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Help with engine issue!!!!
Tiring to get my RV6A off the ground but have some problems to solve. I have an 0-320 H2AD freshly overhauled in the aircraft. The first time I ran it it seemed fine but I did not do a mag check or run it over 1600 rpm. Cht,s where all in the mid 300,s and I had one cylinder with a higher EGT (#3) than the others, since then I have be told this is normal.
I borrowed a timing box and thought I would check the timing, what I found was the left mag was about 1 Deg ahead of the other. (H2AD has 2 mag,s in one) A local A&P told me it might not make much difference so try it as set, and see how much mag drop you get. So I timed to 25 deg advice and ran the engine up. It seemed ok but when I ran it up to 1800 I would a 25 rpm drop on one and a 200 rpm drop on the other I also got much higher CHT,s , The cowling was on this time which would account for some temp rise but when I did a high speed taxi (55-60 mph) the temps climbed to 450 (Lycoming says 500 deg is max but I think that?s too high) so I backed off put the plane away and when home.
The following weekend I removed the cowl and rechecked the timing which seemed ok. I replaced a suspect plug and ran it up again, same thing 25 ? 50 rpm drop on left mag 200 rpm drop on right, CHT,s were back to 350 ( No cowl) but when I tried to go above 1800 rpm the engine began missing. I now have the mag on my work bench, I made adjustments to the internal timing so that both contacts open within ? deg of each other at the 8 deg ?E? gap position. There are two windows where you can view the gear teeth, both left and right. When I line up the mag to the ?E? gap mark one red tooth is dead center of the window and the other is off by ? tooth.
Questions:
? Any Idea why my CHT,s would be getting so high with the cowling on
? What would cause the missing above 1800 rpm,s
? Why dont both red teeth line up in the center of there respective windows.
I was hoping to get my first flight in in the next few days but it does not look good, so any help would be more than appreciated.
Thanks
Tiring to get my RV6A off the ground but have some problems to solve. I have an 0-320 H2AD freshly overhauled in the aircraft. The first time I ran it it seemed fine but I did not do a mag check or run it over 1600 rpm. Cht,s where all in the mid 300,s and I had one cylinder with a higher EGT (#3) than the others, since then I have be told this is normal.
I borrowed a timing box and thought I would check the timing, what I found was the left mag was about 1 Deg ahead of the other. (H2AD has 2 mag,s in one) A local A&P told me it might not make much difference so try it as set, and see how much mag drop you get. So I timed to 25 deg advice and ran the engine up. It seemed ok but when I ran it up to 1800 I would a 25 rpm drop on one and a 200 rpm drop on the other I also got much higher CHT,s , The cowling was on this time which would account for some temp rise but when I did a high speed taxi (55-60 mph) the temps climbed to 450 (Lycoming says 500 deg is max but I think that?s too high) so I backed off put the plane away and when home.
The following weekend I removed the cowl and rechecked the timing which seemed ok. I replaced a suspect plug and ran it up again, same thing 25 ? 50 rpm drop on left mag 200 rpm drop on right, CHT,s were back to 350 ( No cowl) but when I tried to go above 1800 rpm the engine began missing. I now have the mag on my work bench, I made adjustments to the internal timing so that both contacts open within ? deg of each other at the 8 deg ?E? gap position. There are two windows where you can view the gear teeth, both left and right. When I line up the mag to the ?E? gap mark one red tooth is dead center of the window and the other is off by ? tooth.
Questions:
? Any Idea why my CHT,s would be getting so high with the cowling on
? What would cause the missing above 1800 rpm,s
? Why dont both red teeth line up in the center of there respective windows.
I was hoping to get my first flight in in the next few days but it does not look good, so any help would be more than appreciated.
Thanks