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2.2T upgrade

Hello all

I have tried to find some answers on upgrading a 2.2T engine in other posts, but didn't succed.
I have a 2.2T for 1970 with Zenith carbs and a 901 gearbox.
I would like to have som more power form the engine, but don't have the budget to do a extrem engine overhaul, and would like to use the zenith an gearbox due to budget restrictions, and make it more fast on the street.

hope to make around 160 hp.
I have the posibility to buy some 2.4E P/C and 2.4E Cams.

My questtions are:

are the 2.2E and 2.4E cam the same? I think they are - so I can use the 2.4E cam together with my 2.2T heads?

The 2.4E P/C will combined with a 70 non counterweight crank mean less compression, than the 2.2E P/C? is that correct? so I would not benefit form installing a set of 2.4E P/C together with the E cam vs. a set of 2.2E P/C together with the E cam?

Can I use the E cam, (I think all E cam are the same) together with som 2.2 S pistons and my 2.2T heads and cylinders? and still use the zenith and 901 gearbox? if yes, hvow many HP will I have?

As for now, I don't want to rebuilt the entire engine, so stroking it with a 2.4/2.7 crank and rods, is not the option.

Thanks Rasmuis
Old 02-09-2018, 01:49 AM
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That is a straight forward upgrade.

Not a problem swapping in E P&Cs with the E cams. Stick with the 2,2 pistons, yes the 2,4s will be lower compression. All the E cams are basically the same.

All the 2,2 heads have the same valves and combustion chamber size. Ts and Es have the same port size as well.

Probably will need to do some upgrades to the carbs for the extra power.

Another thing that helps is a sport muffler and K&N air cleaners.
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Last edited by Trackrash; 02-10-2018 at 03:56 AM..
Old 02-10-2018, 03:52 AM
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Thanks Gordon. So if I use s pistons and E cams I need to swap to a S head with bigger valves? And I need to go with webers?
Old 02-10-2018, 10:26 AM
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Your Zeniths can be retuned to work with it. You don't have to do anything to the heads, but if you have them ported out to S spec you will get more horsepower from the build. You can leave them if it's not in the budget.
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Old 02-10-2018, 12:21 PM
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you can run any 2.2 or 2.4 P&C combo as piston pin is in same location. The difference in stroke was accommodated in the rods. t,e,s, pistons differ in compression ration and clearance in valve pockets. S pistons are forged. 2.2 compression will be stock with 66mm crank. 2.4 with 66MM crank will be about a 1/2 point lower and 2.2 with 70.4mm crank will be about 1/2 point higher. Port size relates more with cam selection. If using E cams you don't need to do anything with ports (T and E were same). Will probably need to rework carbs for new configuration for best power.

john
Old 02-10-2018, 12:40 PM
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Quote:
Originally Posted by Babuski76 View Post
Thanks Gordon. So if I use s pistons and E cams I need to swap to a S head with bigger valves? And I need to go with webers?
All the 2,2 heads shared the same valve sizes. You should be able to upgrade those Zeniths for your application.

FWIW. A good friend of mine has a '71 E. It has K&N air cleaners, sport muffler, S pistons from a 2,2, and PMOs. It sounds like a sport bike. A sweet running car.
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Old 02-10-2018, 05:05 PM
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Thanks for all the info. I will go for the E P/C and cam setup. But if I find find some S P/C I might try them with a E cam.
Old 02-13-2018, 05:22 AM
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The Zeniths in stock spec are jetted rather lean, ventury size is small,some said they were a low emissions carb if there is such a thing.
I rebuilt mine and went to 30mm venturies and finally settled on 125 main jets ,52 idle jets and left the air correctors stock,a good ignition system go's a long way to help with starting and general running through the power range,I have a good strong running motor for a 2.2.
I have never worked with Webers on a 911 motor but IMO the Zeniths aren't a bad carb but take a lot of tuning to reach that sweat spot.
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Old 02-13-2018, 08:18 PM
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@Porschetub
What kind of engine setup are you running?
I'm convinst I can use my zenith carb on a 2.2E P/C E cam setup, but I'm a little confused if it will run properly with a 2.2S P/C E cam setup and using a stock exhaust.
Old 02-14-2018, 04:13 AM
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Looking back This is what I would try,I would go for solex cams a bit more compression , larger venturis (30 mm) and slightly bigger jets(ask paul abbot). I lost the "sweet spot" by trying to mod the zeniths too much.
Old 02-16-2018, 09:26 AM
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Quote:
Originally Posted by Babuski76 View Post
@Porschetub
What kind of engine setup are you running?
I'm convinst I can use my zenith carb on a 2.2E P/C E cam setup, but I'm a little confused if it will run properly with a 2.2S P/C E cam setup and using a stock exhaust.
All you need to do is increase the venturis to 30mm and up the jets accordingly.
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Old 02-16-2018, 05:42 PM
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where do you find 30 mm venturies that fits Zenith cabs?
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Try alfa1750 on e-bay. Great service.

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