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Join Date: Dec 2005
Location: Mount Airy, MD
Posts: 4,299
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Help! Piston Markings...
Howdy all:
Can anyone enlighten me as to the numbers that are on the piston crown? 200 | | | 0899 1 24/6 91.89 and cast into the inside skirt is 195 (on the intake side). The 91.89 is the piston diameter as that is exactly what it measures in mm. Any guesses on the others? Thanks in advance, tadd
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1967 912 with centerlocks… 10 years and still in pieces! |
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11-13-2006, 06:19 PM
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Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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Tadd,
According to Bruce Anderson, a 92mm bore matches a '72, 911 RSR, 2.8L MFI, with 10.3:1 comp. One bad motor, 308 HP @ 8000, 217 Ft/Lbs @ 6200. The cams, 388 degrees intake duration. I would guess if it were these pistons, they would be very light with a nice smooth dome with small cut-outs for valves. Now of course these could also be some 92mm Mahles with a little dome offset to one side for boosting some limp 2.7. Got a picture?
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
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11-13-2006, 07:08 PM
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Location: Mount Airy, MD
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Thanks for the reply... I guess I should have spelled out my question better.
They are 92 mm Mahles spec'ed for the 2.8RSR - large chamber. I was wondering what all the other information printed on the dome specified. It must mean something or they wouldn't have put it there. tadd
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1967 912 with centerlocks… 10 years and still in pieces! |
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11-14-2006, 04:43 AM
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