RV-6 engine replacement

[Dave12]

There are many 320?s in the fleet well beyond tbo. Some have even doubled tbo. Some more than double tbo. That is a hardy engine.

[titanhank]

Originally Posted by Mark33

Gil, can you tell me “approximately” how much further the 320 mount pushes the engine out as compared to the 360 mount? I’m thinking about using the 320 mount on my Catto prop equipped PV 360 -7 build to help with W&B.

I measured two rv6 yesterday to verify engine mounts and placement. Rv6 with 0360 measures 10.5” from firewall to acc case split line. My rv6 with 0320 measures 11 1/8” from firewall to acc case split line. The 320 mount seems to move the engine 5/8” further forward on my two examples.

[Sam Buchanan]

Originally Posted by JonJay

By the way, the Bucker’s 0320 made it over 2300 hours. I flew it for ten years after TBO. Per Sam’s point.

Jon, we have a newly arrived Bucker at DCU.....cool plane.

[newt]

Originally Posted by JonJay

Allows you to power manage sooo much better some say it?s cheating!
I flew with many O320 fixed pitch guys in formation and the only time the experienced guys had an issue was when one of us CS guys got behind and cheated or lead didn?t hold standard

Throw the chute out, or throttle forward and watch those hapless fixed pitch guys scramble! Unfair.....

One of these days I'm going to hand my RV's keys to one of the CSU owners in my formation group and find out just how good they really are

https://www.youtube.com/watch?v=tkUxspoeZzk

- mark

[Mark33]

Originally Posted by titanhank

I measured two rv6 yesterday to verify engine mounts and placement. Rv6 with 0360 measures 10.5? from firewall to acc case split line. My rv6 with 0320 measures 11 1/8? from firewall to acc case split line. The 320 mount seems to move the engine 5/8? further forward on my two examples.

Perfect....that?s the information I was looking for!! I?ll bet that little bit of difference will make a measurable change in CG and W&B.

[highflight42x]

By changing from carb to injection, you might have some 'splaining to do with regard to FAR 21.93. My insurance company has made a point of asking every year at renewal time, among other things, whether I've made any fuel system changes. FWIW: I've got 21 years of flying my carb'd 0-320 in Pacific NW weather, had carb ice once on the ground.

Cheers!

- Steven, 1300 RV-3 hours, another one on New Years Day! Aaaand ... its the Dark Ages around here. I think the bad-weather Jet Stream is, like, directly over my home airport

[JonJay]

Originally Posted by Sam Buchanan

Jon, we have a newly arrived Bucker at DCU.....cool plane.

Beg, borrow, or steal a ride and take the stick. While they aren?t the same airplane two up, close enough. No disrespect to my beloved 6, but the Jungmann still puts that smile and feeling I had in my early years of flying, every time I take it up. Wouldn?t trade my 6 for it though. Lucky to be able to have both.

[newt]

Originally Posted by highflight42x

By changing from carb to injection, you might have some 'splaining to do with regard to FAR 21.93.

Australia has no time for caring about FAR 21.93.

- mark

[az_gila]

Originally Posted by titanhank

I measured two rv6 yesterday to verify engine mounts and placement. Rv6 with 0360 measures 10.5? from firewall to acc case split line. My rv6 with 0320 measures 11 1/8? from firewall to acc case split line. The 320 mount seems to move the engine 5/8? further forward on my two examples.

I think you must have a later plans version than mine, or they are not RV-6s.

My plans show sheet 50, R-1 dated 9/92 and only one size of engine mount.

[Snowflake]

Another data point on Carb Ice... I've had it on the ground a number of times, and in the air as well. Never to the point where the engine stumbled or quit, but checking carb heat occasionally has cleared "something" that resulted in an RPM increase afterwards.

I suspect that anyone flying with the stock carb heat setup (the tiny tube that crosses the crossover tube) doesn't have enough heat to affect anything anyway, so there may be some carb ice happening that only goes so far and never causes in-flight issues. Certainly, the stock setup isn't enough to even register a change on the RPM gauge on the ground. I switched to a Robbins Wings muff on my crossover pipe when I bought my -6, and now get a definite 50rpm drop when the carb heat is engaged.