Camshafts and pistons

[M491Cabriolet]

Hello! I was wondering if camshafts with the part number "901 105 183 OR" and a Bosch distributor with the part number 0.231.169.011 are OEM 911S parts. Any advice would be greatly appreciated.

Also, I was wondering if anyone might know what effect rebuilding a 911T 2.4 engine with 2.2 911E pistons and camshafts would have. Would this be a positive step in terms of performance and compression? I know 2.2S pistons would lincrease the compression substantially from the stock 7.5 of the T pistons.

Another option I have instead of the 2.2E pistons is to use 2.4 911S pistons and E camshafts. I also have the above cams, but am afraid the drivability (99.9% on the street) would suffer. Anyway, I don't know which would be better.

Also, would the use of the above distributor on my stock or modified 911T engine provide any improvement?

Final question... Would any of the above modifications on a engine needing a rebuild anyway negatively impact the value of my 1972 911T coupe?

Any help would be greatly appreciated! Thanks in advance.

[BK911]

2.2E pistons will give a higher cr than 2.4S pistons, about 9.1 vrs 8.5. With E cams will be an absolute rocket. If anybody drives the car they will not be able to wipe the smile off their face long enough to talk about any negative impact on value. These are 'simple' bolt ons that can easily be converted back if a future buyer wants a slower, original car. Do it!!

[M491Cabriolet]

So lemme get this right... I don't understand something... Because the 1972 and 1973 911S had a lower, 8.5:1 compression ratio than earlier cars, are 2.4S cars less of a kick in the pants to drive than the earlier cars? See, I've never driven an S. I used to have a 1972 911E coupe, though. So, my idea is to use 2.4S pistons with E cams and MFI. I know the MFI may need tweaking, but I'll worry about that later. Does this sound as good to anyone else as it does to me? I also have a set of cams I believe are OEM S cams, but am heavily leaning toward opting for the E cams to make the car more all-around-fun to drive. Would the addition of an S distributor give me any benefit?

Also related to the above, I'm really interested to know if anyone knows if camshafts with the part number "901 105 183 OR" and a Bosch distributor with the part number 0.231.169.011 are OEM 911S parts.

Thanks very much for all your advice.

[RetroSC]

Not necessarily. The 2.4S still had 10 more HP, but a longer stroke motor so a little different character. Tomato, tomotto as they say. A common upgrade for the 2.4S motor is to swap 2.2S pistons thereby raising compression and adding a few more HP. As said above, 2.2E pistons will even raise the compression a bit versus 2.4S pistons. I'd only do that if I had 2.2E pistons on hand. If you've got to buy some you might as well go 2.2S pistons and E cams.

Not sure about the distributor but I'd match that more with the cams than by piston choice. I'd guess the advance curves are more in line with the cam's lobe than anything to do with compression. So an S cams is going to work better with an S distributor curve and so on.

Bill

[BK911]

I seem to remember all the 2.4 dizzies have the same advance curve.

The cam is a left side S cam from a 911/53 engine. The right side should have a different number.