Best sound

[Kool_Biker]

OK, not sure how to start this ...

But I have bought an new and expensive Delkevic replica OEM exhaust to replace my very old and rusty Marshall 6 to 1 for my Z, only to realise that its sound at anything less than about 6,500 RPM is simply mediocre and cannot begin to be compared to the howl my lowly Marshall.

Is there anything I can do to the Delkevic to improve matters? Half of the CBX charisma must surely be its exhaust sound and despite some of us, I spend relatively little time at 6,500 RPM and beyond.

Cheers, Aris

[gak1047]

I know what you mean. I have the stock exhaust on my 80 and it leaves a lot to be desired compared to the D&D 6 into 1 I had on my 79. Although I am sure my neighbors like my stock exhaust a lot more.

[NobleHops]

I know that was half in jest, but there is some truth to that - The Delkevic actually sounds great, for a stock pipe that is, to hear it go by. While ON the bike it is unremarkable except at full honk.

Steve G did a comparison video a few years back. Lemme see if I can find you a link Aris...

EDIT: Here you go - Steve's caption:

4 different CBX's, 4 different pipes 1) Pipemaster 6 into 6; 2) Kerker 6 into 1; 3) Stock '82 pipes; 4) Bassani 6 into 1, running through 1st and 2nd gears



N.

[Kool_Biker]

Thank you guys, but this does not solve my (our) problem ...
The question is what evasive action there can be applied to the Delkevic, to improve its sound.
I am ignorant about exhausts. But I would imagine the existing baffles can come out quite easily, just by drilling out the two rivetts shown in the attached pic.

P1120407.jpg

And then ... what ?? Help!

Cheers, Aris

[gak1047]

I am not an expert on exhaust systems by any stretch of the imagination but I can tell you this. Years ago in the late 70's and early 80's I worked at a local honda dealer as a mechanic. We had several customers drilling holes into their stock exhaust near the area in your photograh. Their bikes ran horrible. So bad in fact that we had to plug the holes back up to get them to run right again. Their is a science to designing and manufacturing exhaust systems that is well above my working knowledge. When you alter them you alter the way the bike runs as well as how it sounds. My advise would be to refinish the system you replaced and hang onto the Delkevic system or pick up a set of the Pipemasters, they sound awsome.

[Kool_Biker]

All points above are fair, and I thank you.
But this is also why I am asking for the collective wisdom of our forum.
Cheers, Aris

[daves79x]

Can't help you there Aris. I'm a stock exhaust guy. Love 'em the way they came.

Dave

[barryadam]

I am ignorant about exhausts.

Somehow, I doubt that, Aris.
The internals of your muffler may be the same as the original, which is well detailed in the links in this site...

http://www.excite-webtl.jp/world/englis ... %7C+%96%F3+


Barry

[FalldownPhil]

Aris,
If I were in your position, I believe that I would drill out those rivits just to see what is in there. Very possibly, the baffels are wraped in fiberglass or some other sound killer. You might be able to remove a quantity of the wrap to produce the desired sound. I have done this with many different systems. There is even a fair chance that you will not have to re-jet although you will not know until you get there. Usually, it is intake more than exhaust that will require jetting changes.
Best,
Phil

[Kool_Biker]

Hi Phil, what you say makes total sense, I was just trying to avoid all this experimentation .
Having already spent about 2.5 zillion hours restoring, building and re building my bike, I was hoping for a quick win ...

Last weekend I witnessed some bike classic racing near Athens. There were about 30 bikes in total, all classic, of various types, some quite juicy stuff.
And, there was a single CBX B or C (naked though).

P1120424.jpg

After the runs, there was a general consensus among most spectators that it had by far the best sound.
It was a joy to hear this bike flat out around the track. As for its exhaust, I think it was a six into 1 laser ...

In case you are wondering why yours not racing, I am carefully running my Z ...
And in any way, early in the day it got friendly with a certain lady there (borrowed from the Ducati clan) and was refusing to do anything for me . No manners, at all ...

P1120524 - Version 2 (1).jpg

Cheers, Aris

[Jeff Bennetts]

Bubblelishess...

[fastfreddy52]

This system was custom made and was on a 79 I bought years ago and since sold , big mistake as I put an ignition, accel coils, modified clutch basket , no rattle , an external alternator , a primary sprocket for an 82 which lowers the RPM whilst cruising and more . Six Dirt Bike Cans polished up and down spouts welded to the rear plates on the cans . Very cool , I’m trying to have a set created for me off of the pictures . Not only did they look cool but whomever packed them with fiberglass got the sound just right . I’m working on anothe4 79 and will set it up the same way .

[daves79x]

Welcome! Pipemasters makes a quite nice 6-6 exhaust if that's the way you want to go. To each his own, but have to say I'm not a fan of those custom pipes, but I'm not a 6-6 fan anyway. Carry on though!

Dave

[EMS]

I remember a member from Michigan (Mike?) made an almost identical exhaust for his black '80. Maybe he will chime in.