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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Another exhaust question... /cgi-bin/YaBB.pl?num=1358443649 Message started by Lucaisrussell on 01/17/13 at 09:27:27 |
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Title: Another exhaust question... Post by Lucaisrussell on 01/17/13 at 09:27:27 So I'd like to do a little exhaust work to the bike but have a few questions. I want to do a turn down right where the muffler would hook up with no baffles. My question is; will using a smaller diameter at the very end of the pipe compensate for not having a baffle to create back pressure? If so, what ID should I use in respect to the stock pipes size for optimal Proformance? And, would I just be better off buying a muffler for this thing? I made my own exhaust but I feel the piping is too long and I'm not happy with the way it sounds. If you can't tell by my build its on a budget so cheap suggestions please!! |
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Title: Re: Another exhaust question... Post by WD on 01/17/13 at 09:34:16 Small exit is going to actually make the exit pressure stronger. Think old fashioned hose nozzle... I used a generic auto part store turn down for awhile. Wind it up near an ant bed, chop the throttle closed, no more ants... ::) Keep a close ear on your valves, a stubby pipe is going to cook the exhaust valve. |
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Title: Re: Another exhaust question... Post by Lucaisrussell on 01/17/13 at 09:40:20 I see what you're saying. I definitely want some back pressure and I don't want to be replacing valves till after the summer. But if we compare it to a hose it only flows stronger because of the pressure it's building up. So wouldn't a smaller diameter opening create the back pressure I need to prevent cooking valves? |
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Title: Re: Another exhaust question... Post by WD on 01/17/13 at 10:22:38 Shorty pipes on air cooled engines tend to cook valves, regardless of the tip style. I don't know all the physics and flow dynamics, I just know I've burned out a few in my day. |
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Title: Re: Another exhaust question... Post by verslagen1 on 01/17/13 at 11:26:38 Singles ingest a lot of air in between pulses, so even a small hole on the backside won't solve the issue. I'd put a baffle at the end of the header and at least a shorty muff on. |
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Title: Re: Another exhaust question... Post by houstonbofh on 01/17/13 at 15:19:44 I good in-between is a brass plumbing reducer with some holes drilled in it. Something like these with holes drilled in the reduction part to tune the sound. http://www.lulusoso.com/upload/20110529/Copper_Fitting_Reducer_Reducing_Coupling.jpg |
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Title: Re: Another exhaust question... Post by Lucaisrussell on 01/17/13 at 22:22:55 Is there any special reason for using brass? |
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Title: Re: Another exhaust question... Post by Lucaisrussell on 01/18/13 at 09:53:18 Alright so what I did was took a 6 inch piece of 1 1/2 inch piping with a little turn down n welded it on. Bike sounds a lot meaner! Also I noticed a slight increase in my lower end. Now I don't know if its the half gallon of 110 I put in this morning but the bike seems to be flowing a lot better and I'd like to credit the exhaust a little bit. Also feels like I'm retaining my back pressure. The pictures not the final product but my friend with the welder is short on hose clamps. |
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Title: Re: Another exhaust question... Post by houstonbofh on 01/19/13 at 18:11:48 794056545C4647404646505959350 wrote:
It is a plumbing part, so you are limited to what is used in plumbing. Brass is used because it does not rust. Not a real concern in exhaust, but actually somewhat handy. |
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Title: Re: Another exhaust question... Post by Greg on 01/20/13 at 07:48:57 Why wouldn't you spend less money and aggravation and purchase a baffle made for the application? http://images1.jcwstatics.com/is/image/Autos/GRP-36020g_1?$JCW_MAIN$ |
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Title: Re: Another exhaust question... Post by diamond jim on 01/20/13 at 08:39:33 Turned down with no baffle will be really loud for you while riding due to reflection off the ground. I did lots of experiments with intake and exhaust when I had my 650. Longer will maximize the torque. Having the pipe end about halfway between the rear axle bolt and back of the rear tire maximized my torque. I wouldn't suggest adding anything that would narrow the pipe. I'd suggest straight pipe with no baffle. The full length pipe will add some resistance due to its length but likewise work better with the bikes particular exhaust pulses by allowing the momentum of the exhaust help to create a negative pressure towards the end of the pipe. Doing a slash cut on the end will increase the exit area of the pipe. I know that is now the look you are going for. Just some info that might be helpful. Think of the 650 engine as a single cylinder cut off from a 318 ci V8. Then research what intake/exhaust mods improve that motor, such as effect of intake runner length, long tube vs short tube headers, etc. Much of it will translate over to the 650. |
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Title: Re: Another exhaust question... Post by A-Bolt on 01/21/13 at 09:05:18 Short strait pipe fix. I like the little short off road Super trap muffler/sparky. Very adjustable back pressure and sound. cheap used/200 new. |
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