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Capped Exhaust - Force to single side
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GP Racer
 
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Capped Exhaust - Force to single side - August 19, 2009, 02:18 PM

Since I have lost 1 exhaust Canister, and I am having trouble finding replacements. (Called Salvage yards, forums, ebay, CL) I am thinking about what to do in the mean time.

This idea came to me, and I am requesting feedback/thoughts. What if I clamped a cap onto the Left side exhaust port exiting the collector box, forcing all the exhaust to the right side? Would this cause bad things to happen?





My thinking is that the exhaust gas will follow the path of least resistance and just exit the right side Canister, but would this cause excess back pressure to build up and damage the motor?

What do you guys think?

Thanks!

-If I am mentally challenged in my thinking just say so, I will stop.


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August 19, 2009, 02:29 PM

I think it will cause excessive backpressure. It MIGHT work better if you cut the exhaust pipe down flush, then had someone weld a patch on it, essentially making it one pipe. That way you don't have a "Dead end" and exhaust gases are trying to reverse flow, to get out. Have you considered new exhaust all together?


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August 19, 2009, 02:36 PM

^agreed

but if you decide to cap it, i'd look into a proper tuning.

cap it and ride it around...see what happens...
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August 19, 2009, 02:36 PM

After doing some quick research.. it looks like a lot of people with your bike just buy an aftermarket can and have an exhaust shop fab a mid pipe. http://www.lmgtfy.com/?q=1983+VF750F+exhaust


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August 19, 2009, 02:38 PM

^ agreed

fatter pipes = more air flow

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August 19, 2009, 02:40 PM

I have a pipe for the 86 VF500f. It's in the original wrapper. No lie.
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August 19, 2009, 02:56 PM

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August 19, 2009, 02:58 PM

Thanks! And yes I have googled this for some time, a set of F1's disappeared off of Ebay 2 days ago... I would love to custom fab a setup for this bike, but I have no skill in welding or fabrication...

Nunya? Think we can make this fit a 750?

I also found a VF1000 set on Ebay which is close, 4 days till close!


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August 19, 2009, 03:12 PM

The exhaust shop will do the fab, you just need a set of cans, or can if you still want to do that.


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August 19, 2009, 03:15 PM

this one?

http://cgi.ebay.com/ebaymotors/1984-...Q5fAccessories

On your bike, what's the diameter of the inlet?
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August 19, 2009, 04:06 PM

If you need parts - check out davidsilverspares in the UK.. They can usually get classic honda parts easily - cheap for UK prices on parts - if you can find the parts in the states you can get em cheaper - but when you need a specfic OEM part that you can't find anywhere - they usually have it..

http://www.davidsilverspares.co.uk/parts/part_31290/


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August 19, 2009, 06:57 PM

Those 1000 pipes look pretty solid. IMHO if you are going to cross match, I would use a can from something bigger rather than smaller.


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August 20, 2009, 08:45 AM

Still waiting on items to close on aution, then will start some experimenting.

Anyone heard of or used Bassani Exhaust? I found a complete system on for an VF700F that I like, just never heard of the company. I looked them up and they exist, currently manufacture exhaust systems for cars and harleys. Mostly V8 american muscle (Mustang, Corvette).


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August 20, 2009, 10:22 AM

To answer the original question, you can cap it. It wouldn't hurt anything.

It might reduce power depending on how much flow the engine wants vs. how much you have with it all going to the one side. It might also increase power if 1 pipe is actually a better match to what the engine wants. An exhaust with a greater CFM capacity is not always better, especially when that capacity far exceeds the CFM output of the engine. You end up with slow, cold, heavy air in the exhaust, rather than fast, hot, light air.

There won't be any "backflow" from the other side being capped. There will be slightly higher pressure in that nub because there's no exit. That higher pressure (denser) area will just sit there, and the exhaust flow will just slide right past it to the single pipe. Much like you can float less dense liquids on more dense ones. Gasses are fluids too, so fluid dynamics apply.


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August 20, 2009, 10:56 AM

Quote:
Originally Posted by 1976mike View Post
Still waiting on items to close on aution, then will start some experimenting.

Anyone heard of or used Bassani Exhaust? I found a complete system on for an VF700F that I like, just never heard of the company. I looked them up and they exist, currently manufacture exhaust systems for cars and harleys. Mostly V8 american muscle (Mustang, Corvette).

I used to have a custom undertail exhaust on my TL that terminated with a Bassani muffler.

Here it is...



I dont run it anymore but I can tell you that the sound was nice and decently loud and it held up well over the years.


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