Motor suggestions? 3.3 for a 76 911
 

What would be suggested for a bolt in motor for my 76 911s? I believe the 3.3 is the biggest I can bolt right in without a conversion kit? Also what is the most durable trany I can put in to handle around 300-400 hp? A 86 911/930 trany? Suggestions please...I am going to rebuild a motor which I am currently looking for one and also a trany and would like to add a turbo. Thanks

n/a 993, blown 930 3.3

Depends on what is meant by a conversion kit. The 3.3s all came atteached to one version or another of the G50 trans. This means that unless a G50 will be used a 915 compatible flywheel, clutch, p/p etc will need to be used.
Any version G50. They are not easily transplanted though. I use a 915/67 w/ cooler w/ my 3.8Rs engine. Works fine.

I think Bill means: The 3.6s all came atteached to one version or another of the G50 trans.

For a 3.3 (turbo) the 930 4-spd transaxle can be swapped in as an alternative, but this is not trivial either, although easier than the G50 change.

klober23: what are your goals for the car? this will help people help you with your choices. If you search for "3.6 swap" or "engine swap" using the upper right you will find reams of information, mostly in the 911 Technical forum rather than the engine rebuilding forum, which is where we are here.

You will find that the costs for any engine swap giving a substantial power increase are quite considerable. Aftermarket forced induction kits are also quite expensive.

Here's a car that is local to me That uses a (originally) naturally aspirated 3.6 with JE pistons to lower the compression and a custom twin turbo setup, and programmable engine managment:

http://forums.pelicanparts.com/showthread.php?s=&threadid=136145&highlight=3.6+tu rbo

He started with a 78 or 79 930 so he already had a durable 4-spd, I'm not sure if he upgraded to a 5-spd G50. He has coilovers in the rear, so he may have.

Despite its racy looks, this is probably a rotten track car, at least without some development/sorting, which it hasn't had yet. The owner is a very nice guy, but I think he's more interested in going very fast (wherever) than going very fast around a race track.

The 3.3s came w/ 930/34 - /36 4 speeds which are Getrags using the same 240mm clutch & p/p design as the later G50 series cars. The G50 mod was the change from mechanical to hydraulic clutch actuation.

First question, what's your budget?

-Wayne

I would like to keep this drive train: motor, trans ax, trany around 12k. I would like a better than average 3.3 (some performance parts) with a turbo. The rest after the engine I know is a must and will fall into place. What am I looking at as far as a ball park in the conversion? Can a 915 trany be used for this? I want but do not have the budget for a 3.6 conversion. Am I correct in that the g50 requires a bell housing shorting or other mods? My 911's body and interior will be done in 2 weeks and I need to get a jump on this motor.

3.3 930 engine with 915 or short bellhousing (75-77) 930 transmission is bolt-on.

When using 3.3T mated with long-bellhousing 930 transmission (78-88), engine needs to be moved further back or torsion-tube modified.

930 4-speeds are strongest transmission Porsche ever built ( they are not made by Gertrag) and also quite cheap. Many people don't like only 4 speeds and long gearing though.

G50 transmissions are made by Gertrag and are somewhat less durable but easy-shifting (no more crappy Porsche synchromesh but BW conical synchros) and have 5-th gear. Strongest version is G50/52, which will hold for 600HP+. It cannot be mounted in the car w/o converting to coilovers and modifying torsion tube, or shortening the bellhousing. It's also quite heavy.

915 gearbox + 3.3T motor is also a bolt-on, but there are questions regarding reliability. There are some owners who use it and don't have problems. YMMV.

You might want to take that up w/ Paul Fr&#232re

my understanding is that earlier Porsche transmissions with Porsche synhromesh (901,915, 930) were made by Porsche themselves, and later were made by Gertrag?