Procat gearing

[Medders]

Anyone know what gear ratio I should be using when running a saturn 540 motor?

I know it is sacrelidge putting one of those motors in the car but I think the 540 class at York is the only real chance I'm going to get to race the old dear.

[brian s]

for a 27t motor i would use a 28 pinion with an 89 spur , hope this helps.

[Medders]

It does !!

That was roughly what I was thinking, but means I need to find around a 38 tooth 64dp pinion. Not sure the motor will fit in then so perhaps its a smaller gear i need to track down.

[ScottyDogWoof]

wasnt stock on them cars 95 22 ??

[Medders]

i think thats what came with the kit but I think this was based on a modified rather than stock motor. Who in their right mind would have bought a procat back then and stuck a 540 in it :lol:

[Northy]

I can check what I'm running on mine wit the 19 turn in if it'll help? From what I remember it is the smallest spur I could find and the largest pinion that would fit (with a bit of transmission fettling) :lol:

G

[Medders]

Please do, your car was certainly quick enough.

I was running the small spur largest pinion in the 19t vintage too, 118/28 (64dp) but that was undergeared and lacked top end. I'm thinking 3:1 with the 540 but I checked last night and i won't be able to fit a larger pinion in, so I need to source a smaller spur that will fit onto the mms slipper layshaft.

[brian s]

95t and 92t spurs would have been run with a 22t pinion for 16turn or 17 turn (modified) motors back then.
i would think that the rw-racing spurs for the MMS layshafts are as rare as hens teeth now.

[Northy]

89/24 boss.

G

[Medders]

Cheers G & Brian, think I know where I need to get to now.

Those Spurs are probably about as rare as jobs for chartered surveyors at the momment :(:(.

Time to have some fun improvising a solution, plenty of time on my hands to do so ;)