Lightening components
Does anyone have experience with lightened running gear? Things like gun drilled axles, pinion shafts, transmission shafts. Lightened ring gears and axle flanges etc.
Source for lightweight driveshafts? I know someone used to make an aluminum shaft for the 1st gens, just don't know who. Cost, Advice, Durability? |
i have heard <--- key words! that the spec miata people do this kind of thing. on something like a 12A with a Nikki, that isn't going to make much power, i'd think doing all the gun drilling would be fine reliability wise, provided you started with the bigger 84-85 axles.
benefits are probably pretty small? |
i build a little test rig in solidworks, and its interesting, you loose strength as you start drilling the axle, but not that much, until you get stupid with it.
for instance going from a 6mm hole to a 15mm hole has a small impact, but a 25mm hole actually starts tearing. the other important thing is the way the axle is machined does matter, big fillets help a bunch |
Originally Posted by Rx7carl
(Post 11430586)
Does anyone have experience with lightened running gear? Things like gun drilled axles, pinion shafts, transmission shafts. Lightened ring gears and axle flanges etc.
Source for lightweight driveshafts? I know someone used to make an aluminum shaft for the 1st gens, just don't know who. Cost, Advice, Durability? i know someone that has a drag car, he owns a shop, ****** shack ... his drag car has lightened spool, gun drilled axles, scalloped hubs, ultra lightweight brakes, aluminum driveshaft lots of ti. hardware all over the car.. he gets all his customers aluminum driveshafts from inland empire driveline in upland ca. |
Originally Posted by j9fd3s
(Post 11430886)
i build a little test rig in solidworks, and its interesting, you loose strength as you start drilling the axle, but not that much, until you get stupid with it.
for instance going from a 6mm hole to a 15mm hole has a small impact, but a 25mm hole actually starts tearing. the other important thing is the way the axle is machined does matter, big fillets help a bunch Did you apply a bending force to your FEA, in addition to the torsional? Full floaters: Gun drilling works fine for either drag or road race, since this design removes the bending force from the axle shaft. |
Originally Posted by j9fd3s
(Post 11430843)
. . .
benefits are probably pretty small? That said, I do have an aluminum driveshaft. I got one because I had a hell of a time getting an aftermarket steel one that was properly balanced, and I had been told that the lighter weight of the aluminum shaft made it easier to get right. The shaft was made by Quarter Master. They only use 1310 style u-joints, so you would need to supply the transmission yoke, pinion yoke, and adapter style u-joints. I wrote this up in my Toyot 8 build thread (post #50) --> https://www.rx7club.com/build-thread...a-8-fb-992844/ |
Originally Posted by elwood
(Post 11431170)
Did you apply a bending force to your FEA, in addition to the torsional?.
15mm gets you 1.23... so its a similar curve, small hole and you loose almost no strength, but after a fashion strength drops way off. and B it HEAVILY depends on the ACTUAL construction of the axle, fillets and radii matter, so i think the trend works, but i wouldn't go and drill a 15mm hole in my axle based on this! so i have an axle sized iron thin, and its 7.95lbs, with a 2mm hole, and with a 10mm hole its 7.53lbs, that's more than i'd expect |
Originally Posted by Rx7carl
(Post 11430586)
. . . Lightened ring gears . . .
I'd say to call and talk to an engineer at some of the better shops like Mark Williams and Strange. I talked to a few guys at these places in the past, and they seemed to know their stuff and not offer up any BS. |
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