Running warm after top end job

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Fabian9748
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Running warm after top end job

Post by Fabian9748 »

just had the top end of my h2ad redone with a valve job, honing and new rings. only have about 4 hours on the motor so far. my cruising temp is about 180 but when i pick up the speed i can get the motor to about 185-190. thats when ill shut it down to cool for a little. wonderingif ill see lower temps once i get the rings broke in. also fyi i have steel cylinders and chrome rings. thanks guys :salute:

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akblackdawg
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Re: Running warm after top end job

Post by akblackdawg »

185-190 doesn't sound hot to me, but maybe AC motors need to run cooler. I'm a car motor guy. Just replaced my thermistat because mine was a 192* stat, and it was running over 200*. Actually that isn't too hot for typical car, etc, should not be too hot for a airboat I would think. Bud
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Fabian9748
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Re: Running warm after top end job

Post by Fabian9748 »

well im ok with it getting to 185 ish but i was to told by my mechanic tosut it down and let it cool off if it gets to 190. i dont know if it will get any hotter than 190 cause i always shut it down

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JAMES
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Re: Running warm after top end job

Post by JAMES »

Fabian9748 wrote:just had the top end of my h2ad redone with a valve job, honing and new rings. only have about 4 hours on the motor so far. my cruising temp is about 180 but when i pick up the speed i can get the motor to about 185-190. thats when ill shut it down to cool for a little. wonderingif ill see lower temps once i get the rings broke in. also fyi i have steel cylinders and chrome rings. thanks guys :salute:
CHT TEMP OR OIL
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Fabian9748
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Re: Running warm after top end job

Post by Fabian9748 »

Oil temp

CAPTAIN-D
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Re: Running warm after top end job

Post by CAPTAIN-D »

Does you engine have a shroud?

Fabian9748
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Re: Running warm after top end job

Post by Fabian9748 »

no no shroud but i dont think ive ever seen a shroud for a 4 cyl. any one have pics

twister69z
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Re: Running warm after top end job

Post by twister69z »

http://www.generalaviationnews.com/2011 ... mperature/
I see nothing wrong with your temperatures.
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If you don't have time to do it right the first time ,
Where are you going to get the time to do it a second time?

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swampsquatch09
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Re: Running warm after top end job

Post by swampsquatch09 »

Im no expert but when I did my top end job my CHT's seemed to get hotter sooner than normal but after my 15 hour break in with mineral oil the duration is back to normal, my guess is more friction with the rings and hone breaking in, thats just a scientific wild a** guess. iv got a large cooler so I never see anything over 160 on oil temp. I was also told by my local AP mech to keep it between 1800-2300 rpms breaking taking it easy on long steady cruises. everyone take is different
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getitdone
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Re: Running warm after top end job

Post by getitdone »

I have a 540 with the shroud and my oil temp runs 175-185 ish. And my cht runs around 325-375 ish depending how i run it. And runs a little cooler in the winter...
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Re: Running warm after top end job

Post by GMAC 76 »

twister69z wrote:http://www.generalaviationnews.com/2011 ... mperature/
I see nothing wrong with your temperatures.
Twister69z
X2...those temps you listed are normal operating oil temps for Lycoming engines.....plus that little extra heat may help seat them rings

Fabian9748
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Re: Running warm after top end job

Post by Fabian9748 »

Ok then I won't be worried. Just was curious because I was told if you get the lol above 190 the rings can loose tension and never seat. Is this true

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Re: Running warm after top end job

Post by GMAC 76 »

Fabian9748 wrote:Ok then I won't be worried. Just was curious because I was told if you get the lol above 190 the rings can loose tension and never seat. Is this true
Desired Lycoming run in limits for oil temp are 190-210 ...the heat within in these limits in fact is what expands the rings and helps them seat in to the cyls

aircraftman01
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Re: Running warm after top end job

Post by aircraftman01 »

oil red line is 245 f anything under is ok for continuous operation and you want to be at least 180 f to burn off moisture.
You need to worry about cylinder head temp more for break in red line is 500 degrees f max.
Just because oil temp is within limits doesn't mean cylinder head temps are. Really need cht gauge if you run hard.

Thunder200
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Re: Running warm after top end job

Post by Thunder200 »

Get that boat up on some dry ground and run the piss out of it. All your problems will be solved. Plus most of the H2AD motors run hot anyways.

Fabian9748
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Re: Running warm after top end job

Post by Fabian9748 »

i did exactly that climbed the dike on okeechobee a few times, later that day i noticed a bit oower temps than i was used to seeing

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Re: Running warm after top end job

Post by Thunder200 »

There ya go! Just takes a little time and some good heat to get the rings seated. you should be burning some oil right now to. I wanna say its 25 hours with the mineral oil and then change your oil to the regular Aeroshell 100. keep giving her hell every once in a while when you go out and by 40 to 50 hours your temps and rings should be right.

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