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recapen(at)earthlink.net
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 Posted: Mon Mar 09, 2009 6:40 am Post subject: Engine Break-in |
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Please look at the attached spreadsheet and graphs.
This was from a flight Saturday. I now have 5.9 flight hours on it with another .7 of ground run to verify stuff prior to first flight. I recall additional running time on the test stand for original build and subsequent rebuild for the crankshaft AD.
The airframe is a Van's RV6A with SamJames cowl/plenum and three blade MT constant speed prop. The oil cooler is mounted behind #4 and both heaterbox take-offs are behind #3.
The CHT and EGT graphs track fairly close to each other and the oil temp looks good too. My oil consumption was about a quart and a half for the first three hours and was almost none for this one-hour flight. I expected a longer oil consumption period and still plan to fly the high power profiles for a while - until I can verify reduced oil consumption with a few more flights.
Your comments on the data would be appreciated.
Thanks for a great engine,
Ralph Capen
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Download |
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90307124.xls |
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2.67 MB |
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123 Time(s) |
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aaaron(at)tvp.com.au
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| Posted: Mon Mar 09, 2009 3:01 pm Post subject: Engine Break-in |
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Ralph
I'm actually pleased that you misdirected it. I have an IO320 in my
mustang II with about 30 hours on it. I have a plenum and a similar oil
cooler and air inlet set-up, I believe. My EGT's and CHT's differ
between cylinders by about 85 degrees (with #3 being the hottest) -
yours seem really close. I wonder what is different?
Allan
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jbr79r(at)yahoo.com
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| Posted: Mon Mar 09, 2009 3:51 pm Post subject: Engine Break-in |
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EGTs are balanced by injector size CHTs are refined by baffeling. You might consider moving injectors from hot to cold EGT and see if the temps follow the injectors. If that works consider Gami injectors. I have a six cyl Lyc and all my cylinders are very close.
James Robinson
Glasair lll N79R
Spanish Fork UT U77
From: Allan Aaron <aaaron(at)tvp.com.au>
To: aeroelectric-list(at)matronics.com
Sent: Monday, March 9, 2009 2:55:32 PM
Subject: RE: Engine Break-in
--> AeroElectric-List message posted by: "Allan Aaron" <aaaron(at)tvp.com.au (aaaron(at)tvp.com.au)>
Ralph
I'm actually pleased that you misdirected it. I have an IO320 in my
mustang II with about 30 hours on it. I have a plenum and a similar oil
cooler and air inlet set-up, I believe. My EGT's and CHT's differ
between cylinders by about 85 degrees (with #3 being the hottest) -
yours seem really close. I wonder what is different?
Allan
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