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Old 11-16-2017, 11:01 PM   #26
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Then got a quote from Penn Yan 18-21 depending on OH steel, Nickel, or new factory. Anyone know why Penn Yan is 5K less than everyone else?
Well, I found out why they were 5K less.... When I called to get ready to find out how to ship the engine, the cost went up 10K. They claimed they quoted me an 0320.


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Old 11-17-2017, 06:21 PM   #27
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Wow, that's not a good sign. Hopefully they're paying more attention to the terms of the rebuild contract.


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Old 11-21-2017, 10:46 PM   #28
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I am meanwhile in the process of overhauling my engine. When my engine guru split the crankcase, we found a broken main bearing that has worked into the crankcase. We are not sure if this is repairable. If not, my A&P IA suggests to replace the crankcase and go the roller tappet route.
Is there any experience with that technology and aerobatics out there?
Thanks Mike
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Old 11-21-2017, 10:59 PM   #29
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I have roller tappets on my IO360. They are supposed to be better for the cam by rolling on it instead on sliding on it. From a lubrication stand point it makes much more sense. In my whopping 65 hrs TT i can say they are working great hahaha
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Old 11-22-2017, 05:26 PM   #30
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Roller is the way to go.
Has been for years but cost and complexity kept it from cars etc till recent years. Going roller lifters/cam in a car is noticeable even with cam profile the same and everything else the same. Less friction spools up faster. It’s also why Zinc was taken out of most oil. If you have a older car (anything older than about 1988ish) you need to add a zinc additive to most oil. Valvoline VR1 oil is the only easily available outside of Specialty race shops etc that has the “old zinc” quantities I know of. I use it and a bottle of Lucas Engine Breakin additive in my old stuff at each oil change.

All this aside...Aviation oil I “think” the zinc is still in it. But I still use Camgaurd in all the engines I maintain. It helps with internal rust issues also. It gets deeper and stays on longer in the metal pores of the engine components. But you don’t use it till the engine is good and broke in. (50 hrs or so)

If I had a choice...roller tappets all the way! Or you could just have a overhead cam engine like a Ranger with roller tipped rockers.
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Old 11-22-2017, 06:12 PM   #31
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I upgraded to roller as my case was cracked. Was not cheap! I cant tell any difference acro wise. Have about 100hrs or so since PenYan did it.
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Old 11-24-2017, 12:15 PM   #32
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Thanks for your replies. Need to check what it means in $$$ 😉


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