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post #1 of 10 (permalink) Old Sep 5th, 2008, 2:51 pm Thread Starter
 
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Exhaust repack question

I just repacked my exhaust with repack fiberglass that I bought from a bike shop. Th exhaust is a Ztechnik 4020. Can anyone tell me if I was suppose to wrap it in steel wool first? Some brands that I have seen on the net have steel wool wrap and then the fiberglass, but the Ztechnik refill (that I did not buy) does not. I also was not sure if I was suppose to tightly wrap the inner pipe or loosely wrap it. I loosely wrapped it and am not sure if it sounds right.

Thanks
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post #2 of 10 (permalink) Old Sep 6th, 2008, 6:05 am
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Here's a nice write up. Looks like they wrap with steel wool before fiberglass packing.
Linky

Another one:

I have a ZTechnick also which will need it soon.


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post #3 of 10 (permalink) Old Sep 6th, 2008, 9:56 am Thread Starter
 
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thanks. reason why i asked was because the Ztech kit does not come with steel wool.
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post #4 of 10 (permalink) Old Sep 6th, 2008, 3:55 pm
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steel wool

Previous bike I had to keep repacking with steel wool. The manafacturer finally decided that the steel wool could not cope with a K motor. He stopped using it.

The BM technicians warned me that spitting out steel wool was going to confuse the computer and I could expect piston trouble.

My current bike is stock standard, works okay.
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post #5 of 10 (permalink) Old Sep 7th, 2008, 8:02 am
 
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Quote:
Originally Posted by Papilio
Previous bike I had to keep repacking with steel wool. The manafacturer finally decided that the steel wool could not cope with a K motor. He stopped using it.

The BM technicians warned me that spitting out steel wool was going to confuse the computer and I could expect piston trouble.

My current bike is stock standard, works okay.
Have things changed so much that we now have sensors in the mufflers?
The final sensor should be somewhere in the header or exhaust pipe just before the muffler , no??
Please forgive me if i'm not with it , i just haven't been around for awhile.
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post #6 of 10 (permalink) Old Sep 7th, 2008, 8:51 am Thread Starter
 
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are you on the right thread? just checking. I wasn't sure what you were referring to since the topic is different from what you are talking about.
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post #7 of 10 (permalink) Old Sep 7th, 2008, 10:32 am
 
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Quote:
Originally Posted by rjoelshipp
are you on the right thread? just checking. I wasn't sure what you were referring to since the topic is different from what you are talking about.
Joel - Look At Papllo's Comment About Computer Concerns and Repacking.
How Does a Repacked Muffler Change Computer Readings Unless There's a Sensor??
Mufflers Are Past Every Sensor I Know Of.

Photo Posted For Example Purpose Only - Show Me A Sensor??
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Last edited by Docs; Sep 7th, 2008 at 10:55 am.
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post #8 of 10 (permalink) Old Sep 7th, 2008, 4:02 pm Thread Starter
 
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ah, I see. sorry
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post #9 of 10 (permalink) Old Sep 7th, 2008, 6:29 pm
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No sensors in the muffler, but changing the packing affects backpressure, which affects the air flow and volumetric efficiency of the cylinders. The computer probably isn't designed to take into account changes in backpressure. Although I'd have thought the O2 sensor might have given enough feedback to the computer to adjust.

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post #10 of 10 (permalink) Old Sep 7th, 2008, 7:16 pm Thread Starter
 
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I agree with the back pressure comment. that apparently makes a lot of difference.
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