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Discussion in 'FJ25 Owners Group' started by Archie 1962 FJ25, Aug 29, 2006.
In a F motor:-
What is a forced feed oil system?
what is a full flow oil system?
Full flow typically means coming straight out of the oil pump at full pressure. This is usually what goes to the engine itself.
I would assume that the forced feed is the lower pressure feed to the oil filter. From what I see, the oil filter is a by-pass system which takes only a portion of the oil at a time (by lowering the pressure) versus todays newer engines which take full flow through the oil filter.
Force feed means the oil is being pumped by an old pump. Some old engines did not have a pump and the oil was just splashed around
Full flow means all the oil goes thru the oil filter first than to the engine. The 1974 F engine is the only F engine to be full flow. All F engines before that the oil lines split out of the pump part going to the filter than back to the oil pan and the other part flowing thru the engine. The 74 F engines has more in common with the 2F than it does with the earlier F engines.
And .................. if I recall, if the pressure rises the regulator dumps any excess flow right back into the pan.......so the early F is really partial-part flow filtration.
Excellent article on the early filtration systems in Vintage Truck last month............basically in a collector vehicle with little to no use the filter in a partial flow system doesn't do much, if anything at all, with a yearly oil change.
Somebody is shopping for an engine!
Yep somebody wants that real bad, but taking baby steps towards the mission.
So which one is better system? Is it a good idea to go for a 1974 F motor?
i would say yes to a 1974 motor it is as solid as the older 155's and has the oil system of a 2f ...awsome engine...mine has 433,000 miles on it never been rebuilt
X2 on the 74 F engine. That's only if you don't have the original engine to work with.
Here in New Zealand, its dificult to buy motor by year. so how you indentify the 1974 motor by looking at it. I have seen some F motor that have the oil filter mounted remotely on the side of the manifold and on some oil filter mounted on the side of the block.
which one would be 1974 F motor?
The late F engine will have an engine number that starts "F" and has the oil filter mounted on the lower right side like a 2F...