On May 8, 2022, at 8:52 AM, Sam Hoskins <sam.hoskins@...> wrote:

I'm saying you need to calculate whatever shim(s) you need using the process outlined in the AeroVee manual. Everything you say about fitment is true, which is why I'm hoping to avoid shims. Maybe even eliminate some oil leaks to boot. One thing I've heard on the VW boards is that the copper heads shims require that you check and re-torque the head fairly often as the copper tends to "squish" over time - have you experienced that at all? Not sure how applicable the experience of VW drag racers really is to us...

I don't know nuthin' about the Revmasters, but I do want to relate what I know about one of our fatalities. Bob (his last name escapes me at the moment) had acquired a Q-2 with a Revmaster.  Prior to this, he had flown with me for better than an hour in my Q-200. 

I remember him saying something about tightening up his cylinders or heads. He was out flying one day and he had an engine failure. He put it into a plowed field and flipped over. There was a small fire, which did not consume the aircraft, but the coroner said he died of smoke inhalation. The FAA investigation said the cause of the engine failure was due to the cylinders (or heads?) not being torqued and loosed up.

Sorry I'm fuzzy on the details, but I'm sure it's discussed in the Q-List archives.

Be careful out there and proceed with knowledge.

Sam

On Sat, May 7, 2022 at 9:43 AM Mike Steinsland <MIKESKUSTOMS@...> wrote:

Keep it comin' 

I love it

This is all SOOO helpful

Thanks guys

You're making it a lot easier for me to make decisions 

Sure do appreciate it!

On Fri., May 6, 2022, 9:38 p.m. Michael Dunning, <dunningme@...> wrote:

Mike,
These videos aren't a great explanation of the process but they'll do:

1) Compression Ratio & Deck Height
2) Cylinder Barrel Shim Installation
3) Copper Head Shim Installation

Check out pages 20-21 of the AeroVee manual for a better explanation.

Troy,

I'm saying you need to calculate whatever shim(s) you need using the process outlined in the AeroVee manual. Everything you say about fitment is true, which is why I'm hoping to avoid shims. Maybe even eliminate some oil leaks to boot. One thing I've heard on the VW boards is that the copper heads shims require that you check and re-torque the head fairly often as the copper tends to "squish" over time - have you experienced that at all? Not sure how applicable the experience of VW drag racers really is to us...

You'll notice that all the numbers in the 80's Revmaster brochure check out when using the stock VW 1mm / 0.040in deck height and 55cc heads. I plan to cc my "75 HP" as-delivered heads for practice while I'm waiting on my new heads and will post the results. Still need to laser cut the plastic discs though.

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-MD
#2827 (still thinking about planning on visualizing how to finish building)