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Compression Test

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rhdudley1(at)bellsouth.ne
Guest

Posted: Wed Nov 08, 2006 6:07 pm Post subject: Compression Test

Listers,



I read in some descriptions of the differential compression test that 

for engines with displacement under 1000 cubic inches the orifice of the 

tester should be .040" and above 1000 ci the orifice should be.060". 

Some catalogs distinguish between <5" bore and > 5" bore rather than 

displacement. My O-320 is 5.125" bore and 320 cubic inches. I want to 

purchase the appropriate tester.

I would appreciate your advice.



Thanks in advance.



Richard Dudley

-6A flying

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Nov 08, 2006 6:58 pm Post subject: Compression Test

The FAA  guidance in AC43-13-1b was changed, to the under/over 5" 

designator by someone that doesn't have a clue about engines, as every 

Lyc bigger than an O-290 has greater than 5" bore and has been tested by 

the standard tester for eternity. The high volume tester is for radial 

engines.

Just get the regular .040 orifice model.



Richard Dudley wrote:

 	  Quote: 	
		   



 Listers,



 I read in some descriptions of the differential compression test that 

 for engines with displacement under 1000 cubic inches the orifice of 

 the tester should be .040" and above 1000 ci the orifice should 

 be.060". Some catalogs distinguish between <5" bore and > 5" bore 

 rather than displacement. My O-320 is 5.125" bore and 320 cubic 

 inches. I want to purchase the appropriate tester.

 I would appreciate your advice.



 Thanks in advance.



 Richard Dudley

 -6A flying

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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