A guy I know had a set of lines made at a hydraulic shop for his race
4A-G. It wasn't quite Atlantic spec but still on the order of 220 hp and
8500+ RPM. He had issues with bearings until he showed us the oil lines
- the IDs of the adapters were maybe 5/16" and while the hose OD was
similar to what you'd see on -10 Earl's line, the ID was no more than
3/8".
On the Ford small block, the pressure relief is built into the oil pump
so if there is any downstream obstruction, it will dump extra oil
overboard and the downstream pressure is reduced. However, I don't know
offhand whether the gallery that the gauge gets its feed from is after
the filter, or before.
I have never seem over about 55 psi on my gauge, on either engine I've
had in the car. I have the filter in the left fender with a pair of -10
hoses, two 90 degree hose ends, and two straight ends. The block adapter
is a ultra-low-profile homebuilt device, but internally it's got similar
passage sizes to the Canton adapter and the one sold by Dale. For the
kinds of RPM I can run, 55 psi is more than enough, but if I was going
to build a high RPM engine I will be looking into that a little bit. I'd
start with putting the oil pressure gauge on my air compressor line to
see if it was OK, though.
Cheers,
Theo
> -----Original Message-----
> From: Dave Munroe [mailto:dave@munroe.ca]
> Sent: January 11, 2010 8:58 AM
> To: Smit, Theo; tigers@autox.team.net
> Subject: Re: [Tigers] Tigers Digest, Vol 4, Issue 11
>
> Theo;
>
> This is a concept I have not considered: are you saying that
> smaller internal diameter oil filter lines will cause a drop
> in oil pressure to the filter? or to the engine oiling system
> which could be seen on the oil pressure gauge?
>
> I have a set of "industrial" oil line hoses on my filter
> set-up, and am not happy with my oil pressure as seen on my
> dash mounted gauge. I haven't checked the internal dia. of
> the hoses so I don't know if they are indeed smaller than
> they need to be, but it would be interesting if they are a
> factor in my overall oil pressure.
>
> Thanks for this bit of info.
>
> Dave
>
>
>
>
> If you do get oil lines made at a hydraulic shop, make sure
> they understand that this is for a continuous-flow oiling
> system, not for a hydraulic application. Hydraulic hose and
> fittings have smaller IDs than oil hose, for the same hose
> OD and fitting thread sizes, and you'll get much greater
> pressure loss in the lines.
>
> Cheers,
> Theo
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