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Old 01-26-2011, 09:07 AM   #1
Locky
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Default Baffled by baffles

I have a light weight ss 4 into one exhaust on my bike.It's a nice pipe but I would like to get the bottom end torque back.About the only way I could do this is make a baffle for it.Anyone have any experience or thoughts on this?Thanks
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Old 01-26-2011, 10:19 AM   #2
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If it is a 'major brand' pipe, you should be able to purchase a baffle insert for it.

Otherwise, you can put a 'restrictor' in the inlet, between the tailpipe and the can.

Maybe someone makes a 'torque-tube' for your engine, like those for V-twin exhaust ports.

Failing all that, you could put the Stock pipe back on.
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Old 01-26-2011, 10:57 AM   #3
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Quote:
Originally Posted by pushrod View Post
Failing all that, you could put the Stock pipe back on.
That's probably not an option, Yo! Just think of the loss of that 3hp over 13,000rpm's he'd be saddled-with! Or the fact nobody would hear him from 9-blocks away!
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Old 01-26-2011, 11:54 AM   #4
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More likely, an attractive set of stock pipes is either no longer available, or prohibitively expensive. I have that problem with one of my older bikes.
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Old 01-26-2011, 12:15 PM   #5
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Hindle only makes their baffle for the Stealth model with the tapered core my muffler has the straight one and is also a 2 1/4 race can non rebuildable or at least not with out cutting it open.Loud is a bit of an issue also,when the bike comes on the cam car alarms for a block go off,air raid sirens sound and Harley riders with open pipes get pissed off.Let's say if loud pipes save lives I'm friggin mother Tereasa.I could get another can from Hindle but this can is so different from the norm I love it.Like most pure race gear I got it by stupid luck and have never seen an other one.Hindle stopped making them after a short run.
An insert sounds like the ticket put it would sure be nice to have some idea how much to block the pipes flow.There must be some figures out there on what percentage of blockage causes what to the back pressure........
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Old 01-26-2011, 02:46 PM   #6
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Locky, you're going to want to go to a model-specific site.

Your issue is technical and rather specific, and unlikely to find an expert here.

That being said, describe which model and year bike you have, and maybe someone can help.
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Old 01-26-2011, 02:52 PM   #7
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Quote:
Originally Posted by Locky View Post
An insert sounds like the ticket put it would sure be nice to have some idea how much to block the pipes flow.There must be some figures out there on what percentage of blockage causes what to the back pressure........
Know any engineers that work in a motorcycle factory.....or design center ?? I haven't seen any that frequent bike forums yet; some that THINK they are, mind you.............

I've heard of riders spot welding a steel washer to the outlet. That doesn't really do a LOT for the noise but does introduce some back pressure. You can tack on washers with various size holes until you find one you like and then attach one more permanently.

Assuming that the output is actually a tube, you can measure that and shop around for an insertable baffle. To be effective, it must provide some actual blockage; one that you can see straight through does virtually nothing, although they still CALL them baffles.
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Old 01-26-2011, 08:16 PM   #8
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What ER2 said.

Plus, you need to determine what would create the right backpressure at low engine speeds, but not impede the exhaust at higher rpm's.
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Old 01-27-2011, 06:15 AM   #9
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There's a new multi-fit disposable exhaust baffle available. You stick it in for a few days when you need it, and there's a withdrawal cord for when you're done. Here's the website:

www.mototampons.com
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Old 01-27-2011, 06:39 PM   #10
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Lol you guys are funny.After exhaustive research there's more than one way to go about this 70% said they didn't know,20% said I should buy one thing or another,5% made jokes and were no help at all and the rest all gave me different answers which leaves me wondering why the hell I bothered.I'm going to do something crazy like measure the inside of the stock header and put an insert in each header pipe the same size and stick a home made ss baffle dropping the cans inside from 2.25 to 1.75.
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