LOL 
LQ4 into a 3rd Gen/1972 Nova
11 Second Club
Joined: Mar 2008
Posts: 445
Likes: 1
From: New Westminster, B.C., Canada
I agree with tiresmokin. O-Ring on tube first. If you put it in the pump first there is a pretty good chance that the tube will push it into the pump and give the classic low oil pressure symptoms. The oil pump swap is a good idea, but a lot of work. You can also get away with doing the spring swap in the pump which you can do without removing the pump IIRC.
My turbo's do the same thing as far as free-spooling. I was concerned at first because one was less spinny than the other... after some use they break in I guess because they spin ok now.
My turbo's do the same thing as far as free-spooling. I was concerned at first because one was less spinny than the other... after some use they break in I guess because they spin ok now.
Thread Starter
Joined: May 2007
Posts: 1,806
Likes: 46
From: Vancouver BC, Canada
I agree with tiresmokin. O-Ring on tube first. If you put it in the pump first there is a pretty good chance that the tube will push it into the pump and give the classic low oil pressure symptoms. The oil pump swap is a good idea, but a lot of work. You can also get away with doing the spring swap in the pump which you can do without removing the pump IIRC.
My turbo's do the same thing as far as free-spooling. I was concerned at first because one was less spinny than the other... after some use they break in I guess because they spin ok now.
My turbo's do the same thing as far as free-spooling. I was concerned at first because one was less spinny than the other... after some use they break in I guess because they spin ok now.
And "less spinny"... is that a technical term??
Another vote for the o-ring goes on the pickup first, then into the pump. I don't know if that's causing your problem, but if the o ring is extruded or pinched weird, you'll probably see it when you pull the pickup off.
I worked at Garrett turbochargers for a while doing rotordynamics and developing bearing systems for advanced dual compressor diesel turbos, including this sequential turbo for Ford which had some rather interesting rotordynamic challenges with all that overhung compressor wheel mass. With this qualification under my belt, you should believe me when I tell you that "spinny" is of course a technical term. It's defined as the third term inverse hypothetical integration constant of the fifth order bipolynomial fourier expansion summed over the square root of the algorythm for determining horsepower where torque and speed are multiplied to produce grin and tire smoke.
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Verdad Gallardo 11 Second Club
Joined: Mar 2008
Posts: 445
Likes: 1
From: New Westminster, B.C., Canada
I worked at Garrett turbochargers for a while doing rotordynamics and developing bearing systems for advanced dual compressor diesel turbos, including this sequential turbo for Ford which had some rather interesting rotordynamic challenges with all that overhung compressor wheel mass. With this qualification under my belt, you should believe me when I tell you that "spinny" is of course a technical term. It's defined as the third term inverse hypothetical integration constant of the fifth order bipolynomial fourier expansion summed over the square root of the algorythm for determining horsepower where torque and speed are multiplied to produce grin and tire smoke.
clint, I didn't know you used to work for garrett. I work for honeywell aero, and I've heard that we get a tremendous discount on their turbos. you should've taken advantage.
and the dual compressor setup looks like that in the 85 series APU... designed in the '50s.
and the dual compressor setup looks like that in the 85 series APU... designed in the '50s.
clint, I didn't know you used to work for garrett. I work for honeywell aero, and I've heard that we get a tremendous discount on their turbos. you should've taken advantage.
and the dual compressor setup looks like that in the 85 series APU... designed in the '50s.
and the dual compressor setup looks like that in the 85 series APU... designed in the '50s.
As soon as I get it back on the road, you're more than welcome to
Thread Starter
Joined: May 2007
Posts: 1,806
Likes: 46
From: Vancouver BC, Canada
Flashed engine with a new tune, idles nice at 675 rpm. Started the engine for about 10seconds to lube the turbo but not long enough for things to really warm up. Blocked off the turbo oil feed line and restarted engine... with the oil still cool and no supply to the turbo it was getting 15psi dropping down to 10psi. ****. Guess oilpan has to come off and investigate the pickup o-ring. Come to think of it I believe I put the brand new o-ring on the pickup tube first, but either way pan's gotta come off.. arg!!!
Thread Starter
Joined: May 2007
Posts: 1,806
Likes: 46
From: Vancouver BC, Canada
Going to throw a mechanical gauge on there and start it tonight to confirm shitty oil pressure, and if so, it's gonna be a pull-oil-pan-and-check-oring-but-also-probably-replace-oil-pump drinking party tomorrow... craaaaap.
When you get close to it, pull the allen plug on the oil pump.
If some reason the bypass plug is stuck, you could be by-passing the oil.
Hope you find a smoking gun though...sucks when you pull apart a motor, make an oily mess only to find nothing wrong...
If some reason the bypass plug is stuck, you could be by-passing the oil.
Hope you find a smoking gun though...sucks when you pull apart a motor, make an oily mess only to find nothing wrong...