Today's Message Index:
----------------------
1. 05:26 PM - CHT - Water Temps - Plug Colors (Andrew SanClemente)
2. 06:21 PM - Re: CHT - Water Temps - Plug Colors (Larry McFarland)
Message 1
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| Subject: | CHT - Water Temps - Plug Colors |
--> Stratus-List message posted by: Andrew SanClemente <ansancle@townisp.com>
Having gotten to about 5 hours on my engine I have some questions and
observations regarding a few things. My water temps are a consistent
165-170, never higher.
My CHT climbs rapidly to 210-250 depending upon if Im moving or not,
a fast taxi drops it down to 210-220.
I just sent for a new oil temp sender as the vdo that came with the
engine doesn't work for my gauge (mitchell).
Should the CHT climb that rapidly? Does that water temp sound correct
given the much higher CHT? I have seen in the archives where people
have stated the CHT is a useless gauge, Im interested in comments.
My water looks great but that CHT gauge has me nervous given its
proximity to that 260 overheat mark stated by stratus. Since I don't
have an oil temp yet I can't feed that data into this.
I pulled my plugs and found that each is burning different. 4 is very
sooty and black, 2 is a nice light to medium brown, 3 is black but
not as sooty as four, and 1 is a darker brown that 2 but not bad.
This seems strange to me as I would expect differences between carbs,
but between cylinders? Again comments welcome,
Thanks as usual
- Andy
Message 2
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| Subject: | Re: CHT - Water Temps - Plug Colors |
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
Andrew,
The cooling issues for the stratus begin with water temps
as I believe the thermostat opens at or near 180-deg F.
If you have CHTs that exceed limits quickly, there
are two things you should consider. Do you have the correct
CHT thermocouples? "Block thermocouples" read about 60-degrees
cooler than "spark plug thermocouples". If it's not this, you should
really have an EGT that confirms your mixture's correct and delivering
between 1200 and 1400 degrees at higher rpms. Warm the engine
first to get oil to 120 and coolant to 180 before raising the rpms
above 2000. Confirm that you've got water circulation by checking your
hoses.
Then, raise the rpms to 3500-4000 to see what your CHTs are.
230 is CHT max. If they're above the 225 level, check your EGT
at that point. If EGTs are close to 1300, look to your thermostat. If
they're near 1400, look to your mixture and rejetting Bings.
The Stratus provides #164 jets and the circlip is generally on the #2
notch. My circlip had to be lowered to the #3 notch and I'm using
#170 jets. If you don't have an EGT, check that the timing is set
to 31-degrees before top dead center at 4000 rpm. (best done withou
the prop on) If you're ok there, you should consider the EGT and CHT.
Plugs will soot up at idle and not be readable just by looking at them.
After wiping the soot off, check the base color. What you describe
as light brown under the soot is probably in range. If any plug is
white-tan, look further at enriching mixture.
As usual, I've said too much, but it sounds a lot like what early on, I went
through in sorting out my Stratus. It's a good engine that needs tweeking
at the carbs and radiator for the individual installation.
Hope this helps,
Larry McFarland
Do not archive
----- Original Message -----
From: "Andrew SanClemente" <ansancle@townisp.com>
Subject: Stratus-List: CHT - Water Temps - Plug Colors
> --> Stratus-List message posted by: Andrew SanClemente
> <ansancle@townisp.com>
>
> Having gotten to about 5 hours on my engine I have some questions and
> observations regarding a few things. My water temps are a consistent
> 165-170, never higher.
> My CHT climbs rapidly to 210-250 depending upon if Im moving or not,
> a fast taxi drops it down to 210-220.
> I just sent for a new oil temp sender as the vdo that came with the
> engine doesn't work for my gauge (mitchell).
> Should the CHT climb that rapidly? Does that water temp sound correct
> given the much higher CHT? I have seen in the archives where people
> have stated the CHT is a useless gauge, Im interested in comments.
> My water looks great but that CHT gauge has me nervous given its
> proximity to that 260 overheat mark stated by stratus. Since I don't
> have an oil temp yet I can't feed that data into this.
>
> I pulled my plugs and found that each is burning different. 4 is very
> sooty and black, 2 is a nice light to medium brown, 3 is black but
> not as sooty as four, and 1 is a darker brown that 2 but not bad.
> This seems strange to me as I would expect differences between carbs,
> but between cylinders? Again comments welcome,
>
> Thanks as usual
> - Andy
>
>
>
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