At 08:59 AM 4/01/02 +1030, you wrote:
>Yep, that's an interesting issue, and I appreciate you reminding me
>about it, Leigh.
>
>I have been pondering a variation of the same question for a while now.
>
>That variation is what I run my Motorfalke on. Its engine is happy on
>either 'Super' petrol or AVGAS (it definitely likes AVGAS better :) ).
>
>In the last few months I've been running it on 'Super Equivalent'
>(since that's what started coming out of the petrol bowsers quite a
>while back...). It seems ok on it, but I'm not aware of any clear
>statements on whether this is formally 'kosher' with aviation engines
>that list 'leaded petrol' as an ok fuel, or not.
>
>Anyone know?
>
>Simon
CASA issued a warning about using LRP(lead replacement petrol) a while
back. It seems that it can precipitate a fine powder which can block
filters etc. It is NOT approved for use with aircraft having a mogas STC
for super.
I used to use super/Amsoil two stroke mix in the Ventus TOP. I tried Avgas
but lose about 100rpm. Talking with the owner of a Ventus CM the Hirth
engine in that suffered a similar or greater loss of performance. It seems
that the higher octane avgas burns slower so effectively retarding the
timing leading to the loss of performance. Running on a mixture of about
20% 100LL avgas and the rest unleaded has restored the performance in both
cases.
As for running Lycomings etc on unleaded I believe Bathurst used to run
their Pawnee on it. Maybe still do. Anyone know?
Low compression engines should be OK on it I believe. The US has approved
an 82 UL standard which is basically US unleaded auto fuel but the auto
fuel has a slightly tighter spec in a couple of areas. It is OK to use on
aircraft which had an auto fuel STC. Unleaded is my fuel of choice for the
BD4(Lycoming O-320A2B 7:1 compression ratio) when leaded fuel becomes
unavailable. It will sure stop the plug fouling we get on 100LL - bottom
plugs only since we installed an electronic ignition running automotive
plugs in the tops. Highly recommended but can only be installed on
homebulit experimentals.
Mike Borgelt
Borgelt Instruments - manufacturers of quality soaring instruments
ABN 75532924542
Box 7474 Toowoomba M.C.
Queensland 4352
Australia
Tel 0746 355 784
mob 0428 355 784
0429 355 784
fax 0746 358 796
International
phone: int'l+ 61 7 46 355 784
Cellphone:int'l +61 4 28 355 784
int'l +61 4 29 355 784
fax : int'l+ 61 7 46 358 796
email: [EMAIL PROTECTED]
website:www.ozemail.com.au/~mborgelt
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