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From: N20087 <n20087@yahoo.com>
Subject: Piston oil cooling jets

> Folks

This is addressed to the hard core engine experts on the forum.  I would lov=
e your feedback on this=20

I am considering having my io360 crankcase modified so that I can install pi=
ston cooling jets which are standard in 200hp engines.  The reason being, I h=
ave 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 e=
tc.. I am running 9:1 eci cerminil cylinders and they will hit 430 on climb o=
ut.  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 varni=
sh under the crown and the top of the crowns were heavily carbonized from oi=
l blowback

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

So,,,I am wondering if anybody has any experience or data concerning the coo=
ling 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.  T=
he shop is very very reputable but of course the cost will be higher if I ge=
t them to do the breakdown and reassembly=20

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 lim=
ited 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=20

Thanks in advance=20

Tom=20