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Registered
Join Date: Jan 2021
Posts: 9
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2.2 S engine upgrade
Hi,
I have just started rebuilding 2.2 S MFI engine. While pistons and cylinders have to be replaced I started thinking about upgrading the engine. What ways can I go ? I have read somewhere that changing pistons to 2.4 S may give some extra power without need of MFI Pump resetting . Are there any other options ? Thank you Martin |
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Registered
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
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Hi Martin,
In order to get to 2.4S from a 2.2S would require a change to pistons, rods and crankshaft. That said, the fuel maps between both of them are pretty close. I have never tried it so I can't provide feedback for actual performance. Alternatively, you can Bore out the cylinders to 85mm for new pistons or buy Nickies with a larger Bore than 85mm
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Aaron. ![]() Burnham Performance https://www.instagram.com/burnhamperformance/ |
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,467
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You have a great base to work from.
Suggest 10/1 pistons on bored cylinders. If your P&C s were good, going to a 2.4/2.7 crank and rods gives 10.3 cr Going to 2.4 S pistons only gives you less than 8.5 cr because they are 8.5 on the long 2.4 crank. Bruce |
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Registered
Join Date: Aug 2006
Location: So cal
Posts: 151
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2.2 Sengine
It is hard to beat the 2.2S engine as it is the last of the high compression engines. The 2.4 S engine was 8.5 CR to satisfy the federal laws on fuel usage. You power band will stop around 6300 rpm where as the 2.2S will pull strong up to redline.
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Registered
Join Date: Jan 2021
Posts: 9
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Thank you for your advice. I think I will stay with OEM spec.
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Try not, Do or Do not
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Quote:
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Over the years we've discovered that the 2.2 "S" (9.8:1) static compression is actually closer to 9.4:1. By changing the stroke the resulting static compression is closer to 9.9:1.
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Registered
Join Date: Dec 2014
Location: Orange Park, FL
Posts: 343
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There's not really much you can do to get more power out of that engine. Perhaps as other have mentioned, MOD-S cams (Dema Elgin or DRC). If you really wanted a project, you could put the MFI on the shelf and go with an EFI setup that will net you a few extra hp.
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1971 911T Irish Green Coupe |
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Administrator
Join Date: Sep 2000
Posts: 337
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Quote:
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Try not, Do or Do not
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Rich mixture, retarded timing and easy throttle trough maximum torque can mitigate the issue. Edit: sometimes you can mitigate detonation by simply changing to a cooler spark plug.
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net Last edited by Henry Schmidt; 01-10-2021 at 08:39 AM.. |
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Administrator
Join Date: Sep 2000
Posts: 337
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Thanks...sounds like it'd be better to just shim the cyls and knock the compression down to 9.6 or .7? Any sense of what kind of power such an engine would make with mod-s cams?
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Try not, Do or Do not
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Quote:
Our twin plug, 9.5:1, Mod "S", 2450 (70.4 x 86) with 40mm Webers have been dynoed at 180 RWHP. Chassis dynos are dubious at best but the drivability and seat of the pants acceleration seem to quantify the numbers.
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Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Tags |
2.2 911 engine , 911 s , tuning , upgrade |