"Tweaked" 801 stock muffler
- Thread starter Tom
- Start date
toast449
top rider
Holy hell that must have been a lot of sanding and filing to get that fit that snug inside and out!
Today I noticed that the pipe of the db-killer suddenly stuck a couple of millimeters out of the muffler.
I checked it; wondered that it was quite difficult to remove the db-killer; and that's what I've found; definitely not what I've expected.
The melting temperature of aluminum starts at about 600°C; the exhaust gases are too hot.
The adapter-ring made from 20mm aluminum doesn't work.
I checked it; wondered that it was quite difficult to remove the db-killer; and that's what I've found; definitely not what I've expected.
The melting temperature of aluminum starts at about 600°C; the exhaust gases are too hot.
The adapter-ring made from 20mm aluminum doesn't work.
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blue_monkey
top rider
Was it fairly straightforward to remove the stock baffle? You mentioned drilling around the metal plate... is there enough room for a dremel with a disc cutter? Thanks.
BTW, your engineering is very impressive
BTW, your engineering is very impressive
Thank you!
I did it by drilling the sheet metal around the stock DB-killer; it's made from stainless steel, but not too thick; drilling worked fine, but I don't think it will work with a Dremel.
Afterwards I did some grinding and some filing to smoothen it out; I used a straight-grinder.
At all, with some proper tools it's not too difficult.
I did it by drilling the sheet metal around the stock DB-killer; it's made from stainless steel, but not too thick; drilling worked fine, but I don't think it will work with a Dremel.
Afterwards I did some grinding and some filing to smoothen it out; I used a straight-grinder.
At all, with some proper tools it's not too difficult.
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blue_monkey
top rider
Thanks for replying. I only have basic tools but I think a drill and file should do the trick.
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With a file instead of a straight-grinder it may take a little longer, but it should also work without a problem.
On the internet...
Someone who bought his 801 with an Akrapovic sold his stock muffler to me.
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blue_monkey
top rider
How loud is the standard exhaust with the baffle removed, Tom? Is it easy to live with day-to-day?
It depends on the "officials" in your region, but in my opinion it should be absolutely fine; the pre-muffler (catalyst) takes most of the loudness.
From what I've read, the Duke 790 / Pilen 801 engine "likes" a muffler with big volume and some "backpressure"; that's why you'll always loose some performance with the smaller (and also louder) aftermarket mufflers; the stock Duke 790 and Pilen 801 mufflers are very good performers.
With the stock 801 muffler and the small DB-killer you'll have still the same "big" volume and still some more backpressure; I don't know, if it'll make a big difference, if you'll delete the db-killer completely.
I also don't know (especially after my experience with the deformed aluminum spacer) if the coating of the black tip-cover is heat resistant and will take the direct heat of the exhaust gases if you'll delete the db-killer completely.
If you'll give it a try, report from your experiences.
From what I've read, the Duke 790 / Pilen 801 engine "likes" a muffler with big volume and some "backpressure"; that's why you'll always loose some performance with the smaller (and also louder) aftermarket mufflers; the stock Duke 790 and Pilen 801 mufflers are very good performers.
With the stock 801 muffler and the small DB-killer you'll have still the same "big" volume and still some more backpressure; I don't know, if it'll make a big difference, if you'll delete the db-killer completely.
I also don't know (especially after my experience with the deformed aluminum spacer) if the coating of the black tip-cover is heat resistant and will take the direct heat of the exhaust gases if you'll delete the db-killer completely.
If you'll give it a try, report from your experiences.
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