CamGuard....

[6 Gun]

I have often wonder if your using say 15-50 weight oil and add a bottle of camguard at oil change and every time you start up with a cold engine and take off after a short warm up what the oil weight really is at the time the engine is being run the hardest on T/O and climb?Same thing when you add AV Blend and cut the oil I would like to hear some fellow thoughts as to the effects.
Bob

[DanH]

IIRC, Continental is doing some kind of ongoing Camguard test. It will be interesting to see what they decide.

The Camguard website posts "humidity cabinet" test results...

http://www.aslcamguard.com/tech-data...midity-cabinet

...but my own experimental results were different.

http://www.vansairforce.com/communit...3&postcount=58

Regarding synthetic oil and camshafts....way back when, a particular race cam would wipe the hardfacing off Honda rocker arms. I was replacing a rocker arm after every race weekend, sometimes two. Switching to a popular half-synthetic motorcycle ended the problem.

[David-aviator]

Originally Posted by DanH

IIRC, Continental is doing some kind of ongoing Camguard test. It will be interesting to see what they decide.

The Camguard website posts "humidity cabinet" test results...

http://www.aslcamguard.com/tech-data...midity-cabinet

...but my own experimental results were different.

http://www.vansairforce.com/communit...3&postcount=58

Regarding synthetic oil and camshafts....way back when, a particular race cam would wipe the hardfacing off Honda rocker arms. I was replacing a rocker arm after every race weekend, sometimes two. Switching to a popular half-synthetic motorcycle ended the problem.

Excellent information Dan.
Your test ran longer and confirmed the protection is not very long. In fact CamGuard tests show protection for only 25 days if I read the results correctly.

Who was the guy that commented, fly often, he was right on.

[kaweeka]

Found this article FWIW.
http://www.avweb.com/news/maint/oil_..._197096-1.html

I found it interesting.

[BillL]

Originally Posted by hevansrv7a

When you burn gasoline in air you produce a lot of water vapor as a normal and essential component of the exhaust. In all engines but especially in our air cooled ones, a significant amount of that humid vapor gets past the pistons and into the lower regions. When you shut down your engine the air inside it is humid and hot. When you lower the temperature the humidity precipitates out because cool air simply cannot hold as much absolute moisture. None of this is news and none of this is debatable.

If you live in a place where the ambient relative humidity is near zero AND IF you immediately blow all the trapped humid air out of your engine then you don't have to worry about corrosion. If you fly the airplane every few hours before any of the oil drips off then ditto. But otherwise you'd be well advised to use an engine dehydrator either commercially obtained or home made. They are relatively inexpensive and very effective. Why is this so hard to understand?

I agree completely. A recent finding of how much water was condensed from a 540 short run combined with a separate test of putting water in a jug with a length of 5/8 hose equal to a breather tube. In 20 days, the container lost 1 gram of water out of 78. Ambient humidity is irrelevant to what the engine produces. It will not dry it self out in 30 days. 100% humidity.

A further experiment will be conducted to determine how much a hot crankcase vapor purge will lower the water trapped, vs a long term dehydrator. It is an outstanding idea, just needs some quantification. Some attach a vacuum cleaner to the oil fill for a short time (still hot) after in the hangar.

For now, I am convinced with some data that a dehydrator will drastically reduce the corrosion due to water vapor. TBO extension - no data. Wear - well, oil still has to be there on start. Camguard (or equal), a squirt of VCI on shutdown? Unknown, dreaming.

Sorry for being off the topic of the efficacy of Camguard vs alternative oil treatments.

Maybe we should invent an aircraft appropriate PCV system for our engines.

[Rupester]

Not intended as a hijack, but following up on Bill's comments, here is an old thread about inexpensive, homebuilt dehydrators ...

http://www.vansairforce.com/communit...ad.php?t=26286