Oil Pump Upgrade?

[Rick B]

Good morning to all. I have realized that I forgot to consider an oil pump upgrade during my engine re-build. I am building a 2.380 L (nickies / JE 9.5:1) on a 1970 2.2 case. I will install an exterior oil cooler, probably in the front. What is the pump that I should use? Is the 2.7 pump the right one? Can I find a used pump or is it cheap insurance to spend the $1,000 for a new pump, install kit, and new sump cover? My old pump appears to be OK - no obvious problems, spins smooth, looks good.

Thanks. Engine case now at Ollie's, so still time to update the case. I am having the oil bypass mod done.

Rick

[Steve@Rennsport]

Rick,

I would be using a Carrera pump (or a real nice used SC one) and the appropriate sump plate to match.

Those hold better hot oil pressure than the magnesium pumps.

[Eagledriver]

Don't forget to do the oil bypass modification.

-Andy

[thor]

hello ,

what are the consequence not to do the oil bypass mod ?


thanks

[Eagledriver]

If you don't do the bypass mod and you use a newer pump, your case will not scavenge as well. You may have a problem with the case filling up with oil and the tank running dry. The later pump has an increased pressure section at the expense of a decreased scavenge section. A case without the mod dumps the pressure relief oil into the bottom of the case where it must be pumped back out by the scavenge pump.

-Andy

[Flieger]

Low oil pressure, too.

[Eagledriver]

Flieger is right that the later oil pump will give higher oil pressure, however the oil bypass mod doesn't change the oil pressure (unless the tank goes dry.


-Andy

[Flieger]

I think I might have misread the question. I was thinking that if you did the oil bypass mod but used the early pressure spring, you would have low oil pressure. I guess the later spring would be part of the mod.

[thor]

many thanks
i will do it. After some research i find here in belgium a guy who has done it regularly...