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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
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Chain housing alignment to cam center
As you guys may have read about my worries over the chain housing alignment to cam center in another thread (Camshaft end-plate alignment question), I have some info that may help others.
I spoke to the only Porsche shop here in SA and talked with the owner last night (he is factory trained from many years ago and his father was a Porsche tech too from the early days). He stated that the misalignment of the chain housing to the cam centers is very common and not a big deal. He has several different chain housing gaskets in stock to adjust for this and also uses a belt sander if need be. As Wayne states, he has also ran engines without the gaskets at all but recommends using them and machining/sanding the housings thinner to accomodate the gasket. Only his race engines does he use a jig that centers the housing on the cam and then figures how much to machine away for a perfect, concentric fit. He went on to say that he has seen misalignments in not only the concentricity of the housings to the cams but even forward and aft due to others sanding by hand obviously not holding it square. This misalignment makes the end plate either pull the housing towards the engine in a forward direction or sometimes he has seen the housings actually resting on the air guides of the cylinders they were so far off! Even his worst case where he received an engine that had the thrust washer rubbing against the camshaft end-plate on one engine didn't even create any ill effects when he tore it down from what he had seen. He wasn't advocating ignoring the misalignment (do what you can), but that it wasn't a huge problem either from his experience. Hope this may help someone in the future.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel Last edited by Tippy; 05-10-2011 at 07:22 AM.. |
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05-10-2011, 05:44 AM
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Registered
Join Date: Jul 2010
Location: Lithia, FL
Posts: 1,265
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Tippy, thanks for the info! Can you pls post the link to your other thread too?
Thanks, RC
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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo...SOLD 1999 Harley Davidson Custom 1250 Hardtail Bobber..SOLD 2014 BMW X6M, 2012 BMW 128i, 2014 GMC Sierra, 2015 Cobia 237 Center Console 300hp Yamaha |
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05-10-2011, 06:36 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
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Quote:
Added to OP.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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05-10-2011, 07:22 AM
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Registered
Join Date: Jul 2010
Location: Lithia, FL
Posts: 1,265
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Quote:
__________________
FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo...SOLD 1999 Harley Davidson Custom 1250 Hardtail Bobber..SOLD 2014 BMW X6M, 2012 BMW 128i, 2014 GMC Sierra, 2015 Cobia 237 Center Console 300hp Yamaha |
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05-10-2011, 07:55 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
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No problem
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05-10-2011, 03:14 PM
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