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Join Date: Sep 2002
Location: Port Angeles, WA
Posts: 77
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pistons-which side up???
Which side faces up?
The only clues are the letters STD stamped in the center and the relieved area for the valves (?). Help- please, Neal |
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08-26-2003, 09:46 PM
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Location: Port Angeles, WA
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sure would help if I attach the picture....
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08-26-2003, 09:48 PM
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Location: Crestline, CA
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All valves are angled into the combustion chamber area. If I had a head in my hand, I could tell immediately. Look at the combustion chamber on your head and see which way the valves are angled, either / or \ (face of valve). The flycut would be placed on the side of the valve that sticks out the most so that when it is open (ing) it does not stricke the piston. Remembering the valve train layout on the VW, the depression would be at the top of the engine.
these appear to be high compression pistons. Watch your CR when installing.
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"Inventor - Blue Flame 914 Seat Heater" "Yellow Rusty Cars Are Faster" _____________________________ '70 2.5 (I'll never finish it - Somewhere over the rainbow.....,) '73 2.0 (Just Not The Same) '74 2.0 (Heartless & Lungless) |
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08-27-2003, 06:22 AM
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Location: Aircooled Heaven
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The valve reliefs go down, which would actually invert the STD stamp when correctly installed......
Watch those pistons!
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Jake Raby Owner, Raby's Aircooled Technology www.aircooledtechnology.com www.massivetype4.com |
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08-27-2003, 06:59 AM
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Damnit - there goes my memory of the layout - price of being old - thanks for answering Jake.
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"Inventor - Blue Flame 914 Seat Heater" "Yellow Rusty Cars Are Faster" _____________________________ '70 2.5 (I'll never finish it - Somewhere over the rainbow.....,) '73 2.0 (Just Not The Same) '74 2.0 (Heartless & Lungless) |
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08-27-2003, 09:06 AM
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Location: Savannah, Ga.
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Wouldn't it be a real hoot to find out that Jake had been building engines upsidedown?
=o M
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I wish I had a dime for every penny I ever had. http://www.914club.com/bbs2/uploads/blog-1136350347.jpg |
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08-27-2003, 10:24 AM
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Ok, which side facing the flywheel for the wrist pin offset?no markings?
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Scott 1982 911 SC 1962 sunroof bug 1991 WE Vanagon CARAT WRX conversion |
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08-27-2003, 10:26 AM
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Location: Port Angeles, WA
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Quote:
The supplier suggested installing with the STD stamp right side up which did not make sense to me. Neal |
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08-27-2003, 04:23 PM
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Hmmn, that clown probably never built an engine.....I hate people that sell things that know little about them...
Look at the cylinder heads and you will see an 11 degree valve angle that compliments those pistons being installed the way I suggested.. BTW, the piston are probably originally made for a 2.3L Ford engine.. If the rings say Grant on the box, well.............................
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Jake Raby Owner, Raby's Aircooled Technology www.aircooledtechnology.com www.massivetype4.com |
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08-27-2003, 05:47 PM
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1982 Porsche 911SC
