Why 944 Mcyl vs 911?

[Humble]

I don't know the bore off hand but it is printed on the mc. I want to say it's 26mm and 20mm but I'll have to double check the mc to be certain.

[DORIGTT]

I've got the 4 piston 968 calipers that I plan to use.

[Humble]

If you know the caliper piston bores for front and rear i can tell you if it'll work with the 930 mc or not. I'd have to dig up the numbers for the 944t calipers again as well.

[Bugnutz]

the 944 master cylinder (thru 86, p/n 944.355.011.01) is 23mm front and 19mm rear.

[flat_iv]

Humble, what is the part # of the 930 master cylinder?

[Humble]

The part # I have is 930-355-011-03 and when I did a search I found it on pelican parts which is where I bought it

http://www.pelicanparts.com/cgi-bin/...911%20(1978-89)

As an update to my previous statements, I can lock up the front tires first with staggered rims and street tires. But when I toss on the race rubber it throws you against the belts and stops the car incredibly fast with hardly a peep from the tires.

[evilC]

The Porsche 930 M/C is a 23mm diameter (both pistons) model. The beetle standard one is 19mm diameter (both pistons) so it should be more 'powerful'. However, M/C piston size selection is very often down to the preference of the individual driver - power verses length of stroke.

Clive

[Humble]

What are the markings on the MC then? I thought those were the bore sizes

[effvee]

Hi, I have a 1302 that I am going to use the early 944 1985 single piston setup on. However I choose to use the front calipers on the rear also. So I will have all four wheels stopping with front calipers. Can you suggest a MC for me. I also have a 1971 Porsche book where the front calipers and rear are very close in sizing. I believe I need more than 19mm mc.