1970 2.2 T HP vs. 2.2 T pistons and 2.4L Crankshaft

[27Carrera]

I have been extensively reading through all available written works regarding the rebuilding of my engine and the two different inputs that I see are, keep it stock or add a 2.4/2.7 crankshaft. Does anyone have an engine dyno graph showing the difference between a healthy 2.2t and a 10.1:1 long stroke 2.4?

If there is quantifiable evidence regarding difference in power and drivability it would be worth the undertaking.

The cost of going to a longer crank, weber 44s and solex cams is rather expensive vs. a really good quality oem rebuild + some other oiling and reliability modification to the existing 2.2.

Any assistance would be appreciated!

Thanks,

[Flat6pac]

The T pistons are only castings, not forged.
I dont know where you got the info on compression figure because .2.2 S pistons on a 2.4 crank produces 10.3 CR from 20+ years ago calculations.
Bruce

[TVRLOTUSTR3]

Years ago I put together a 2.2 case using a 2.7 crank, 2.2T pistons and E cams (2.4) Zenith carbs with 32mm aux venturis (weber chokes with spacers).
I do not have any hp figures, but compared to the 2.2T it was a lot stronger definately worth doing!

[tharbert]

I'm no guru but I, like you, have been reading a lot of books and threads here while I'm going through my rebuild. I think the 2.2 E pistons and the 70.4mm crank will put you roughly 9.5:1 c/r. Not sure you wanna go much past 9.8:1 unless you plan on twin plugging. If you have an E cam core, you can have it reground to a Mod Solex profile, apparently an improvement over the original Solex grind and its much less than buying new. So, the trick is to find an inexpensive good core E or S cam. A lot of folks think they're old cores are worth almost as much as you can get one new. Happy hunting!

I think you will find either path you go, straight OEM refresh or component changes for increased performance will cost about the same: more expensive than you imagine.

[27Carrera]

thank you all for the insight. I am going to likely stick with oem stock components along with some good oiling updates. The engine is to go into my 914 and w/o replacing nearly every component in the car I feel that it will be good to stay torquey and reliable.