I am seeking recommendations for a Subaru engine to go into a pre-emissions era Porsche 911 chassis with 915 type transmission, located in the US. It can be a four or six cylinder, normally aspirated or turbo type. The engine would need to have the following characteristics:

1) boxer layout, of course
2) known reliability
3) at least 220 HP, the more the better
4) readily available low-mileage engines and replacement parts in the US
5) has an ECU familiar to chip tuners (many features will have to be custom tuned out for this project, such as anything emissions related, transmission/AWD tie-ins, etc; optionally, if electronic throttle, should have a known modification available to possibly convert to cable throttle)
6) known or probable compatibility with Kennedy Engineering or other commercial clutches and adapters for use with Porsche 915 transmissions

I have a couple of ideas but don't want to taint the information flow.

Thanks

 

Hello from England!

I have a 1973 911 with a 3.2 flat 6 init, see opposite <

Several people have put the stock Sti 2 litre Impreza engine into VW type projects, so there will be a load of info in those 'areas' on the Web.

You need to watch for the direction of rotation of the Porche and Impreza engines when mating to the 915 box.
The 915 crownwheel and pinion can be reversed to get 4 or 5 foreward gears to suit the engine direction. (Porsche did this trick when making the 914-6 mid engined cars)

The Impreza engine is very much shorter than the 911 engine.
If you go for the Sti Impreza you will have about 250 bhp on your poor grade fuel.

The tech issues will be the clutch and mounting the engine cross member to the 911 engine bay, but i think you will find a Kit of sorts in the USA.

Major issue will be a radiator in the front of the 911 that will cool the engine yet not boil the occupants. Great winter heating though!

Good luck.

 

I was under the impression that all Subaru boxer engines rotate clockwise (unlike Honda engines, for example). If not, clockwise rotation should be added to the list of requirements!

Crossmember/mounting issues I can handle through local fabrication. The can of worms I don't want to get into is electronic issues - looking for a powerplant that can be swapped over with a minimum possible amount of chip retuning for the application. I am NOT a computer guru...

I hope someone can recommend a flat 6 Subaru engine, in a perfect world...I like low end torque. I don't have a problem with turbo 4s, though...

Thanks

 

Without trying to sound stupid, but why not drop in a 3.2 911 flat six, it comes pomplete with a free standing ECU and in stock form (in Rest-of-the-World spec) hits 230 bhp with a very fat torque.

The US 3.2 was much lower output I think in comparison. The 3.2 though can be taken out to 3.5 on webbers to startling effect.

My mildly modded Sti V3 hits 360 bhp/350 lbft torque from 2 litres though.

 

Heres a few sites that may help you...

Vanagons with Subaru WRX Turbo Engines

http://vwkd.co.uk/bb/viewforum.php?f=12&sid=befbd28ab8e5ba1c46f601edb56 1411c

http://bb.bbboy.net/vwengineconversi...wforum?forum=3

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