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Message started by diamond jim on 06/21/09 at 21:59:18

Title: new longshot baffle
Post by diamond jim on 06/21/09 at 21:59:18

5F7A7D7B577A6C150 wrote:

...and I can't wait to see what diamond jim has up his sleeve.
JB

JohnBoy, here's where I'm at. This is a one piece baffle with an internal section that slides into the pipe and an external section that slides about an inch over the end of the pipe.
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/1-31.jpg
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/3-21.jpg

In this pic, the red lines illustrate the exhaust pipe. The yellow is the internal diffuser plate.
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/5-11.jpg

The exhaust hits the first plate of the diffuser cone where some goes through the small center hole while most goes around, hits the shoulder of the diffuser then gets forced through the small diffusing holes of the cone at a 90 degree angle. Then the exhaust does another 90 degree angle and proceeds through the second diffuser plate (yellow) then out the bell-shaped end. On the diffuser cone, I slowly added holes and tested until the pressure was reduced and the tone deepened. So, it's 90 degree bend, diffuser, 90 degree bend, diffuser, exit. It's pretty darn free-flowing and because it's a deep tone it really doesn't sound that loud.

Still gotta prep and paint. I run with it at the Dragon this weekend.

Title: Re: new longshot baffle
Post by JohnBoy on 06/22/09 at 08:01:13

This looks way cool, and very thought out.
I can follow the concept of the gas passing through and around the first diffusing plate and back into the pipe at the end of the neck and out the 2nd diffuser plate. But I am unclear as to the cut marks in the side of the baffle? From the end view it appears that the bell is welded around the baffle preventing any gas flow from escaping around the outside of the baffle. What function do the cut marks play in the flow of exhaust gas?
Can you also provide some input on diameters and dimensions?

This looks like something that I can get my muffler guy to help me build.
Great job Jim!!!

Title: Re: new longshot baffle
Post by diamond jim on 06/22/09 at 10:18:11

BTW, this is a 2" pipe. The muffler guy made me another pipe. But you could either do something like this with 1 3/4" pipe, or have guy add a 2" section after the mounting bracket. Or even a 2 1/4" and look at incorporating a little supertrapp characteristics.

The cuts do to things, one of which I decided not to do. First, They keep the walls after the vertical diffuser plate from being smooth, adding a little bit of turbulence and tumble. Not much, but a little. Second, you can insert some fender washers into the slots so half is inside and half is sticking out. Then weld them in place and grind off the part of the washers sticking out on the outside. You end up with half circles inside adding to the baffling.

Title: Re: new longshot baffle
Post by odvelasc on 06/22/09 at 18:40:03

323F373B3938323C3F3B560 wrote:

How much has this whole set up cost you?

Title: Re: new longshot baffle
Post by mikestrikes on 06/22/09 at 19:31:08

How much has this whole set up cost you?

In US dollars or Canadian Bacon............. ;D

Title: Re: new longshot baffle
Post by diamond jim on 06/22/09 at 19:36:20

Pipe and baffle: $22.16.

$5 of that was a tip cause muffler dude has been pretty cool helping me out with this stuff. $2.16 was cause I had to go to Advance Auto to get the piece for the diffuser cone. He didn't have any that small. Already had the square steel for the mounting bracket.

Title: Re: new longshot baffle
Post by JohnBoy on 07/25/09 at 07:31:12

Hey Jim,
I know you were down for a while but have you had a chance to try this out and get any feedback on overall results?

Title: Re: new longshot baffle
Post by Spydre on 04/27/18 at 08:39:45

Sorry for bringing a thread back from the dead, but I've been wanting to put a drag pipe on my Savage, but am worried about it really messing with the back pressure and tuning. It sounds like this was a design that worked pretty well, but since the pictures are down it's tough to find instructions on replicating it. Any ideas?

Alternatively, I was looking into BCB drag pipes, but it looks like they may have discontinued them

If there are any proven designs or aftermarket drag pipes that work well with a Savage, I'm open to that, too.

Thanks!

Title: Re: new longshot baffle
Post by Eegore on 04/27/18 at 09:22:25

BCB drag pipes had a baffle in them further up than what I have seen as normal. They are discontinued, but given its literally just a straight pipe setup I cant imagine some exhaust shop couldn't rig one up for a reasonable price.

I have been meaning to look into this myself once I get back to one of my bikes.

Title: Re: new longshot baffle
Post by LANCER on 04/27/18 at 10:00:31

Diamond Jim was an engineer and worked on this pipe/baffle for some time with quite a number of variations before he came up with a design that actually worked. His design is the only one I have seen that works pretty well on the Savage. His bike had a stock engine with jetted stock carb and this exhaust. His bike dyno'd at 30-31hp and ran pretty smoothly with an occasional hiccup. He made slight changes to the body which made it look long and lean. It was a very pretty bike. I called it Black Beauty.
My son bought it from him when he thought he would never be able to ride again, and then sold it a year or two later.

If someone can recreate this pipe from his description that would be helpful for folks here who really want a straight pipe exhaust.

Title: Re: new longshot baffle
Post by verslagen1 on 04/27/18 at 14:02:22

http://i255.photobucket.com/albums/hh128/russ_diamond_jim/1-31.jpg
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/3-21.jpg
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/5-11.jpg

If anyones got the pics I can look into it.

Title: Re: new longshot baffle
Post by sandmanred on 04/27/18 at 15:12:32

If I follow the thread I think have done something similar on both the Savage and a little Honda 250 twin. I did this same thing on a little Honda 250 twin and it worked great. Here's pics of what I have done on my Savage engine.

The header is 1 5/8" 16g 304. The insert is 1 1/2" 11g steel on the large diameter and 7/8" 12g where the cuts are. The baffle is about 6 inches long in the 7/8 diameter section. I have been 'adjusting' the open area by adding or subtracting cuts.

I started with 9 cuts and now I'm at 7. I ran it for a short time at nine cuts and then welded up two based on plug color and backfiring. It's maybe a little rich based on the last plug inspection but I'd rather be a tad rich than lean. Smokin Blue took it for a short spin and felt that the back pressure was OK based on his experience.

On my little Honda I've added and subtracted a lot of baffle due to some carb issues (in hindsight). But I was always able to improve the tuning substantially by opening or closing the baffle based on how it was running and the color of the plugs. I did also learn the length of the baffle is important. Too short and the noise is piercing at mid and upper rpms, a longer baffle smoothes it out a bit.

Here's a link to a short video from when it probably had nine cuts in the baffle. https://www.youtube.com/watch?v=G9yMYHVa4mk

http://https://s6.postimg.cc/r7ngpqav5/IMG_10735.jpg (https://postimg.cc/image/gktnkb2pp/)http://https://s6.postimg.cc/pfuhutjsh/IMG_10737.jpg (https://postimg.cc/image/94udyi7al/)http://https://s6.postimg.cc/6nimr87yp/IMG_10738.jpg (https://postimg.cc/image/9ud6ausel/)http://https://s6.postimg.cc/smp1efwip/IMG_10739.jpg (https://postimg.cc/image/l6prsn8t9/)http://https://s6.postimg.cc/466vjygch/IMG_10740.jpg (https://postimg.cc/image/ddz40nnel/)