Hi Jim,
Daniels right. There is a substantial drop in oil pressure,--- to the engine!
The reading you see on the oil pressure guage is before the restrictive 3/8"
hose,
not where it's being fed to the crankshaft and journals!!!!
Put in a 1/2" hose and the reading on the guage would likely remain the same,
but
there is a great deal more oil arriving at the crankshaft. Do the math and you
see that the 1/2" hose has almost 2 times the oil carrying capacity of the 3/8"
hose. That small hose puts new meaning to "we tight"!!!!
Doesn't sound like a smart move to me.
r squared X pie = surface area. (If I remember my math right!)
3/8" hose = .11044 square inch
1/2" hose = .19635 square inch
There is no mention of the inside diameter of the fittings used. They might be
as
small as 1/4".
Does this sound like oil starvation?
"But the oil pressure was so good when it spun the bearings and I wasn't even
going fast!!!!!"
Paul A
JARplanner@aol.com wrote:
> A friend in town recently installed a oil cooler into his Bugeye (stock 948)
> to help reduce engine & radiator temperature during summer (this is So
> Calif). Rather than buying a standard oil cooler kit he made up his own (we
> tight!) His home-made set-up resulted in a 20 degree reduction in water temp &
> oil pressure is still in 50-60 psi range. Before building a similar setup
> from myself I am interested in getting opinions & facts from List. The whole
> setup was so easy, and he spent all of $35 ($28 for transmission cooler, rest
> for length of hose & clips). I do have concern about long-term quality.
>
> He simply cut the copper tube running from oil filter adapter to the engine
> block, and connected a 3/8" rubber hose to each end using regular hose clips
> and then to a transmission cooler (from cheap auto parts store). No fancy
> adapters or steel braided hose.
>
> Daniel Stapleton's book (page 20) says that a hose of 3/8" rather than 1/2"
> will result in substantial drop in pressure, but it did not occur here. I
> would have thought that oil pressure would go down with a larger diameter
> hose rather than a smaller, but then I do not admit to being an hydraulics
> expert. Can anyone explain? Could retaining the original block & oil filter
> connections help keep the pressure up? Any danger in hose or clips bursting
> under pressure? - I would think not.
>
> Would be interested in any thoughts or experience.
>
> Thanks,
> Jim Rogers
> San Juan Capistrano, CA (106 degrees yesterday!)
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