:21:46 PM

Quote from: johnsachs 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

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).

Title: Re: EVO Combustion Chamber mods
Post by: prodrag1320 on June 21, 2018, 06:54:36 AM

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