cant make it this year. Drivers Ashley and Erin will be out of state. Roger and Craig will be at the nvsrs race sunday in wausau wi. Going to try to get Roger to win the coveted wausau cup. Total points accumulated through out the day with class wins. Last year Roger was 2nd to Leah Tanner. We'll test and load this week. I'd sure like to go to Duluth though. Have a cabin not far from there. Its a good event. We have done well there in the past and have a great story about that. Ask me sometime. Tom
Post by pararailer on Sept 26, 2012 20:47:24 GMT -5
yea, I'll be there. I got this stingeroo ive been working on ready to go. Im pretty excited, I think it will do pretty good. I supose Roger has to continue the 71 super battle with Bob. that will be cool to see again. I will definatly give Roger a hand If he needs anything.
Post by pararailer on Sept 27, 2012 19:17:13 GMT -5
Thats a bummer you guys wont be there. I was just out on my new one testing in the yard. This thing ripps!! with a pararail and lil whip track under a short stingeroo, It pulls the skis up so high that I thaught it was going to flip over!! I have some payback for some yamahas from last year.
Thanks chris for helping Roger. He was one tired racer after sunday in wausau! Sounds like Duluth was kind of a "cluster". Thats too bad cuz its a great area and nice track. The safety program needs some serious attention before someone gets killed! The TKX he won with had an engine failure in wausau sunday. He made 2 finals but then it looks like it went lean. That engine was a "horse" all year. He finished 1 point behind Craig for the CUP. But were all happy with the CUP now in Star Prairie!
I enjoyed helping out Roger. All us scorpion guys helped each other out all day. The race managers did have some troubles. Ther was such a delay with the stupid lawn mower races every one was getting pretty upset. Buy the time we got to the finals most of the spectators had left. Next year Ill skip that one and go to the Brianerd race instead. We all were impressed with Roger handling all those heats alone. I think he raced 6 sleds! That guy is in great shape for his age! Congrats on the victory in Wausau. As for my sled, well I was a little disapointed. It seemed to go much better at the end of the day. I think that brand new lil whip track was so stiff it took several runs for it to loosen up. Did squeek into the finals in 440mod fan and it ran good then but not enough to take out the much newer sleds I was running with all day. This little thing will be a fun sled in the snow this winter! I suppose next year I should go back to my TK for the grass.
Last Edit: Oct 7, 2012 10:10:00 GMT -5 by pararailer
Post by mooreperformance on Oct 7, 2012 13:07:46 GMT -5
Lots of fun running a steel chassis sled with a 440 Sachs, tillotson carb and spring loaded roller clutch but not to practical. The ports on a 440 Sachs are pretty mild. Back in the day (1971) the 440 Sachs was the most reliable and the highest quality engine available. Every bit as good as the 440 Axial Fan cooled Rotax. Miles ahead of the quality of a fan cooled 440 Yamaha and Polaris (they were not even axial fan cooled, they had a fan on the flywheel!).
We Scorpion guys (back then) new the handwriting was on the wall when the 1971 Arctic Cat Puma was made available with the 440 Sachs AND the 440 Axial Flow Kawasaki. That 440 fan cooled Kawasaki would beat the 440 Sachs pretty easily (if they could keep the chrome on the Kawasaki cylinders). Even the 440C Sachs (and there were a few of 'em in the Pumas) couldn't keep up with the Kawasaki Pumas. We also compared the Chapparal Firebird SS in 1972, it was available with either a 440C Sachs or the Chapparal Fuji 440 Axial Fan engine. Man that Fuji equipped Firebird SS would run away and hide from that 440C Sachs equipped Firebird SS. We Scorpion guys LOVED that 440 Sachs but we knew it wasn't a competitive racing engine after the 1971 snowmobile season was over. The axial cooled 440 Sachs was great compared to the old school "flywheel fan cooled" 440 JLO and the 438 Hirth but the porting just wasn't radical enough to compete with the Japanese engines (the 440 Sachs never had more than two transfer ports per cylinder).
The huge intake and exhaust ports and the booster transfer ports on the 440 Cuyuna (along with the Mikuni carb, stock tuned pipe and the lightweight aluminum chassis) would make the 440 TK pretty hard to beat. If you could install a Comet clutch and get it tuned just right you would have an extremely fast grass racer with a 440 TK Scorpion.
Can't see how any other stock fan cooled sled (Rupp, Chaparral, Yamaha or Sno Jet) would be much faster in a grass race!
With my experience the 440 sachs is such a great motor. With the donaldson muffler, it sounds so good and starts, ildes and has such a crisp response. But, I guess It just doesnt have the power of the rockwell jlo motors. I can only take it so seriously being 6ft1inch235lbs. I was born in 72. Its like horse jockeys, in grass drags the lighter guys win....
Last Edit: Oct 7, 2012 17:40:52 GMT -5 by pararailer
As far as grass racing, dont forget about the Mercurys and nitros. The exciters are always fast also. This year at Princeton, we had 4 good running tk's there and did not make the "D" stock final with any of them! 1 rupp and 3 mercs were the final.
Talking about the sachs engines, I thought the same about the ccw reed valve 400's. We built a great reed 400 and had big plans with it. All said and done, our slowest 400 jlo/cuyuna would spank that ccw. But it sure starts good, has great throttle response and sounds good.
Post by mooreperformance on Oct 8, 2012 11:14:24 GMT -5
Reed valve engines work great for low rpm trail riding (and motocross racing were low speed torque is needed). All reed valve engines have a long stroke and a small bore for torque. Unfortunately a small bore severely limits the size of the intake, exhaust and transfer ports that can be fitted into the cylinder. Not a problem with a low-speed reed valve engine but a bigger bore (and bigger ports) is better for a hi-rpm racing engine. I always think about air/fuel flow through a reed valve. What a huge restriction to flow! Kinda like putting a reed cage between a Holley four barrel and an Edelbrock intake manifold on a small block Chevy! Man would that screw up the flow! A reed cage between a Mikuni and the crankcase of a two-stroke is very similar. Reed valves are good for an outboard motor but not a hi-speed snowmobile engine. Modern snowmobile technology has advanced to the point were a high horsepower engine can be built with reed valves and low speed torque. If ultra high horsepower/high RPM was still the only goal, like a 1970's snowmobile racing engine, you would still want a piston ported or rotary valve engine.