Light Weight

Sorry for the length of this but I have a lot of questions.

I have a 1968T with a later 71 2.2 that I am about to start tearing down for a complete rebuild. I plan on upgrading the motor with S pistons etc to get the horsepower I want.

I also want to reduce the weight of the car as much as possible. So some questions for those of you who may have been thru this, or have a stack of parts that you could check weights on.

1. Wheel/Tire weights. What weighs more, rubber or metal? More precisely would a set of 15"x6/7 fuchs with tires (assume 205) weight less or more than 16x6/7 with a similiar sized tire.

2. My T has cast iron cylinders, do Nikasil cylinders weight less? Does the forged crank weight less than the cast one used on the T engines. Do the after market pistons like JE weight any less/more than the Porsche ones.

3. Does the 5 speed 901 transmission weight significantly more than the 4 speed. Also in reading the Haynes chapter on rebuilding the 901 is seems that the 4 speed does not have any gears except reverse hanging outside the main case. Hence the 4 speed shouldn't be subject to the problem of breaking first gear off under heavy exceleration (as Bruce Anderson as mentioned is possible with higher horsepower)

4. Any one have experience with using carbon fiber parts on a street car? Paint cracking, fitment etc. If I used carbon could I leave it unpainted or would it warp in the sun.

5. Interior. My dash is badly cracked, I was going to replace it with a later model, however I could also put in a carbon fiber version. Any experience with this?

Any other suggection for lowering weight which doesn't cost $10 a gram? (The normal cost on a mountain bike

Robert
1968T (soon to be in pieces)

Robert,
Look at my post, "What's It Weigh?" It might have the answers you're looking for.

Sherwood Lee
http://members.rennlist.org/911pcars/

Check out the newest copy of Excellence. A guy put his 911S on a severe weight loss diet with great success. The article goes through the cost per pound on many of the components.
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Paul
78SC Targa

Hello

1.) Rubber wights more
2.) Yes, No , but near similar, check it out
3.) No, Tourque load is limitet use small rubber or drive sensitive. Normaly the problem starts with an 3,0 L 220 HP engine
4.) Depends on the quality from the manufactorer, good made parts are very expensive. I would prefer to paint them for additional protection. Clear color will work.
5.) the factory covered it with thin carpet.

68 ?

Bare metall overall, no sounddeadening. Lightwight R bumpers and rear valance. R-rearlights. Race seats. Swap to plastic aircleaner and fiberglas engine sheetmetal, delete any heating. move CD unit inside car, lightwight flywheel ( must be matched to the crank especially if you use a "T" crank ), move oiltank to fronttrunk or to 72 MY position. Aluminium lid´s and doors, change to 73 on frontaxle, plastic windows or at least early thin glas ( No rear defogger ) change Window winder to strap belts. delete Clock, Sunvisor, glove box door. Delete remote lid opener and swap to pin looks. Cut portion from the rear inner quarter ( enginesidewalls ) away ( for experts only ).

Just look for factory lightwights and try to find the difference

The overwight on the rear is the most important. Also rotating mass to the min.

Grüsse