Re: Will straight pipe hurt motors??

Posted by Steve Crum on October 14, 2005 at 06:07:20 from (4.156.231.254):

In Reply to: Will straight pipe hurt motors?? posted by logan on October 13, 2005 at 19:54:20:

I've built literally hundreds of these systems in as many configurations. In the process I've also busted a lot of myths. One of the most important considerations in and exhaust systen on a normally aspirated engine is out flow velocity. This often goes against the mind set of the bigger the system the better it will flow. Wrong!
An exhaust must be configured to maximize the scavenge effect on the cylinders so as one cylinder is not trying to "ram" it's exhaust charge into that of the previous cylinder whose charge has stalled in the manifold by restictive back pressure or by losing it's velocity in too large of a tube. Either way the engine's volumetric efficency suffers dearly and the engine's performance follow suit. As far as danger to valves, the most danger comes from a poorly planned system (or no system) that allows an inrush of cold air onto the valves at shutdown of the engine. Mechanically aspirated engines twist these rules all around, but the same basic principles apply.
This isn't rocket science, but is a little more complicated than it first appears.

Follow Ups:

• Re: Will straight pipe hurt motors?? txgrn 06:30:28 10/14/05 (2)
  • Re: Will straight pipe hurt motors?? Steve Crum 08:46:58 10/14/05 (1)
    • Re: Will straight pipe hurt motors?? txgrn 16:02:48 10/14/05 (0)

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