Hi Everyone,
I am looking at purchasing a new water pump and oil pump for the engine as the old ones are no good, and i was just wondering with the water pumps whats the big difference between the bypass and non-bypass type, and what one would best suit my engine and performance out of them.
Also with the oil pump, will the standard pin drive one do the job for my application or case.
I am running a 998 with 80thou oversize flat top pistons, hairy cam and intend on using it for hillclimbs along with occasional road use.
So can anyone that may know anything about them please help me out.

Cheers
Sav

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73 Clubman - Working Progress

Depends... Do you plan on runing a bypass elsewhere?

The difference is more or less only the bypass. Later 1275 engines (A+) had the bypass moved away from the waterpump (head's heater takeoff to bottom hose p.e. on the Rover Cooper).

Some say a bypass is not needed, just drill the thermostate - some say it's a must. I personaly like to always have water flowing at least a bit. With a drilled thermostate you'll always have some flow through the rad which can have some (unwanted) effects on the warming up of the engine... Might be not as big a problem in Oz as in chilly europe, though

There was a excellent thread about wheter to fit a bypass or not:
http://www.ausmini.com/forums/viewtopic ... ump+bypass

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No speakers, no bodykits, no six-inch spacers, no spak filler, no bullshit

Standard new 998 oil pump is fine.
It's the 1275 pin drives that are a problem (nobody can get these longer shaft ones apparently) so we've been converting them to take a slot drive 1275A+ pump..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I would suggest no by-pass on the pump. It causes cavitation, that's why the factory moved it further away from the pump in later years.

If you do want to run a by-pass, do it elsewhere and there are a number of ways of doing it.

I don't run a by-pass. Maybe in a colder climate I might, but even then, I'd probably use a radiator blind to reduce air flow through the core. I like a heater that, well, heats and it would help get the oil temp up.

As for the oil pump, as the Doc says, choices are limited these days. I pretty sure that they are all reasonable quality.