Rear Exhaust for only a couple $$

[redhatman]

Ok, got this idea... what if you just took some type of tubing like the same diameter as the exhaust hole on the pipe and then ran the tubing out the back end and secured it? It would be like an exhaust deflector except you could make it come out of anywhere on the truck. It would be the same diameter as the exhaust outlet, so it shouldnt affect engine performance that much. Please tell your opinion on if this will hurt the engine, and also... would I need something that can withstand high temps? Thanks
-Pat

 

[beason]

it WILL change your tune and prolly hurt proformance a bit.. it may be the same size but its the length that will cause it to create more back pressure.. try this.. blow through a straw.. now cut the straw really short. (like 1 inch long) and blow again.. which is harder..

 

[Tarant]

you should be fine. as long as you stay less then 4-6in of tubing also if you get some tubbing that is a bit larger but still small enough that you could still attach the tube to the stinger with a zip tie. that will help also.

I did it with my Maxx and it was fine no tunning issues and no other real problems. you may want to shorten you pressure line about an inch that way the pressure will not be as great (that is just what i did, did it help I dont know but I was able to run fine)

 

[truthseeker]

Dangerous ground there, man. RC engine exhaust happens in pulses, which translates to frequency, depending on RPM. Tuned pipes are called that because they are designed to have just the right amount of back pressure at a certain rpm. It has to do with pressure waves and a lot of other complicated stuff. Too much or too little pressure is bad, hence the phrase "on the pipe". That's when everything is just right for that motor/pipe combo. The volume of air inside the pipe makes a lot of difference. Take away or add to that volume and things get funky. It also needs an open area for the pressure to expand into to get the resonance timed right and create the optimum back pressure. Straight tubing gots none of that, cuz. Will your motor explode? Nope. Will it run like the sweet pootang? Nope.

 

[4u2nv]

With my maxx (Pro. 15) just a normal exhaust deflector would make my engine overheat. (Granted them engines always run warm) but that put it over the edge. So Id imagine this would do the same.

 

[2mcgrath]

i agree i wouldnt do it..you could try it and see what it does just keep an eye on everything

 

[redhatman]

Hey, was watching some vids and found this one: http://www.rcpics.net/view_single.php?medid=68494 at about 3 minutes 48 seconds it shows one of the guys savages with it on it. Exactly what i was talking about. LMK.
-Pat

 

[ZANDOR]

Don't waste your time..
Search barn burner exuast...Its a waste of time

Buy a real pipe and be done with it.

IMO this post is worthless!

 

[Got Nitro?]

What about taking the exhaust diameter size and mutilpy it by 2,that should fix some back pressure prob's

 

[1500valk]

I have a rather "exotic" exhaust setup on my Savage. Did not change the tune one iota. however, it did lower the noise level by a pretty good amount.

 

[evan811]

with out an exauts pipe, the engine would be way to loud....

 

[4u2nv]

noone said anything about running without a exhaust.

1500 doesn't that stuff fall off alot? Just curious. Kinda looks like a homade tsais pipe

 

[redhatman]

wow valk, thats awesome. Does it fall off ever? also ,where did you get that extension?

 

[4u2nv]

Not to be a jerk, I'm just curious, but why bother with it? Is there a reason your messin with it or just bored?

 

[evan811]

what is that thing?

 

[redhatman]

Not to be a jerk, I'm just curious, but why bother with it? Is there a reason your messin with it or just bored?

well, I am kind of bored but the main reason is because I just wanted to try something new. Because I saw a video of a guy that had it like that. But wasn't sure if it was what I thought or if it would work and not damage my engine or performance.

 

[rocknbil]

Some of you guys are completely missing the question.

He's not saying REPLACE the tuned pipe with a tube. That would be a big mistake, yes.

He's saying put a tube on the STINGER.

As mentioned, so long as it's the same diameter as the stinger (or larger) it will not affect the performance in any detrimental way. The backpressure and resonance occurs within the pipe, anything after the stinger won't affect the pipe's tuning in seriously so long as it doesn't constrict the exhaust. You also have to be sure any excess oil doesn't pool in your turbe and clog up airflow.

BTW it's not just backpressure in a tuned pipe that enhances performance, it's the actual sound waves generated by the pitch of the engine noise combined with the shape of the pipe, google for tuned pipe theory - it's actually very cool.

The only thing you need to watch for is that it doesn't crimp or pinch in any way. Seen some guys with tubes hanging down come off a jump, the drain tube hits the ground, bends and pinches the line shut, and poof kills the engine.

 

[redhatman]

wow, thanks for all the info rocknbil very useful. And thanks for clarifying that to some of the guys. Not sure if I should do it or not. If I come across some tube sometime, ill pick it up and try it but I'm not in to much of a hurry.
-Pat

 

[1500valk]

wow valk, thats awesome. Does it fall off ever? also ,where did you get that extension?

Not sure about falling off, I haven't run it that much. But, that pic was the "prototype" stage. It's on there pretty good, now. The extensions are dubro .90 exhaust deflectors, made for planes. I had a similar setup on my Nitro MT, without the post-muffler, and it never fell off after I got it situated properly.
My reason for doing it was to quiet it down. It was way way way too loud for neighborhood use. That muffler is actually made for boats, made by Prather. They (prather) were pretty impressed with my noise reduction numbers when I sent this the info on it.