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Date: Sun, 07 Oct 2012 18:15:44 -0400
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From: "David M. Powell CRFA" <superdmp@sonic.net>
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Subject: RE: [LML] Piston oil cooling jets
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Before I purchased my 360, I went for a demonstration flight with another
360 owner.  He had been having high engine temperatures and installed a
small vent extension below the engine compartment.  It increased the airflow
around the engine and he said solved his heat problem.  My 360 seems not to
have a heat problem so I haven't bothered with It myself; but he seemed
pretty pleased with his results. 

Good luck to you,
Dave 


David Powell CRFA
superdmp@sonic.net
(386) 868-5858
 

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
N20087
Sent: Sunday, October 07, 2012 12:34 PM
To: lml@lancaironline.net
Subject: [LML] Piston oil cooling jets

> Folks

This is addressed to the hard core engine experts on the forum.  I would
love your feedback on this 

I am considering having my io360 crankcase modified so that I can install
piston cooling jets which are standard in 200hp engines.  The reason being,
I have had to take aircraft out of service twice, once at 80 hrs and now at
160 due to lousy break-in and high CHTs. I have done all the obvious stuff
such as plenum, timing, plugs, flowed the fuel servo to the rich side,
baffles etc.. I am running 9:1 eci cerminil cylinders and they will hit 430
on climb out.  They went to 450 twice in the initial break-in. They will run
370 in 75% cruise and 340 lop

All this aside, the pistons at 80 hrs (both times) were coated in dark
varnish under the crown and the top of the crowns were heavily carbonized
from oil blowback

I am just getting tired of it and don't want to pul the engine apart again
anytime soon after this downturn

So,,,I am wondering if anybody has any experience or data concerning the
cooling benefits of the piston oil nozzles.  Ie is it 5 degrees or 20+

Also, I am debating whether to split the crankcase myself or take the closed
case (jugs and every accessory removed) with con rods still attached to the
local shop and have them split the case, do the machining and reassemble.
The shop is very very reputable but of course the cost will be higher if I
get them to do the breakdown and reassembly 

As another cooling remediation measure I was thinking of opening up the cowl
inlets to 4 inches but a little reluctant due to the increased drag and
limited benefit.  I added an electric cowl flap by the way and achieved only
a 2 degree CHT improvement in climb at 130 knots Go figure!

Again, any feedback on my plan here would appreciated 

Thanks in advance 

Tom 


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