Significant loss of power?!?!? Timing? Cam?

[GEM930]

WOO HOO!!!!!

The MTH was only hand tight!!!! I'm an idiot! Hopefully I did not burn a valve! I guess I can't attribute my reduced chts to breaking the engine in. Oh well.... I Would rather look for better cooling options then have to fly around at 14gph and 144kts. As far as the crank trigger... I have one of those too ,on the back up system. I did not switch to that system to check as it is throttle body induction (not port) and I have not been able to get it to run well enough to make me feel comfortable switching to it in flight. It's kinda a limp home deal right now as it only runs well at high mp. Thanks for all the help!!! I'll report back once I get it timed again.

Gem

[rv6ejguy]

Originally Posted by GEM930

WOO HOO!!!!!

The MTH was only hand tight!!!! I'm an idiot! Hopefully I did not burn a valve! I guess I can't attribute my reduced chts to breaking the engine in. Oh well.... I Would rather look for better cooling options then have to fly around at 14gph and 144kts. As far as the crank trigger... I have one of those too ,on the back up system. I did not switch to that system to check as it is throttle body induction (not port) and I have not been able to get it to run well enough to make me feel comfortable switching to it in flight. It's kinda a limp home deal right now as it only runs well at high mp. Thanks for all the help!!! I'll report back once I get it timed again.

Gem

Glad you found this. Hope you are back to 180 knots and proper fuel burn and temps without any damage.

[flyinmonque]

What is this MTH you speak of? I'm sure I do not have your system but have no idea what your talking about! Mouse Turning Horsepower?

[krw5927]

Originally Posted by flyinmonque

What is this MTH you speak of? I'm sure I do not have your system but have no idea what your talking about! Mouse Turning Horsepower?

It's all in the first post.

Originally Posted by GEM930

The timing is picked up using a unit made by Electroair (MTH) that mounts to one of the mag locations. It is adjusted the same as any regular mag. I'm thinking (hoping) it's lose and has slipped.

[GEM930]

Thanks for all the advise. I hope I did not damage anything. I have no way of knowing how retarded it was as I turned it by hand to check it, but I checked the data from my EFIS and it looks like the egts got to 1650 a couple times... That can't be good for the valves if they are partially open! I'll do another leakdown test soon.

[PCHunt]

Quote:
Originally Posted by flyinmonque View Post
What is this MTH you speak of? I'm sure I do not have your system but have no idea what your talking about! Mouse Turning Horsepower?
It's all in the first post.

Quote:
Originally Posted by GEM930 View Post
The timing is picked up using a unit made by Electroair (MTH) that mounts to one of the mag locations. It is adjusted the same as any regular mag. I'm thinking (hoping) it's lose and has slipped.
__________________

Does "MTH" actually stand for something? Looks like it is an RPM sensor of some sort?? Guessing: Mag Tach Holder??? maybe Harness??

Can someone translate?

Hate acronyms. (HA)

[Sid Lambert]

Mag Timing Housing ( MTH )

[Aggie78]

Situations like this problem and my relative ignorance of aircraft engines and their operation are why I have an engine monitor and pay for Mike Busch's SavvyAnalysis service.

A data dump after 1 flight with the problem would have very likely gotten an immediate pointout from the service and a direction in which to troubleshoot.

I am tracking down some high CHT issues, and the service is helping my efforts significantly.

Also, here are a couple of links to some good articles by Mike about CHT, EGT and how not managing one's engine properly can trash it in an incredibly short period of time:

http://blog.aopa.org/opinionleaders/...y-your-engine/

https://www.savvyanalysis.com/articl...myths-debunked

Blue Skies,

Rob S.

[GEM930]

[quote=Aggie78;978895]Situations like this problem and my relative ignorance of aircraft engines and their operation are why I have an engine monitor and pay for Mike Busch's SavvyAnalysis service.

A data dump after 1 flight with the problem would have very likely gotten an immediate pointout from the service and a direction in which to troubleshoot.



I think your correct!!! Especially after seeing the post by Rv6ejguy stating my EGTs would be high. If I were smarter I would have caught it. I have no doubt the SavvyAnalysis guys would have caught it. I have an MGL Voyager and while I know Savvy supports it, I tried using it once and it did not seem to want to play nice with my MGL. MGL has there own viewer, which is what I have been using, but as this situation points out the information gained from the data is only as good as the person looking at it. I'm just glad the timing slipped regarded instead of advanced!

[GEM930]

I flew tonight.... Much better... 1480 ft/min at 110kts climb from take off. Airport elevation is 245'. 167 kts at 2000' (2500 msl) wot at 2500rpm, 81 degrees F (not quite vans specificstions, but much better than I was seeing). My 179 knot run was similar oat but at 5000 (5245 msl). Not sure where the optimum altitude for top speed run is??? Anyway better than I was seeing. I'm happy. Thanks for all the posts.