Fron (or rear) facing plenum

chodjinn · Post by **chodjinn** » Mon Feb 26, 2007 1:16 pm

I know this has come up before but I can't find it using the search (bit impatient today!).

Where could I get one of those front or rear-facing plenums, like the westfields use?

I may have to bin the original plenum as a) its too high) and b) it gets in the way of the nearside rocker breather connection (as in i can't fit it at all!)

oh yeah, and that custom swirl pot thing is a bloody nightmare to sort so I'm binning it totally!

kiwicar · Post by **kiwicar** » Mon Feb 26, 2007 1:40 pm

Is it not easier to move the rocker breather? and cut down the existing plenum a bit? (I am sure I have seen that thread on the old forum) Just the front to rear plenums all seem to be made of carbon fiber and as a result cost a fortune.
Don't know about the custom swirl pot thingy.
Best of luck
Mike

bill shurvinton · Post by **bill shurvinton** » Mon Feb 26, 2007 2:27 pm

The westfield plenums are made by ACT

chodjinn · Post by **chodjinn** » Tue Feb 27, 2007 11:02 am

Not the carbon fibre ones, they're just bling, the cut-and-shut jobbies?

I want to use DJE large rockers, which have the breather connection in the middle, right under the throttle . . .

Lewis · Post by **Lewis** » Tue Feb 27, 2007 12:54 pm

I'm sure with some tubing and two old plenums you could cut-and-shut them into quite a neat front-facing arrangement. A possible solution? Sure it wouldn't cost much for someone to separate and re-weld them

chodjinn · Post by **chodjinn** » Tue Feb 27, 2007 1:22 pm

yeah that's all westfield do, but I have absolutely no fabrication/welding skill and wouldn't want to try at the moment, especially with aluminium. PLus I don't nkow anyone who could do it for me.

I've just tried westfield but no-one was available to help, I just want to know hoe much the factory ones are.

ACT just quoted me nearly 400 smackers for a carbon plenum and throttle body. £275 for just the carbon bit.

Eliot · Post by **Eliot** » Tue Feb 27, 2007 1:30 pm

The factory westfield plenum is several hundred pounds. We got lucky and bought one from V8 Developments that he had on the shelf. (that was removed for a carbon one)

Photo's of the actual westfield one being built at the factory are on my site:
http://mez.co.uk/westfield/

problem is that you would still have a 65mm throttle - might be easier to weld a plate on the end and fit a 70+ mm throttle on it.

chodjinn · Post by **chodjinn** » Tue Feb 27, 2007 2:32 pm

hmmm cheers for the link forgot you had all that on your site.

Ok, functional question now; how does a front facing plenum compare to the standard one, in terms of air flow etc? . . . remember I have twin turbos so will that affect things?

Off topic slightly; the guy at ACT told me Prism have just fitted one of their carbon plenums to that mental twin turbo Griffiths they have . . . puts out circa 700lb/ft so I'm told from a V8D 5.3litre

Eliot · Post by **Eliot** » Tue Feb 27, 2007 3:15 pm

The westfield design was approved by rover, they (rover) insisted that a divider plate was fitted internally to allow the air to flow to the back of the plenum.

To me (and others) it looked like more of a restriction and i removed it. I also shortened the trumpets (not an issue in your case!).

I would weld a 10mm plate on the front and bolt a throttle body on it.

chodjinn · Post by **chodjinn** » Tue Feb 27, 2007 4:13 pm

Cool, is the trumpet length not important with forced induction then?

Will have a think and see what turns up r.e. cut and shut.

thanks for the advice

Eliot · Post by **Eliot** » Tue Feb 27, 2007 4:56 pm

chodjinn wrote:Cool, is the trumpet length not important with forced induction then?

Will have a think and see what turns up r.e. cut and shut.

thanks for the advice

I said that because i assume you are using the plastic bellmouthed inlet i made you.

chodjinn · Post by **chodjinn** » Wed Feb 28, 2007 8:16 am

eliot what are you talking about?!?! lol!!!!

I WISH you had made me one of those plastic inlets!! Infact I would pay good money for one!

hearbear · Post by **hearbear** » Wed Feb 28, 2007 9:13 pm

Check out the end of this post on locostbuilders forum

http://www.locostbuilders.co.uk/viewthr ... ?tid=61264

He is selling a plenum with an end entry

Cheers George

Eliot · Post by **Eliot** » Wed Feb 28, 2007 10:21 pm

chodjinn wrote:eliot what are you talking about?!?! lol!!!!

I WISH you had made me one of those plastic inlets!! Infact I would pay good money for one!

Sorry

I got you confused with Wotland! (why cant people have normal names?)

I do want to make another one but actually perform a back to back dyno test to see if it actually works.

there's the taraka version on ebay now, i prefer my version if i'm honest.
http://cgi.ebay.co.uk/Rover-V8-TVR-Tari ... dZViewItem

chodjinn · Post by **chodjinn** » Thu Mar 01, 2007 8:18 am

for some reason I can't regiser on that westfield site so I can't email the guy! Taht would be bloody perfect!

And eliot, I'll be first in the queue if you do want to make another!