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Registered
Join Date: Nov 2004
Location: ronkonkoma ny 11779
Posts: 2,024
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912 engine help needed
well my little 68 912 project needs some help. Im getting blowby and loss of power from the motor. I did a compression check and get @ 90lbs on 3 and 4 and 120lbs on 1 and 2.
Is it possible to drop the heads with the motor in the car? It looks like I have room. Any comments are appreciated. Also: if I do drop the motor should I replace the jugs and pistons with the 86mm "big bore" kit? Its @ $400 for the set with rings and they are cast iron jugs, not looking for a racer just looking to cruise around on the street occasionally. Finally I see the rod bearings are reasonable but the mains seem outrageous are there any vw interchange on the mains?
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83 944....bye bye 85.5 euro spec 944, 5sp (she's gone....  74 914...hasta LA Vista baby 87 924s....don't let the door hit ya 68 912.......see ya! |
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09-18-2006, 08:03 AM
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Join Date: Jun 2006
Location: Virginia Beach
Posts: 556
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Drop the motor, I isn't difficult and you'll do a better job. Take all the tin off around the cylinders. Big bore are okay and you should plan on replacing the rod bearings. also while you have the engine out check the cylinder heads and valves. Rebuild those as well. If the motor has a lot of miles on it or it hasn't been properly serviced, then split the case and go the full route.
You'll be happier with the end product. good luck, rusty virginia beach |
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09-21-2006, 07:40 PM
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Join Date: Nov 2004
Location: ronkonkoma ny 11779
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youre the 3rd person who said exactly the same thing, its coming out! Thanks for the good advice. are the main bearings actually over $300 everywhere?
__________________
83 944....bye bye 85.5 euro spec 944, 5sp (she's gone.... 74 914...hasta LA Vista baby 87 924s....don't let the door hit ya 68 912.......see ya! |
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09-22-2006, 08:58 AM
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Join Date: Jun 2006
Location: Virginia Beach
Posts: 556
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Earl, don't worry too much about the main bearings until you have the crank out and mic'ed. If it needs polishing then you can measure and see what size mains you will need. I may have a set around here somewhere. Once you determine what you need look on ebay, sometimes you'll get lucky.
good luck, rusty virginia beach |
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09-22-2006, 10:02 AM
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Registered
Join Date: Nov 2004
Location: ronkonkoma ny 11779
Posts: 2,024
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ok, I also plan on connecting an oil pressure gauge before removing the motor to see where im at. Thanks again.
__________________
83 944....bye bye 85.5 euro spec 944, 5sp (she's gone.... 74 914...hasta LA Vista baby 87 924s....don't let the door hit ya 68 912.......see ya! |
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09-22-2006, 04:14 PM
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