|
|
Post by racingelvis on Oct 7, 2008 16:05:13 GMT -6
thanks for all the info, but like i said we all know the 73 exhaust was pretty restrictive. thats is why i had asked if you could run the 72 exhaust BUT THEN YOU ACCUSED ME OF WANTING TO CHEAT RIGHT AWAY!!! YOUR THE SNAKE lol i am just kiddding. i would assume the 73 nitro was heavier, do you know how much though. enough to make a differnce you think?? i would think a 73 nitro with 72 exhaust would out run a 72 nitro sled for sled. no mods, all stock except for the exaust, each one tuned and clutched correctly. b.s.
|
|
|
|
Post by onlyhere4themoney on Oct 7, 2008 17:11:08 GMT -6
By the way the best race sled is the sled that wins that day.
|
|
|
|
Post by pathfinder on Oct 7, 2008 17:31:37 GMT -6
Speaking of weight in Nitros (72 and 73) I noticed obviously the rear skid on the 72 is all steel and the 73 has aluminum rails. Is the 73 skid significantly lighter than the 72? And if so are they interchangeable? I have a 72 400 Nitro that I just found that is rough (motor stuck, havn't gotten into it yet) and I have a spare 72 440 Nitro motor that I will probably put into that chassis if the 400 turns out to be a major fix. Also have a couple of 73 parts sleds, one of which has a complete rear skid in good shape that looks so much more refined than the 72, that I was wondering if it would be worth it to try and change it? I'm adding a pic of two not so perfect Rupps I ended up driving 1000 miles round trip to pick up. Went through New Hampshire, Vermont, New York, New Jersey and a little of Pennsylvania and then back. Hate to admit it but I left home 10 PM Saturday night, drove all night to PA. and was at a nice ladys house rousting her out of bed at 8 AM, packed up these two gems, had breakfast and drove home arriving at a 10 PM.  Extreme? Yes! But I really wanted a '72 400 and this was one of the few I have seen this way in a long time, and it is fairly complete except for a rear axle and cogs.  Opinions? (other than insanity)  pathfinder   |
|
|
|
Post by romanowski on Oct 7, 2008 20:00:21 GMT -6
The best thing you can do for a tohatsu fan nitro is pull the rupp kidney weight clutch and smash the shit out of the worthless thing. Dan's 72 nitro the waconia cup winner is a 72 throughout other than a 73 ignition and my clutching, the sled is super quick, i wont go into numbers on here because different timing setups differ on the #'s. This is what i can say about it though, Dan has a 75 f/a 340 oval racer what is a competitive sled, and the 72 nitro will outrun the f/a everytime, it's at least 2 sled lengths faster in 500 feet, my 440 trail twister which won stock "D" at waconia last year, has it's hands full when we test side by side, yes the merc has a little more mustard than the 72 but they are close, a slight screw up on the merc and the rupp will outrun it.
|
|
|
|
Post by snikr on Oct 8, 2008 11:43:23 GMT -6
Nice sled Pathfinder. Only one problem. Why didn't you stop by on your way through Vermont??
Tom
|
|
|
|
Post by pathfinder on Oct 8, 2008 16:04:44 GMT -6
Nice sled Pathfinder. Only one problem. Why didn't you stop by on your way through Vermont?? Tom Next time through! Could be any second at the rate I'm stackin' up Nitro's. pathfinder |
|
|
|
Post by snikr on Oct 9, 2008 11:00:35 GMT -6
You can ALWAYS leave me a couple of Nitro's if you'd like. A 72 would be best...not that I'm asking for much.
Tom
|
|
|
|
Post by pathfinder on Oct 9, 2008 11:41:00 GMT -6
You can ALWAYS leave me a couple of Nitro's if you'd like. A 72 would be best...not that I'm asking for much. Tom '72's are tough to find back here in the East! Not like all the "72's that keep fallin' out of the woodwork out in the middle of the country. That's why I got a little "obsessed" driving a short marathon to get that one. It was a long way and a pain in the butt, but now that it's in my garage it was all worth it! I now have a decent "72 340 Nitro (thanks to Bill Stull) and a soon to be nice '72 400, (2) '73 295 Nitro's, (2) '73 440 Nitro's and a bitchin 70 34 Sprint. It's a friggin' disease! pathfinder |
|
|
|
Post by snikr on Oct 9, 2008 18:01:44 GMT -6
Where you from Pathfinder?
|
|
|
|
Post by pathfinder on Oct 10, 2008 7:00:56 GMT -6
Where you from Pathfinder? I come from the home of the largest snowmobile club in the country (4400 members) The Pittsburg Ridge Runners. Pittsburg, New Hampshirepathfinder |
|
|
|
Post by rupprat on Oct 10, 2008 8:44:26 GMT -6
You can ALWAYS leave me a couple of Nitro's if you'd like. A 72 would be best...not that I'm asking for much. Tom '72's are tough to find back here in the East! Not like all the "72's that keep fallin' out of the woodwork out in the middle of the country. That's why I got a little "obsessed" driving a short marathon to get that one. It was a long way and a pain in the butt, but now that it's in my garage it was all worth it! I now have a decent "72 340 Nitro (thanks to Bill Stull) and a soon to be nice '72 400, (2) '73 295 Nitro's, (2) '73 440 Nitro's and a bitchin 70 34 Sprint. It's a friggin' disease! pathfinder I just aquired a '72 Nitro 295 ;D If anyone is interested, I know where there is another one. A 340....needs lower panels If you are serious, send me a PM. |
|
|
|
Post by snikr on Oct 10, 2008 10:40:47 GMT -6
Ship it down to me Rupprat.
|
|
magnumforce
Administrator'
{S=0}
NEW EMAIL ADRESS:ruppster@ymail.com Microsoft took away my hotmail account after 12 years, so....
Posts: 1,423
|
Post by magnumforce on Oct 12, 2008 21:39:35 GMT -6
|
|
|
|
Post by rupprat on Oct 24, 2008 10:22:25 GMT -6
The best thing you can do for a tohatsu fan nitro is pull the rupp kidney weight clutch and smash the $h*t out of the worthless thing. Dan's 72 nitro the waconia cup winner is a 72 throughout other than a 73 ignition and my clutching, the sled is super quick, i wont go into numbers on here because different timing setups differ on the #'s. This is what i can say about it though, Dan has a 75 f/a 340 oval racer what is a competitive sled, and the 72 nitro will outrun the f/a everytime, it's at least 2 sled lengths faster in 500 feet, my 440 trail twister which won stock "D" at waconia last year, has it's hands full when we test side by side, yes the merc has a little more mustard than the 72 but they are close, a slight screw up on the merc and the rupp will outrun it. Anyone have a suggestion as to the best clutch to use once you smash the $h*t  out of the Rupp clutch? Thanks. ;D |
|
|
|
Post by romanowski on Nov 2, 2008 17:57:04 GMT -6
The best thing you can do for a tohatsu fan nitro is pull the rupp kidney weight clutch and smash the $h*t out of the worthless thing. Dan's 72 nitro the waconia cup winner is a 72 throughout other than a 73 ignition and my clutching, the sled is super quick, i wont go into numbers on here because different timing setups differ on the #'s. This is what i can say about it though, Dan has a 75 f/a 340 oval racer what is a competitive sled, and the 72 nitro will outrun the f/a everytime, it's at least 2 sled lengths faster in 500 feet, my 440 trail twister which won stock "D" at waconia last year, has it's hands full when we test side by side, yes the merc has a little more mustard than the 72 but they are close, a slight screw up on the merc and the rupp will outrun it. Anyone have a suggestion as to the best clutch to use once you smash the $h*t out of the Rupp clutch? Thanks. ;D |
|
|
|
Post by romanowski on Nov 2, 2008 18:02:07 GMT -6
The clutch has 3 round holes in the cover, the weight and ramp profile can be changed independantly, and most people think it's as much of a pile of crap as the rupp clutch. At least this notion is helping keep some nos parts still around for them.
|
|
|
|
Post by bankRUPPt on Nov 2, 2008 18:59:59 GMT -6
LOL...
The hex clutch is much better than the Rupp clutch. If you keep new bushings in it, it should be just as good as a Comet or Polaris clutch. It basically shifts the same as Ski Doos TRA clutch that is still being used in today's sleds.
Although the fact that the weight and ramp profile can be changed independently doesn't give it a tuning advantage, it does make it sound really high tech!
|
|
|
|
Post by nitrofa340 on Nov 2, 2008 20:20:19 GMT -6
LOL... The hex clutch is much better than the Rupp clutch. If you keep new bushings in it, it should be just as good as a Comet or Polaris clutch. It basically shifts the same as Ski Doos TRA clutch that is still being used in today's sleds. Although, the fact that the weight and ramp profile can be changed independently doesn't give it a tuning advantage, it does make it sound really high tech! For some reason I get the impression Ed is not a big hex clutch fan. |
|
|
|
Post by onlyhere4themoney on Nov 2, 2008 21:22:18 GMT -6
LOL... The hex clutch is much better than the Rupp clutch. If you keep new bushings in it, it should be just as good as a Comet or Polaris clutch. It basically shifts the same as Ski Doos TRA clutch that is still being used in today's sleds. Although, the fact that the weight and ramp profile can be changed independently doesn't give it a tuning advantage, it does make it sound really high tech! Sorry Ed but you are wrong about the tuning. there is an advantage having the fly weight and ramps seperate. |
|
|
|
Post by bankRUPPt on Nov 3, 2008 21:35:28 GMT -6
C'mon Dale! I said it was just as good as the Comet style. As long as the HP was low enough that the clutch could handle it, that is!
.....Rick....
The clutch works by the weight overcoming the force of the spring and the load of the belt against it. That's it. Doesn't matter how you apply pressure to the face of the moveable sheave.
The shift profile is set by a the ramp on the hex. The weight will have an effect across the whole pattern. If you need to make an adjustment to any given area of the profile you have to re-shape or use a differnent ramp. On the comet the shift profile is set (for the most part for any given style of weight) and to make an adjustment you would add or remove weight at the given area of the weight to make the change.
Both are pretty much infinitely adjustable from disengaged to full shift. So how can one be more tuneable than the other? The flyweight design is easier and faster to make changes to.
|
|
