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Join Date: Dec 2005
Location: Mount Airy, MD
Posts: 2,838
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Bearing crush sleeve crush
Might anyone have a 'spent' 930 bearing crush sleeve they could measure? The new on in my hand is 37.25 mm. The back sides of the inner and outer race measure equal heights (bearing down, race backside up).
I'm trying to get a feel for the distance between the back sides of the two races. I've machined two 'bearing holders' out of 1018 to accept the larger inner 930 bearing. I will then weld these to an early SWB steel banana after trimming material so I get the correct spacing. It's all madness to put 934 center locks on my 67 ![]() I took a stab at measuring inside an aluminum turbo banana, but is not an easy measure. I got close to 36 mm. A 1.25 mm length change in 37.25 mm doesn't seem too bad at 3.3%. Thanks in advance... t
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1967 912 with centerlocks… 10 years and still in pieces! |
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If you can wait until tomorrow night, I have a couple used ones that I can measure for you, I think your not far off on the crush, But Id go by the spacers. They are a ***** to get set right, You need to use a dial indicator, along with a very accurate click 3/4 drive torque wrench. Its easy to overshoot the torque and bearing free play, trust me I ve done it, :-O.. I would almost go with a hard crush sleeve over the Porsche collapsable ones at 100 bucks each. And use an inch pound needle torque wrench like on a pinion gear set up to measure resistance torque, which Porsche gives values for in the 930 manual..
Nice project though your doing using the steel arms, Id be surprised if the 930 sized bearing fit tnat, even machined out, I ll have to look at the sets I have just for curiosity... Good luck, Ben |
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Ben:
That would be awesome. No screaming hurry ![]() So I just need to know how deep to cut... I'll get pics as I go if your interested. I haven't got the iPad picture post thing sorted yet ![]()
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I found these pics a while back, I think on some German site, and they looked well made replica's of original '73 Short arms for RSR. Look well made with a bigger bearing than a normal steel arm, but not the same bearings as a turbo, using the two sided cone bearings and crush sleeve...
![]() ![]() Might give you a few more Ideas... |
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