Delkevics Baffles

FastST

FastST

Joined
Oct 28, 2024
Messages
36
Age
63
Location
NJ
Bike
ST1300
Probably sounds unusual, but do the Delkevic baffles need to be in pair (right and left) or not necessarily? I like the sound when only the right baffle in, lol
 
Can't complain about the torque, but is it possible riding with only one baffle?
 
There's nothing that says every cylinder must match, if each one is properly tuned, except maybe vibration.

A four-cylinder engine is basically four one-cylinder engines that share a crankshaft.
 
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The back pressure probably will be different on each side. Now I'm thinking can it affect the engine?
If all baffles are in or all are out, two sides of the engine are working consistently.
But when one baffle is in and one is out, then it is razing a question
 
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Willsmotorcycle said:
Reduce both baffles to half the size, packing, or number of holes drilled, then its half of what it was and you can install both?
Click to expand...
Would be good to experiment but wouldn't like to destroy them by making holes.
Can anyone contribute their unneeded baffles? :)
 
I have been using Del's for a long time now. We refer to the "baffles" as such,,, but they are really sound deflectors,,, and not proper baffles (which would have holes in them). When installed, they simply deflect the exhaust pulse out towards the packing,, which will absorb more of the sound energy. I have the 18" oval Del's,,, which came with the standard length "baffles". I have run with both them installed and removed for extended periods. One day,,, one sides baffle came loose and dropped out, never to be found. But I am pretty attentive so I noticed the sound difference right away, but just didn't realize what had caused it. Not being a "loud pipes" guy,,, I ordered a set of extended length baffles/deflectors to replace the lost one (see picture). So now,,, since I have the dual map Bazzaz setup (works fantastic, btw),, I run with the baffles in on the eco afr map,, and remove the baffles when using the performance map. The difference in sound performance is not huge,, and the stock narrow band o2 sensors will adjust the fuel mixture slightly to try and compensate for a bit leaner mixture. You may notice a bit more reburn. But I doubt that it will be significant. Keep us posted of your results,,, cheers, CAt'

20180801_163002.jpg
 
FastST said:
The back pressure probably will be different on each side. Now I'm thinking can it affect the engine?
Click to expand...
If you still have the oem exhaust headers,,, there is a cross pipe,,, and it's purpose is to equalize pressure. So it will do that. When I lost one of my baffles,,,, I soon started riding without any,,,, and it wasn't so much different especially at highway cruise. But I didn't like the tone as much at idle and at in-town speeds,,, so I went back to the extended length baffles. On an otherwise stock ST13,,, this is more about sound,, and not so much about performance. The del's will however, smooth out the sag in the mid range torque curve,,, and the weight reduction will improve acceleration. So you will get a reasonable bang for your bucks,,, and some people prefer the sound. I admit,,, that I do,,, CAt'
 
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