Larry,
Since this went out to the net I'm going to respond so people will understand what's going on. Yes, please bring the radiator and
fuel pumps to Shawnee.
The reason I want the oil coolers from Johnny's aluminum radiator is to measure the pressure drop through the engine oil cooler and
compare it to the OEM cooler.
More information for curious minds.
Awhile back I made a presentation at a GMCMI Convention showing that as long as you install the correct oil filter in a 455 /403 (no
built in bypass) and it is functioning properly there is no way that oil flowing out of the engine to the engine oil cooler in the
radiator can get back into a 455 or 403 Oldsmobile without passing through the oil filter. Oil leaving the engine can bypass the
engine oil cooler in the radiator and filter by going through the bypass in the oil filter adapter that bolts directly to the side
of the engine. I was asked "then why do quality rebuilt engines fail after low mileage?" My response was that the bypass in the
engine oil filter adapter in a 455/403 in a GMC opens at 5.3 to 6.3 psi which is the same as a Toronado installation. The Toronado
never had a radiator engine oil cooler (it did have a transmission fluid cooler). The pressure drop in a GMC through the hoses to
the oil cooler, oil cooler, and return is higher than in a Toronado and it is possible that the bypass is open more and for longer
periods of time in the GMC. Add the fact that these vehicles are over 30 years old and there has to be an accumulation of crud in
the oil cooler which would increase the pressure drop. Then add the pressure drop caused by the crud from a blown engine into the
equation and you may have a situation where the bypass in the oil filter adapter is great enough to keep the bypass open even more.
Newly rebuilt engines generate a lot of contaminants while they are run in. If the bypass stays open those contaminants are fed
right back into the engine. I purchased a differential pressure gage and flow meter to run tests on a newly rebuilt engine at Tom
Pryor's last summer, unfortunately that didn't happen for various reasons. I shipped the test gear to Manny's with a view to do the
testing there unfortunately the same thing happened and the testing wasn't done but for different reasons. I WILL figger out a way
to do the testing!
For additional information see;
http://www.gmcmhphotos.com/photos/g6398-455-2f-403-engine-oil-flow-path.html
and:
http://www.gmcmhphotos.com/photos/g6805-oem-engine-26amp-3b-trans-oil-coolers.html
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
Rob, You have mine....remember? Don't need to buy another. I'm bringing it to Shawnee....or am I?