Duratec 25

[Hanns Per]

The point at the Raceco exhaust system is interesting

 

I could go for big valves, ported head and the exhaust system

 

could this alone be a significant step over the Caterham 260 specs?

 

Rgds

Hanns Per

 

 

[dannylt]

For power, yes. In torque below 5k, unlikely. Surely the 260 spec head is already somewhat ported.

[Alaskossie]

dannylt,

 

what transmission did you use to harness that 308 hp and 225 lb.ft of torque from the 2445cc Duratec?

 

I take it that you are not using that engine now?? --if that's correct, why not?

 

Alaskossie

[dannylt]

Gearbox was/is a straight cut T9 dog box.

 

Overboring to 89mm is much cheaper, simpler and more reliable than "turning the Duratec into a big K-Series with incorrectly supported liners" as Ammo put it 😬. The heads can breathe so well the power is still climbing at a sensible rev limit, so we decided to de-stroke it to get more rpm instead. The first engine was a development experiment, and I think Ammo has sold quite a few of the 2.2 kits now. I think it's a perfect compromise if you still want 200lbft, but no doubt the 2.0 way is cheaper if you just want power! There was a 300+ bhp 2.3 engine too that we dyno tested for interest while waiting for the 2.2 steel crank. That was enough playing for me; I'm sticking to what I have now!

 

danny