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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Exhaust: Headers, Muffler, Gaskets, Supports » Archive through September 19, 2006 » Will straight pipes hurt engine, lose power? « Previous Next »

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Rdes65
Posted on Tuesday, August 28, 2001 - 10:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anyone ever run straight pipes on a Buell?
I know it sounds good, sure there would be
a little loss of power, but what happens to
the engine if anything? I heard tale of
the motor running hotter and burning up pistons.
Any truth to this?
THANKS!!!
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Aaron
Posted on Tuesday, August 28, 2001 - 10:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anyone ever run straight pipes on a Buell?

Yes.

I know it sounds good, sure there would be
a little loss of power


Say what? Narrowing, yes. Loss, no.

but what happens to the engine if anything? I heard tale of the motor running hotter and burning up pistons. Any truth to this?

Unbaffled straight pipes tend to work good at one rpm, where the negative wave generated by the outlet hits the chamber. Get too far from that rpm and yes, I could see a positive pressure wave at overlap time instead, and you're right, that wouldn't be good.
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Craig2324
Posted on Tuesday, October 08, 2002 - 02:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I want to run a straight pipe on my 1999 X-1. It will be about the same length as the factory pipe. Any advise on what size pipe I should step it down to from the 2 1/2 in header pipe. I have the Power Commander, Race ECM, and a Modified Air Box w/K&N Filter. Any and all advise appreciated
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Aaron
Posted on Wednesday, October 09, 2002 - 09:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I dyno'ed an X1 last April that had a straight pipe replacing the stock muffler ...

Straight piped X1
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Craig2324
Posted on Wednesday, October 09, 2002 - 12:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What was the diameter of the pipe, length, and any modifications to the dyno'ed bike? Also, what was the reading with the stock muffler?
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Aaron
Posted on Wednesday, October 09, 2002 - 01:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This is just something that was rolled onto the dyno during a shootout. I don't have any details or before/after information.
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Doncasto
Posted on Wednesday, October 09, 2002 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The straight pipe on the above bike was a cobbed together muffler shop slip on built by the X-1s previous owner to satisfy his need for noise. It used the stock muffler angle from the header (2 1/2 inch) to just about the front of the engine where it then expanded to 4 inches. It carried that diameter to where it ended at about the back of the primary.
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Ccemn1
Posted on Thursday, March 16, 2006 - 05:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Clarkie, is that you???
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Jackbequick
Posted on Friday, March 17, 2006 - 12:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

For the "seat of the pants" perspective, the most noticeable thing will probably be be the torque loss in the lower to mid RPMs.

On a carburated engine you need to plan on having to work out the low speed and high speed jets needed. If the high speed jet is not rich enough you can experience over heating and sustained higher RPM can melt a hole in the piston.

I have no experience with the EFI engines but I assume that there is some avenue for getting the fuel/air mixture right.

Jack
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