Delkevics Baffles
- Thread starter FastST
- Start date
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.
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
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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- Joined
- Oct 26, 2020
- Messages
- 2,029
- Location
- Makefield Highlands PA
- Bike
- 2016 ST1300P
- 2025 Miles
- 000545
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?
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'
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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You won't have any worries, one or two or none. Sound deflectors.... Ride more, worry less.
Update.
So the initial "issue" was: 14" Delkevic with the baffles in, had the sound which was somewhat muffled and sounded not as deep as I'd like it to be.
Without the baffles it was too loud especially on a roll-on and in a higher rpms.
One baffle in and one out was ok, but I still wanted to keep them in sync.
So here is the Solomon's solution.
Made a half inch hole in the back of each baffle and put them back in. Sounds just perfect. A nice deep tone. Not overly loud yet not a quiet one. Jut what it should be. Reminds me of a Yoshimura I used to have on my other bikes. A deep low sound.
So the initial "issue" was: 14" Delkevic with the baffles in, had the sound which was somewhat muffled and sounded not as deep as I'd like it to be.
Without the baffles it was too loud especially on a roll-on and in a higher rpms.
One baffle in and one out was ok, but I still wanted to keep them in sync.
So here is the Solomon's solution.
Made a half inch hole in the back of each baffle and put them back in. Sounds just perfect. A nice deep tone. Not overly loud yet not a quiet one. Jut what it should be. Reminds me of a Yoshimura I used to have on my other bikes. A deep low sound.
thanks for the update. I luv it when someone innovates,,, gets the results they are happy with,, and then shares it back. It's interesting that I get to compare the sound of my 18" Del's against my 18" 2-Bro's. In general,,, I don't care what my bikes sound like to other people. I wear a Shark transformer helmet,, and also use custom moulded silicone noise filters (ear plugs,, sort of). And, I hate the sound of both my systems, except when I have the head/ear gear on, and the bike is above about 3400rpm. Then they both sound great (to me). Generally,,, I keep the pseudo-baffles in both. But occasionally I pull the baff's out of the Del's, and flip it to the richer afr map for fun. As far as sound goes,, the Del's would pass Ontario's 96db noise limit 9 out of 10 times. The 2-Bro's would pass 6 out of 10 times,,, depending on how good a day the officer is having. A couple of years back,, I was waved through a local OPP spot check when riding the Del's,,, while 3 HD riders with Vance/Hines style pipes were calling flatbeds to carry them home. Sound is becoming more of an issue,,, as systems become louder,,, cheers,, CAt'
Andrew Shadow
Site Supporter
Just be aware that maximum decibel level is not the end of the story when it comes to vehicle noise regulations. Besides a maximum decibel level the law also forbids any exhaust system, be it OEM or aftermarket, to exceed the decibel level of the OEM exhaust system that the vehicle was originally certified with even if that is below the maximum decibel level listed in the law. Whatever decibel level was registered when a particular vehicle was certified becomes the maximum for that vehicle. That right there does in most aftermarket exhaust systems. I don't know what the law in Ontario is but this is the case in Quebec and it is my understanding that this is based on the federal motor vehicle regulations. It most likely ends up depending on what kind of exhaust noise check is being done. On the road most police officers usually just listen for obnoxiously loud exhaust systems and if you are not unreasonably loud they don't bother with you. If they do decide to do a proper noise check this includes using a decibel meter in a controlled environment in accordance with the regulations. Even then it still might come down to how the officer decides to roll. If it is not way beyond the limit they might not bother you about it. Or they might be on a kick that day and just decide to be a total dick and give you a hard time, which is what happened to me and why I know about the regulations.
Do you mean that you feel more power than before you drilled the holes ?? Or before you installed the Del's altogether ?? If it's just the holes,,, then yeah, you are likely imagining it. But enjoy the sound effects,,, lol,,, CAt'I'm also getting the impression of more power. The bike likes to forge ahead
ps: are you getting more re-burn on deceleration ?? If so,, that too may just be more audible than it was before the holes.
