Re: Will straight pipe hurt motors??

Posted by txgrn on October 14, 2005 at 06:30:28 from (209.151.113.15):

In Reply to: Re: Will straight pipe hurt motors?? posted by Steve Crum on October 14, 2005 at 06:07:20:

What rpm's are your designs running? I can understand it in high rpm applications (where valves are airborne most of the time) or in the case of 2 cycle engines, tuned exhaust is paramount, but for a 2000 rpm 4 cycle farm diesel (where the valves are on the seat most of the time)? I agree with the restriction problem you mentioned, but not the stalling.

With my old 1 7/8 inch pipe, even at idle there was a steady flow of exhaust out the pipe. With the large pipe I can run to 2000 and still feel the pulsations (with my hand over the pipe) as each cylinder fires and dumps it's gas. Can't tell me that the former was better. Besides I get better performance and a cooler running engine which is why I changed in the first place.

Now if I were building 8000 rpm race cars I would go to California and talk to the Heddon or other knowledgeable folks about exhaust scavenging, headers, and the rest of the outflow system.

Mark

Follow Ups:

• 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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