Skirrow
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| posted on 10/3/13 at 12:48 PM |
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Few questions about pinto bike carb manifolds
Just got some ZX9R bike carbs and thinking of having a go at making a manifold for a pinto myself. Just a have few questions for anyone in the
know.
1) The outlet on the carbs are about 40.5mm and I think the standard inlet ports on the head are about 38mm. So should the manifold tubing be tapered?
Are commercial manifolds tapered or is there a step where the wider tubing meets the head?
2) I have an injection head, so should the manifold match the egg shaped inlets or is it not important?
3) I notice that the commercial ones are welded at angled rather than having the tubes bent. Doesn't this harm flow? Am I better maybe using
straight tube and spacing the carbs.
4) More of an academic question now I have the carbs, but what's the point in having carbs any bigger than 38mm if the inlet is 38mm?
Doesn't that make the inlet the weakest link in the chain so the speak?
5) Am I worrying about air flow too much?
Cheers! 
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snapper
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| posted on 10/3/13 at 02:35 PM |
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Matching manifold to head helps the rest is academic
If it were me I would grind out the head to match the manifold, easier than tapering the tubes
Only grind a few mm in as Pinto ports are to big as standard
Don't worry about the injection cutaway
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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whitestu
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| posted on 10/3/13 at 03:23 PM |
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The alternative to a fabricated manifold is to respace the carbs and bolt Zx9 inlet rubbers straight up to a manifold plate.
Like this
 
manifold
Stu
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Skirrow
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| posted on 10/3/13 at 03:55 PM |
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Cheers fellas, I'm still trying to decide if I should space them or not. Which is generally considered easier? And are there any step by step
guides on re-spacing these particular carbs?
Found the answer by searching
http://www.locostbuilders.co.uk/viewthread.php?tid=117413
[Edited on 10/3/13 by Skirrow]
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