Oil filter for oil injection line?

[gyrobob]

What kind of filter should be used prior to the oil injection pump on
a 503?

Right now I am using one of those glass-body filters with the
replaceable plastic screen element, originally intended for gas. The
gravity flow rate of AV-2 through the whole 3/8" oil line (including
the filter) into a test bucket is rather slow, but still a lot faster
than the motor can use it -- about a gallon of oil per hour.

Aren't there some metal screen inline filters available somewhere?

Thanks,

Bob

[red]

Bob,
Autozone, outboard motor shops, speed shops, or motorcycle shops should
have what you want. Generally, the plastic meshes are for gasoline, and
the metal meshes are for alcohol fuels. Some glass inline filters can use
either element.
If you use an oil injection system, the glass cased filter lets you see if
any water has condensed in the oil tank, as part of preflight. I ruined a
motorcycle engine on the freeway once, due to that problem. It seems to me
that the filter should be vertical, with the inlet at the bottom, to
prevent water from getting into the oil injection system. On the bike, I
also installed clear oil lines, so I'd also know if there were any air
bubbles in my oil lines. Some clear tubing handles oil well, and some does
not. Make sure that the tubing manufacturer agrees that oil is no problem
for their tubing, if you are going to replace your oil lines.
Just a thought.
--
Cheers,
Red
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[gyrobob]

That's a good idea about the water trap.

I use Tygon clear line. www.tygon.com and www.usplastic.com It is
yellow, and the only one I know of that does not get brittle with age,
even with oil, gas or gasohol.

Maybe I should try a speed shop and ask for a fuel filter for alcohol,
eh?

Thanks,

Bob

red <re...@xmission.com> wrote in message news:<3ED024E4...@xmission.com>...

[Mark Smith]

I use/sell a small plastic filter, specifcally intended for oil,

the fuel filters need to be very small holed, ie, pick out little bity
stuff, some of which may still clog the really small ports in the carb,

the oil filter on the other hand , only has to remove big stuff, but
surely have a good flow rate due to the need for gravity feed, and the
poor sucking ability of the rotax/mikuni oil pump,

BTW, the glass filter with the screw on ends has created lots of
problems several years ago, I suggest folks do not use them,

--

Mark Smith
Tri-State Kite Sales http://www.trikite.com
1121 N Locust St
Mt Vernon, IN 47620 mailto:ma...@trikite.com
1-812-838-6351

[gyrobob]

What kinds of problems did the glass-body filters have?

I remember a while back seeing one of those with a brass screen filter
that would have been better for oil than the very fine plastic mesh
that is in there now.

I was worried about the flow rate of that filter so I measured it.
With gravity as the only "force," it drains the 2qt oil tank in a
little less than an hour, for a flow rate of about .5 gal per hour.
It seems that all the engine would need is about .1 gal per hour.

Does your oil filter have 5/16" barbs on it, or is it for 1/4" line?

Thanks for the info.

Mark Smith <ma...@trikite.com> wrote in message news:<3ED0B5...@trikite.com>...

[Mark Smith]

I always get filters with 1/4 inch barbs as that is pretty much the
standard for our industry,

also, the glass filters had a nut inside that backed off, and doing so
negated the 'filter' part of the filter,

I have also seen them leak due to unscrewing,

and they are heavier, cheap shot for sure !