Oil pump input nipple

by Pete Christensen in General Tech Discussion 8 years ago

I'm replacing the oil line between the oil pump input and the oil cooler in my 1991 Kitfox 912. The oil pump input has a 3/8" barb and the oil cooler has a 1/2 " barb. The line I took off was 1/2" hose. The previous owner used a hose clamp to compress the hose to fit. I'm not comfortable redoing that technique. I was thinking of using a 3/8" to 1/2" hose barb adapter with a short piece of 3/8" hose since this engine has 1,100+ hours running just fine with this setup. Any comments yea or nay?

Pete Christensen

Re: Oil pump input nipple

by Roger Lee » 8 years ago

Roger Lee

131 5.38k 5.44k

Hi Pete,

The oil will be slowed at the smallest orifice (the 3/8" fitting). Replace it with a 1/2" and then use your 1/2" hose.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Report
Re: Oil pump input nipple

by Pete Christensen » 8 years ago

Pete Christensen

5 10 0

Just located one. Thanks roger.

Pete

Report
Re: Oil pump input nipple

by Peter Kl. » 8 years ago

Peter Kl.

7 230 382

Replacing the tiny bit is the thing to do.
But I cannot resist to ad that Bernoulli and Venturi suggest that the oil actually speeds up at the bottleneck.
I found a very similar installation on a fuel line where brute force was supposed to squeeze the connections tight. However, it did not work, surprise.
If I may ask, did you have any obvious fluctuation on your oil pressure or was it all normal?

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
Oil tank flare nut torque value	General Tech Discussion	2
Oil tank flare nut torque value	General Tech Discussion	1
What thread is that on my new oil cooler?	912 / 914 Technical Questions	1
Oil Analysis specific for rotax suggestions	General Tech Discussion	7
Would larger oil hose size increase cooling?	General Tech Discussion	4