early 944 brakes, stock MC....dosent feel right

[Pillow]

I stand corrected after doing the math. The standard 944 N/A setup seems to be a good bias as compared with the early 911s 1.60 bias.

Just for the record 911 SCs (20.64 master with 48/42 calipers) had a 1.31 bias BUT used a rear preasure regulator that cut in at 33 bar. From "Porsche 911 Performance Handbook" by Bruce Anderson page 216.

... More to come, but I am thinking a 944 MC (23/20) with 911 "A" caliper front (48mm) and 944 rears (36mm) might work well with a 1.34 bias. Very rear heavy for a streeter though I think..?

Thanks,

[Jeza]

Adrian

That combo sounds almost perfect

I thought the CB kit was very similar in bias

Keep us informed with how you get on.

Cheers
Jeremy

[Wally]

Originally Posted by Pillow

... More to come, but I am thinking a 944 MC (23/20) with 911 "A" caliper front (48mm) and 944 rears (36mm) might work well with a 1.34 bias. Very rear heavy for a streeter though I think..?

Thanks,

Be sure to be accurate with your calculation since AFAIK, 23/20 944 MC doesn't exist. In europe all I've come across is 23/19...

Also my 944 rear isn't 36mm, but 38mm IIRC

Differences in diameter quickly add up in a cross section (surface)!

Good luck,
Walter

[MattKab]

'23' is more like '24' from 25.4(15/16") = 23.81mm, you knew that..

Matt

[Pillow]

Good feedback guys!

As for the 944 MC I got this one off a '87 944S model and it is cast into it "23" on one side and "20" on the other. Maybe this is different than the early 944 '83-'86 MCs?

So the 23 is really 23.81, Jess that really does throw the numbers a bit

Okay so the 19 or 20 will realy be either 19.05mm (12/16") or 20.64mm (13/16").

I went and measured the single piston 944 calipers (again from a 1987 944S) and I found them to be fairly spot on to the 54mm (53.975) front and 36mm (35.56) rear. Wally I am not sure why yours would be different in Europe?

Thanks,

[Wally]

Yes, that is weird.
Weirder is that my early 944 M/C has 23 cast in into the M/C housing for front and 19 cast in for the rear. This would 'suggest' a 'perfect' 23,00 mm and a exact 19,00 mm.
I haven't taken it apart to verify this tho (and its on the car now)
Maybe there are more different sizes made to suit different countries...who knows?

Best regards,
Walter

[Richie]

Hello,

I have lent (sp?) my aluminum 944 Turbo MC to a friend but I hope to get it back one of these days.
Not sure anymore what it said on the outside but as soon as I get it back I'll take it apart and measure the pistons.

Cheers,
Richard

[judgie]

my 85 944na m/c is 23mm/19mm.why would the bores be 12/16" when origenaly from germany and would be metric.
the bias realy is a presonal thing , i run 85 na brakes all round and have the 23 to the rear and 19 to the front with 7x16 205/55/16 front and 8x16 225/50/16 back.works spot on for me.
cheers rob