[Fot] Intake Manifold Crossover

[Bill Babcock]

Actually, you see them on a lot of cars. They don't really help flow  
much, especially coming in at a right angle as they often do. The  
moderate pulses in the intake system by creating a larger air volume  
downstream of the butterfly or CV piston. At least that's the reason  
given for why they ware added to manifolds to begin with. Most early  
intake manifolds look like the pattern for the castings was made from  
plumbing bits. Perhaps they were. They flow as badly as they look. A  
stock Triumph intake manifold flows about half as much as a similarly  
sized modern one.

Bill Babcock
billb at bnj.com
bnj  Website for Babcock & Jenkins, a direct and interactive agency

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On May 5, 2007, at 11:48 AM, SHANE Ingate wrote:

> I don't know anything about this, but intuitvely, if it
> was important, I would think that we would have seen
> x-overs on ALL intake manifolds through the demise of
> carbs.
>
> Shane Ingate, what the $%#@ do I know, in Md
>
>> I have been debating the merits of blocking off the cross over  
>> tube in my
>> TR4
>> intake manifold.  I have read that the tubes create turbulance and  
>> should
>> be
>> blocked off.  Reading it and practical application, however, are 2
>> different
>> things.   I have also heard of some MG racers blocking them off,  
>> but that
>> still does not make it right.  Have any of you Listers tried  
>> this?  Any
>> dyno
>> testing to determine if it is worth while?
>> Joe(B)
>
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