Oil Port#1 for 4G63T

[Nightjoker7]

Ya i think i saw it on dsm tuners or somthing. Dont really remember it was awhile ago.

[Goat Blower]

This is the first I've heard of oil pressure to the head being a problem. With ten parts cars popping up every day, I can't see why anyone would mill their head more than once where this would be a problem. In fact, the high rpm drag guys are getting too much oil pressure to the HLA's making them pump up and cause problems, hence modified restrictors being sold like the one Kiggly makes. That's probably why you haven't seen this mod before. I always chamfer both oil and water ports slightly after milling, but only for cleanup purposes. Maybe this is a good thing, I'm not sure.

[Kracka]

FP claims a lot of stockframe Evo turbo failures (although its only FP turbos that are failing which may be due to them not using OEM Mitsu center sections) are due to not enough oil pressure from the head, I can see this helping slightly.

[BogusSVO]

this is not so much about pressuer as it is flow, preusser is the amount of force needed to pass thu a clearance, flow deals with the amount

If the head has been milled, at this trough os now smaller, which should increase pressuer, but reduce flow

when this happens, lifter tick happens, and now also the turbo may be not getting enough oil ( for the guys that are set up 1g style from the side of the head.)

so when this mod is done it will restore the oil flow, and reduce oil pressure by a few psi

to help simplfy... at say 50psi, you can flow (GPH or LPH) more thu a garden hose , than you can a drinking straw at the same pressuer.

[Goat Blower]

What about negative pressure? I'm having a hard time getting enough Captain to flow through my straw right about now.

[blesi660r]

Ok i ahead of time apologize for bringing back the dead but I have a Q about this mod:

When doing the port on this how deap do you go, or do you not really go any deaper but just widen
the port like said and not ad any depth?

I would like to do this befor my head goes out to gosh for resurfacing.

[Goat Blower]

I just made mine a nice smooth transition instead of a hard 90-degree curve. You don't need to go that deep.

Speaking of that, I didn't notice any difference doing this, I still have a slight lifter tick and my oil pressure was still really high until I ported the beejeebus out of the oil relief valve. I just did this because it seems like a good idea and I port everything for smooth flow. Me and my cabinet of flapper wheels and bits are close buddies.

[blesi660r]

Lol. Thanks for the info, I'll just do a smooth transition of the port.

[blesi660r]

Should I go a little more ?? Not sure

[goodhart]

Looks like you could probably go a little wider if you wanted. Towards the right in the pic. Then smooth it out some.