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turboed64
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« on: May 22, 2006, 01:08:13 am » |
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I have a Porsche Journal 86x96.7, 910 Heads, Flanged crank,ARPM case (4 studded) motor. Is it strong enough to run in a Drag Car? I heard that Porsche Journal Bearings don't hold up to drag racing abuse. Any input?
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A BADA$$ Bug is the ultimate!!!!
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DEVILSHOTROD
Newbie
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Posts: 93
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« Reply #1 on: May 22, 2006, 02:11:50 am » |
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Every bearing holds fine its the maintenance program that keeps a motor alive.  So yes i ran a porsche Journal crank with big power for years |
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Home of the Clydesdale's
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Jason Young
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« Reply #2 on: May 22, 2006, 03:21:58 am » |
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isnt berg cranks porsche journal, or atleast i think they used to be
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raceyoung.com
welding-works.com
geneberg.com
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jimr
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« Reply #3 on: May 22, 2006, 10:39:47 am » |
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I know of a guy that has an original Okrasa 84mm 912-journal crank that was in a midget, then a 356-replica, then a 12-sec street Ghia, then a low 11-second Bug, and I only know of this crank's activity since 1990. Crank is still straight, standard, and crack free.
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Der Kleiner Panzers VW Club
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Isaac Potter
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« Reply #4 on: May 22, 2006, 12:06:16 pm » |
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why not just send it to DPR. i thought you can convert a porsche journall to chevy journal. plus widen the journal width to chevy specs. and if you dont like that i'm sure DPR could fix what ever problem you have with the crank
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2stroke
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« Reply #5 on: May 22, 2006, 12:20:05 pm » |
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here is my porsche rod bearing after about 15-20 high boost passes on the street
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ugly as sin, fast as hell!
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dangerous
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« Reply #6 on: May 22, 2006, 03:42:00 pm » |
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That's not a porsche journal/bearing design problem.
If oil is at the bearing ALL the time and you stay away from detonation they will be fine.
My 2965 with 42psi and 10:1 broke conrods, but the bearings were always sweet.
Plus, thinner journals and larger diameter journals make for a stronger crankshaft..
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N/A 10.93@122.31@1785lbs
Blower Mtr 147mph@1870lb
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Marty
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« Reply #7 on: May 22, 2006, 03:48:14 pm » |
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Detonation starts to flatten the bearing making it get wider until it starts to "climb" the journal radius.
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Marty
staggsracing.com
m-specmotorsports.com
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2stroke
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« Reply #8 on: May 22, 2006, 05:00:14 pm » |
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bingo.
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ugly as sin, fast as hell!
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Tom Simon
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« Reply #9 on: May 22, 2006, 05:28:38 pm » |
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I'd run it. The 53mm Porsche rod journal VW race cranks used to be real common, like someone said the journals are narrower making the crank cheeks wider and the crank stronger overall. 2" chevy got real popular a few years ago because the Porsche rod bearings were getting tough to get for a while, especially in the undersizes if the crank needs to be ground. I had a Berg 86 that was ground to 2" Chevy but narrow Porsche width. Strong AND you could get a good bearing. The down side was I had to custom narrow 8 bearing halves one at a time at freshen up time, which was a biotch. When compared to 2" Chevy, you can't get Porsche journal rods very easily either. The super-duper tri-metal coated clevite and other bearings are better, but the old lead-tin or lead-tin-indium bearings are fine so long as you keep oil at the journal.
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jimr
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« Reply #10 on: May 22, 2006, 07:10:02 pm » |
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I'd run it. The 53mm Porsche rod journal VW race cranks used to be real common, like someone said the journals are narrower making the crank cheeks wider and the crank stronger overall. 2" chevy got real popular a few years ago because the Porsche rod bearings were getting tough to get for a while, especially in the undersizes if the crank needs to be ground. I had a Berg 86 that was ground to 2" Chevy but narrow Porsche width. Strong AND you could get a good bearing. The down side was I had to custom narrow 8 bearing halves one at a time at freshen up time, which was a biotch. When compared to 2" Chevy, you can't get Porsche journal rods very easily either. The super-duper tri-metal coated clevite and other bearings are better, but the old lead-tin or lead-tin-indium bearings are fine so long as you keep oil at the journal.
yeah, funny how nobody mentioned setting up rod bearing radial clearances and side (axial) clearances so the bearing will have oil flow over it. |
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Der Kleiner Panzers VW Club
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Marty
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« Reply #11 on: May 22, 2006, 07:45:19 pm » |
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yeah, funny how nobody mentioned setting up rod bearing radial clearances and side (axial) clearances so the bearing will have oil flow over it.
Isnt that a given? |
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Marty
staggsracing.com
m-specmotorsports.com
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jimr
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« Reply #12 on: May 22, 2006, 07:56:32 pm » |
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Isnt that a given?
I would hope so. |
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Der Kleiner Panzers VW Club
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matchap
Junior
Offline
Posts: 205
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« Reply #13 on: May 22, 2006, 08:09:15 pm » |
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Just a hint. The rod bearings are much cheaper if you order them from a Porsche Supplier and not a VW parts source. Glyco seems to be the norm right now for standard bearings and Kolbenschidt for undercuts.
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toysandprojects
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« Reply #14 on: May 22, 2006, 11:11:17 pm » |
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10 years street and strip 86/94 hi compression no problems! after the first10 i looked at them because they were old they looked great. replaced them anyways!
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vwparts.net
rimco
Bugpack
jamar
AJ Sims heads
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turbo_bob
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« Reply #15 on: May 23, 2006, 12:44:45 am » |
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I have a Berg, Porsche rod journal, 411 C/M crank in my engine all these years, holding up great.
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All the Quick & Fast VW Street Cars are TURBOED!!!
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turboed64
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« Reply #16 on: May 23, 2006, 02:23:18 am » |
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thanks guys... I am putting that motor in tomorrow.. the exhaust from my wife's motor fit it perfectly. what luck. I should be at Irwindale to make a few runs and then hopefully off to SAC.... |
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A BADA$$ Bug is the ultimate!!!!
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