13BTOY

iTrader: (1)

Okay, I'm getting ready to start my motor soon. Just waiting on a couple of parts and the completion of my charge pipe. In the meantime I have a question for the boosted guys about my oil lines. I drilled and stuck 2 nipples on the main runners of my intake(lower half) for my oil lines. Is this okay for a boosted application? I'm afraid that when the motor sees boost that it will keep the oil from getting into the motor. Any thoughts?

Thanks, Ed

steve84GS TII

Id be more worried about how well the oil is distributed into the air/fuel flow.

The 1st gen carbed engines place the oil nozzles near the venturies so the oil will directly mix with the heavy fuel spray that is exiting the bottom of the venturi.

The SE and later cars use nozzles which help atomize the oil and get it mixed into the air/fuel charge thoroughly.This of course only applies to the mainfold oil nozzles,the other two on the rotor housings, oil the running surfaces directly.

I wouldnt worry about boost pressure,the TII does just fine running oil directly into the pressurized secondary intake ports.But,if you are just running the OMP lines directly into holes in the intake manifold,without the factory delivery nozzles,then what's to keep the oil from just collecting on the walls of the port?Granted,itll eventually run down into the combustion chamber,but it wont be in suspension with the fuel,as it should be.
Id consider pre-mixing unless you can find a way to utilize the correct oil distribution nozzles.Its not worth risking a perfectly good turbo engine.Although inconvenient,premix gaurantees perfect oil dustribution to the seals and rotor housing surfaces.....

13BTOY

iTrader: (1)

This is what I was afraid of. I think I will utilize the nozzles on the housings and just use the 2 vac nipples that I drilled to hook up to the oil nozzles. This way oil will go directly to the housings.

Thanks, Ed

steve84GS TII

Thats how Mazda did it with the FD and Cosmo engines.Direct housing lubrication with only 1 hose/nozzle per rotor.The extra oil feeding into the intake manifold nozzles was deemed excess.