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mikeperkins
Joined: 22 May 2007
Posts: 123
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 Posted: Fri Mar 19, 2010 10:07 am Post subject: Fuel requirement for 532 |
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A notable expert in 2-stroke engines was recently quoted has having said that non-ethanol 87 octane can be used in two-stroke Rotax engines. However, so far the only written information I've found about it mentions the 447, 503, and 582; the 532 is not mentioned.
I'd like to stop toting 92 octane to the airport in jerry cans when non-ethanol 87 octane auto fuel soon becomes available at my home airport. But I recently reviewed my 532 engine manual for fuel specifications and found the basis for my use of 92 octane fuel (premium) the 532. I've attached a copy of that page to this post. It specifies 87 MON minimum and 96 RON minimum. Since the AKI rating on American pumps is calculated as RON+MON/2, the fuel requirement for a 532 would be 91.5 AKI.
In other recent research, I learned that dual ignition engines tolerate somewhat lower octane fuels than an identical engine with single ignition - the flame front from two spark plugs burns the fuel faster in the chamber. My understanding is that this prevents detonation that would be more likely to occur with a single spark plug. That may or may not account for use of 87 in 582s when its use in a 532 was put in writing. I don't know.
In any case, right now it seems that I’m left with some conflicting information. To use 87 AKI, prudence would call for some flight testing accompanied with frequent internal engine inspection.
I'm not trying to start a fuel debate or an ethanol discussion war. I'm looking for factual information from you guys who fly behind 532s and 582s related to using non-ethanol 87 octane but who also keep track of the condition of their pistons, plugs, and cylinders through inspection. I would appreciate hearing from you.
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Rotax 532 manual - fuel specification.pdf |
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dave
Joined: 22 Sep 2006
Posts: 1382
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