We are tinkering more with the 1 litre mod hydroplane, have found the limits of what can be done with the 1200 wet pipe.Are into a hull this season that will handle the power safely(phew!) and are currently developing a dry single pipe/manifold combo to go with the new top end layout we've schemed up to make even more power. Just so no one thinks I am looking to steal secrets...this is NOT for a turbo, not even for a sled so the power characteristics we are building are completely different and we are forced to use a single expansion chamber. Have talked with most of the big name and old school single pipe guys(sled and pwc) and there is definitely a lack of mathmatical process to this, was just curious if some of you had found any short cuts in development. Heres what I already know-the manifold length/design is key and with the cylinder spacing of a polaris w/c its pretty much impossible to build the "perfect" manifold.(for a wide useable powerband any way!) We've settled on a manifold design that we are fabbing currently. I've worked up a tuned length based on what we learned last season testing several "production" single pipes from various applications that will be the starting point of the pipe. I'm taking a few ideas from a friend in the pwc industry also and working them into the equation. We are also going to play with a couple mods on the wet pipe as well but are pretty limited due to the double walled areas of that pipe.
I'm curious to try and manipulate the chamber find the sweet spot that works along with the signals from two open exhaust ports and get it all to work in harmony in this application. also have exhaust valves on the new motor to add another tool to the bag.balance tubes,water injection etc-so much cool stuff to tinker with!
Alot of what we've learned over the years about building a pipe per cylinder doesn't apply here-thats what makes it most interesting to us.
So how about it, any input?
curt
