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Post by moofus02 on Jun 17, 2014 6:12:28 GMT -5
The european MXers used right iggys a lot,also the CR as well as the YZ used that setup in the early 80's..An engine could be swapped to the other side,but it'd be a bunch more work... One more thing for my boy to find for me when he gets to Germany lol Sent from my SPH-L720 using proboards |
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Post by Lucass2T on Jun 17, 2014 8:59:21 GMT -5
Lucass, I showed the crank mods to adapt the variator shaft from a donor GY6-150 crank to the YZ125 crank wheel on page 2 of this thread.I tried a heat/shrink fit at first,but that was a failure..An old machinest friend said a press fit would do very well so I did that method,it worked great!If you would like any other info,I'll gladly share.. John True, missed that part i guess. Is the press-fit working? Don't you think something like splines or a key (like flywheels are fixed) are necessary? And why did you specificly need a right hand ignition motor? Wasn't turning the crankcase upside down and rotating the cylinder 180 degrees an option? Than your range of engines would be much greater. |
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Post by 190mech on Jun 17, 2014 9:17:01 GMT -5
Flipping an engine reverses rotation,places the induction on the bottom and flipping a cylinder is not easy as the studs are offset and transfer tunnels shaped for max flow wouldnt line up..Add that to the rest of the tasks and it gets to be a HUGE project!!
Crank shaft big end pins are not splined or keyed,just a strong press fit.I figured if it works on the big pin,it'll work on the drive splines too!
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Post by 2strokd on Jun 17, 2014 9:54:49 GMT -5
Its a good idea though! Flipping the engine over...
Isnt it amazing that our engines stay together with the main components just pressed together with a "pinch fit". Still amazes me!
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Post by moofus02 on Jun 17, 2014 10:14:45 GMT -5
With a motor flipped with intake on the bottom would make main jet changes easier lol
Sent from my SPH-L720 using proboards
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Post by 190mech on Jun 18, 2014 20:39:28 GMT -5
Maybe an "upside down and backwards engine" will make a good next build??  |
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Post by moofus02 on Jun 18, 2014 20:52:51 GMT -5
John where do you find this stuff lol
Sent from my SPH-L720 using proboards
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Post by 2strokd on Jun 19, 2014 10:32:08 GMT -5
"so you do the hoky poky and ya turn it all around"  High end 2T tuner forums have a bunch of good stuff! |
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Post by 2strokd on Jul 18, 2014 15:40:36 GMT -5
Snoopy is coming out of storage for some fist ever 1/4 mile passes soon.. How fast do you think a 8s in the 1/8th @ 80MPH scoot will go in the 1/4?
I need to get some final drive gears back in it and a battery, maybe a better rear pulley? and it should be good to go? Cant wait to run this badboy again! Been too long!
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Post by 2TDave on Jul 18, 2014 16:21:45 GMT -5
What ratio gears? I'm ready to see some videos of that!
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Post by 90GTVert on Jul 18, 2014 20:31:06 GMT -5
Very much looking forward to hearing (maybe seeing?) how this goes and how Skeedr does! I'm not sure what to think it can do in the quarter. If it has the power and gearing to keep pulling then it could be even very low 13s and 90-95MPH. I'd suspect it will not pull so hard the last 1/8 and those numbers are optimistic though. Only one way to know for sure.  |
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Post by dude on Jul 18, 2014 22:24:20 GMT -5
Where are you going to run a 1/4 at? I gained 6 mph but I am a fat man on a under power scoot lol. Have you road tested it at higher speeds?
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Post by 2strokd on Jul 19, 2014 10:43:23 GMT -5
I am going to try to run them both at a track up north of here. I ran my car there back in the late 90,s and had a blast! With the way the build feels in testing etc i think its pretty much good to go for the 1/4 with a 10ish final drive gear. It pulls right on past the 1/8th mile a pretty good ways before it "gears out" and runs the engine to redline. Something i should mention is i have never geared it out.. Ive run it right on past the 1/8th up to a guestimated 90MPH or so and it didnt flatten out. Niether one of my bigger wheeled drag scooters will run out of gear in the 1/8th. I think the optimum final drive gear for both my scoots would be in the 11 range. 10,s are just too tall for the 1/8th but provide a much more steady and predictable launch. Some of my passes back in the "13:55" days were downright violent for a scooter. Most all my vids are shot from the side but if you could see a rear angle of some of those launches you would see the scooter get squirrely. Some i even had to lift all the way off and get back into the throttle. I fallow some 1/4 mile scooters that run at Santa Pod and do it well. Some are in the "100MPH club" with scooters that run well into the 12,s at over 100MPH. Those are the numbers and the club i am shooting for this season  |
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Post by 90GTVert on Jul 19, 2014 10:50:52 GMT -5
If they had full slips you could get some idea by seeing their ET and MPH over distances vs yours. I just figured you launched so hard that you really shine off the line. Regardless, can't wait to see what it really does with no need for speculation!
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Post by 190mech on Jul 19, 2014 16:32:27 GMT -5
Hey Robert,Dont forget to change that cheap 35mph front tire I installed if Snoopy is gonna get the green light for a WFO pass!  |
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