benje2
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| posted on 27/8/10 at 02:06 PM |
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Zetec Black top Vs silver top manifold
Hello Everyone,
Excellent site here and a wealth of useful information! I'm currently undertaking a Crossflow to an 1800 Zetec conversion, and I was looking at
using the Crossflow carbs (2 x 40DCOE)
However whenever I see Zetec manifolds, they all appear to be for the silver top, the black top port shape is oval with a little cutout at the top
where the injector would fire in its original installation. Blacktops are completely oval.
Is there any issue with using the silver top manifolds? I assume it will mean there is a little pocket of space where the manifold meets the head?
Does this have any adverse effects at all? Reduced power etc?
Thanks all in advance
Ben
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Mal
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| posted on 27/8/10 at 02:27 PM |
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I don't know the answer to your question, but if you look on the website of companies like Dunnell Engines or Borton Power you will be able to
see if they list different inlet manifolds for the silver and blacktop versions.
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coozer
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| posted on 27/8/10 at 02:32 PM |
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Are you sure? My 2003 blacktop has the injector cut outs the same as the 1.8 silvertop I had in before hand.
1972 V8 Jago
1980 Z750
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big_wasa
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| posted on 27/8/10 at 03:25 PM |
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As^^ your man says ive never seen a black top or a silver top engine with oval inlet ports without the injector cut out.
I think you mean the manifold only has an oval port and no ingector cut out ?
Thats how they all are, weber to jenvey, silver and black top all the manifolds are just oval.
As to if it reduces power, must do but as a ported 2.0 with cams will do 220bhp + no ones seems to bother.
On the other hand you will have issues with the progression drillings running the 40's on a 16v engine
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benje2
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| posted on 27/8/10 at 05:14 PM |
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Thanks gents, for some unknown reason I had it in my head that blacktops only had oval ports with no injector cutout!
Thanks again
Ben
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stevebubs
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| posted on 27/8/10 at 08:04 PM |
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My blacktop has had a standard silvertop manifold fitted for nearly 6 years now without issue...
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FazerBob
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| posted on 27/8/10 at 09:48 PM |
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I took my home made manifold and bike carbs straight off my silvertop and bolted them to my blacktop. no issues at all. Straight swap.
Bob
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benje2
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| posted on 28/8/10 at 12:20 PM |
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Cheers Gents,
Do you have any recommendations for a Twin 40 DCOE manifold? I've seen some on eBay for £80 which seemed incredibly cheap!
Thanks
Ben
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