Today's Message Index:
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1. 01:18 AM - Re: What Temps should I see? (Gary L Vogt)
2. 11:44 AM - Re: What Temps should I see? (Scott Trejo)
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| Subject: | Re: What Temps should I see? |
Ken,
I'm not all that convinced Tigers run any hotter than any other air cooled a
irplane.
In 2004, I installed a JPI analyzer in a 260 Comanche with a 300 hr engine i
n place of an EI analyzer. The engine had been built by Lycon. I also clea
ned up the baffles and seals.
On the first flight, the owner brought it back shortly after take-off saying
there was something terribly wrong with the engine cooling; his CHTs were o
ver 450 on climbout. I had suspected JPIs indicated higher (more accurate?) f
or several years. Both the owner and I went over the entire baffle installat
ion and verified everything was tighter than before.
In 2007, I upgraded a Tiger to a JPI 700 from an older digital EI analyzer.
I installed the EI in my panel next to my JPI. The EI was installed on #3 an
d the JPI watched the rest. I used a separate circuit breaker for each unit
and used the same engine ground for each. I wrote about it in the AYA Star.
Prior to startup, both analyzers read the same. By the time I got to the ru
nup, the JPI was as much as 100 degrees higher. In climbout, the JPI was as m
uch as 80 degrees higher. Straight and level in cruise, the JPI was 40 to 8
0 degrees higher. I flew both units for over a year.
I wrote to Aviation Consumer to see if they would do some research. They ref
used.
Ken Tunnell at LyCon has had customers complain of CHTs being too high and l
ater discover it was a JPI analyzer.
In general, keep it under 470 on climbout and expect 410 to 440 in full powe
r cruise. If at all possible, run the engine as lean as possible, even expec
ting some slight roughness. If you can get it super lean, the CHTs will come
down. Don't expect a big drop, just 10 degrees or so.
Gary
Sent from my iPad
On Jun 22, 2013, at 11:27 AM, "Patricia Kirkpatrick" <thornytoo1@hughes.net>
wrote:
> Gentlemen (and Ladies too)
>
> I just had a newly overhauled O-360 installed on my tiger, along with a JP
I EDM-900 analyzer. My issue is that I have no reference data to tell how h
ot my engine is running. I am aware that Tigers have a reputation for runni
ng hot, but my old panel only had an EGT gage. Specifically, what CHTs for c
yls 3 & 4 should I expect to see on a newly overhauled ( and thus tight) eng
ine during climb and also during cruise? Also, what temps should I expect t
o see on those same cylinders during climbs and during cruise after the engi
ne is broken in and using detergent oil? I understand climb speeds and ambi
ent temps affect the situation to some extent, but some ballpark figures wou
ld be nice for a reference.
>
> Ken Kirkpatrick
> N28546
>
>
>
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Message 2
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| Subject: | Re: What Temps should I see? |
Ken, a good design should yield 385/390 across all cylinders.
Sent from my iPhone
On Jun 23, 2013, at 3:17 AM, Gary L Vogt <teamgrumman@yahoo.com> wrote:
> Ken,
>
> I'm not all that convinced Tigers run any hotter than any other air cooled
airplane.
>
> In 2004, I installed a JPI analyzer in a 260 Comanche with a 300 hr engine
in place of an EI analyzer. The engine had been built by Lycon. I also cl
eaned up the baffles and seals.
>
> On the first flight, the owner brought it back shortly after take-off sayi
ng there was something terribly wrong with the engine cooling; his CHTs were
over 450 on climbout. I had suspected JPIs indicated higher (more accurate?
) for several years. Both the owner and I went over the entire baffle instal
lation and verified everything was tighter than before.
>
> In 2007, I upgraded a Tiger to a JPI 700 from an older digital EI analyzer
.
>
> I installed the EI in my panel next to my JPI. The EI was installed on #3 a
nd the JPI watched the rest. I used a separate circuit breaker for each uni
t and used the same engine ground for each. I wrote about it in the AYA Star
. Prior to startup, both analyzers read the same. By the time I got to the r
unup, the JPI was as much as 100 degrees higher. In climbout, the JPI was as
much as 80 degrees higher. Straight and level in cruise, the JPI was 40 t
o 80 degrees higher. I flew both units for over a year.
>
> I wrote to Aviation Consumer to see if they would do some research. They r
efused.
>
> Ken Tunnell at LyCon has had customers complain of CHTs being too high and
later discover it was a JPI analyzer.
>
> In general, keep it under 470 on climbout and expect 410 to 440 in full po
wer cruise. If at all possible, run the engine as lean as possible, even exp
ecting some slight roughness. If you can get it super lean, the CHTs will co
me down. Don't expect a big drop, just 10 degrees or so.
>
>
>
> Gary
> Sent from my iPad
>
> On Jun 22, 2013, at 11:27 AM, "Patricia Kirkpatrick" <thornytoo1@hughes.ne
t> wrote:
>
>> Gentlemen (and Ladies too)
>>
>> I just had a newly overhauled O-360 installed on my tiger, along with a J
PI EDM-900 analyzer. My issue is that I have no reference data to tell how h
ot my engine is running. I am aware that Tigers have a reputation for runni
ng hot, but my old panel only had an EGT gage. Specifically, what CHTs for c
yls 3 & 4 should I expect to see on a newly overhauled ( and thus tight) eng
ine during climb and also during cruise? Also, what temps should I expect t
o see on those same cylinders during climbs and during cruise after the engi
ne is broken in and using detergent oil? I understand climb speeds and ambi
ent temps affect the situation to some extent, but some ballpark figures wou
ld be nice for a reference.
>>
>> Ken Kirkpatrick
>> N28546
>>
>>
>>
>> =========================
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>> t">http://www.matronics.com/Navigator?TeamGrumman-List
>> =========================
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>> cs.com
>> =========================
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>> matronics.com/contribution
>> =========================
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>>
>
>
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