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llemay1(at)austin.rr.com
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 Posted: Tue Jan 17, 2006 12:15 pm Post subject: CYL high temp |
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Anyone have any new ideas on how to bring down the CYL temp on a new Mattituck O-360 RV-7 with plenum chamber? Have plugged most holes..placed horizontal flanges on top inside of plenum near the split in the cyl heads, and cut off 1 inch across the middle bottom of the under cowling. Started with over 425 on # 3 & 4 with 70% power and have them down to about 380 with 55 F OAT. Will need more room when it gets hot...........Now have 40 hours and consider it broken in...Lowell
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jclarkmail(at)gmail.com
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| Posted: Tue Jan 17, 2006 12:31 pm Post subject: CYL high temp |
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Lowell ...
Are cylinders 1 & 2 extra cool?
If so, maybe an air dam in from of them will divert some of the cooling air
to 3 & 4.
James
On 1/17/06, lowell lemay <llemay1(at)austin.rr.com> wrote:
| Quote: |
Anyone have any new ideas on how to bring down the CYL temp on a new
Mattituck O-360 RV-7 with plenum chamber? Have plugged most holes..placed
horizontal flanges on top inside of plenum near the split in the cyl heads,
and cut off 1 inch across the middle bottom of the under cowling. Started
with over 425 on # 3 & 4 with 70% power and have them down to about 380 with
55 F OAT. Will need more room when it gets hot...........Now have 40 hours
and consider it broken in...Lowell
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--
This is an alternate email. Please continue to email me at
james(at)nextupventures.com .
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Jan 17, 2006 3:24 pm Post subject: CYL high temp |
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Make sure you have at least a 1/8" gap behind the #3 cylinder to allow air
to flow between the baffling and the cylinder. If you don't, no air will
flow on the back side of the head. Don't know why you have trouble with
#4.
Also, be sure the baffles on the underside of the cylinders are up tight
against the cylinder fins.
lowell lemay said:
| Quote: |
Anyone have any new ideas on how to bring down the CYL temp on a new
Mattituck O-360 RV-7 with plenum chamber? Have plugged most
holes..placed horizontal flanges on top inside of plenum near the split in
the cyl heads, and cut off 1 inch across the middle bottom of the under
cowling. Started with over 425 on # 3 & 4 with 70% power and have them
down to about 380 with 55 F OAT. Will need more room when it gets
hot...........Now have 40 hours and consider it broken in...Lowell
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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lhelming(at)sigecom.net
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| Posted: Tue Jan 17, 2006 4:17 pm Post subject: CYL high temp |
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You should also check the cooling fins in the area around the spark plugs.
On my TMX last year, I found some of them filled up with some sort of slag
or manufacturing stuff. (I could not see through when shining a light on
the other side so that air could flow through) I had to drill through it
and file it out using a real small file. Also putting a washer behind the
#3 cylinder to create a gap between the cylinder and the baffle is a good
thing to do.
Indiana Larry
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alexpeterson(at)earthlink
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| Posted: Tue Jan 17, 2006 7:04 pm Post subject: CYL high temp |
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| Quote: |
Anyone have any new ideas on how to bring down the CYL temp
on a new Mattituck O-360 RV-7 with plenum chamber? Have
plugged most holes..placed horizontal flanges on top inside
of plenum near the split in the cyl heads, and cut off 1 inch
across the middle bottom of the under cowling. Started with
over 425 on # 3 & 4 with 70% power and have them down to
about 380 with 55 F OAT. Will need more room when it gets
hot...........Now have 40 hours and consider it broken in...Lowell
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Do you have a MP gauge and fuel flow gauge? Temps are dramatically affected
by subtle mixture changes. Do you have EGT's on all four exhausts? If you
have all this equipment, you can do a graph of fuel flow vs EGT's. This
might identify if the fuel/air charge is somewhat balanced (see where the
peaks are relative to one another). Do you have EI or FI? If things are
balanced, you might be able to run LOP, which will cool the cylinders by
about 40 to 50 degrees F.
Alex Peterson
RV6-A N66AP 705 hours
Maple Grove, MN
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mark.doble(at)mddesigns.c
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| Posted: Wed Jan 18, 2006 7:13 am Post subject: CYL high temp |
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Have you calibrated your thermocouple sensors?
You can get calibration charts from here....
EGT
http://www.stratologic.net/Downloads/Type%20K%20Chart.pdf
CHT
http://www.stratologic.net/Downloads/Type%20J%20Chart.pdf
i've seen some instruments off by 30-40degrees
I have a plug-in thermocouple calibrator that can easily checkout the
instrument...i've used it on a few instruments and it has been great to
track down inaccuracies.
Also, you can use an iron and a high temp thermometer if you cant generate
the required millivolts easily.
Walmart or some other store sells a digital cooking thermometer that is
fairly accurate that you can use as a reference up to 392F and is accurate
to 1-2F (you can check this out by ice bath and boiling water...easy
references). There is another model that is good up to 260C (or 500
something F).
At least would give some confidence in the instrument and would be a good
starting point.
regards,
Mark.
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