Originally Posted by boostingbackwards
Oh, so its just a dcr oil flow mod, cheaply. I can deal with that. The welds good and I've never had a problem all summer.
Question my oil pressure guage is bolted to the rear of the head, does this mod effect what my pressure readings are at? It currently says about 25 at idle.
Oil temp and weight of oil will impact the reading you will get. Thinner oil will show lower pressure readings, and thicker oil will show higher.
What's important is not so much what pressure it shows at idle, normally anything above 10-12psi is fine, but what it is at higher revs, say above 3500. If it plateaus and is below say 35-45psi, I don't anticipate any issues with lilfter over pump, but if you are seeing pressures above that, then you still may have some. Even if it is a higher reading, it won't hurt your motor perse, but you may have some valve bounce in the upper PRMs because of it, resulting in "choppy" dyno graphs up top. Does that make sense?
If that is the case, and you wanted to fix it, it would require you to resize that orifice to get the pressures you are after. What we do here is drill and tap the hole that is welded in your head (***Disclaimer, we do this on heads that are OUT of the car and can be cleaned throughly, do NOT do this in the car***)
for 1/8NPT, take a 1/8NPT plug and drill an orifice through it (3/32 to 1/8 depending on the setup) and then install the plug in the tapped hole. This now becomes a perfectly regulated orifice, and will cost you at most $1.00 for the set screw, and be under $10 if you don't have the tap too.