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EXHAUST CHANGES PER YEAR

Posted: Thu Oct 22, 2009 12:30 pm
by twinegar
Did Honda use the same exhaust on the 79 and 80 or were they channeled differently inside for 80? The reason I ask is that my 80 sounds more like a 12 cylinder Ferrari. Maybe my 79 needs some valve work but it runs smooth as silk.

Posted: Thu Oct 22, 2009 12:48 pm
by EMS
The exhaust for the 1980 was changed to adapt to the changes in valve timing. It is less restrictive than the 1979. The part-number is also different, indicating it is a different item.

Posted: Sat Oct 31, 2009 4:00 pm
by twinegar
Would a welder be able to cut the #1 header pipe off at the bottom end near the shield and weld in another one? The is an 80 left side exhaust for sale that has a mashed area and because the 80 exhaust is different from the 79 I am thinking about grabbing it. Opinions please!

Posted: Sat Oct 31, 2009 4:08 pm
by alimey4u2
Double wall may pose a problem I would think but may be possible...

Posted: Sat Oct 31, 2009 4:11 pm
by twinegar
Ebay 290363166503.
Should I wait for another to show up? $100 seems a little steep.

Posted: Sat Oct 31, 2009 4:15 pm
by alimey4u2
Inner pipe would be crimped on that twine, I would look further ...

Posted: Sat Oct 31, 2009 4:23 pm
by twinegar
Thanks, I set my bid sniper on and off three times before finally turning it off. How often have you seen 80 pipes for sale................anyone?

Posted: Sat Oct 31, 2009 4:26 pm
by twinegar
Any thoughts on pouring Rustoleum in the muffler to coat the bottom third and them pour out the extra? The area where the muffler welds to the down tubes is swelling but not through the chrome yet so maybe sealing the inside would extend the life a bit. A drain hole will be drilled also.

Posted: Sat Oct 31, 2009 6:38 pm
by alimey4u2
Wots the maximum working temperature of Rustoleum twine... ?

Posted: Sat Oct 31, 2009 6:51 pm
by twinegar
Not sure what the temp range is and I only mention Rustoleum because I read it here someplace. I had considered using liquid tar but again am not sure about the temp but it would probably smoke some at first and then lay down a gooey coating that would keep the moisture off. I read that Honda coated the inside of some of their exhausts with some sort of asphalt and it got me thinking. I was hoping I would trigger a discussion and someone would know more about it or had done it successfully.

Posted: Sat Oct 31, 2009 8:15 pm
by alimey4u2
twinegar wrote: I was hoping I would trigger a discussion and someone would know more about it or had done it successfully.
Unlike myself... :oops: :lol:

Posted: Sat Oct 31, 2009 9:11 pm
by twinegar
I am definitely going to try something. I think tar would work considering how hot it is when they apply it to a road surface. I doubt that a bike exhaust at the muffler gets any hotter.

Posted: Sun Nov 01, 2009 4:12 am
by alimey4u2
Tar would work for sure but until the "light ends" ( volatiles) had flashed off, there would be a possible risk of fire... Something akin to a chimney fire.. :?

I like your train of thought though... :idea:

Posted: Sun Nov 01, 2009 11:03 am
by Don
I would think that tar would be problematic on many levels . . . . on top of everything else, it would STINK

I'd find something better than that - Perhaps a paint marketed for barbecues? I'd try the Rustoleum before I resorted to tar

Don

Posted: Sun Nov 01, 2009 12:02 pm
by ericfreeman
Kreem makes a ceramic-based liquid I've used to coat the inside of my Ironhead Sportster pipes to eliminate any bluing. Easy to use and it appears to be very effective. I'd imagine it would prevent corrosion as well.

Eric