What is the safest option for an oil pump on a budget 25/30? The motor won't be revved above 7500rpm, the motor will be used with VCT, no oil squirters and I will have one block off restrictor in the head and an external oil return to the sump.
At the moment I have easy access to an rb30 NA pump, the stock rb25det pump or I also can get a hold of an rb30et pump. Now the problem is I'm not keen on using an rb25det pump as they have a larger gear width than the drive which requires a crank collar and this involves machining and as far as I've seen the only crank collars I've come across are for rb26? Do these also fit rb25?
The other option is using the standard na or turbo rb30 pump which I believe does not require a crank collar? Not sure if this true, but at least the gear width is the same. What I'm thinking is the rb30 oil pumps supply less pressure and flow than rb25det pump, which I'm not sure is a problem or not? Since it will not need to feed oil squirters.
Can some one clear this up for me... If the rb30 pumps do require a crank collar I'll be just as well using the rb25 pump. However at the revs and power level I'm aiming for maybe the rb25, rb30 pumps won't even need a collar?