[Supras] Stock oil pump

[Jeff Mohler]

"after all I had read about starvation on acceleration"
---

You -never- read this concerning a Supra Bernie, you just threw money
at a boogey-man from a 40yr old Detroit dinosaur.


NOTHING is an upgrade without an understanding of what rational
failure it will prevent.  Anything else is a sexy way to burn money
and feel cool.








On Tue, Apr 8, 2008 at 5:02 PM, berniek at technicaldevelop.com
<berniek at technicaldevelop.com> wrote:
> The stock pump in my JDM core was like new.  I had previously bought one
>  used, and found the angular slop in the gears from wear to be
>  excessive.  The stock pump worked fine.  Judging from the cylinder wall
>  condition, the JDM probably had 40K to 60K easy miles (it was from an
>  automatic)
>
>
>  I started with about 1/8" of shimming in both the pump relief and bypass
>  relief valves, filled the crankcase with 10W oil with the engine
>  assembled on the stand with the spark plugs out and just a few pan
>  screws in.  Turned it over at the damper bolt with a heavy 1/2" drill
>  and found the oil pressure to be 80-100 PSI, so removed most of the
>  shimming.  In the '91T, it is fine, although the new sender reads 20 PSI
>  low.  I suspect that many of them do this because I had exactly the same
>  situation in the '90 which I sold at 156K miles.  I checked the pressure
>  by punching a hole (no chips) in the bottom of a new oil filter,
>  soldering in a piece of 1/4" copper tubing, and connecting to an
>  accurate gauge.  When hot, there is very little pressure drop across the
>  element at idle, and the real gauge reads about 18-20 PSI.  The dash
>  gauge reads almost zero even with the new sender.
>
>
>  Also, I moved the pickup back to the rear kickup in the pan, after all I
>  had read about starvation on acceleration, running a quart high, etc.
>  Have photos of how to do it if anyone is interested.
>
>
>  BernieK
>
>  _______________________________________________
>  Supras mailing list
>  Supras at supras.com
>  http://supras.com/mailman/listinfo/supras_supras.com
>