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Westfield XE exhaust manifold
Bingham - 31/1/15 at 05:31 PM

I'm pondering one of these but heard they were restrictive compared to expensive bespoke ones. Anybody know the diameter and length of the primaries? I wondered if I could have it converted to a 4-2-1 by cutting the collector off and added secondaries.

laptoprob - 1/2/15 at 09:20 AM

quote:
Originally posted by Bingham
I'm pondering one of these but heard they were restrictive compared to expensive bespoke ones. Anybody know the diameter and length of the primaries? I wondered if I could have it converted to a 4-2-1 by cutting the collector off and added secondaries.


I ran one in my Avon with a 225hp XE build and ran fine but i would say that it was at its limit. how much HP are you pushing through it?
I ended up taking it off in favour of a bespoke Tony Law exhaust which once fitted did allow the engine to rev better nearer the rev limiter.
Only reason i took it off though was because i was in the process of swapping to a 260hp engine so the Westy one had to go.

[Edited on 1/2/15 by laptoprob]

Bingham - 1/2/15 at 12:11 PM

Pretty standard really, skimmed coscast head, early type forged pistons with slight extra pocketing, Emen Z2 cams,vernier pulleys, Mecatrol 45mm bodies ( Argentinian Jenvey knock offs - about 60% cheaper), megasquirt. Hoping for 190-200 bhp but more importantly nice flat torque curve.

laptoprob - 1/2/15 at 01:17 PM

quote:
Originally posted by Bingham
Pretty standard really, skimmed coscast head, early type forged pistons with slight extra pocketing, Emen Z2 cams,vernier pulleys, Mecatrol 45mm bodies ( Argentinian Jenvey knock offs - about 60% cheaper), megasquirt. Hoping for 190-200 bhp but more importantly nice flat torque curve.


The manifold will be fine for that, no problem at all.

Mine was running 12:1 compression pistons and some fairly hot cams.