Need some, basic data Options

[Randal]

Weight of a (993) 3.6

Weight of a 915 transmission

Weight of a 930 transmission

Weight of a turbo subi

Weight of water/radiator for subi

[pcar916]

If my 993 engine was out of the car I'd weight it, but it's lighter than stock because I've cut off or deleted a lot of auxiliary systems like power steering pump housing and gear, the AC compressor (and mounting bracket) the heater and intake vapor-evacuation blower motors, and even the cruise control. My flywheel/clutch/pressure plate assembly is light as well at ~19lbs total with the early push-type clutch and a PM 6.75-lb DME flywheel.

That said you have to add the weight of the large external oil cooling system that has to be added (no onboard cooler). In my case that means the -12 and -16AN lines and fittings, and two oil coolers with associated ductwork. I'd guess the 993 weighs at least 75 lbs more than the 2.7L before it, and there is an estimated additional 25 lbs of oil system... then there's the added 18 quarts of synthetic oil.

The 915's weigh about 125 lbs. The mag cased versions are a little lighter, but not more than 10 lbs. I don't have a 930 in the shop to weigh, but a buddy in my neighborhood has a couple, one of which he uses in his McLaren reproduction build (from scratch BTW). I'll find out if he's weighed one of them and report back.

Regardless, add at least 10 lbs for the 108mm CV's/axles more than modified 914 axles with 944 CVs. I don't remember the weight of a complete 914-4 axle/CV assembly.

I'm still using a 914 transaxle with the 3.6 so I don't have the double whammy of a heavier engine/transaxle combo... yet.

Since the extra weight is unavoidable, I've installed the fuel cell as far forward (in the front trunk) as possible and still accommodate the front cooler ducting, and the battery and fire bottle is up there as well. That makes the balance as close to my desired 50/50 as I can make it. Geez, I'd replace the headlight motors, but then I'd have to add weight to the front!

Good luck

[Randal]

If my 993 engine was out of the car I'd weight it, but it's lighter than stock because I've cut off or deleted a lot of auxiliary systems like power steering pump housing and gear, the AC compressor (and mounting bracket) the heater and intake vapor-evacuation blower motors, and even the cruise control. My flywheel/clutch/pressure plate assembly is light as well at ~19lbs total with the early push-type clutch and a PM 6.75-lb DME flywheel.

That said you have to add the weight of the large external oil cooling system that has to be added (no onboard cooler). In my case that means the -12 and -16AN lines and fittings, and two oil coolers with associated ductwork. I'd guess the 993 weighs at least 75 lbs more than the 2.7L before it, and there is an estimated additional 25 lbs of oil system... then there's the added 18 quarts of synthetic oil.

The 915's weigh about 125 lbs. The mag cased versions are a little lighter, but not more than 10 lbs. I don't have a 930 in the shop to weigh, but a buddy in my neighborhood has a couple, one of which he uses in his McLaren reproduction build (from scratch BTW). I'll find out if he's weighed one of them and report back.

Regardless, add at least 10 lbs for the 108mm CV's/axles more than modified 914 axles with 944 CVs. I don't remember the weight of a complete 914-4 axle/CV assembly.

I'm still using a 914 transaxle with the 3.6 so I don't have the double whammy of a heavier engine/transaxle combo... yet.

Since the extra weight is unavoidable, I've installed the fuel cell as far forward (in the front trunk) as possible and still accommodate the front cooler ducting, and the battery and fire bottle is up there as well. That makes the balance as close to my desired 50/50 as I can make it. Geez, I'd replace the headlight motors, but then I'd have to add weight to the front!

Good luck

Great information!

Do you have to run one of those big oil catch tanks (Peterson) with a 3.6?

[pcar916]

Do you have to run one of those big oil catch tanks (Peterson) with a 3.6?

I'm running a stock 914-6 tank in the stock location and the engine is a '95 'cause I didn't want to install the second computer, and didn't want carbs anymore on this car.

Frankly, it would be a better weight distribution if I put a big tank up front, there's room. But it was just simpler to do it with the existing tank. Done again, I would run -16AN lines rather than the -12AN's for the main lines. I just put this in another thread, but the -16 has roughly twice the cross-section and will move more oil. My front cooler is huge and has -16 fittings I've choked-down to -12. I use -16 for the tank/engine return line and it would be -20, except that room between the tank and the suspension/engine is really tight in a non-tube-frame car. Even at -16 that little segment cost ~$290 for line and mandrel-bent fittings. -20 would have been at least another $100 - $150 and in 1998 my budget wasn't that generous.

Still, this system has served me well since then since the only modification to it was to add another cooler in the high pressure liquid-oil console at the little filter. I may not have had to do that either if I'd been willing to put fans on the big cooler up front. The 993 alternator is just fine with it.

The 993 is a wonderful engine, and the tools for the '84 Carrera are (mostly) the same ones I use for this car... and although they are different, they're both DME's.

I'm off on a 600 mile round trip in an hour or so in this car. Gas, check the oil and tire pressures, pack the requisite tools, put the top in the trunk and drive!