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Mallard
Joined: 22 Oct 2019
Posts: 49
Location: Ireland
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 Posted: Thu Jul 07, 2022 1:22 am Post subject: What did you do with your Europa this week 7/2 - 7/9 |
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Very interesting Area 51! Can you tell us what you are listening for when balancing the carbs?
Thanks
James
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Area-51
Joined: 03 May 2021
Posts: 372
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| Posted: Thu Jul 07, 2022 4:41 am Post subject: Re: What did you do with your Europa this week 7/2 - 7/9 |
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That's a really great question James!
Firstly for safety reasons I don't recommend anybody ever stand near an active rotating propeller...
I'm listening to the differential sound of air being sucked into each carburettor.... it's a really old school method of shop tuning multiple throat setups. It's s bit like music, both, or all, because v12 dragons do exist, seperate throats need to have the same tone.
There are various meters on the market that can also be used that make the whole exercise pretty fool proof, but when you come up against 8 and 12 throat setups i find the listening tube method is much quicker as there is no setup time required.
Along with remaining attentive not to walk into the spinning propeller I found the air of the prop wash a bit of a challenge to work with so i used the rearward ear to listen, and chose to lower the faster throat than speed up the slower one.
(I'm also periodically lifting each carburettor piston about half way to determine which carburettor is running rich or lean than the other; and thats a whole seperate but related procedure)
Sometimes you may also hear crackly clicking or popping in a carburettor throat; this is indicative of un-atomised fuel entering the throat due to float levels being too high and it gets more prevalent as flooding begins.
The better the balance, mixtures included, the slower the engine can be idled smoothly; the 80hp could probably happily achieve 300rpm if not for the required cdi exciter speed and self destructive gearbox backlash. The 100hp would likely start hunting at about 900rpm due to valve timing.
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