Originally posted by TK
Yep, modern multi-valve heads flow heaps better than the old V8 stuff, particually at low lift, I've done WRX heads that flow over 300cfm at only .4" lift.
You've just gotta be careful not to fuck up the low lift flow in the chase for max lift cfm.
Who tested em at 25"?, that an odd pressure drop to use, I though only the yanks tested at 25"
The usual is 10" if you've only got a little flow bench or 28" for a bench that can pull that much.
Post your flows for the 7afe (if it won't compromise any advantage you may have in competition), if I get the opportunity I'll see if I can't beat it
I've always thought the FE style heads (3sfe, 4afe etc) had a good port design, but no-one seems to play with them so I've never had the opportunity to see what they can do, by comparison (from my dodgy memory) the 4age ports were somewhat smaller & sharper on the short turns.
Cheers
TK
You've just gotta be careful not to fuck up the low lift flow in the chase for max lift cfm.
Who tested em at 25"?, that an odd pressure drop to use, I though only the yanks tested at 25"
The usual is 10" if you've only got a little flow bench or 28" for a bench that can pull that much.
Post your flows for the 7afe (if it won't compromise any advantage you may have in competition), if I get the opportunity I'll see if I can't beat it
I've always thought the FE style heads (3sfe, 4afe etc) had a good port design, but no-one seems to play with them so I've never had the opportunity to see what they can do, by comparison (from my dodgy memory) the 4age ports were somewhat smaller & sharper on the short turns.
Cheers
TK
Anyway, this is what I'm expecting from the new head, also at 25" ->
Inlet -
0.1 - 96
0.2 - 164
0.3 - 200
0.35 - 211
0.4 - 220
0.45 - 224
Exhaust -
0.1 - 89
0.2 - 151
0.3 - 163
0.35 - 168
0.4 - 170
0.45 - 171
It's yet to be tested, but I'm confident it'll get there.
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