Join Date: Sep 2003
Location: Newcastle NSW Australia
Re: CHI 218cc 3V heads the verdict (not Engine Masters)
Yeah, the cam kicks in at about 4500 & i've seen 7000, though it seemed a little strangled that high. The cam is advertised to be good from 4400 - 7200.
My heads are supposedly flowed for 640hp, but they make the compression 11.5:1 so it's no good on PULP. I have double head gaskets to drop comp to about 10.5:1 & IC&E regraphed the dizzy for this new comp. I feel that it could run more efficiently, though.
I'm also running a 750 vac/sec carby, & I've been told that it may be too big (?) & that I should probably run a 650 D/P.
It is a C6 auto with 2900rpm Eliminator convertor for drivability, as it is in a 2 tonne F100. I wouldn't really want to have a 4500rpm stally in it as it would be screaming it's nuts off everywhere. At the moment I am pulling 3200rpm at 120kph on the freeway & power is just a bang on the shifter away. I'm also running 3.5:1 gearing which I will be changing to 3.9:1 when I get a chance.
The only solutions I've come up with are:
(1) change the pistons to lower comp dish tops, put single head gaskets back in, change the cam & regraph the dizzy again for this, or
(2) try to open up the chambers in the heads a little more to lower the comp for PULP & maybe run a 2V Funellweb III intake manifold with dizzy regraph to suit, or
(3) CHI 3V's & a cam change.
Oh, maybe a 406ci stroker or a blower, but I'm not that rich.
I'm no mechanic & I'm learning more about what goes with what everyday. I was kind of lucky to get this engine with all the good stuff for the price, I just think that maybe it's not as practical as it should be & if i can make it better I will.
Go the F-Trucks