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Registered
Join Date: May 2021
Posts: 11
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3.2 (Motronic) Twin Plug- Stock Pistons?
Hi All,
Long time reader, new to posting. Bought my beloved 1980 911SC row Petrol Blue from a fellow Pelican junkie back in 2019. Along with the car, I purchased a 3.2 Twin Plug setup that Bob ( Previous Owner) had sourced to eventually go with the car, along with many, many other goodies. Well some years later, I have decided to finish the car. The motor was described to only have ran 5k miles since it was built, and swapped out for a Turbo motor circa 2006. Sitting since, I subsequently had the valve covers, fan, fan housing, timing covers etc etc. We never stripped it down and pulled heads as the valve seats looked incredibly clean, leaked down 0% etc Well , motor is all pretty, in the car, and ready to have SW burn a chip. Turns out it is a stock 3.2 pistons ! Why someone would go through all the trouble of porting, polishing heads, inatake mani, throttle body, twin plug modification etc to have stock CR is beyond me. I cannot emotionally handle a full rebuild at this time. My question is.. Do you guys see any point / benefit in utuilzing the twin plug heads given the stock pistons. If not any benefit, any risk? When I can figure out how to add photos , I will do just that! TIA Brian |
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04-11-2023, 06:40 AM
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PCA Member since 1988
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Twin plug heads won't work with stock 3.2 pistons. The stock pistons have a lump on one side of the piston to push the combustion chamber towards the single plug. The twin plug pistons have a different shape.
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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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04-11-2023, 11:11 PM
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Registered
Join Date: Dec 1999
Location: tacoma wash
Posts: 399
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07-04-2023, 04:28 PM
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PCA Member since 1988
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Maybe so, but there's been no response from the OP in a couple months. Let sleeping dogs lie.
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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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07-04-2023, 11:15 PM
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Racer
Join Date: Oct 2010
Location: Franklin, TN
Posts: 5,885
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Scott Winders PCA GT3 #3 2021 & 2022 PCA GT3 National Champion 2021 & 2022 PCA West Coast Series GT3 Champion |
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07-05-2023, 12:37 AM
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Registered
Join Date: Dec 1999
Location: tacoma wash
Posts: 399
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I have the twin plug as well But I also have the after market piston |
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07-05-2023, 07:22 AM
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