Author Topic: Speaking of Delkevik slip on - report and DB level  (Read 349 times)

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Offline Fix ur Critter

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Speaking of Delkevik slip on - report and DB level
« on: October 17, 2018, 11:40:58 pm »
Howdy

I bought a used 18 inch pipe on the site. I can’t believe how much lighter and smaller than stock. That alone is reason enough to love it.. Though it looks like the PO took steel wool to it to try to clean it, it is a nice looking pipe, that seems well made.

It did not come with a baffle and when I first ran it, it was too loud for my liking. I actually appreciate the quiet of the OE pipe- and I still wear ear plugs 100%

I emailed Delkevik for an OE baffle but they no longer carry that model in stock. But the customer service rep, Matt was super helpful and said he would see if he could order one from the factory.  It was nice to see an email a couple days later from his manager saying they could and would. Plus he or she gave me several other options and information.

I  asked them for permission to copy paste some of the info they gave me as I think it would be helpful. Will pass along once permission granted

Anyway here are my pros and cons as well as my test of decibels with and without a baffle.

I am not a scientist but I remember that DB rating is not as simple as percentage. A few DB’s is a bigger difference than the simple percentage difference suggests.

In addition to actual db reading the frequency plays a role in how loud it is perceived by humans.

w/o baffle at idle, 98 db
w/o baffle at 3500 rpm, 105 db
with 8” baffle bought on ebay from Florida company, dompco
idle, 88 db
3500 rpm, 92 db

It still sounds meaner than stock. I will keep the baffle in.
 Did not test ride with baffles, but cant image there will be any perceivable difference. As there was really nothing going from stock to slip on without baffle.. If I was forced to  give an opinion I would say it may have actually lost a little something when  FWOT with the slip on.
It did pop on decal a bit.
The only negative thing I will say about this slip on( or any I imagine)  there is a lot more exhaust fumes coming out the pipe.. my garage filled up in seconds where this has never been an issue with the OE.

https://www.ebay.com/itm/8-Long-Baffles-for-2-Motorcycle-Harley-Honda-Yamaha-Etc-Exhaust-Pipes/352418833654?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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Offline SteveJ.

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #1 on: October 18, 2018, 12:18:22 pm »
Has the bike been flashed? If so, which one?
Yeah, if you want true ram air tuning, you better be willing to ram some air! (SiSF)
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Offline connie_rider

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #2 on: October 18, 2018, 01:03:47 pm »
Thanks for the report. I didn't know there was that much change in Db with a baffle..

Couple of thoughts.
 1) The fumes your smelling might be related to the new packing in the muffler. Give it some time and I suspect it will improve.
 2) If your using the baffle you attached(?) I tried that exact baffle in my Area P Muffler. Didn't seem to hurt the power when I
      initially rode the bike. 
      I later compared it with another bike, and learned that it definitely hurt the power, particularly at high RPM's...

Ride safe, Ted
14 Connie (Traveler II) / 03 Connie (Buddy)
Gone but not forgotten; 87 and 00 Connies..

If your not already a COGger, "consider becoming one".
Help us make "OtP" possible again!!

Offline Fix ur Critter

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #3 on: October 18, 2018, 09:11:58 pm »
In reply to some questions

test was done 3 feet from directly behind exhaust. Exact same methodology for  both tests.

Only tested up to 3500 rpm for several reasons. Too loud, to smokey and i dont like reving a cold bike.

The pipe is several years used so new packing is not the issue with exhaust. If you compare the inards of the OE vs this it is pretty obvious how much easier it is for fumes to flow freely. Dont expect it to be much of an issue when moving.

Bike has the basic Schnitz flash, which i am happy with.

I was NOT  looking for performance gains from the slip on- only weight and appearance gains and am happy with those

2 questions for Connie_rider/Ted/ did the area P not come with any baffles? Is that why you bought the ones I linked to ( which is what I am using) also, what is otP

BTW I asked if they offered COG discounts, they said no but Delkevic said it was ok to mention they will be having a black friday sale next month.



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Offline JDSCO

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #4 on: October 18, 2018, 10:46:18 pm »
I have the Delkevic 18" oval, carbon fiber on my 20Kmile C14
I have the "Jim Snyder" baffle mod, albeit a 22mm through hole
I have heard several comments about how quiet my ride is, approaching or departing
One person assumed it was an electric bike
I don't think my bike is loud, at all
Any aftermarket can is a huge improvement over oem, on a few levels

I'm not directly behind my bike at 10k rpm so I cant attest to the noise
but there's not a lot of anyone behind me at 10k rpm, either
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Offline connie_rider

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #5 on: October 19, 2018, 02:20:34 pm »
You are correct, the Area P slip-on does not come with baffle's.
I modified and tried using the baffle you have to see if I could quieten the sound. It did quieten the sound.
  After installation, I did roll-on's with another bike. (with and without baffles)
  The Roll-on comparisons showed that the baffle killed a lot of power and I removed it.
  NOTE: Without doing the comparison, I wasn't certain that there was a power loss.

I now have a ZX-14 header and 2 Area P mufflers on the bike. Love the sound!

"OtP" stands for "Over the Pond".  It's a great deal for some lucky member each year.
    Each year, COG and GCE (our sister club in germany) work together to send a Traveler/Travelers "Over the Pond" to ride in the other Country.  We take nominations, vote, and take up a collection primarily thru the forums.
    If it happens again, next year will be the 18th year and the Traveler/Travelers will be going to Europe.
    NOTE: "OtP XVIII" may not happen as we no longer have a COG {Chief Slave Laborer}..

Ride safe, Ted
14 Connie (Traveler II) / 03 Connie (Buddy)
Gone but not forgotten; 87 and 00 Connies..

If your not already a COGger, "consider becoming one".
Help us make "OtP" possible again!!

Offline Bob

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Re: Speaking of Delkevik slip on - report and DB level
« Reply #6 on: October 25, 2018, 09:58:22 pm »
Is the baffle in the inlet or outlet of the Delkevic?