Best case for stock 2.2S?

356KarmannSUPER · 12-10-2003, 09:46 PM

Stock MFI 2.2S motor, what is the best case to use? MFI, no mods, not historically important...

dtw · 12-10-2003, 10:52 PM

Small-spigot 7R mag case if you can find one. An early 2.0 case (sandcast aluminum) would be even stronger (and harder to find). For a stock/street 2.2S motor, probably overkill.

356KarmannSUPER · 12-13-2003, 12:34 AM

What years/models were those two cases installed in, dtw? Small-spigot 7R in 73T-CIS? Sandcast Al case: '64-68??? How much lighter is a 7R than the early 2.0 case? The early 2.0 case does not have oil squirters, correct? If the engine did not have oil squirters, would this affect anything long-term? 2.2S high-CR p's and c's will be used. I want the car to sound like the one in 'Le Mans'. The 2.2 I've heard is revvier, and I like that, but is it wise to build a high-CR 2.4S motor? Will the sound/other characteristics be changed, other than more torque, power? How much torque should I expect from a stock 2.2S? High-comp 2.4 torque? Lots of questions. Thanks

dtw · 12-13-2003, 05:58 AM

Those years sound about right- too early in the morning to dig through books. I have only seen the sandcast cases on stands and in cars; never lifted one. I really wouldn't consider the Al case an option for your application. It would need significant machine work and is overkill for a street motor. (Yes you do need the oil squirters, they drop piston temps at least 50 deg.).

Do a search on the "sport muffler" to hear some nice engines with sport mufflers. There's nothing better than the sound of those! Can't answer your torque questions with hard numbers, but I would advise you pull out the Bruce Anderson book and review some of the torque curves.

Bobboloo · Bobboloo's Garage

Small spigot 7R cases were the 73' CIS, and some late 73' E and S motors as well. Aluminum cases were 65' thru 67'. In 68' they went to mag. Piston squirters were first installed in 71'.

I think the small spigot 7R case would be ideal for your application but any of the 72'/73' 4R/5R cases would be fine too. Preferably from a T motor as they tend to survive better and require less work.

As for making free reving motors. You can also accomplish this by other means than just a short stroke. Lightweight forged pistons,chrome-moly rods and lightened flywheel/pressure plate are some possibilities.

jgparker · jgparker's Garage

356KarmannSUPER,

The early sand-cast aluminum case is about 22lbs heavier that the early mag cases. Any good 911 machine shop will be set-up to convert these for competition use (add squirters, oil bypass mod, intermediate shaft bearing, etc.) I know several guys that swear by these cases, but they are hard to find. They are certainly more durable than a mag case.

JP