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Old 05-21-2009, 10:18 PM   #1
garcia_jean82
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Straight Pipe Question?

What are the benefits and faults of running a straight pipe on a ZX-6RR?
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Old 05-21-2009, 10:25 PM   #2
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If it's a straight pipe will it hurt the motor?
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Old 05-21-2009, 10:53 PM   #3
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will lose torque on the bottom end but gain some on the top end, i have 32,000 miles on my fz1 with a straight pipe and it hasn't missed a beat, just make sure you put something in the to create some sort of back pressure
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Old 05-21-2009, 11:16 PM   #4
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I was precisely reading about this morning. While I'm not certain it will hurt your engine a straight pipe will result in decreased longitudinal back pressure. Theoretically, an ideal straight pipe with no back pressure should result in increased horse power at the top end or at a specific and narrow rpm range due to a higher flow of exhaust gases. This is perfectly good if the engine is oriented towards racing. However, because most manufacturers strive to obtain and maximize power at a wide range while meeting the increasingly strict emissions standards they sacrifice top end power to obtain more usable low end.
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Old 05-22-2009, 05:25 AM   #5
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Benefits? None really.

Faults:

It is obnixiously loud, your friends wont want to ride with you, and your neighbors will hate you.
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Old 05-22-2009, 06:05 PM   #6
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Quote:
Originally Posted by garcia_jean82 View Post
If it's a straight pipe will it hurt the motor?
YES!! when u run a straight pipe its not going to do much damage to the engine, but over time it will. you will start to heat up the exhaust valves (warpage) moto gp racer bikes is diff. yes most will run a straight pipe, but the motor is not used to for more than 2-3races.
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Old 05-22-2009, 06:15 PM   #7
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ive heard of floating valves from no exhaust back pressure...

but ive built plenty of engines with straight headers....i have yet to have an owner come back with a warped valve...
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Old 05-22-2009, 06:26 PM   #8
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Originally Posted by tiatool View Post
Benefits? None really.

Faults:

It is obnixiously loud, your friends wont want to ride with you, and your neighbors will hate you.
+1, and everyone will know you have a small p****.
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Old 05-22-2009, 06:33 PM   #9
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no.....just no Sounds like looks like it must be
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Old 05-23-2009, 12:09 AM   #10
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Quote:
Originally Posted by jdm_phunk View Post
YES!! when u run a straight pipe its not going to do much damage to the engine, but over time it will. you will start to heat up the exhaust valves (warpage) moto gp racer bikes is diff. yes most will run a straight pipe, but the motor is not used to for more than 2-3races.
You are kind of right. They changed the rules in MGP this year that after race 7 (or somesuch I THINK Valencia) they are only allowed to use one motor, BUT I assume they can rebuild it. If you wish to use a new engine, you must start at the back of the grid or from pit lane.

It is supposed to be a cost cutting measure.
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Old 05-23-2009, 07:34 AM   #11
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plz dont.
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Old 05-23-2009, 08:01 AM   #12
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I second that, please don't.

If you look over at the AF-1 board for Aprilia's.

http://www.apriliaforum.com/forums/s...87119&page=206

Check post 3089 in this thread. Micah literally gets sick running bikes like this on the dyno and charges extra. The comments about people that run pipes like this may not be fair, but it is the perception.

Some earlier post he had talked about Busas with them and just how crappy it made them perform.

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