hello all
one for the tubo guys again, just wondering what size oil fed your using on your turbod m20.
iv had a bit of a search on net and on here but cant seem to find any info. your help will be much appreciated,.
if you could let me know where you got it from that would be great to, cheers
turbo oil feed size
Moderator: martauto
Depends on whether its a journal or ball bearing turbocharger. My experience is with Garrett turbochargers, and they typically require no smaller than a 1.5mm orifice if it's a ball bearing turbocharger, and no smaller than 2mm if its a journal bearing. They only ever recommend fitting a restrictor at the inlet to a journal bearing turbocharger if you do actually pick up problems with oil pushing around the seal, which is of course largely dependent upon your oil pressure.
"It is amazing how many drivers, even at the Formula-1 level, think that brakes are for slowing the car down." - Mario Andretti
cheers Geoffbob
im using an hx35 but iv read that it needs a 0.8mm restrictor in the feed and a 19mm return. dont suppose you know where i can get the oil retun flange from.
would oil pressure differ between m20 engines, or are they all the same.
also iv read that the oil return from the turbo can not be pressurised but with the way the m20 inlet manifold is set up for breathers, when the turbo is boosting wont it presurise the crankcase.
thanks again.
im using an hx35 but iv read that it needs a 0.8mm restrictor in the feed and a 19mm return. dont suppose you know where i can get the oil retun flange from.
would oil pressure differ between m20 engines, or are they all the same.
also iv read that the oil return from the turbo can not be pressurised but with the way the m20 inlet manifold is set up for breathers, when the turbo is boosting wont it presurise the crankcase.
thanks again.
0.8mm is not correct FIY.
You need to block off the vacuum hose from the valve cover to the throttle body,
the big black pipe to the manifold is not connected to the manifold actually.
you can run a HX35 off a something like a 3mm restrictor if any.
ebay for the drain flange.
You need to block off the vacuum hose from the valve cover to the throttle body,
the big black pipe to the manifold is not connected to the manifold actually.
you can run a HX35 off a something like a 3mm restrictor if any.
ebay for the drain flange.
I'm in agreement with Gunni on this, 0.8mm sounds way too small to me. Ball bearing turbochargers require very little oil (in fact, too much will actually slow them down) but a journal bearing turbo (unless it includes a water jacket for cooling) is typically installed without any form of restriction. It is only at such point as you run into issues with high oil pressure and oil pushing around the oil seal that you need be concerned with installing a restrictor.
Oil pressure on any engine is a function of engine speed (rpm) but shouldn't differ between any two M20's assuming identical condition/setup oil-pumps and no dirt/shavings in the oil ways.
So long as your oil drain from the turbocharger is large enough it will drain under gravity back to the sump. You would require a huge amount of pressure in the crankcase to stop the oil draining. However, if under any circumstance the oil is able to accumulate/pool around the bearing, due to say a poor or obstructed drain (regardless of pressure), it will begin to seep around the seal. As for crankcase pressure, you would not under any circumstance want to pressurise your crankcase by connecting your valve cover to your inlet manifold, not on the M20 or any other engine for that matter. Aside from the fact that your engine will attempt to leak oil from every possible orifice (as well as potentially launching your dipstick out like a spear) it’s an awful waste of good boost pressure. As a general rule you should do everything within your power to keep the air pumped by your turbocharger going nowhere else other than into your combustion chambers, anything else is a waste.
Oil pressure on any engine is a function of engine speed (rpm) but shouldn't differ between any two M20's assuming identical condition/setup oil-pumps and no dirt/shavings in the oil ways.
So long as your oil drain from the turbocharger is large enough it will drain under gravity back to the sump. You would require a huge amount of pressure in the crankcase to stop the oil draining. However, if under any circumstance the oil is able to accumulate/pool around the bearing, due to say a poor or obstructed drain (regardless of pressure), it will begin to seep around the seal. As for crankcase pressure, you would not under any circumstance want to pressurise your crankcase by connecting your valve cover to your inlet manifold, not on the M20 or any other engine for that matter. Aside from the fact that your engine will attempt to leak oil from every possible orifice (as well as potentially launching your dipstick out like a spear) it’s an awful waste of good boost pressure. As a general rule you should do everything within your power to keep the air pumped by your turbocharger going nowhere else other than into your combustion chambers, anything else is a waste.
"It is amazing how many drivers, even at the Formula-1 level, think that brakes are for slowing the car down." - Mario Andretti