moparmadman40 Posted July 26, 2013 Report Share Posted July 26, 2013 Hey guys, i was wondering if a few of you could help me out on some pipe tuned lengths as a starting point. I am currently building a banshee powered, KTM framed, Timbersled snowmobile track kit, monster of a bike! I am working with a ktm 300 pipe and building it into a 2 into 1 system something like what Dynoport is offering. the problem is that i don't have a normal set of banshee pipes to get a starting point for the tuned length. would a few of you be able to offer up some advice on a starting point for a tuned length of regular banshee pipes, and if i'm lucky.... one of you out there has a dynoport or similar single pipe that could also give me a measurement! If it makes any difference to anyone with alot of experience, the bike is going to be a stock bored cylinder, lowered timing .015" and i am planning on putting in a 4 mil stroker crank and it will likely be a 2 into 1 carb setup. Thanks Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted July 26, 2013 Report Share Posted July 26, 2013 Mountain Donkey FTW Quote Link to comment Share on other sites More sharing options...
LCW Posted July 27, 2013 Report Share Posted July 27, 2013 Your port timings will be way different from what you want to do with .015. If you plan on doing a 4mil have the cylinders ported for that by a sponsor on here. As far as pipes I take it you are trying to build your own? I would get into contact with someone like Shearer or Jim at Passion. They have plenty of pipe experience. I wouldn't recommend a 2 into 1 carb setup with a 4 mil either. Quote Link to comment Share on other sites More sharing options...
So Cal Suspension Posted July 27, 2013 Report Share Posted July 27, 2013 Your port timings will be way different from what you want to do with .015. If you plan on doing a 4mil have the cylinders ported for that by a sponsor on here. As far as pipes I take it you are trying to build your own? I would get into contact with someone like Shearer or Jim at Passion. They have plenty of pipe experience. I wouldn't recommend a 2 into 1 carb setup with a 4 mil either. FTFY Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted July 27, 2013 Report Share Posted July 27, 2013 a banshee powered ktm with a track on the back, got any pics? Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted July 27, 2013 Author Report Share Posted July 27, 2013 i have pics but have no idea how to post them, they are too big to attach and I don't know how to do it otherwise. Being a dirtbike I am kinda stuck in a bunch of ways by putting in a twin, I still may run dual carbs but space is going to be an issue which is why I might end up doing a single. I was thinking of a single carb off of a ski-doo summit 800 because they have the option of carb heaters. the pipe just plain and simple needs to be a single. and I wanted to stroke it to get a little more torque. Zillafreak, do you have these pipes? would you be able to get a rough measurement on the tuned length for me? I basically have the pipe already built from the engine back, but I want to know a starting point for the length so I can cut it now and try it out. I realize that it is probably going to be cut and tuned more than once but i'd like to be at least in the ballpark for the first try. If I can get it to work ok i'll run with it, but if I can't I might just have to send what I have away and get someone to build a new one that will fit in its place. Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted July 28, 2013 Author Report Share Posted July 28, 2013 TTT, come on guys. i really need a starting point Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted July 28, 2013 Report Share Posted July 28, 2013 I don't understand the use of the KTM pipe. Wouldn't it be far easier to buy a 2 into 1 Banshee pipe and modify it? Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted July 28, 2013 Report Share Posted July 28, 2013 You are on the correct path with using a water heated carb. You can block that shit on a sled but not on the mountain donkeys. IMO Id buy a dynoport 2:1 and mod that. Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted July 28, 2013 Author Report Share Posted July 28, 2013 the pipe is allready built basically. all i need is a length. the ktm pipe was used because it allready has the correct profile to fit a dirtbike where a banshee pipe would not. i had to add about an inch in the center of the pipe and i will need to add a piece behind the rear cone to match up with the silencer pipe. but i would like to adjust the length of the pipe at the rear cone before i finalize that. the only hint i have found on this entire site is a formula.... (EXH. Duration x 1700)/ pipe tuned length = RPM so this gives me about a 38 inch pipe for 8000 rpm peak Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted July 28, 2013 Report Share Posted July 28, 2013 38" of stinger tube you mean? Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted July 28, 2013 Author Report Share Posted July 28, 2013 38 inches from the exhaust port to the rear cone. sound right to anyone? Quote Link to comment Share on other sites More sharing options...
So Cal Suspension Posted July 28, 2013 Report Share Posted July 28, 2013 I don't understand the use of the KTM pipe. Wouldn't it be far easier to buy a 2 into 1 Banshee pipe and modify it? True, but then both pipes would be worthless as fuck. Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted July 29, 2013 Report Share Posted July 29, 2013 lol Quote Link to comment Share on other sites More sharing options...
camatv Posted July 29, 2013 Report Share Posted July 29, 2013 ok.. i'm really trying to understand this. from what i gather a dirt bike with a snow track on it? really why not just use a big ktm 4 stroke.... i think your wasting your time.. with a 4 mill jacked up porting and a screwed up 2-1 pipe and 2-1 carb i think you would be less than stock hp and tq ratings. thats around 40hpish not nearly enough to turn a track setup. you need TQ me thinkks Quote Link to comment Share on other sites More sharing options...
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