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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, 12:49 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 02:56 AM..
Old 02-10-2018, 02:52 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, 09:26 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, 11:21 AM
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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, 11:40 AM
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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, 04:05 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, 04:22 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, 07:18 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, 03:13 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, 08:26 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, 04:42 PM
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where do you find 30 mm venturies that fits Zenith cabs?
Old 02-22-2018, 12:33 AM
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Try alfa1750 on e-bay. Great service.

dho
Old 02-22-2018, 11:59 AM
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A year have gone doing anything else but fixing my 911 engine.
But I have bought some 2.2 S cylinders bored to 85 mm, and some W÷ssner 85 mm pistons 10:5;1 compression. I would stil like to do an upgrade to my 2.2T engine, and use the stock heads, the stock exhaust, the stock Zenith but will go for a E or a solex cam.
I'm still on a low budget - an hope to have a street frendly engine, but will it work?
I'm a little worried at the high compression is it a detonation hazzard?
Anything else I need to be concerned about?
Thanks Rasmus
Old 01-28-2019, 06:39 AM
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You will have problems with 10.5 compression. I'm not familiar with those exact pistons, but I would measure them carefully, to make sure they are usable AND measure the dome volume to accurately determine what CR they actually would create. Some pistons, not sure of these, will not have the advertised CR. If you can get down below 10 to 1 with thick base gaskets, possibly some machining, AND the pistons are usable you could be good to go. Check out this info. Evaluating Used┬* Pistons:┬*How to Determine if Your Pistons Are Still Good
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Old 01-28-2019, 08:27 AM
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It is these pistons https://www.*****************/fu/prod132493/W-ssner-Forged-Piston-Kit-Porsche-911-S-22-12v-1969-70--180PS-/
How is it possible to make the CR less by machine? do the grind some of the piston top off?
Both the pistons og cylinder I have, have driven 2 hours - so more or less brand new.
OR I could let them be 10.5:1 and make dual plugs. But i'm of the impression it will cost alot? but would I gain so much more hp and torque for street use to make it favorable? Still wan't to use a E cam, and the T heads and zenith if possible.

Will you recommend an other route making the best bang for the buck, when I have the stock 2.2T engine and the 85 mm S cylinders and the 85 mm 10.5:1 pitstons?

Last edited by Babuski76; 01-30-2019 at 04:23 AM..
Old 01-28-2019, 01:39 PM
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I'm still thinking on what to do. Then engine is now taken apart (not the case) so I have to choose what to use P/C wise. As I have some almost brand new 2.2s bored to 85 mm cylinders and the almost brand new w÷ssner 85 mm 10.5:1 pistons I Wold like to use the. But I don't think I have the budget to go dual plug ( what's the cost on that?), sň I have to adress the compression. Is it posible to use the w÷ssner pistons with the standard T head, if I use a thick base gasket - what is the thickest I can use? Is it a bad decision to machine the pistons ( anything I have to be consern at doing that?) Is it better to buy som 85 mm 9.5:1 JE pistons?
Thanks for all your advices.
Old 03-22-2019, 01:21 AM
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Only way to know, is to assemble and measure.
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Old 03-22-2019, 02:20 PM
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From my experience the Wossner pistons were not actually 10.5 to 1 . I think I only needed to add .5 mm of cylinder base shimming to get a ratio of 9.5 to 1 . You must of course do the math . Wossner has the dome volume specs , my 84.5 mm piston was
29.4 cc .
Old 03-26-2019, 08:32 PM
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Zenith carbs can be made to run very well. There is a great thread on here with an owner who did lots of air fuel ratio testing. Using that info I rebuilt my Zeniths with larger venturi and new jets. A bit of dyno time to dial it in and my 2.2 runs better than I ever imagined. Just takes a bit of time and effort and not much $$ compared to most P car mods.
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Old 03-26-2019, 10:17 PM
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