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Location: Boca Raton, FL
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1973 T Rebuild Results

Hey guys-
Wanted to get some experts in on this to see if these are the results I should be expecting for a 1973 T rebuild. Stock hp should be 140 hp. This was pretty much a stock rebuild except for the following:
1. Fly cutting of heads with race valve job.
2. Upgraded to 911 E cams

Let me know what you guys think.

Attached are the dyno results.


Old 04-25-2010, 08:31 AM
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So the conditions in the engine room were 88 F and 19% humidity? Is the above data SAE (or other standard) corrected for those conditions? What oil did they run in the engine? What gear was used to record the data?
Old 04-25-2010, 09:52 AM
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Looks like it's getting fairly lean after 4500 rpm. What is your induction system? MFI or Carbs?
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Old 04-25-2010, 03:52 PM
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The car is early, MFI.
Old 04-25-2010, 04:29 PM
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Interesting engine. it seems like flycutting the heads approximates the gains typically seen by running 2.2 pistons?

Was the mfi setup reconfigured to suit cams and compression?
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Sepia brown 1971 911T.
Old 04-27-2010, 05:02 AM
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dan-
not sure i understood your comment with respect "gains typically seen by running 2.2 pistons". It's a 2.4 engine with 2.4 pistons, are you saying I should have had higher gains? The MFI was supposidley recalibrated to support the new config...

I am a bit worried now about running too lean, the mechanic told me it shouldn't be a problem unless I am running the car in 5th at over 5K rpms for a long period of time which I can't imagine I would ever do. - Do I need to have him adjust it accordingly??

Thanks all for the inputs.
Old 04-27-2010, 05:18 AM
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Not sure if gains would have been even higher, but 2.2 pistons are sometimes used in 2.4 builds to raise compression/performance.

I bet you'd see even more power if the fuel:air ratios can be smoothed out. At the very least, prolong the life of this engine.

Regardless, I bet your car is quick!

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