I have a need for a driveshaft that's going to operate at a fairly steep, but static, angle of ~17 degrees. It's also going to see up to 5000rpm. I've pretty well decided that a 930 series \series 15 Porsche style CV joints make the most sense. I've already got adapters handled, but now I need to buy joints and a shaft. I don't think I'll need plunging joints, the 1/4" or so of play in the splines should be plenty I think. Who does this kind of thing? It would be nice for it to get balanced too.
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930 CV driveshaft suppliers?
- Thread starter larboc
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930 Components
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McKenzie's stocks ProAm Raining axles for 930,934 33 Spline, 934 35 Spline, and Series 30. Axles are special order only, as we assure customers receive proper axle length. Please contact to order - McKenzie's Performance
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arse_sidewards
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I'm in the same boat. I've just assumed I'll use a GMT800 CV and just keep warrantying it out at Autozone. 
Appx. 22"
arse_sidewards
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Duuuuuuude.
That's right in the middle of the range for off the shelf automotive stuff.
You should be building adapters to use an off the shelf CV and warrantying that bitch out when it goes pop.
You probably already know this but critical speed is over 10k for a 1.25 shaft of that length so you don't even have to worry about that either.
That's right in the middle of the range for off the shelf automotive stuff.
You should be building adapters to use an off the shelf CV and warrantying that bitch out when it goes pop.
You probably already know this but critical speed is over 10k for a 1.25 shaft of that length so you don't even have to worry about that either.
arse_sidewards
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Here's a random Subaru shaft.
TrailTamer
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How long it need to run and what torque? Will there be a joint at both ends?
CVs burn up quickly when used as a driveshaft at steep angles. Jeep JK make for a good example. Their driveshaft have a CV at axle is guaranteed to fail when lifted, even with a small lift and stay in 2wd 100% of time.
CVs burn up quickly when used as a driveshaft at steep angles. Jeep JK make for a good example. Their driveshaft have a CV at axle is guaranteed to fail when lifted, even with a small lift and stay in 2wd 100% of time.
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arse_sidewards
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Jeeps fail because the boot tears and the grease gets flung out.
If he can keep it greased it will probably be fine.
It looks like EMPI has shafts of the correct length as well.
FWIW a "930 CV" is an off the shelf half shaft joint for a Porsche 930. And while I initially thought I'd be outside the speed range, it actually isn't. Stock application at top speed the halfshafts/tires are seeing 7000rpm so 5k shouldn't be an issue but I'd like someone in the know to confirm.
~600ft lbs peak. Needs to last 2000 miles. Yes, same joint at both ends. Independent suspension application so no travel.
did you check toyota joints? all the aussies use them as driveshafts
Would spin the wrong way! jk.
Some quick googling isn't showing what you're talking about?
TrailTamer
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your rpm #s doesn't compute for me.
may want to check your calcuations.
my math tells me at porsche 930's top speed (157 mph?), half shafts/tires turn at roughly 2,000 rpm....
birfield based driveshaft
:D :D ok let the flaming commense. i recently finished my d44 sas on my 86 runner (its is sweet). however i ran into a bit of a problem when it came to the front driveshaft. i was going to go to the square idea when i discovered that my stock cv for my old front did not have enough angle to...
The Driveshaft Shop - Home Page - Driveshaft Shop
If you don't want to be cheap, I've had shafts built from here to use for testing in my driveline cells.
If you don't want to be cheap, I've had shafts built from here to use for testing in my driveline cells.
You're definitely right. I forgot pi. Hmmmm
Just buy an off the shelf swayaway axle.
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Drive shaft or axle? If I remember correctly, 930's can spin 6K reliably. We ran them on the short course trucks in the Mickey Thompson series. That didn't have that high of speed, but with 6.50 gearing the DS's were singing right along. On the outdoor events it was pretty common to redline in top gear which would have the DS spinning over 7K when you figure in convertor slip.
TrailTamer
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I think they topped out at 30 at full droop. Those things were short WB. like 95".
Good info all, thanks. One other question, it looks like these CV's are just using the bolts to hold them concentric? Seems odd, the grand Cherokee GKN joint appears to have a counterbore in the yoke to make sure they are centered, but it looks like the Porsche stuff just uses the bolts, I can't see any evidence of a counterbore?
Money I have, time I don't. Right now it looks like the 930CV stuff, and shafts, are all COTS ready to ship and I am not seeing a reason it won't work.
arse_sidewards
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If you were already prepared to make flange adapters it should be cake to make something to center it with.