Optimal exhaust manifold/pipe bore for 1800 ss K series?

[Englishmaninwales]

As the subject, 2" or 3" or what? (with a 4:2:1 manifold)

 

Thanks

 

Malcolm

[Shaun_E]

There are recommendations on Dave Andrews' K series engine page although there may be more recent experiences available.

Rolling road tests have shown that the best configuration for the 1.6/1.8K series is a 4-2-1 manifold with 30-32 inch primaries of 1.5inch diamter and 10-12 inch secondaries of 1.75 inch diameter culminating in a 2.25 inch system, this setup brings large gains in the low and mid range torque without affecting top end power.

The Caterham VHPD 4-2-1 system is pretty close to these I think and works very well on my set-up.

 

Yellow SL #32

 

Edited by - Shaun_E on 24 Apr 2007 15:12:01

[Mark Durrant]

Malcolm

 

I would fit either the standard SLR system or get one made to Dave Andrews spec as both are known to work with the map in mems ECU.

 

Mark D

Comp Sec

 

[tricky dicky]

Malcolm, YHM,

Regards,

Richard