Largest valve size with C9VE head
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dfree383
Maddmattmustangs
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Largest valve size with C9VE head
What's the largest intake I can use with a 1.8 exhaust valve?
Maddmattmustangs- Posts : 1201
Join date : 2010-02-15
Age : 34
Location : Berryville, Arkansas
Re: Largest valve size with C9VE head
2.19 is about it. IMO your better off with a 2.25 1.76 combo.
dfree383- BBF CONTRIBUTOR
- Posts : 14847
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: Largest valve size with C9VE head
Why is that Dave? Can you please explain
lghting94- Posts : 762
Join date : 2008-12-16
Location : Vine Grove Kentucky
Re: Largest valve size with C9VE head
with the 1.80 exhaust valve you run out of room and IMO it gets a little tight. A Good rule of thumb is 4" of valve with a stock placement head. 2.25 + 1.76 = 4.01, 1.80 + 2.19 = 3.99
Intake Flow = HP and the exhaust can be compensated for with proper cam timing. You need to get it in before you worry about getting it out.......
Intake Flow = HP and the exhaust can be compensated for with proper cam timing. You need to get it in before you worry about getting it out.......
dfree383- BBF CONTRIBUTOR
- Posts : 14847
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: Largest valve size with C9VE head
Maddmattmustangs wrote:What's the largest intake I can use with a 1.8 exhaust valve?
In a C8, C9 or D0 head the 2.200" FRPP intake valve #M-6507-B429 seems to work the best in that combination with the 1.800" exhaust valve.
Personally I like the 2.300" intake and 1.710" exhaust valve but, most pistons aren't notched large enough for that intake valve size.
Re: Largest valve size with C9VE head
[quote="rmcomprandy"]
Why do you like that combo though? Better power output up top?
Maddmattmustangs wrote:What's the largest intake I can use with a 1.8 exhaust valve?[/quote
In a C8, C9 or D0 head the 2.200" FRPP intake valve #M-6507-B429 seems to work the best in that combination with the 1.800" exhaust valve.
Personally I like the 2.300" intake and 1.710" exhaust valve but, most pistons aren't notched large enough for that intake valve size.
Why do you like that combo though? Better power output up top?
Maddmattmustangs- Posts : 1201
Join date : 2010-02-15
Age : 34
Location : Berryville, Arkansas
Re: Largest valve size with C9VE head
When you cam for it ... yes. And, if you're talking WOT power, it's better everywhere, not just on the top.
Re: Largest valve size with C9VE head
Do I need to cut the chamber for the 2.3 valve? If not I may just do that then
Maddmattmustangs- Posts : 1201
Join date : 2010-02-15
Age : 34
Location : Berryville, Arkansas
Re: Largest valve size with C9VE head
Maddmattmustangs wrote:Do I need to cut the chamber for the 2.3 valve? If not I may just do that then
You will probably need to relieve the piston notch if it is not a custom. 2.280" is about all that will fit radially into a normal CJ intake notch.
Re: Largest valve size with C9VE head
rmcomprandy wrote:Maddmattmustangs wrote:Do I need to cut the chamber for the 2.3 valve? If not I may just do that then
You will probably need to relieve the piston notch if it is not a custom. 2.280" is about all that will fit radially into a normal CJ intake notch.
I can do that it wouldn't be to big of a deal.
Maddmattmustangs- Posts : 1201
Join date : 2010-02-15
Age : 34
Location : Berryville, Arkansas
Re: Largest valve size with C9VE head
2.25 and 1.75 is what I have on my C9 heads.
1Bad91- Posts : 267
Join date : 2010-05-02
Age : 43
Location : Va Beach
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