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Registered
Join Date: May 2009
Location: Durango Co
Posts: 10
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2.0 case /w 2.2 heeads
our project is the 1968 T longhood euro - seems we might have a couple bad heads can we put 2.2 heads on a 2.0 case using the T barrels and pistons, if so what will that do to our compression, and would S cams work as a good combination.
were using webers |
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06-05-2009, 09:14 AM
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At a minimum T pistons and S cams don't work too well. You will need to machine the tops of the pistons to ensure that the S cams to come in contact with them, and the CR is going to be too low for the S cams to work well. The engine will be real week when "off cam".
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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06-05-2009, 02:34 PM
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Max Sluiter
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The 2.0 barrels are too small diameter for the later 2.2, 2.4, 2.7 heads with their flatter, more open combustion chamber. This will cause detonation pockets unless the heads are welded up in their chamber perimeter to meet the cylinder wall smoothly.
And yes, there will be valve/piston interference problems with T pistons and S cams.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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06-05-2009, 03:11 PM
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Max Sluiter
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see this thread: Compatability question: 2.4 heads and 81mm barrels
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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06-05-2009, 03:12 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Here is a picture of some heads we did for a 2.0 race engine using 2.2 heads,.......
  This was done before they were twin-plugged, CNC ported and flowed,...  Its not a small job to do but this 2.0 engine made over 235 HP so it was well worth the effort.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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06-05-2009, 07:43 PM
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Registered
Join Date: May 2009
Location: Durango Co
Posts: 10
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Thanks for the help guys!
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06-05-2009, 08:33 PM
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Registered
Join Date: Jul 2005
Location: southern RI USA
Posts: 1,513
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Wait
My understanding is that stock for stock, the 2.2 has a different cumbustion chamber design that the original 'normal' 2.0. Interesting thought -a punched out 2.0 (to 2.2 or so if that is possible) and good exhaust would be a nice motor since the 67 2.0 already made 140 hp before they added that ring in the exhaust system to reduce output and give the S 160 hp motor more of a separation from the base.
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Sepia brown 1971 911T. |
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06-06-2009, 06:41 PM
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Posts: 281
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Quote:
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06-13-2009, 06:38 AM
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1969 Porsche 911E 2.0 E
1971 Porsche 911S
