So I've had this motor for 2 years already about 6k miles and I've ran am soil 20w 50 in it the whole time and my oil pressure has been fine about 25 psi at idle 80ish cruising. ..

But as of today I fixed some oil leaks that just started then my local store was out of amsoil so I bought some valveoline 20w 50 and now my idle oil pressure is 65-70 when warm and high 90s cruising. .. only thing I've changed was I switched to an OEM oil filter and the oil brand

If it matters.
I have an aftermarket oil cooler.
Balance shaft delete
And the oil pressure Guage is Aem. With the soft mount kit.

But I've had them before and pressure was fine. What could cause this? And is it fine to drive like that?

Thanks in advance

 

Also I've had my front case off to re weld the -12 bung in my balance shaft hole for crank case relief(but that also was there before with no oil pressure issues).. could of the oil pump relief spring be damaged? Maybe pump going out?

 

as i am sure you know 20-50 is a heavy/thick oil, more so as a non synthetic--that's what your experiencing. Either scale back to say 5-30 as OEM weight or move back to a synthetic which will help some--- synthetics just flow better. Dino oil is thicker by definition. Or run what you have

 

Have you called Buschur? 20-50 isn't too high as it's what recommended by Dave to use in his engines. The builder knows best. I think you're 100% best option is to call and speak with Dave directly and he can give you the best advice.

 

Its a little high, but I don't think that should cause issues. Its likely from the oil and the oem filter. You should be fine though

 

alright thanks for the replies. i forgot to mention this Valvoline 20w 50 is full synthetic as well. ill give buschur a call and see if i can figure anything out.

i just found it odd that a brand of oil thats the same weight can cause the pressure to rise 35 psi at idle from what it was before (well that is, if its my problem)

 

I put VR1 20w50 in my engine and I utilize the OEM oil filter and my oil pressure doesn't go as high as yours. At idle it's around 25-30 I think, and cruising is around 80 IIRC.

 

to lower the pressure you need to reduce the spring length. Reducing the spring length should have little affect on idle pressure, but will lower WOT pressure. I ended up taking 0.125" and that has given me 80psi at WOT, but still 20psi at idle.

 

If Dave says it's okay, then it's okay. I'd contact him.

Another option if you are not satisfied would be the link below.

https://www.evolutionm.net/forums/ve...pump-gear.html

 

I assume you're talking about the spring in the ofh? Have any pics? How many "circles" did you cut off? And that only affects oil pressure at cruise/WOT, not at idle?

 

Given the fact that 15w-40 WITH an oil cooler is as thick as 20w-50 WITHOUT a cooler, you're fine running 15w-40. I realize that Buschur calls for 20w-50 but they also run without oil coolers....it's easy reverse engineering.

 

I ported the relief in my OFH. I have the BS deleted with a custom machined front shaft, deleted oil squirters, and no oil cooler and it works fine on my engine. Oil pressure is RPM related so giving those figures with the oil pressure will give a better idea where it's at.

 

Yes, the oil pressure spring in the filter housing. Just measure the overall length of the spring before with calipers and then remove length. You can buy a few extra springs from the dealer for ~$3/spring if you want a backup.

 

Do you have a part#? And anyone have pics of their ofh that has been ported? Any pressure numbers to go with the pics?

Thanks

 

No its not a full synthetic it is still a group 3 oil which per the API they can call it a full synthetic but there are still petroleum by products. It would have to be a group 4 or above to be a true full synthetic. .. but this do t matter, Dave builds his motors to handle 20w50 he is well know for building his engines loose therefore is why I believe why most of his motors loose a few drops of oil here and there.

You issue I believe comes from the filter. The bypass spring load in the filter are different from filter brand to brand and can cause drops or spikes in oil psi.