Questions about running straight exhaust (no baffling)

[psycledelic]

Ok, I guess my sealant broke down at the connection between my top termi can and the "S" pipe.  I noticed a vibrating sound and fiddled around until I found it.  Having nothing but time, I pulled the can off, followed by the bottom can, followed by both "S" pipes.  Now I have nothing but my DP midpipes installed.  Can I run the bike like that until this weekend and have time to get some exhaust sealant to reinstall the slip ons?  Will it damage the motor in any way?  My bike is an S2R800 and still runs the Stock ECU and airbox. 

[woppini]

Youll be running on the lean side, so youll have some hesitation. Oh, pick up some ear plugs too

[psycledelic]

What do you mean by lean? (Fuel to air mixture).  What are the drawbacks to running lean?  Is it hurting anything in the motor? 

+1 on the earplugs.  I didn't know that my little bike could make noises like that.

[Slide Panda]

yea, lean in terms of F/A mix. 

There's a sliding scale of good-bad with running lean.  At a tiny (just a tiny bit) bit, you'll get minimal increased heat, but a bit more power.  As you get leaner the bike will run more poorly, HOTTER and loose power. 

If an engine is running too lean the extra heat will take its toll.  Eat up spark plugs at the cheap end... burn a hole in the piston face at the expensive. 

[psycledelic]

yea, lean in terms of F/A mix. 

There's a sliding scale of good-bad with running lean.  At a tiny (just a tiny bit) bit, you'll get minimal increased heat, but a bit more power.  As you get leaner the bike will run more poorly, HOTTER and loose power. 

If an engine is running too lean the extra heat will take its toll.  Eat up spark plugs at the cheap end... burn a hole in the piston face at the expensive. 

When you say HOTTER, is that a noticable difference on the temp gauge, or something that will sneak up and bite me in the ass. 

[Slide Panda]

Well, run lean enough and it'll burn a hole through your pistons - so I would hope you notice that sor tof thign on the temp guage...

Also, higher temps are harder on oil...

[4DoorSi]

I've thought about taking my cans off completely too....so I guess it's not a good idea long term

[Slide Panda]

People have done it... A number of folks run udder only set ups - but the OP doesn't have an udder even - so he's got real short pipes in place right now which is part of the issue.  And the folks who have run udders only have reported mixed result.. though usually it makes the bike run more poorly than other  options.

Folks with DSS monsters have also done some running w/o cans w/ simliar results to udder only set ups on SSS monsters.  Basically.. it's fine, but you get no real benefits that outweigh the detriments... and it's obnoxiously loud... not cool loud... like straight pipe HD loud, which I'm not a fan of.

[MAXdB]

i didnt realize sealant was required between the pieces

[teddy037.2]

i didnt realize sealant was required between the pieces

I don't think it's completely necessary... I had some wurth paste sitting around the garage when I installed my arrows, so I slapped a bit on there.

if I didn't have any on hand, I wouldn't have rushed out to buy any

[MAXdB]

^^ is there any benefit of the sealant? I do notice some stains coming out from between the pieces.. I assume the sealant is suppose to prevent that?

[teddy037.2]

yeah, all it does really is seal all of your joints in the piping.

iirc, it was mentioned somewhere that having those gaps can contribute to popping on deceleration... but not using any is hardly the end of the world


unless maybe better sealing=better exhaust flow?  beats me

[psycledelic]

I assume the sealant was a benefit because what instigated me pulling the can in the first place was a vibration that I was searching for.  I noticed that the top can would move freely at the "S"pipe connection, but the bottom can wouldn't.  (when I say move freely, I don't mean a gap or anything, just a little movement between the two.  The bottom can wouldn't). 

Folks with DSS monsters have also done some running w/o cans w/ simliar results to udder only set ups on SSS monsters.  Basically.. it's fine, but you get no real benefits that outweigh the detriments... and it's obnoxiously loud... not cool loud... like straight pipe HD loud, which I'm not a fan of.

yuu is correct in the obnoxiously loud part.  It reminds me of a straight pipe Harley.  (Although, it is a little more impressive coming out of a little, chromeless Monster.  Depends on what you are into I guess.  I would imagine you would have to be into having neighbors hate you and disturbing the peace citations. 

People have done it... A number of folks run udder only set ups - but the OP doesn't have an udder even - so he's got real short pipes in place right now which is part of the issue.  And the folks who have run udders only have reported mixed result.. though usually it makes the bike run more poorly than other  options.

yuu, (or anyone that will chime in) What is the concern with the length of the pipes? 

[Slide Panda]

I had the cans off my 900 over the winter.  After doing some work I fired it up sans cans.  Sounded a bit old school muscle car at idle... never revved it in that condition.

length of pipes effects exhaust gas pressures.  Inequity in pressure from one cylinder to the other will change the power dynamics of the engine. have a look at this link
http://www.burnsstainless.com/TechArticles/Theory/theory.html
They do a way better job explaining that I could.

[teddy037.2]

revving the bike (esp. a 620!) w/o cans is really, really fun... in that "cool for five minutes" sort of way.

the noise that comes out of it is AWESEOM! 

we all had a laugh, my buddy shot some vid on his phone, then we proceded to finish the arrow install