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Message started by Chaz on 04/25/17 at 23:40:26

Title: Exhaust Bypass Valve
Post by Chaz on 04/25/17 at 23:40:26

I use the Harley Dyna muffler right now and I love it, I have no complaints. I would just really like the Savage to be a tad bit louder when I'm on busy roads, but I'd like it to be tolerable when I'm in the neighborhood. I've looked into a little bit and I think I might be able to use an electronic exhaust bypass valve. Something like
http://www.siliconeintakes.com/images/product/AllFlowCutoff-Main.jpg

So it can switch from a muffled exhaust to a straight pipe with a switch or something. Has anyone every tried something like this? Would there be any long term affects on the engine?

Title: Re: Exhaust Bypass Valve
Post by Dave on 04/26/17 at 03:29:27

An engine with fuel injection might be able to adapt to the fuel mixture changes needed when switching from a muffler to an open pipe - the carb on the Savage can't. If you jet the carb to run with the muffler....it won't be jetted to run with an open pipe (the Savage engine doesn't run well with an open pipe anyhow).

I am not a fan of open pipes on anything....even your lawn mower. It really promotes folks developing the wrong attitude toward us bikers.

Title: Re: Exhaust Bypass Valve
Post by norm92de on 04/26/17 at 08:06:10

I'm with you Dave.

Some of the bikes I hear are appallingly load. It sure doesn't help our public image. :'(

Title: Re: Exhaust Bypass Valve
Post by Ruttly on 04/26/17 at 12:09:44

In my crystal ball I see burnt exhaust valves in your near future!!! ;D

Title: Re: Exhaust Bypass Valve
Post by Chaz on 04/26/17 at 16:05:25

7F44495E4F43585E454D405F2C0 wrote:

You're right, I didn't realize how loud open pipes were on the Savage. Instead of an open pipe and the harley muffler, what if I get two custom muffled pipes, one a tad bit louder than the other, and the other relatively quiet? Would the Savage be able to adapt to that?

Title: Re: Exhaust Bypass Valve
Post by hotrod on 04/26/17 at 16:07:00

In the open position you might as well get off and push.

Title: Re: Exhaust Bypass Valve
Post by Ruttly on 04/26/17 at 18:27:32

Maybe , Maybe 2 nicely baffled mufflers , but with one you would be rich and with two you would be lean,not good. If it had EFI it would be fun to play with. Otherwise just stick to a muffler your happy with !

Title: Re: Exhaust Bypass Valve
Post by Ruttly on 04/26/17 at 18:34:08

Just curious , Where did you find that and how much does it cost ?

Title: Re: Exhaust Bypass Valve
Post by batman on 04/26/17 at 18:47:49

K.I.S.S.-system,pick a muffler between loud and quite and tune the carb to it.I don't know where you would find room on this bike to hang two different mufflers,much less how ugly it would look.

Title: Re: Exhaust Bypass Valve
Post by buster6315 on 04/26/17 at 20:28:42

311617170F1A630 wrote:

Just curious , Where did you find that and how much does it cost ?

I've considered one of these cut-outs. However, John Law would probably fine you if he caught you with one.

Title: Re: Exhaust Bypass Valve
Post by batman on 04/26/17 at 20:46:35

The idea of one of these isn't the problem,nor is it the cops. go take the muffler of your bike and take it for a ride with just the header pipe and you'll soon get the proof that it's not going to work, the bike will run like sh*t.(wear hearing protection!)

Title: Re: Exhaust Bypass Valve
Post by Dave on 04/27/17 at 03:58:22

If you have some fabricating skills, it would not be all that hard to alter a muffler with a removable core to have a "dual" type of baffling.

There could be a butterfly plate in the pipe going through the muffler, and in the closed mode the exhaust would pass through the perforated center pipe - in the open mode the exhaust would pass straight through. The butterfly could be manually operated with a cable and spring......it would be a bit more complicated and expensive to make it electrically operated. Quite a few modern bikes have a butterfly in the exhaust to provide the needed restriction at low engine rpm, and you could source one of those header pipes to get the valve and spring. In the "open" position it would still be possible to have some baffling in the center pipe so that the system would not be a straight pipe and provide the needed obstruction to the pressure waves (reversion) that makes the engine run so poorly.

Is it worth the effort to build one......I don't think so.

Title: Re: Exhaust Bypass Valve
Post by norm92de on 04/27/17 at 07:21:01

I think it would be a good cut out switch. ;D

Title: Re: Exhaust Bypass Valve
Post by batman on 04/27/17 at 09:27:15

Dave,reversion waves don't make the motor run poorly.They make it run better. The waves reverse when they reach the end of the header pipe and return as a negative pressure ,if they reach the exhaust valve before it closes (during valve overlap ) it pulls the remaining exhaust gases out while helping to pull a fresh fuel in, this is why the header length is important. If you run a muffler with no baffle or a straight pipe the reversion doesn't occur until the wave hits the end of the entire system,and arrives back at the exhaust valve to find it closed.the wave leaves the motor at the speed of sound (mach 1) but the exhaust gases travel at a much slower rate, as they give up heat to the header pipe /muffler they slow and also slow the reversion wave on it's return to the exhaust valve,which is why a gutted muffler or straight pipe hurts performance.

Title: Re: Exhaust Bypass Valve
Post by Dave on 04/27/17 at 09:49:15

Reversion is not always your friend.

https://www.youtube.com/watch?v=KjKUKhHQLHg

[media]http://www.youtube.com/watch?v=KjKUKhHQLHg[/media]

Title: Re: Exhaust Bypass Valve
Post by batman on 04/27/17 at 10:24:49

Dave ,no it's not your friend if your not running a good muffler,my point exactly ! noise = bad performance most of the time,and makes it hard to jet the carb.but reversion can be your friend and enhance VE (volumetric efficiency) as I said above. We have mid range sag not because of the exhaust but do to the factory jetting in our stock carbs ,which is why the white spacer mod to lift the jet needle is so effective . Higher VE allows a better fuel charge into the cylinder which gives better hp/torque.

Title: Re: Exhaust Bypass Valve
Post by Chaz on 04/28/17 at 09:13:39

I didn't expect this to get so much attention. I would eventually like to do it, but I think I'm gonna go with two custom baffled pipes, one louder than the other. The electronic servo box is a little big so I might just have it manually operated because I don't think I could manage to hide that on this bike. If I end up blowing up my bike, then so be it, I'll ride my other bike while I fix the savage up again. I appreciate all the responses though!

Title: Re: Exhaust Bypass Valve
Post by verslagen1 on 04/28/17 at 09:37:22

I've used the supertrap and appreciate it's ability to adjust the backpressure to affect the a/f mixture in finer detail than you can do with jets alone.

But if I were to mess with it further, I would put in the minimum disks and spring load the end cap for the best of both worlds... quiet at low throttle settings and wide open when I'm wide open. [smiley=evil.gif]

Title: Re: Exhaust Bypass Valve
Post by Ruttly on 04/28/17 at 10:14:20

Add a Intelajet so you can adjust it on the fly. Mounted mine on the bars on left side.

Title: Re: Exhaust Bypass Valve
Post by justin_o_guy2 on 04/28/17 at 12:50:40

Given a choice, I'll take getting reversioned over reaccomodated.

Title: Re: Exhaust Bypass Valve
Post by batman on 04/28/17 at 14:01:39

or go crazy and put a supercharger on it ,to accommodate any speed. How deep is your pocket?how often do you want to rebuild your motor? how often do you want to change your oil?how loose is the nut between the handlebars and the seat?I don't do anything to my bike that will jeopardize what I feel is the under lying reasons I love this bike and that's it's reliability and simplicity .