Aluminium case torque specs. different to mag?

bajachris88 The international telephone dialing code for Antarctica is 6

6,661 posts · joined Apr 2005 · 16 Oct 2013, 9:30 pm

#972907

Hi all,

Craig from crankshaft engineering is assisting me with some bearing clearance issues. He said for blue printing, the aluminium case main studs might have different required torque specs compared to the stock vw magnesium cases.

Its a CBPerformance Aluminium Case. I have sent an email to CBperformance, but they said on the website it could take a week for a reply. Would anyone know if factory torque specs still stand?

Thanks,
Chris.

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69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!

Camo Custom Title Time!

1,936 posts · joined Oct 2007 · 17 Oct 2013, 7:31 am

#972936

PM sent.

Kev

I thought rebuilding a VW would be cheap - Shit I was wrong, just don't let the wife know !!!!

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matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 17 Oct 2013, 8:28 am

#972941

With stock hardware I use stock spec

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
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bajachris88 The international telephone dialing code for Antarctica is 6

6,661 posts · joined Apr 2005 · 17 Oct 2013, 9:17 am

#972952

Thanks guys.

There's little factory hardware on this. Has VW oem main bearings plugged around a forged c/w 74mm stroke chinese crank.

Planned Red line won't be very high, at most 6000rpm allowance when forced induction bolted on (Stage 2). Its certain that SP heads won't be anywhere near that prior to stage 2. If its too bad i'll conclude the SP experiment as a dud as swap the heads out.

Update: CB Performance where quick to reply! wow, they just said factory 25 ft/lbs.

(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 · 23 Oct 2013, 5:31 pm

#973516

just trying to hlp it's not that changing the metal that requires the mild torquen setting it's the whole engine being air cooled it goes from cool to bloody hot when that happens the studs will be holding about 80 foot pounds and by screwing them down you will be asking them to hold much more and thats when head studs pull out
keep the book tensions

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