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BobbyPaulk(at)comcast.net
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PostPosted: Sat Jul 25, 2015 11:47 am    Post subject: CHT Reply with quote

List,

My CHT for #4 is 301 degrees, #5 is 305 and #6 is 320 ~ 325.

Manifold pressure is 19" and 2400 rpm and 118 mph.
My question: Will 320 constantly at 19" shorten the life of my engine.

Or another way to put it is what is the highest CHT I can run without damage to the engine.

I know 356 degrees is max and cooler is better.

I have 240 hours on this engine and this is about the best I can get. Number one is running at 200 degrees and under.
Probes have been checked and are within 10 to 15 degrees.

Bobby ( age 77 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 240 hrs.

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BobbyPaulk(at)comcast.net
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PostPosted: Wed Jul 29, 2015 6:13 am    Post subject: CHT Reply with quote

Is anyone running CHT's at or near 320 ~325 at cruise.

I can not seem to get 5 & 6 below 320 deg.

Bobby ( age 77 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 241 hrs.

[quote][b]


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jetboy



Joined: 22 Jul 2006
Posts: 233

PostPosted: Thu Aug 06, 2015 6:26 pm    Post subject: Re: CHT Reply with quote

You do seem to have tried everything obvious. a fellow over here is chasing high CHT across all cylinders and hasnt fixed it yet. Frustrating - which you already know. But he did tell me the correct main jet is now supposed to be #280
and needle jet #278 - #280
My engine is 2200 and i had highest CHT on #4 which was helped by adding some deflector strip around the rear corner of the duct there - to fill a leaking gap area around the back of the head

a visual check on overheating is for fins on the heads - they externally warp if overheated and can be seen looking along the bank - if they show all straight at 240 hrs is enough to say 320 CHT is working OK for you although we'd all be happier with 300 or less.
Ralph in NZ CH701 / 2200a


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