I did some more research on the motor that I'm getting - Its HVH250 90SOM which is Series wound, Oil Cooled. I need to figureout how to take care of Oil drains..Fascinating read about this on the motor forum- never seen these Remy motors before now. Appears that the highest output ones use active (forced) oil cooling, including flow between the rotor and stator if my brief scan of the thing was correct. Apparently they sell motors that are designed for 50% water/ethylene glycol (WEG) cooling which have sealed bearings, and oil lubricated + oil cooled units which give 40% higher heat dissipation performance because of the vastly greater surface area of cooling surfaces available when nonconductive oil is used as the coolant.
Which cooling system is your motor designed for? If it's one of the cartridge units and it's oil cooled, there's a whole lot of work required to integrate this into a housing, as the oil drains out of holes in the end of the motor cartridge...
Thanks Duncan.Hi
I don't think I'm an expert but here is my tuppence worth
Top speed - what do you want?
What is the motors max rpm?
Divide A by B - and you get your maximum reduction ratio
any greater reduction than that will reduce your top speed
Sit that to one side
Weight of vehicle (MGB) - weight on rear axle
Size of tires
My tires are almost exactly 2Ft in diameter - so each Lbft of axle torque = 1Lb of force at the road surface (and at the axle)
General rule of thumb road tires have a max coefficient of friction of 80%
So if you have 1000lbs on the back wheels the most force you can apply is 800lbs
So the most torque is 800ftlbs (2ft tires)
If your diff is 4:1
You need 200ftlbs at the motor - to MAX out less is OK
Just plug your numbers in - see what you want and then have a look at what you can get
I found out that I can swp the diff with a Ford 8.8 Diff. I can get the Gear Ratio of 5.71:1Hi
The MGB used a lot of Austin/Morris parts as MG was part of the Austin/Morris/Leyland.... conglomerate
I think you will be able to go to at least 4.4:1 with standard bits
And with the long history in motorsport there may be higher ratios available
It may be worth "Going Custom" as you will end up with impressive performance
