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Registered
Join Date: May 2004
Location: Tallmadge, Ohio
Posts: 217
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All 2.7 Cranks Counterbalanced?
Are all 2.7 cranks counterbalanced? Seems I read somewhere about some motors having non-suitable non-counterbalanced cranks. The motor I am looking at is maybe a '77 with 3R cases.
Any way to tell from the outside what ports it might have etc? And which crank? There is still some FI stuff on the motor but the model it came from is unknown. From prior communications I think it is a base motor but don't know. Owner is deceased. Been sitting many years in dry storage. I believe it still turns by hand. TIA!
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Triplesn8s '72 911T Coupe - Resto Proceeding at a Snails Pace ‘80 TR8 Convert - SOLD '78 TR8 Coupe - Autocross Project '06 Ducati 1000SS/DS - ‘11 H-D XR1200x |
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04-02-2024, 09:28 AM
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Join Date: Feb 2009
Posts: 1,005
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All 2.4-2.7 cranks are counterbalanced. You need to post serial # to identify. 77 would have 7R-7R case, 3R would be like 72-73 2.4. Again serial # and type # would help.
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04-02-2024, 11:06 AM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,703
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Some 2.0L engines had non-counterweighted cranks. Perhaps that's what you read.
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04-02-2024, 01:05 PM
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Join Date: May 2004
Location: Tallmadge, Ohio
Posts: 217
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Got a photo. It is a CIS motor. Shroud is green. Dats all I got.
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Triplesn8s '72 911T Coupe - Resto Proceeding at a Snails Pace ‘80 TR8 Convert - SOLD '78 TR8 Coupe - Autocross Project '06 Ducati 1000SS/DS - ‘11 H-D XR1200x |
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04-02-2024, 01:46 PM
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PCA Member since 1988
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Engine serial number will tell you what year and what it was installed into.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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04-02-2024, 02:14 PM
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Join Date: May 2004
Location: Tallmadge, Ohio
Posts: 217
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Is there a decipherable code for the serial numbers so I can make a judgment call on the spot regarding this motor? I was told it is a 77. That’s all I know. And that it’s been sitting a long time.
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Triplesn8s '72 911T Coupe - Resto Proceeding at a Snails Pace ‘80 TR8 Convert - SOLD '78 TR8 Coupe - Autocross Project '06 Ducati 1000SS/DS - ‘11 H-D XR1200x |
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04-02-2024, 03:04 PM
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PCA Member since 1988
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There are threads here with series of engine numbers, but the easiest thing to do is type "Porsche 911 engine (number)" into your browser and see what it brings back.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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04-02-2024, 03:16 PM
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Registered
Join Date: May 2004
Location: Tallmadge, Ohio
Posts: 217
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Great idea. Going to try that.
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Triplesn8s '72 911T Coupe - Resto Proceeding at a Snails Pace ‘80 TR8 Convert - SOLD '78 TR8 Coupe - Autocross Project '06 Ducati 1000SS/DS - ‘11 H-D XR1200x |
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04-02-2024, 03:36 PM
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