Running my DA85 on the bench with no muffler. OK?
03-02-2010, 07:19 PM
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Running my DA85 on the bench with no muffler. OK?
I folks,
Got my engine back from DA with the latest updates and I wish to run my engine on the bench. However I am unable to install the muffler due to the fact the engine is directly bolted to the bench (DA recommendation).
Can I run the engine without the muffler? Any chance of running lean or something?
Thanks
Got my engine back from DA with the latest updates and I wish to run my engine on the bench. However I am unable to install the muffler due to the fact the engine is directly bolted to the bench (DA recommendation).
Can I run the engine without the muffler? Any chance of running lean or something?
Thanks
03-03-2010, 05:20 AM
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RE: Running my DA85 on the bench with no muffler. OK?
There are tuning needles on the carb. Set them as required by the application.
If the application changes, reset the needles.
If the application changes, reset the needles.
03-03-2010, 05:33 PM
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RE: Running my DA85 on the bench with no muffler. OK?
Tony,
I don't suggest it either. Unless you have everything done right it's quick and easy to make bad things happens. In flight break in is much better, but even that needs to have some attention given to the process. Which is something only a couple of manufacturers address in their manuals.
However, you are not going to get everyone to break in their engines the way they should, so perhaps it's a good idea for you folks to come up with some printed do's and don'ts for the people that will insist on performing bench runs. For the record, I bench run engines, yours and others, all day, everyday, with excellent results. Others may have similar capabilities but those need to be addressed by the manufacturer in order for people to perform the process correctly. Until then manufacturers will keep getting new engines back with stuck rings and/or loaded up with carbon from newbie gas engine owners.
I don't suggest it either. Unless you have everything done right it's quick and easy to make bad things happens. In flight break in is much better, but even that needs to have some attention given to the process. Which is something only a couple of manufacturers address in their manuals.
However, you are not going to get everyone to break in their engines the way they should, so perhaps it's a good idea for you folks to come up with some printed do's and don'ts for the people that will insist on performing bench runs. For the record, I bench run engines, yours and others, all day, everyday, with excellent results. Others may have similar capabilities but those need to be addressed by the manufacturer in order for people to perform the process correctly. Until then manufacturers will keep getting new engines back with stuck rings and/or loaded up with carbon from newbie gas engine owners.
