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  #11  
Old 01-31-2019, 06:41 PM
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rocketbob rocketbob is offline
 
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Brake pads are easily replaceable, engines aren't. I wouldn't worry about them.

Always, always check timing before running an engine for the first time! Even if the engine has been run in a test cell. There is no reason not to do it.
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  #12  
Old 02-01-2019, 08:05 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by AviatorJ View Post
Did my run up today. It was about 60F out, the CHTs, especially on 5 & 6 were getting way too high. The brakes gave way at about 2500 so throttle down and decided to go to the hangar because of the temps.

Guess it's time to research baffling efficiencies.
Put a couple washers on the back baffle bolts. It will drop the temps down about ten degrees. Unfortunately, that bolt is only on one side.
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  #13  
Old 02-01-2019, 03:01 PM
AviatorJ AviatorJ is offline
 
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Quote:
Originally Posted by rleffler View Post
Put a couple washers on the back baffle bolts. It will drop the temps down about ten degrees. Unfortunately, that bolt is only on one side.
Sounds great, not sure what you mean though. The bolts holding the bracket in?
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  #14  
Old 02-02-2019, 12:38 AM
lr172 lr172 is online now
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by AviatorJ View Post
Sounds great, not sure what you mean though. The bolts holding the bracket in?
If you search "washer trick" you will find how to put a washer in the rear screw (between baffle & cyl) holding the aft baffle onto the #5 cyl. The search will show 4 cyl examples, but it is the same for your 540. It allows better air flow around the rear fins of #3/#5.
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  #15  
Old 02-02-2019, 07:34 AM
AviatorJ AviatorJ is offline
 
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Found it, thanks!
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  #16  
Old 02-02-2019, 07:48 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Default Go - - get ready for a safe first flight and . . .

Don't worry about that washer trick until you have compared your temps with some airspeed.
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  #17  
Old 02-02-2019, 03:33 PM
AviatorJ AviatorJ is offline
 
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Quote:
Originally Posted by BillL View Post
Don't worry about that washer trick until you have compared your temps with some airspeed.
Too late! I did it this morning and a handful of other things. This meant I had to do another run up to test the retiming of the mag, governor adjustments, among other things.

I seriously debated just waiting for my first flight, but too be quite honest I'm already anxious about the first flight and had to ensure (For my own self insurance) that my prop was going to pitch, not hit the ramair cowl and that I was going to be able to make full power. This time I did it on that taxiway right out front of my hangar. Used 3 chocks, parking brake and a winch attaching the tail to the jeep.

CHTs on 5&6 were still higher than the others, but over all noticeably lower than before. My Mags checked out great, it took a bit but got all the air out and the oil into the prop so that was working. Ramped her up to full power for about 15 seconds and she pegged at 2650. Minor adjustment of 25 RPM will be made prior to first flight.

All in all I'm now 100% confident that she'll get up and go and assuming we don't find any structural issues during the pre-inspection inspection then the DAR inspection should go great!
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  #18  
Old 02-03-2019, 02:10 AM
charrois charrois is offline
 
Join Date: Jan 2019
Location: Legal, AB
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Quote:
Originally Posted by AviatorJ View Post
Ramped her up to full power for about 15 seconds and she pegged at 2650. Minor adjustment of 25 RPM will be made prior to first flight.
Don't forget that static runup RPM will be lower than when you're actually moving down the runway. I chased what I thought might be issues with my governor or limits on the prop for some time thinking I wasn't anywhere near close enough to the 2700 I was looking for at full power until I did my first high speed taxi and found I'd overcompensated and then had to dial it back.
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  #19  
Old 02-03-2019, 10:03 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by BillL View Post
Don't worry about that washer trick until you have compared your temps with some airspeed.
I agree

The cooling system (baffles, etc) functions with airspeed in flight.
Making changes based on what you see with ground runs or taxiing is a waste of effort.
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