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MMO in an engine
http://t18.net/thorpforum/viewtopic.php?f=35&t=7224		 Page 2 of 2
Author:  3Dreaming [ Sun Feb 17, 2013 9:44 am ]
Post subject:  Re: MMO in an engine
James Grahn wrote:
Yeah I did that to the one that failed a few years ago. So here is what I learned today. Compression testers go bad!,! We used two different testers and got two different results. I finally used the spark plug fitting off the second tester with the valves and gauges off the first. The results were much better. Then I changed to O rings on both and did it again. My final results are fly able. I am now at 67,72, 74, 71!! That is a fair sight better than yesterday morning. Whew! Thanks for all the help guys.
Cubes


He must have grabbed the tester that they use when things are slow in the shop. >:D
Author:  James Grahn [ Mon Feb 18, 2013 1:37 pm ]
Post subject:  Re: MMO in an engine
It was the same tester I used last year. In fact, the last time the tester was used was on my engine! Go figure.
Cubes
Author:  jrevens [ Mon Feb 18, 2013 1:54 pm ]
Post subject:  Re: MMO in an engine
Sounds like it was the spark plug hole adapter, & not the "tester" per se. I'm sure glad you're engine's OK Cubes!
Author:  James Grahn [ Mon Feb 18, 2013 3:10 pm ]
Post subject:  Re: MMO in an engine
On one it was the adapter or the hose that connects it. On the other, it was the gauges. I used the adapter from the second with the gauges from the first.
Cubes
Author:  Rich Brazell [ Mon Feb 18, 2013 7:31 pm ]
Post subject:  Re: MMO in an engine
I guess that's why we sent torque wrenches , tire pressure gauges and other tools to the calibration shop to see if they were in specs . What kind of compression tester is it ? Brand name/company .

RB O0
Author:  James Grahn [ Tue Feb 19, 2013 4:36 pm ]
Post subject:  Re: MMO in an engine
Dunno. Ill look Saturday.
Cubes
Author:  Brent Schultz [ Fri Mar 01, 2013 10:44 am ]
Post subject:  Re: MMO in an engine
I have been told to never put MMO in the oil. We are approaching 1000 hours on N6CM. All cylinders are 70psi.
Author:  James Grahn [ Fri Mar 01, 2013 11:20 am ]
Post subject:  Re: MMO in an engine
That's the first I've heard of that. Mine are all about 70 as well. Not sure what it can do wrong. But I may stop for a while and re-borescope after a few hundred.
Cubes
Author:  Brent Schultz [ Fri Mar 01, 2013 1:33 pm ]
Post subject:  Re: MMO in an engine
Google MMO and/or TCP and you will find good articles about them both. I have been told MMO should only be used in the fuel. Never in the oil from people who have been using it for many years. We use half of the recommended amounts shown on the MMO container. I have been told MMO was made in WWII for the big recepts to help them with carbon buildup problems in the cylinder heads. I here in the oil it changes the viscosity and you do not want that. In any event, I have only mixed it in with fuel and our 1000 hour 0-290G does not burn oil, has good oil and cylinder pressures.
Author:  Jim Mantyla [ Fri Mar 01, 2013 2:05 pm ]
Post subject:  Re: MMO in an engine
Guys,
When I had my Stinson 108-3 with the 165 Franklin using MMO was a must in the gas. It apparently lubricated the valve stems and kept them from sticking due to lead build up. I never put in tin the oil though. I used it over the course of about 8 years and never had a valve stick. I know a few C150 owners that also use it for the same purposes now that we can only get 100LL in this area.

Jim
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