would 2.7 cylinder / piston kit fit 2.0

[Vintagemotion]

In order to rebuild a 1969 911T 2.2 engine I'm looking for the least expensive but quality cylinder / piston set. I noticed in the parts section that a 2.0 set of 6 cylinders and piston cost $6000+ the same set for a 2.7 is as low as $1200.

1. would a 2.7 or 2.4 cylinder fit a 2.2 block?
2. Do the original cylinders have a steel sleeve that can be rebored?

RJ

[Steve@Rennsport]

RJ,

85mm cylinders will fit a 2.2 case and so will 90mm ones provided that the case spigots are machined to fit., This is a very common procedure. You will also need to modify the heads to fit the bore size you will use.

Your stock 2.2 cylinders can be bored to accept an oversize aftermarket piston if you wish. Just remember that the OEM Mahle P/C's are FAR more durable than the cheaper JE option so you get what you pay for.

[kenikh]

Another consideration is the weak nature of the 1969 case. I'd just buy another motor (which is what I did ).

[Vintagemotion]

Originally Posted by Steve@Rennsport

RJ,

85mm cylinders will fit a 2.2 case and so will 90mm ones provided that the case spigots are machined to fit., This is a very common procedure. You will also need to modify the heads to fit the bore size you will use.

Your stock 2.2 cylinders can be bored to accept an oversize aftermarket piston if you wish. Just remember that the OEM Mahle P/C's are FAR more durable than the cheaper JE option so you get what you pay for.

Would the Piston/Cylinder Set of the 2.4L Mech Injection, (84mm bore), 911T (1972-73) fit my 2.2 case without any manipulation of the case?

Thanks RJ

[gsjohnson]

Apparently you don't have a matching numbers motor anyway. I'd search for another motor with the desired components that you're looking for and you may be able to mix and match much more cost effectively to get your desired results. I bought a 2.2 E motor and I am installing a 2.4/2.7 crank in it and getting exactly what I want in terms of power for less money.

[kenikh]

Originally Posted by Vintagemotion

Would the Piston/Cylinder Set of the 2.4L Mech Injection, (84mm bore), 911T (1972-73) fit my 2.2 case without any manipulation of the case?

Thanks RJ

Yes, they will.

[Henry Schmidt]

Keep in mind that if you run a 2.4 piston on a 2.0/2.2 crank you will reduce the theoretical compression by .5 to .6 points.
If you want to replicated the 2.2 T compression with a 2.4 piston you will need to use a 2.4 E piston.
Reverse the process 2.2 on a 2.4 crank and you get a higher compression ratio.
I.E.: 2.2 E piston on a 2.4 crank will yield a compression ration of around 9.8:1

A 2.7 RS piston with a theoretical compress ratio of 8.5:1 on a 2.2 crank will yield a theoretical compression of 7.9:1..

I use the term "theoretical" because every engine is different and Malhe is notorious for over rating their compression ratios.

The compression is also "theoretical" because dynamic compress changes with cam selections.

[Vintagemotion]

Originally Posted by Henry Schmidt

Keep in mind that if you run a 2.4 piston on a 2.0/2.2 crank you will reduce the theoretical compression by .5 to .6 points.
If you want to replicated the 2.2 T compression with a 2.4 piston you will need to use a 2.4 E piston.
Reverse the process 2.2 on a 2.4 crank and you get a higher compression ratio.
I.E.: 2.2 E piston on a 2.4 crank will yield a compression ration of around 9.8:1

A 2.7 RS piston with a theoretical compress ratio of 8.5:1 on a 2.2 crank will yield a theoretical compression of 7.9:1..

I use the term "theoretical" because every engine is different and Malhe is notorious for over rating their compression ratios.

The compression is also "theoretical" because dynamic compress changes with cam selections.

If I understand correctly I can use a 2.4 E cylinder kit with my 2.2 T crank and will:
1. Maintain the compression ratio
2. No machining on head or case to fit kit?
3. Use gasket set from 2.4E ?

Are the 2.4 E Cylinder Piston kits still available?

Thanks RJ

[deathpunk dan]

I was under the impression that no case work is required to run 85mm pistons on a 2.2T, just bore out the iron barrels. If this is the case, I'd do that and run JE 85mm E pistons with solex cams, stock rebuilt heads & E distributor. Rejet to suit.

Wouldn't that be the most cost effective move?

[kenikh]

Originally Posted by deathpunk dan

I was under the impression that no case work is required to run 85mm pistons on a 2.2T, just bore out the iron barrels. If this is the case, I'd do that and run JE 85mm E pistons with solex cams, stock rebuilt heads & E distributor. Rejet to suit.

Wouldn't that be the most cost effective move?

You are right. On the JEs, I'd buy them from Charles so he can make sure alloys and ocatings are the best suited for the application. I think your better bet is to buy JEs and QSC cylinders from Henry.

[Vintagemotion]

Originally Posted by deathpunk dan

I was under the impression that no case work is required to run 85mm pistons on a 2.2T, just bore out the iron barrels. If this is the case, I'd do that and run JE 85mm E pistons with solex cams, stock rebuilt heads & E distributor. Rejet to suit.

Wouldn't that be the most cost effective move?

Thanks for the detailed plan. Increasing the iner diameter of the original barrels from 84 to 85 would nt create thermal or other durability issues?

What is the difference of my cam to the "Solex cam" same question for the distributer?

[mspirito]

Will a set of 2.7 P & C fit a 1968 2 liter case and crank. Will a 2.4 P & C fit ?

[Steve@Rennsport]

2.7 (90mm) P/C's can be installed, however the case spigots must be enlarged to 97mm to fit.

2.4 (84mm) ones are a slip-in without any machine work.

[kenikh]

Originally Posted by Steve@Rennsport

2.7 (90mm) P/C's can be installed, however the case spigots must be enlarged to 97mm to fit.

2.4 (84mm) ones are a slip-in without any machine work.

You're such a kind soul...

[Lapkritis]

Originally Posted by Steve@Rennsport

2.7 (90mm) P/C's can be installed, however the case spigots must be enlarged to 97mm to fit.

2.4 (84mm) ones are a slip-in without any machine work.

Is it still recommended to machine these earlier cases out or is that being frowned upon as supply of unmolested earlier cases dwindles?

[Steve@Rennsport]

Originally Posted by Lapkritis

Is it still recommended to machine these earlier cases out or is that being frowned upon as supply of unmolested earlier cases dwindles?

Good question.

Since the majority of mag cases are now showing their geriatric condition and not good candidates for a hot-rod engine anymore, its questionable whether they are worth the cost of re-conditioning ($2K).

While the earlier aluminum cases are now quite rare and have some intrinsic value, especially for owner of SWB cars, I've see enough case cracking through the webs on race engines to make them suspect, too. It all depends on how much power is being put through them now.

At this juncture, I'm a bigger fan of using later aluminum cases for their sheer durability, although its not practical for engines under 2.8 litres.