Do I have a possible problem?

[Guitarmaster]

#4 CHT seems a bit low.

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GAMI spread is .1

[rbridges]

I wouldn't think so.  My alarm (set by previous owner) doesn't go off unless I have a 40 degree difference.  It is odd though.  My # 1 and 4 cylinders are typically the hottest.  

[ArtVandelay]

I hope not because I have 2 cylinders with same problem:

BTW, our MAP,RPM numbers are almost identical, you are getting more HP, OAT difference of 10 degrees and I'm 60 LOP.

[Pritch]

Does your #4 cylinder have the stock probe, if so then the JPI probe different than the rest and could account for the lower reading.

Pritch

[Guitarmaster]

Does your #4 cylinder have the stock probe, if so then the JPI probe different than the rest and could account for the lower reading.
Pritch

No. All new JPI probes.

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[bradp]

I noticed my number 2 (IO-360 l) was running a bit cool... on Gami spread it now peaks first and goes deep LOP when the other guys are sitting in range.  In flight LOP mag test was unremarkable.    In all likelihood  I'm on to chasing an induction leak or FF discrepancy for number 2.  I'll let you all know how it goes.  

[Guitarmaster]

I just did the induction leak test. #3 Delta was higher by 50 than the rest. Either I have a leak in number three or all the others.
I sent it to savvy to what they think.

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[Marauder]

That's fine Matt.




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[RobertE]

19 hours ago, Guitarmaster said:

 

No. All new JPI probes.

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You know, I have 4 EGT probes driving my engine analyzer too (mine happens to be an EI analyzer, not JPI) but the one on the #4 cylinder is connected to the stock probe that feeds the EGT on the panel.  As a result it produces a diminished temperature reading than the others.  Perhaps your setup is different but in mine there is simply no way to connect the #4 EI probe without making use of the stock probe.

 

 

[Guitarmaster]

You know, I have 4 EGT probes driving my engine analyzer too (mine happens to be an EI analyzer, not JPI) but the one on the #4 cylinder is connected to the stock probe that feeds the EGT on the panel.  As a result it produces a diminished temperature reading than the others.  Perhaps your setup is different but in mine there is simply no way to connect the #4 EI probe without making use of the stock probe.
 
 

Nope. All the probes and wiring are new. The JPI fit right into the stock hole.

It was the low CHT number was questioning though.


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[Pritch]

Have you tried switching the probes to see if you get the same reading?

Pritch

 

[Guitarmaster]

Actually, no.  However, Savvy came back with a possible #4 plug problem.  Investigation to come.....

 

[carusoam]

The Savvy folks have some really good skills!

Best regards,

-a-

[Marauder]

#4 CHT seems a bit low.

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GAMI spread is .1

Matt -- not sure if it is an orientation thing or a firmware difference, but I have graduations on my fuel quantity level. Yours doesn't.


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[carusoam]

I remember the firmware update to get the lines.  Probably can search that out around here...

Best regards,

-a-

[mccdeuce]

So curious based on this - I will have to try to download my EDM700 data to find more. 

I am seeing much higher CHTs with similar RPM/MP/OAT.  on intitial ferry flight was seeing 385 and on my flight yesterday to Florida I saw closer to 400. I know that the probe is screwed up for cylinder 1 and I usually monitored only the hottest somdomt know the spread. 

The engine is the A3B6 conversion with split mags. I am not sure if they are 25 or 20 timed.  My plan was to put on a electroair emag but even more unsure because of the high cht's.  

Probably going to inspect my baffling tonight or tomorrow as well as do a GAMI test. (Maybe injectors in wrong spots after engine swap)

[mooniac15u]

1 hour ago, mccdeuce said:

So curious based on this - I will have to try to download my EDM700 data to find more. 

I am seeing much higher CHTs with similar RPM/MP/OAT.  on intitial ferry flight was seeing 385 and on my flight yesterday to Florida I saw closer to 400. I know that the probe is screwed up for cylinder 1 and I usually monitored only the hottest somdomt know the spread. 

The engine is the A3B6 conversion with split mags. I am not sure if they are 25 or 20 timed.  My plan was to put on a electroair emag but even more unsure because of the high cht's.  

Probably going to inspect my baffling tonight or tomorrow as well as do a GAMI test. (Maybe injectors in wrong spots after engine swap)

Is your high CHT limited to one or two cylinders?  If so, which ones?

[mccdeuce]

No I have CHT on all 4 but something is wrong with #1. It fluctuates all over the place.

[mooniac15u]

9 minutes ago, mccdeuce said:

No I have CHT on all 4 but something is wrong with #1. It fluctuates all over the place.

Was the HIGH CHT on just one or two cylinders or on all four?

[Guest]

3 hours ago, mccdeuce said:

No I have CHT on all 4 but something is wrong with #1. It fluctuates all over the place.

CHT can not normally change rapidly, I'd suggest a loose wire or faulty probe.

Clarence

[mccdeuce]

7 hours ago, mooniac15u said:

Was the HIGH CHT on just one or two cylinders or on all four?

Ha. Totally misread your question... I will have to look again. Going to try and run a GAMI spread check on Friday as well. Should have better understanding. 

3 hours ago, M20Doc said:

CHT can not normally change rapidly, I'd suggest a loose wire or faulty probe.

Clarence

Agreed. I suspect a faulty probe but am contemplating upgrading to the 730 or 830 so will fix when I do that.