My mother in law gave me an old super junkie home made snowmobile trailer (she just wanted it out of her grove). Anyhow, I traded it site unseen for a Sting, which turned out to be a Blue Whip, still a cool sled, nice 6 bolt 440, very nice chasis, track, and drive train.
The steering was broke, had to remove engine, steering shaft, weld ,etc. Gave me a great chance to clean,and bond with it.
I been messing around trying differant motors. This is the old, old, 440 jlo free air found at Princeton. It came out of a whip oval racer, so I cleaned it up, carbs, timing etc. Darn thing starts right up, and runs pretty good. I doubt if I would ever actually campain this race engine, especially without proper hood scoops and air ducting.
I believe the 440 FA was never actually used in anything, it's only value would be as a novelty, or possibly parts to interchange with the 650FA as used in the King Kat.
I been ripping around the yard a bit with it, and it does pull pretty good, and will start with just a 1/2 wrap of rope!
Trying to post a video of the thing running,reving, smoking, and stinking up the hole garage type deal, but failed. Can we post a video from photo bucket?
Next in line is a Rotax 503. Another engine I restored a few years ago, and never got around to using. Can't wait to see if it will spin the track on an ol,Whip! Plan on using the Skidoo Safari exhaust to start with, and then try an AAEN Phazer pipe (they seem to work on everything)
I am thinking the FA would be a good motor for a 71 Super Stinger, I think the pipes would wrap around and fit with minimal adjustment, just gotta find a FA hood and chassis. I have a stinger III, and a II, I guess I could cut and chop ? Not really looking for any new projects right now.
The blue whip is in great shape, and if I remember right, they were great trail sleds, so it will eventually get the original motor, clutch etc back in.
For now we are just having fun with it trying different stuff.
I have a Wheel Horse Safari Wide Track hood and belly pan, which appears would fit quite nicely on this chassis, along with a freshly built 503? ( possible sleeper?) I was thinking about using the old handle bars off of the Wheel Horse for further disguise
The only thing holding me back is I can't find a Wheel horse seat.
They are AAEN pipes, I have no idea what they are supposed to fit. I am always looking for pipes at swap meets, got lucky one day and found the set which are being used on the free air Bubble.
Then, last year at Princeton, I found the FA 440 motor, and it came with the pipes in the picture, which happen to be the exact same pipes I found earlier at Douglas. Keep digging, and looking, something will pop up.
Post by pararailer on Dec 12, 2014 11:18:43 GMT -5
Weverat, what are your thoughts on the basic principles of tuned expansion chamber pipes? Too long too, too short, skinny, wide? How do they effect power? I'm sure the wrong size pipe would hurt power. I under stand that is a scavenging effect to sort of pull the exhaust gasses out quicker. Just wondering?
Post by pararailer on Dec 12, 2014 11:21:36 GMT -5
I've heard that the early scorpion pipes were not tuned at all. Just slapped on with no science behind them. I would guess that a twin inlet Donaldson muffler would make more power than the y pipe and scorpion expansion chamber.
Wow, tough one, the tuner pipes are definetly a black art, I just plug and play, hope, and adjust.
Lots of adjustments available if you don,t mind cutting and welding. Header, mid section, and stinger length is all I have tried. Of course it really is about testing, one adjustment, test again. Sometimes it is darn hard to figure if things are getting better or worse, a dyno would help.
The Donaldsons make good power. I have two exhaust set ups for the Stinger II ice dragger (4 bolt). The first set up is a Y manifold from a 6 bolt motor, moded to slip onto the 4 bolt cylinders with a short flex pipe to a Donaldson.
The other is two flex pipes to a dual inlet Donaldson. They both work, no differance. But remember I am using a nice Y manifold, not the old F pipe.
What I want to try is two single inlet Donaldsons, as the singles have a bigger megaphone stuffed inside the oval shaped midsection.
You ever cut one open ?
Last Edit: Dec 12, 2014 18:36:56 GMT -5 by weverat
So parailer, you have a dual inlet donaldson for our range whip? That thing would rock and be quiet if we got rid of them loud pipes. Right?
O come on obj1, I'm not talking about the later sting pipes I'm talking about the 70 stinger style. My Grampa told me when he got his 340ccw 71 free air, 340s came wuth a single expansion chamber, they told him to adjust the flex pipe length for performance. That sounds like a bunch of bs to me. From what I understand, a y pipe is very power robbing compared to twin pipes. Even a twin inlet Donaldson would be better than that. Wouldn't it? Craig's range whip with twin tuned pipes is in a different category.
Last Edit: Dec 12, 2014 20:09:52 GMT -5 by pararailer
Post by pararailer on Dec 12, 2014 20:36:13 GMT -5
Ok, I just did a google search on expansion chamber principles. Basically it has to do with the pulse created to push back unburned gas back into the cylinders.
Post by pararailer on Dec 12, 2014 20:54:44 GMT -5
So basically an expansion chamber is like a big pressure can that is ment to hold the unburned gas in the engine longer? Weird! sort of a exhaust valve with no mechanical parts.
That pipe stuff is interesting thats for sure. Also,pipe temp is so important.when the pipes get to the right temp the power increase is very noticeable. The dual inlet Donaldson are cool but I also like the sound of the 72 440 jlo,s. Skiwizzer once showed me the internal difference of the donaldsons. He did some air flow work at Donaldson way back when.
Then first pic is the exhaust as used on the 4 bolt ice racer, a bit of a cheater, but I had to get rid of that nasty restrictive F pipe. This made a difference, and really seamed to wake up the motor.
The nicely painted black manifold I believe is from a Sting ? The one with the 90 degree bend is 1976 Whip.
Cut away view of what I thought was a Sting pipe, but not sure because it does not seem to have enough bend to fit the strait manifold, I think it goes with the slightly angled manifold. I am thinking the Sting pipe is the same, I wish I had one to cut open.
Click on the pic to make it big, and then click again for bigger yet, and you can see these are quite the heavily engineered baffled up Scorpion tuner pipes.
Here is a six bolt shoe horned into an old Massey, Charlie moded the F pipe to fit ( Stock Appearing) I am guessing this little mod de - tuned the crap out of that nice little motor. He really did not have much choice though with the forward mount engine etc.
Last Edit: Dec 13, 2014 18:25:49 GMT -5 by weverat
