as above what is the best size to get the most pressure to the calipers not to bothered about pedal travel .
would it be best using a 0.625 cylinder or a 0.750




also which will make my clutch pedal lighter 0.625 or 0.700 or 0.750

thanks for your info .

i used to run a 0.700 on clutch but the pedal was hard & the bite was at the top of the pedal i would like it lighter & bite a bit lower to the floor .

 

It's all about ratios, if you pump less fluid over the same distance the force will be less than a larger cylinder on the same clutch, so for less effort needed the smaller cylinder is what you need.
So a 0.625 will make your pedal lightest, but will it move enough fluid to work it fully ?
If it's on the same car/clutch that you mention having a hard clutch/high bite point, then using a smaller cylinder will make it lighter and move the bite point nearer the floor.
tabetha

 

thanks Tabs

 

on the clutch ive used AP 14mm cylinders before, makes them feel real nice.

but you also have to consider the calipers your using as to whether you can can enough fluid to them with the smallest master.

what ratio is your pedal box Andy ?

 

i got standard 4x4 cossy rear calipers wilwood superlite 4 pot calipers on the front & a tilton 6.5/1 pedal box .what is your 14mm cylinder equivalent to in 0.625, 0.700, 0.750.
thanks Mark

 

0.551 if that was possible in imperial lol

for your front i would put 0.70 and a 0.75 on the rear, if your running hyd clutch use a 14mm if you dont need lots of travel.

 

thanks again Mark you are truly a fountain of knowledge
the only 14mm master cylinders i can find are A P

unless some one can tell me where to get it cheaper.

 

lol AP are the only people who make the 14mm.

A quick story, years ago i built a car using girling masters, you know, the usualy £25 ones, they worked, did what i thought i needed, then I made some mods to said car and needed short bodies so used a mix of AP and Alcon masters, the differance was like night and day, so nicer feel, fit better have better stroke and last longer.

the moral of the story is .....................

All my cylinders are AP.
though Alcon and Brembo are also cylinders I would use, just not the girling things !