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#11
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G.R. Patterson III wrote: Jay Honeck wrote: Right. Which makes me wonder why they don't simply come out with an STC that specifies the use of higher octane auto gas (as in the example, above), rather than simply not having a mogas STC for the high-compression O-540. Didn't we just go through a discussion (in which you took part) to the effect that there *is* an STC for the engine? It's the airframe under discussion that lacks an STC. That's true. In addition to detonation margins, the STC holder also has to test for fuel flow characteristics. Petersen's web site points out that most gravity feed fuel systems don't have a problem there, but those requiring a pump system have varying results. As a result, some STCs like the one for my PA28 with an O-360, require pump and fuel system modifications in order to qualify. Other airframes could probably be STCed in a similar way, but there may not be enough of a perceived market for development to be cost effective. An example might be the Grumman Tiger. It's siblings, the Cheetah and Traveller, both qualify for autofuel STCs, but the Tiger didn't perform well enough in the fuel flow tests (180 hp = higher flow requirement) to pass them without modification. The market for the mod is fairly small, so the auto fuel STC was not pursued for that engine/airframe combination. John Galban=====N4BQ (PA28-180) |
#12
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It's the airframe under
discussion that lacks an STC. How does the fuel know what airframe its engine is attached to? Jose -- Money: What you need when you run out of brains. for Email, make the obvious change in the address. |
#13
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Well, I have the MOGAS STC on my PA28-180. I had the engine rebuilt by
PenYan Aero and they will dishonor the warranty if MOGAS is used (per the paperwork with my engine). In talking with a few A&P/IA types, I found that 100LL contains more TEL (Tetra Ethyl Lead) than I thought. And they tell me that this TEL lubricates the valves. Meanwhile I wrote PennYan Aero and asked the specific issues with MOGAS, they've never replied (been over 2 months now). Later, Steve.T PP ASEL/Instrument |
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