aaen pipes

[jd82]

Hi guys I am looking for a set of aaen pipes for my 82 liqufire or is there any other brand of dual pipes out there?
Thanks

[sledder670]

Best bet is just buying new ones from aaen. i did buy a used set from an invader but they arent a perfect fit. I think I was told psi made some as well but not for sure. watch ebay they do pop up i paid 200 plus shipping

[nick80lf]

Rumor has it adding tuned pipes without doing porting work will actually lower your horse power. I've never tried it, so I can't talk from experience.

[JoeRainville]

Aaen pipes for both generation Liquifire's are still available new from Aaen Performance. Going from memory, I do believe they are tunned for 9,000 RPM and will work best with port work. "I don't think" they will lower performance on a stock motor, but you will need clutching and port work to take full advantage.

Peter from "That Girl Racing" has way more tuning experiance than I, and would be able to give a better answer on the effects of pipes on the stock LF motor.

I hope this helps,
-Joe

[jd82]

Thanks for the replys guys I am in search for a pair of these. But it kinda sounds like its better to stayto with mystock pipe, I have done clutch work already to it so I wouldnt half to do that.

[Matt]

Thanks for the replys guys I am in search for a pair of these. But it kinda sounds like its better to stayto with mystock pipe, I have done clutch work already to it so I wouldnt half to do that.

You probably still would for it to be effective. The idea is to tune the clutch to the powerband of the pipe.

[That Girl Racing]

This pipe/exhaust port/ rpm thing is very difficult to understand and even more difficult to explain. There are a couple of rules that apply. All things equal a short pipe runs at a higher rpm than a long pipe. When the piston is on its way down after ignition and the exhaust port is uncovered ,the exiting exhaust creates a sound wave that travels down the pipe at a high rate of speed. It also scavenges a fresh charge of fuel/air out of the crankcase. At a point halfway down the last cone of the pipe that sound wave bounces back down the pipe. If everything works out (length is the most important thing here) that sound wave will arrive just in time that the exhaust port is starting to reopen and will force the fresh charge that it scavenged out of the case back into the combustion chamber under pressure. This is the supercharging effect of the two-stroke expansion chamber. If the pipe is too short and the port is too low, which is the case of a stock Liquifire cylinder with 9000 rpm pipes, the reflective charge comes back too fast and hits a blocked exhaust port. The supercharging effect is minimal and the scavenged fresh charge is wasted and goes out the pipe. There are a million other factors in the scavenging of a two-stroke engine but that is a very simple explanation. If you lighten up a Liquifire clutch to run 9000 rpm it may get some of the supercharging effect but the lighter clutch has much less push so the sled is slower. If you just run the 9000 rpm pipe at 8000 with stock porting it just becomes a glorified straight pipe with very little of the expansion chambers benefits. But.. it does sound faster!

[tjsdad]

I had AAEN pipes on my 81 and honestly it felt way slower than the stock pipe. I even clutched it with thundershift adjustable weights with most of the weight on the tip. I revved it at 9000, and also geared it down a tad. Still felt slower. I also have had bad experiences with piped Polaris' and crank bearing failures spinning engines that much, and decided to tame it back down. They do sound great, but no power gains there, sorry. There is a youtube video of mine with pipes.

http://www.youtube.com/watch?v=u5ohLY3gG-w

[ljm]

This pipe/exhaust port/ rpm thing is very difficult to understand and even more difficult to explain. There are a couple of rules that apply. All things equal a short pipe runs at a higher rpm than a long pipe. When the piston is on its way down after ignition and the exhaust port is uncovered ,the exiting exhaust creates a sound wave that travels down the pipe at a high rate of speed. It also scavenges a fresh charge of fuel/air out of the crankcase. At a point halfway down the last cone of the pipe that sound wave bounces back down the pipe. If everything works out (length is the most important thing here) that sound wave will arrive just in time that the exhaust port is starting to reopen and will force the fresh charge that it scavenged out of the case back into the combustion chamber under pressure. This is the supercharging effect of the two-stroke expansion chamber. If the pipe is too short and the port is too low, which is the case of a stock Liquifire cylinder with 9000 rpm pipes, the reflective charge comes back too fast and hits a blocked exhaust port. The supercharging effect is minimal and the scavenged fresh charge is wasted and goes out the pipe. There are a million other factors in the scavenging of a two-stroke engine but that is a very simple explanation. If you lighten up a Liquifire clutch to run 9000 rpm it may get some of the supercharging effect but the lighter clutch has much less push so the sled is slower. If you just run the 9000 rpm pipe at 8000 with stock porting it just becomes a glorified straight pipe with very little of the expansion chambers benefits. But.. it does sound faster!

Thanks for that explaination. I could not wrap my head around that concept before. That is by far the best explanation I have heard.

Lloyd