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exhaust modifications

PostAuthor: grazingazer » Fri Jan 20, 2012 1:01 pm

lots of folks post threads to the forum stating that they want to run drag pipes on their street bikes and how to re-jet for them or they want to remove the baffles from their mufflers and my reply is usually that it is a bad idea...for which i am chided...insulted or flat ignored...well here is a video compiled by a recognized professional in the field giving you the straight skinny on the issue:
www.youtube.com Video from : www.youtube.com

be advised although the s and s carb was selected as the test subject the theory holds true for all carburetors and all straight through exhaust systems hopefully this will dispell the bs that circulates these days...as far as raising carb needles or re-jetting for less restrictive exhaust those are valid fixes as long as the exhausts involved are baffled to account for the anti-reversion physics involved but drag pipes belong on the strip or the showroom floor not on the street
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Re: drag pipes

PostAuthor: buzz1100 » Fri Jan 20, 2012 3:23 pm

I discovered this fact by accident. Had put a set of Cobra drag pipes on my 97 1100 when it was fairy new. Re jetted and had it running what seemed to be pretty good. Sounded great. The next spring one of the pipes started to rattle, so I took them off and put my stock, although gutted, so not quite stock, pipes back on. Couldn't believe the difference in seat of the pants feel. I would like to go to a two into one system. What are the available options? Been looking around but haven't found much for Viragos.
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Re: drag pipes

PostAuthor: Wesso » Fri Jan 20, 2012 3:59 pm

@ Graz... You'll certainly not get an argument from me on that. The video that you posted was most educating and answers a lot of questions I'm sure.
I have always said that the manufacturers would not do all that research and have all those specialists working for them on high incomes just to sell the public something that is not performing to 100% of it's capacity.
Like Bruce said in his video, drag pipes may look good but there's really only three places suited to them... The showroom floor, the track or in the rubbish skip.
I guess it's much like running bigger tires or different sprockets on your bike... Once again I'm sure the motorcycle manufacturer has done their homework and have given us the best possible combinations for gearing on our bikes. The thing that changes here of course is the weight and size of the person riding the bike. They are all contributing factors that the manufacturer can only work on an average to come up with the best possible performance but they are usually very close.
Cheers
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Re: drag pipes

PostAuthor: Jake » Fri Jan 20, 2012 4:50 pm

You know there are those that still will disagree.

@buzz1100, I sent you a PM so as NOT to thread jack this topic.
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Re: drag pipes

PostAuthor: grazingazer » Fri Jan 20, 2012 5:34 pm

let 'em...i knew a guy that thought he could check the water level in his battery with a zippo till the damn thing blew it's top...some people learn the hard way...i told you guys about the bolt trick a long time ago...i'm not talkin' war wounds i'm just sayin'...what the video didn't tell you about drag pipes and why your bonneroo racers stuff the ends whe not in use is that cool unrestricted air entering the exhaust can crystalize an exhaust valve and cause it to shatter when it gets hot and brother they get unbelievably hot in air cooled engines...prop planes used to use water injection to smooth things out
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Re: drag pipes

PostAuthor: grazingazer » Fri Jan 20, 2012 5:43 pm

ps; the 2 into 1 exhaust has been proven over and over to be the most practical and effective system for producing the ideal mid-range torque specs for the cruiser or touring motorcycle...the old guys knew their stuff and back then they might as well been riding baja every day considering the surface of the roads
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Re: drag pipes

PostAuthor: ms8238 » Fri Jan 20, 2012 9:53 pm

video stopped right before the wrapped baffles in the drag pipe test???
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Re: drag pipes

PostAuthor: grazingazer » Fri Jan 20, 2012 9:59 pm

mine said it restricted the exhaust to where the motor could only make less than 40hp at 4500 rpm
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Re: drag pipes

PostAuthor: ms8238 » Fri Jan 20, 2012 10:09 pm

Id like to see a test with flapper valves, use to be internal ones they sold to stop revision but if you can't see em flap whats the point ;)
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Re: drag pipes

PostAuthor: grazingazer » Sat Jan 21, 2012 12:32 pm

ttt
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Re: exhaust modifications

PostAuthor: Jake » Thu Jul 24, 2014 9:16 am

GG, I was looking for something else and cam across this again. I figured it was time to sticky it, so I have.
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Re: exhaust modifications

PostAuthor: grazingazer » Thu Jul 24, 2014 11:36 am

thanx jake...maybe it'll save the engines on all these newb bobbers being built
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Re: exhaust modifications

PostAuthor: Jake » Thu Jul 24, 2014 11:51 am

At least we can point them to this thread when they make carb and exhaust changes.
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Re: exhaust modifications

PostAuthor: Marvelicious » Thu Jul 24, 2014 12:22 pm

All you can do is post the info. There's no help for people who refuse to believe it.
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Re: exhaust modifications

PostAuthor: Hellgate » Thu Jul 24, 2014 10:56 pm

Thank you for posting this. As you said this holds true for all motors. If only "they" would listen. Shake head...
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Re: exhaust modifications

PostAuthor: gleam » Thu Jul 24, 2014 11:22 pm

Neat I watched a bunch of their videos a few months ago when I was trying to learn about carburetors. Was the first time I had heard that point of view and it was pretty interesting.

Would the MAC Tapers I have qualify as drag pipes in this sort of discussion? They're not stock but I don't think they're fully open either.
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Re: exhaust modifications

PostAuthor: Marvelicious » Fri Jul 25, 2014 11:32 am

This isn't an indictment of all non-stock exhaust. Those MACs have baffles in them, and therefore should be fine. You see how much they accomplished with just a wing nut; even a very free baffle system is going to break up that pressure wave considerably more (as long as it doesn't cut your diameter down to nothing like that drag pipe insert in the video). The key is an intermediate step between header pipe diameter and open air.
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Re: drag pipes

PostAuthor: stephane » Mon Mar 09, 2015 9:40 pm

grazingazer wrote:ps; the 2 into 1 exhaust has been proven over and over to be the most practical and effective system for producing the ideal mid-range torque specs for the cruiser or touring motorcycle...the old guys knew their stuff and back then they might as well been riding baja every day considering the surface of the roads

Good video thanks, i was planing on putting drag pipes on mine 1- for looks 2- louder exhust but now .....i'm planing to make my own 2in1 one exhaust on my 1100 found this site last night
http://www.coneeng.com/motorcycle_components.html
:usa: hope they ship to canada :chop:

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Re: exhaust modifications

PostAuthor: Hellgate » Sat Oct 31, 2015 8:57 pm

I just watched this again, such a good video.
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Re: exhaust modifications

PostAuthor: mark75 » Sat Mar 12, 2016 4:52 pm

:bump:
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