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Old 09-19-2018, 08:32 AM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 483
Default Measuring Crankcase Pressure

What are folks using to substitute for the oil filler cap/dipstick when installing a pressure measuring tap to measure crankcase pressure? As much as I have searched, I can't seem to find any definitive information on the thread size. I'd like to find some sort of threaded metal or plastic cap that fits the filler tube that I could then drill and tap for a tube fitting to connect to my digital manometer.
Any ideas?
Dan Langhout
2019 =VAF= Dues PAID . . . . .
RV-7 N528DP slow build
First Flight July 26th, 2014
462 hours and counting . . . .
Now based at Moontown (3M5)
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Old 09-19-2018, 09:13 AM
RVDan RVDan is offline
Join Date: Jun 2012
Location: Frederick, MD
Posts: 616

Can't help on the tread info, but why not use one of the existing pipe threaded ports on the accessory housing that just go into the crankcase volume?
Dan Morris
Frederick, MD
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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Old 09-19-2018, 09:16 AM
Alan Bumbaugh Alan Bumbaugh is offline
Join Date: Mar 2010
Location: Lubbock, Texas
Posts: 7
Default Dip Stick Threads

I just measured mine and both appear to be 1-1/8 O.D. X 12 inch pitch. The cap with the dip stick major diameter is smaller.
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