Today's Message Index:
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1. 09:20 AM - Re: Engines-List Digest: 1 Msgs - 05/15/09 (Stu Brown)
2. 09:32 AM - Re: Re: Engines-List Digest: 1 Msgs - 05/15/09 (Ken)
Message 1
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| Subject: | Re: Engines-List Digest: 1 Msgs - 05/15/09 |
Drawing a comparison between an automobile and aircraft engines based
upon compression can get you into trouble. Temperatures vary greatly in
the AC engine and the ignition timing is fixed. Automobile engines use a
timing curve based upon rpm, load, temp. etc. Ain't technology great?
Stu Brown
Engines-List Digest Server wrote:
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> Total Messages Posted Fri 05/15/09: 1
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> Today's Message Index:
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> 1. 06:58 AM - Re: Auto Engine - compression ratio vs. octane (Noel)
>
>
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> ________________________________ Message 1 _____________________________________
>
>
> Time: 06:58:01 AM PST US
> From: "Noel" <noelloveys@yahoo.ca>
> Subject: RE: Engines-List: Auto Engine - compression ratio vs. octane
>
>
> I had a friend who regularly ran his 426 Hemi Charger on high octane Avgas
> before the advent of 100 LL.
>
> Noel
>
> -----Original Message-----
> From: owner-engines-list-server@matronics.com
> [mailto:owner-engines-list-server@matronics.com] On Behalf Of DEAN
> PSIROPOULOS
> Sent: 15 May 2009 01:14 AM
> Subject: RE: Engines-List: Auto Engine - compression ratio vs. octane
>
> <dean.psiropoulos@verizon.net>
>
>
> The big automotive engines of the 1960s took compression ratios to their
> ultimate state of the art with premium leaded auto gas. Ratios from 10.5 to
> 11.5 to 1 were common place with 100 octane auto fuel. Since the unleaded
> mandate, computer analysis has advanced the state of the art in combustion
> chamber technology so that 9.5 to 1 ratios are possible on regular unleaded
> fuel (87 octane) without detonation. If you use computerized engine control
> with knock sensing you could probably go even higher. And with avgas being
> the equivalent of somewhere around 110 octane autofuel, the sky should be
> the limit (not quite but it would be an interesting exercise to see how high
> one could go using a modern auto engine with avgas).
>
> Dean Psiropoulos
> RV-6A N197DM
> Struggling with erratic idle on 0-360
>
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: Engines-List Digest: 1 Msgs - 05/15/09 |
And also a huge difference in volumetric efficiency.
Ken
Stu Brown wrote:
>
>
>
> Drawing a comparison between an automobile and aircraft engines based
> upon compression can get you into trouble. Temperatures vary greatly in
> the AC engine and the ignition timing is fixed. Automobile engines use a
> timing curve based upon rpm, load, temp. etc. Ain't technology great?
>
> Stu Brown
>
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