[rebel-builders] CHTs
Posted: Sun Feb 19, 2012 10:53 am
Hi Clay !
Gee, those don't sound that high - I've run hotter than that
on long climbs..... typically, I used to see 430, and the oil
would sometimes get to 220 - on days when the oat was +30 or so.
You sure want to be running straight 100 weight oil though...
I dropped the rear of the cowl down a couple of inches to
let more air out - solved the problem. Do NOT cut forward -
it makes it worse !!! The air will swirl UP into the bottom
and slow down the cooling. You could try just making the lip
bigger - add a couple of inches onto it & see if it helps ...
I actually have a moveable section at the bottom rear of
the cowl that I can open & close to 3 positions, just by undoing
2 bolts & repositioning - works great. If I were doing it
again, I'd make the moveable section wider ...
If you are using the 'under spark plug' type CHT probes,
and they are on the bottom plugs, they read about 40 degrees
hotter than the top plugs, so you may be just fine !
Sounds like you're having fun !!! :-) Enjoy it !!!
--
......bobp
http://bpatterson.qhealthbeauty.com
-------------------------------orig.-------------------------
On Saturday 10 June 2006 11:52 pm, Clay Smith wrote:
metal cowl. They run around 390 and as high as 420 on # 2 which is the front
pilot side. Oil temp is good around 185. My guess would be that the bottom
exit open is not big enough. So, my question is which is the best way to
correct this? I could cut back (actually cut forward) the bottom cowl metal
to make a bigger opening (I do have a lip on the bottom trailing edge
already) or, maybe I could place some kind of grill openings further forward?
I'm sure some of you have already gone through this and may have some advice.
I did block off the oil cooler scat hose input on the rear baffle some to
increase the oil temp and this did seem to lower the # 2 a little, but not
enough.
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Gee, those don't sound that high - I've run hotter than that
on long climbs..... typically, I used to see 430, and the oil
would sometimes get to 220 - on days when the oat was +30 or so.
You sure want to be running straight 100 weight oil though...
I dropped the rear of the cowl down a couple of inches to
let more air out - solved the problem. Do NOT cut forward -
it makes it worse !!! The air will swirl UP into the bottom
and slow down the cooling. You could try just making the lip
bigger - add a couple of inches onto it & see if it helps ...
I actually have a moveable section at the bottom rear of
the cowl that I can open & close to 3 positions, just by undoing
2 bolts & repositioning - works great. If I were doing it
again, I'd make the moveable section wider ...
If you are using the 'under spark plug' type CHT probes,
and they are on the bottom plugs, they read about 40 degrees
hotter than the top plugs, so you may be just fine !
Sounds like you're having fun !!! :-) Enjoy it !!!
--
......bobp
http://bpatterson.qhealthbeauty.com
-------------------------------orig.-------------------------
On Saturday 10 June 2006 11:52 pm, Clay Smith wrote:
power settings (above 2500 rpm) even after 5 hrs on a rebuilt 0320 with aHi Guys,
I have some concerns about my CHTs still being a little too high on high
metal cowl. They run around 390 and as high as 420 on # 2 which is the front
pilot side. Oil temp is good around 185. My guess would be that the bottom
exit open is not big enough. So, my question is which is the best way to
correct this? I could cut back (actually cut forward) the bottom cowl metal
to make a bigger opening (I do have a lip on the bottom trailing edge
already) or, maybe I could place some kind of grill openings further forward?
I'm sure some of you have already gone through this and may have some advice.
I did block off the oil cooler scat hose input on the rear baffle some to
increase the oil temp and this did seem to lower the # 2 a little, but not
enough.
Thanks for any help.
Clay
C-GZZO
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