2 stroke exhaust

[K-fab]

Originally Posted by trojan

Mate, I roll-up and pipe but I doubt it will help.

[renegadespec1]

trojan don't be a smartass...do some reading...I have alot of experiance rolling up 2 stroke pipes....Java pipe is old news and doesn't cover sled engines...Maybe you should buy a roll.... AND PUT YOUR MONEY WHERE YOUR MOUTH IS...165 hp on the DYNO...nuff said

[trojan]

I beg your pardon. I appreciated your humour and I thought I was just expressing that appreciation... guess not. While it's true I don't have your experience with 2 stroke pipes, I fail to see the significance of it being a sled engine? Care to learn me somefin'?

[renegadespec1]

Trojan,
I went back and read trough the posts...and that was funny I just missed it...sorry
The java program is a great starting point, but sled motors turn a lot slower than most 2 strokes...example...chain saw...13,500...old 125 dirt bike 10,000...I don't know what the cox toys turned at but I'm sure it was 11,000 or better...Twin Sled motors are are all done at 8000 and under, you can spin a tripple over that but the clutches don't like it...The Java program was designed for a motor that will fit in the palm your hand...not for a motor that has a piston the size of your fist. I spent a boatload of time researching the air flow,shock waves and refractory pulses,and resonance before starting to roll my own pipes...I do use the java on the singles I build,as a baseline. I have a freind,whose into the nostalgia sled racing, the last motor we built for it went 78mph on the ice, it was a whopping 214 cc's pulling a 300 pound sled plus rider...No sno speed record but I thought pretty impressive for a sled Built in the early to mid 60's that had a top speed of under 30mph...getting the dimensions isn't that hard...Java has a good animation...The one thing that most guys have trouble with is the transfer port timing...I have miscalculated that on several attempts to build pipes...the peak goes one way or the other in a big hurry...one digit off and the pipes are junk....I fought with using stock pipes and hacking them up for years...since the 80's...I used to order up tuner pipes from PSI and cut them up to get the bends and the tuned pipe...I found it to be way easier to just roll the cones and belly, using the head and tail pipes to do the bends I need to fit them in the buggy...BTW..it does help, if you design the cage to accomodate the pipe area

[weasel]

Originally Posted by renegadespec1

Trojan,
I went back and read trough the posts...and that was funny I just missed it...sorry
The java program is a great starting point, but sled motors turn a lot slower than most 2 strokes...example...chain saw...13,500...old 125 dirt bike 10,000...I don't know what the cox toys turned at but I'm sure it was 11,000 or better...Twin Sled motors are are all done at 8000 and under, you can spin a tripple over that but the clutches don't like it...The Java program was designed for a motor that will fit in the palm your hand...not for a motor that has a piston the size of your fist. I spent a boatload of time researching the air flow,shock waves and refractory pulses,and resonance before starting to roll my own pipes...I do use the java on the singles I build,as a baseline. I have a freind,whose into the nostalgia sled racing, the last motor we built for it went 78mph on the ice, it was a whopping 214 cc's pulling a 300 pound sled plus rider...No sno speed record but I thought pretty impressive for a sled Built in the early to mid 60's that had a top speed of under 30mph...getting the dimensions isn't that hard...Java has a good animation...The one thing that most guys have trouble with is the transfer port timing...I have miscalculated that on several attempts to build pipes...the peak goes one way or the other in a big hurry...one digit off and the pipes are junk....I fought with using stock pipes and hacking them up for years...since the 80's...I used to order up tuner pipes from PSI and cut them up to get the bends and the tuned pipe...I found it to be way easier to just roll the cones and belly, using the head and tail pipes to do the bends I need to fit them in the buggy...BTW..it does help, if you design the cage to accomodate the pipe area

wow, I was wonderin' about you when you made your first post,, I had a feelin' "this guy knows somethin". I'm so impressed with someone that knows
that kinda work. I studied it for a time but Geez, it was a brain buster as a part time project,, I started too late I guess.

I didn't get into the gas engine's much, all my engine work was with Nitro/Methanol boat engines, specifically the "least liked" 3.5cc O/B boat engine made, the Thunder Tiger. I have modified that engine for boaters all over the planet, cut crank induction window, cut sleeve ports and made volume specific head buttons and just totally turned the motor into full blown competition for the best engines made in that class for 1/2 the price of the best.

It's so sad to see the two stroke engine losing its footing the way it has, they are so stunning in they're power delivery for they're size.I have lived next to Devils Lake all my life where full size boats come to set National records. The Pro Modified O/B class was just Unbelievable, tuned piped, runabout boats with fairly small displacement motors on them going over 130mph. My first ride on the Yamaha RD400,, first ride on an early Yamaha SRX L/C would paste a permanent smile on anybody living,, those were terrific days, I will never forget it.

[bdkw1]

Originally Posted by weasel

My first ride on the Yamaha RD400

Hey, I had one of those. Better know to My friends as the Rapid Death 400 as it was a toss up who would die first, the motor or Me.....

I got Grahm Bells 2 stroke tuning book and went nuts on that thing. Sometimes I miss that wobbly POS.....

[LiveWire]

Originally Posted by bdkw1

Hey, I had one of those. Better know to My friends as the Rapid Death 400 as it was a toss up who would die first, the motor or Me.....

I got Grahm Bells 2 stroke tuning book and went nuts on that thing. Sometimes I miss that wobbly POS.....

I once slid on the pavement behind one of those.

[K-fab]

[weasel]

I talked with Joe on the phone yesterday, I think he needs some examples on how to get the stock sled pipes in the buggy and various other sled componet install's.

[weasel]

Another one, I flipped the stock sled pipes upside-down in the first pic Joe. Was the only way they would fit without modifying them.