adrianreeve
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| posted on 3/7/10 at 04:05 PM |
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Zetec Exhaust Manifold - opinions please?
What do we think of this Zetec exhaust manifold? Reckon it could be adapted for use in a Haynes Roadster, and if so, would it be too restrictive?
Mine's a 2l silvertop with 36mm bike throttle bodies and megasquirt.
All comments welcomed, it's waaaay cheaper than a custom manifold!!!
Cheers
Adrian
http://cgi.ebay.co.uk/GENUINE-FORD-FOCUS-2-0-16-ZETEC-EXHAUST-MANIFOLD-NEW-/400086676421?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&has
h=item5d270633c5
[Edited on 3/7/10 by adrianreeve]
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Paul TigerB6
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| posted on 3/7/10 at 04:13 PM |
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I'd say go for a proper tubular manifold myself. The extra cost will be the cheapest gain in additional power you'll see I recon.
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cliftyhanger
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| posted on 3/7/10 at 04:18 PM |
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It will be restrictive compared to a well designed and made 4>1 with longer primaries, but I have never seen back to back testing (in fact if
anybody knows of any with real figures, same car, same RR etc etc)
However, as it seems a better design than the mondo cast manifold, and has probably had more money spent developing it than any aftermarket manifold,
it is probably not bad at all for 130-150bhp. I would guess it is aimed at making the factory car economical and good to drive as opposed to max
power.
For a "better" factory manifold how about a ST170 one?? that is a work of art and I doubt many aftermarket ones could match it. Just not
the most convenient layout.
(good) manifold design takes rather more brainpower and research than most things on cars. I would use that manifold. Certainly over one that is just
designed to "fit and looks right"
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r1_pete
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| posted on 3/7/10 at 04:36 PM |
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That would probably be too close to your bonnet when fitted.
I.M.O. all that is fit for is cutting the pipes off and using the flange for a proper exhaust.
Thats what I did on my last project:
 
Rescued attachment Mani4.jpg
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scutter
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| posted on 3/7/10 at 04:51 PM |
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If your not getting a custom tubular manifold, then keep an eye out for a ST170 manifold, much better than standard as said.
ATB Dan.
The less I worked, the more i liked it.
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cliftyhanger
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| posted on 3/7/10 at 05:20 PM |
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quote:
Originally posted by r1_pete
That would probably be too close to your bonnet when fitted.
I.M.O. all that is fit for is cutting the pipes off and using the flange for a proper exhaust.
Thats what I did on my last project:
But why is your design better (in terms of extraction and power/torque. The clearance is a different matter!)
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big_wasa
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| posted on 3/7/10 at 05:26 PM |
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I would only use that if on a VERY VERY tight budget.
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r1_pete
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| posted on 3/7/10 at 05:33 PM |
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quote:
Originally posted by cliftyhanger
quote:
Originally posted by r1_pete
That would probably be too close to your bonnet when fitted.
I.M.O. all that is fit for is cutting the pipes off and using the flange for a proper exhaust.
Thats what I did on my last project:
But why is your design better (in terms of extraction and power/torque. The clearance is a different matter!)
Equal length headers, it fitted my install, thats all, whether it was any better in terms of performance is a complete unknown.
My main point is that type of manifold would probably take intense heat too close to the bonnet in a 7.
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cliftyhanger
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| posted on 4/7/10 at 06:31 AM |
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r1, that is fair reply. 
So, has anybody got any actual comparisons? Mr Wasa, why only if on a tight budget? The ford item looks to have pretty much equal length headers,
although they are not very long, but they are probably similar to the primaries in the homemade one....
Maybe one of the tuning companies has some data, will have a search....
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