Subject: Aluminium case torque specs. different to mag?
bajachris88
A.k.a.: Chris Leete
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posted on October 16th, 2013 at 09:30 PM
Aluminium case torque specs. different to mag?
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
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posted on October 17th, 2013 at 07:31 AM
PM sent.
Kev
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posted on October 17th, 2013 at 08:28 AM
With stock hardware I use stock spec
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bajachris88
A.k.a.: Chris Leete
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posted on October 17th, 2013 at 09:17 AM
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
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posted on October 23rd, 2013 at 05:31 PM
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
posted on October 16th, 2013 at 09:30 PM
