I'm asking because I now have 2 friends that had motors blown due to the oil pump failing. One is a boosted ap1 with about 80k miles, and the other one is an e85, cammed evo 8 with 130k miles. I am at 73k miles right now on my ap2 and in the process of collecting parts to turbo it as well. They tell me to learn from their mistakes and replace the oil pump now. What do you guys think? Is it a freak accident that they both had this happen, or is it fairly common?

 

I have seen very few gerotor oil pumps fail without some other issue. For instance a cam chain tensioner is failing the tensioner guide starts to wear the cars coolant and oil tend to run hot. Over time the material the chain guide is made of starts to get brittle and pieces break off. If it goes through the pump it will wear out or crack the rotors in the pump. So I would measure you oil pressure hot on the car before you start to modify it.

For instance on my car just running a supercharger at 13psi with a vented hood, upgraded cooling system and oil cooler I see coolant temps around 180-195f and oil temps between 205-250f depending on air temps and driving style. Now if I was making the kind of power I have without the supporting mods coolant would be 215-220f and oil temps could reach 300f and this is what kills motors over time that and spark knock. Just because you do ok on the dyno with a hurricane fan and the hood up doesn't mean that's what you will see in the middle of summer stuck in traffic so a good tune strategy is also important. My oil pressure at idle hot is between 13-18psi and running down the road 65-70psi. Before the oil cooler I saw 10psi idle with temps above 250f I also had oil consumption problems that stopped after I installed the oil cooler the vented hood dropped coolant temps and iat's 20f on a hot day good luck on your upcoming build I would also do a leakdown test to determine the health of the motor

 

What he said!

Shit even i learned something from that post!

Sent from my Samsung Galaxy S4

 

i don't know any specifics on your friends Evo but In general Evos' have oil issues because of how much oil is being sprayed into the head, sloshing on turns/launches..the fact that the oil pump is only designed for 8000 rpms.. I know some cars, by the time they get down the 1/4 they have already filled up a overflow can...but some cars are fine revving to 9500 rpms Lol. its hit or miss. generally oil pumps dont just fail and there are many other circumstances that attribute to it like s2kmaniac said


a friend of mine also had a brand new oem oil pump fail on him and destroy his motor in his evo


if i don't put a large stroker motor in my car that limits me to only 8500 rpms, i will probably put a dry sump system in my car, with a larger oil cooler and never have to worry again.


if you have AEM V2 you can also use their sensors as a fail safe in case you ever do lose oil pressure. an Accusump can help too but only if you're watching to begin with.

 

We have a customers s2000 in are shop right now and the oil pump chain broke. But I would have to say this is pretty rare.

 

Not common at all

 

It happened to a used f22 I purchased that only had 26k miles on it. Ran perfect with perfect comp and leakdown, really clean. Everything pointed to that mileage. Also the timing chain failed. Tore engine down and found the key way was missing from the front oil pump gear that drives everything. Not sure where it went or how any of this happened but it did. I only put 6k miles on that motor. $4k down the shitter. I kept the head and parted out the crank though so made a little back. Anyway sorry for the life story. Sucks to go through expensive misfortune that doesn't make much sense to learn anything from.

 

man that does suck almost sounds like someone was being a dick somewhere in the timeline of that motor

 

thanks for all the feedback guys, I'll definitely be doing a compression and leak down test soon