390lb engine for my 930

[aftermath]

Well, dont mean to mislead, but Renegade Hybrids just announced a kit for a LS1 engine swap into a 911\930 instead of a SBC. I think thats over 100lb less than a SBC with aluminum heads ( ls1 is a aluminum small block ). Im going to reconsider changing my order with them. I know some of you hate the SBC idea, but I have no engine for this car and this is the type of engine I can actually work on...

[lin7310948]

i currently have a sbc in my 71 911 coupe...makes 475 at the crank. if you are looking for big horsepower i suggest that you have sbc engine built using an aluminum dart block and heads...maybe 427 cubic inches with 550 to 600 horsepower at the crank and run with a carburetor on 93 octane...you will need your 930 gearbox...course you can buy a ls1 very cheap but they only make 405 hp i believe.

[Porsche-O-Phile]

Buy a Corvette. Those "hybrid" cars ought to be blown up or at least driven into walls at high speed.

It takes no talent whatsoever to extract big power from a large displacement engine like a Chebby 350. Not to mention that a 911 simply isn't a 911 without that air-cooled, flat-six sound.

Whatever thrills ya' I guess, but the day the last "hybrid" Porsche disppears from the earth will be a good day, IMO.

If you really must have a V8, why not a 928 (preferably 32V) engine or a Cayenne turbo engine?

[lin7310948]

do you think that i built this car for you? i also have a 78 930...425 rwp...weighs 2350 lbs....prefer to drive the sbc powered car and it cost one third to build!

[turbo6bar]

Looks like a great engine. Should be gobs of fun. Go for it.

[Jim Bremner]

you can park your ls1 on my driveway....it won't leak oil

[Moneyguy1]

Depending on the amount of weight increase, your handling will change dramatically. Read "Unsafe at any Speed" and see the comparison of the VW Beetle (very small and light engine) vs. the Corvair ( much heavier engine with longer overhang) which had a very bad handling problem in its 1962-1964 iteration. Like a hammer on a rollerskate. If you have an opportunity, see if you can find one that has already been altered and drive it. (if the owner will let you!!)

Other than that, it sounds interesting, although if I were to do such a hybrid, I would have chosen a 944/968.

[turbo6bar]

If the engine truly weighs 390 lbs excluding the cooling hardware, I doubt it is any/much worse than a standard 930 engine. These flat sixes aren't known for being lightweight powerplants.

[sammyg2]

a stock 930 engine weights as much as an iron block 350 with an aluminum intake maniforld and headers, an LS1 is lighter than that. It will not have any negative affects on the handling, probably just the opposite. We should do our homework and obtain knowledge on a sugject before commenting on it so that we do not perpetuate urban myths.

I used to have a sbc powered 914. While i did not particularly care for the car's personality, I found myself constantly defending the car to people who claimed the handling was ruined. Total BS, it handled better after i got done with it than before.
So many people get into the "I read in on the net so it must be true" syndrome.

[Moneyguy1]

sammy..

A 914 conversion would be a mid-engined swap. THis should have minimum effect on stability. I drove a 1966 Corvar with a 302 in the "back seat" and was amazed at the handling capabilities.

Sorry about the weight confusion. I have no idea how much a 911 engine weighs. I was under the assumption that, as an air cooled unit, it would be relatively light in comparison to a water pumper.

My bad.

[lin7310948]

my car...71 rs lookalike...with stroked sbc was cornered balanced with 175 weight for driver....frt 494 448 37.6 %
rear 804 762 62.4 %

i have a 930 gearbox, aluminum trailing arms, 930 rear brakes and aluminum front cross member, 928 s4 frt brakes with appropriate sways and torsion bars front and rear. oil cooler in the rear passenger seat properly enclosed and fed from the quarter panel window with two 3 inch naca ducts. period correct recaro seats, gauges converted to sbc needs. i run 7 inch by 16.. 951 fuchs in front and 9 inch in the rear... car has cibie driving lights, thru the grill fogs, and h1s, and six point harness.

these conversions can be done correctly and you can have a well handling, powerful vehicle. my car does have aluminum heads but a steel block. next engine will have an aluminum dart block that would remove approximately 90 more pounds from the rear. i am not a track guy but the car handles well enough for me..twistees or straight! by the way, i did all the conversion work myself utilizing renegade hybrid adaptors, radiator, etc. by the way the car is not cut up and would be quite simple to return to original form...rs rear flares are much more work to remove than correcting the front latch panel which has been cut for a 6 inch by 20 inch air opening to the radiator. car cruises at 70 mph at 2200 rpm in fourth.

[dd74]

Damn! And I was just in Las Vegas over Thanksgiving where Renegade is located. I would have loved to see this conversion.

The aluminum V8s are feathers compared to the 930 turbo motors, so if at all, I would say with the aluminum V8 engine pictured, a regular 930 turbo would be toast.

Maybe a beefed up 4-spd might be needed, and of course, wider wheels/tires.

I've read only one track test with a PorChev, which had a 915 gearbox. The car was sick fast, and sure, held no value after the conversion...but who cares about value.

[kaisen]

I've posted many times about the GM LSx architecture V8s.

Yes, they are significantly lighter than the stock 930 motor. You need a pretty stout transmission to take the twist.

Are you thinking 'stock' (used?) motor or building one up? I'd be happy to lend my input.

E

[dd74]

Originally posted by kaisen
I'd be happy to lend my input.

E

Here's my idea - if I ever do such a thing. Buy a junked up 911 - put turbo or RSR flares on it, wide wheels; probably 17-inch, and the above motor, or something like it.

My question is what 5 spd. transmission would work with it. If need be, yes, I'd use a 4 spd from a 930, but could that transmission handle 400 hp? Or 500 hp?

New or used engine? How much to rebuild? Any flaws in the engine that I should know about?

Also, suspension - with this conversion, probably some 31 mm torsions in back, 23mm in front. Konis or Bilstein Sports all around.

Main question: is the 911 even a good starting point for such a conversion? Or would something like a Miata be better? I know both the Miata and 911 are worlds apart, but I'm looking for bang for the buck.

I'm not interested in a 914 conversion as of yet. But I'm willing to listen to those who support such conversions.

[UconnTim97]

Renegade makes a conversion for the 944. You can pick up one with a blown engine on the cheap.

Just a thought.

[speedracing944]

V-8 converted P-cars can be a blast to drive. I don't know much about the 911 swap but I am currently building a Corvette LT1 944. I will not be using the Renegade Hybrids kit but will be building the kit myself. If you get bored you could always turbo the V-8!

Speedy

[speedracing944]

BTW have you checked out www.porschehybrids.com ?

[David]

The 944 idea sounds interesting. Next project perhaps?

[Az911]

Originally posted by dd74

My question is what 5 spd. transmission would work with it. If need be, yes, I'd use a 4 spd from a 930, but could that transmission handle 400 hp? Or 500 hp?

A 930 with a k27 makes over 400hp so I would say the 4spd can easily handle over 400hp.

[dd74]

Originally posted by 125shifter
The 944 idea sounds interesting. Next project perhaps?

Yes, it does sound interesting. I didn't think of the 944. Are the V8s offered lighter than the four cylinders? I'd worry about weight/understeer.