Re: Will straight pipe hurt motors??

Posted by Steve Crum on October 14, 2005 at 08:46:58 from (4.156.228.173):

In Reply to: Re: Will straight pipe hurt motors?? posted by txgrn on October 14, 2005 at 06:30:28:

When you state a 1 7/8" pipe I'm assuming you are refering to a B or similar sized 2 cylinder tractor. The 'pulsation' you mention is indictive of respectable scavenging as long as the duration of the low pressure side of the pulse is not in the negative side of the pressure wave. Flow tests on my own stock B demonstrated that a 1 7/8" stock sized tube although flowing respectably still maintained a degree of steady back pressure at the exhaust ports, and a oversized 2 1/2" tube tested excessive backflow or reversion at the ports. Both these conditions tend to promote "flow stalling" or lost velocity of the outflow of exhaust gases from the cylinder thus screwing volumetric efficency, driving up engine temperature, and driving down potential power. The best flowing tube I've tested on one of these B sized engines that seems to strike a balance between too much and not enough is 2.0".
Quite frankly put, if you cannot get as much of the burn't gases out of the cylinder as possable in the split second it has to do so, the incoming charge of fresh air/fuel cannot be so fast incoming in it's own split second.
Picture yourself walking out of an auditorium into a crowded foyer, you can move but not real fast, but if people are moving out thru the foyer in an orderly fashion you move right along. If the foyer is empty, people tend to slow down in their pace.
I won't even pull out my notebook on cam timing and overlaps or intake designs. But I have quite a list of customers that wanted their pipes painted black so as not to draw too much attention to them. (pullers are just as secretive as NASCAR in what they do to their machines.)

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• Re: Will straight pipe hurt motors?? txgrn 16:02:48 10/14/05 (0)

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