lndwarrior
Well Known Member
The engine is an o-235-C1, the carb is the MA-3A without the accelerator pump. I have been flying this for 6 years.
Four months ago the engine developed idle problems. Rough running, engine dying. I spent a bunch of time going through the entire fuel system. Put new filters in, checked all the screens and lines, checked for intake leaks, etc. I spent a quite a bit of time adjusting the mixture/idle setting on the carb and it seemed to solve the problem.
Today, on take-off with my hand holding the throttle in, the rpm did not reach normal takeoff rpm, and then the rpm started dropping even though I was still holding the throttle in.
I pulled into the runup area, leaned it out and did a high rpm run for 30 seconds or a little longer. The mag drop was in specs. Also, these Bendix mags were bought brand new and installed a year ago.
Did 4 more high speed taxi tests and could not achieve take-off power. I came away feeling this plane is trying to tell me something, maybe for some time. I also decided I was not flying it again until I have the carb inspected or replaced.
I have no history at all on this carburetor. No idea the number of hours or if/when it was last over-hauled. It came with the used engine.
At this point I am pulling it. My only question is to try an IRAN - or just buy a new/overhauled carb?
I am clearly leaning towards a overhauled/rebuilt one from AS.
This carb is clearly an older one but I'm just wondering if there is any reason to IRAN this one rather than buy a newer rebuilt/overhauled one?
To be clear I am not trying to save $500 or whatever between a possible IRAN and a rebuilt/overhauled unit. Plus the inherent delays in an IRAN process, when I can just order a rebuilt/oh'd unit today.
I vaguely recall in some cases "the old ones were better than the new ones" but have no idea of this relates to my carb at all. This is the crux of why I am asking the question.
Any valid reason to have this old one rebuilt rather than buy a newer overhauled/rebuilt unit, if money is not a consideration?
Four months ago the engine developed idle problems. Rough running, engine dying. I spent a bunch of time going through the entire fuel system. Put new filters in, checked all the screens and lines, checked for intake leaks, etc. I spent a quite a bit of time adjusting the mixture/idle setting on the carb and it seemed to solve the problem.
Today, on take-off with my hand holding the throttle in, the rpm did not reach normal takeoff rpm, and then the rpm started dropping even though I was still holding the throttle in.
I pulled into the runup area, leaned it out and did a high rpm run for 30 seconds or a little longer. The mag drop was in specs. Also, these Bendix mags were bought brand new and installed a year ago.
Did 4 more high speed taxi tests and could not achieve take-off power. I came away feeling this plane is trying to tell me something, maybe for some time. I also decided I was not flying it again until I have the carb inspected or replaced.
I have no history at all on this carburetor. No idea the number of hours or if/when it was last over-hauled. It came with the used engine.
At this point I am pulling it. My only question is to try an IRAN - or just buy a new/overhauled carb?
I am clearly leaning towards a overhauled/rebuilt one from AS.
This carb is clearly an older one but I'm just wondering if there is any reason to IRAN this one rather than buy a newer rebuilt/overhauled one?
To be clear I am not trying to save $500 or whatever between a possible IRAN and a rebuilt/overhauled unit. Plus the inherent delays in an IRAN process, when I can just order a rebuilt/oh'd unit today.
I vaguely recall in some cases "the old ones were better than the new ones" but have no idea of this relates to my carb at all. This is the crux of why I am asking the question.
Any valid reason to have this old one rebuilt rather than buy a newer overhauled/rebuilt unit, if money is not a consideration?