safe A\F ratio in a stock block st185

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safe A\F ratio in a stock block st185

Postby sleeper » Sat Sep 25, 2004 6:52 pm

Just bought a autronic to my st165 (st185 motor)
and was woundering what`s a/f ratio is it safe to tune the engine to??
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Postby furpo » Sun Sep 26, 2004 1:52 am

it depends on alot of things. fuel type, boost, ignition advance to name a few. listen for knock and tune it properly. if not can i have your autronic when you melt a piston?

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Postby alltracman78 » Sun Sep 26, 2004 2:23 am

furpo wrote: if not can i have your autronic when you melt a piston?


:rofl:
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Postby Zeus » Sun Sep 26, 2004 5:55 am

11.8 is what i tune to... its regarded as "safe"

what are you using to tune? do you have an analyzer?
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Postby sleeper » Sun Sep 26, 2004 7:53 am

Im running 98 octane fuel, 21psi boost, have analyzer.......
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Postby Zeus » Sun Sep 26, 2004 5:09 pm

which analyzer are you using the a or the b?

also where are you to get your 98 octane? north american 94 is actually better than european 98 cause they rate them differently
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Postby sleeper » Sun Sep 26, 2004 7:49 pm

Analyzer a or b???

i get it in norway.....
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Postby Zeus » Sun Sep 26, 2004 10:00 pm

the autronic analyzers

there is an a or a b
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Postby OlyST185 » Mon Sep 27, 2004 4:24 am

there is an a or a b


This is getting confusing :doh:
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Postby sleeper » Mon Sep 27, 2004 10:54 am

it`s not the autronic analyzer... it`s inovate or something...
but what`s the differense in a or b???
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Postby beej » Mon Sep 27, 2004 12:44 pm

Zeus wrote:which analyzer are you using the a or the b?

also where are you to get your 98 octane? north american 94 is actually better than european 98 cause they rate them differently


yer they use RON like us aussies, and ur only just rite, the difference between the two would be negligible. They're practically the same, the only winner is japan that gets 100RON at the pumps. ;)

RON, MON and AKI. MGB's with high compression engines were listed as requiring Premium 98 octane fuel or above. However, this cannot be directly compared with the octane number found on the pumps in North America, which is rated differently. In Britain, the Research Octane Number (RON) is used to indicate a fuel's octane. This number is derived from tests on an engine running at a constant speed of 1500 r.p.m., conditions that do not closely relate to those found in real situations. In order to address this disconnect with reality, the Motor Octane Number (MON) system was developed using a tougher test carried out at higher engine speed and temperature. In the US and Canada the two systems coexisted for a while -- causing much confusion. To resolve the matter the U.S. Cost of Living Council (CLC) index, better known as. Anti-Knock Index (AKI), was introduced and is simply the arithmetical average of RON and MON; so AKI = (RON + MON)/2 and is the number now familiar to motorists in the USA and Canada. Yet another measure may sometimes be referenced: Road Octane Number (RdON).This is considered the best predictor of octane but it is determined by running a vehicle on the road or using a chassis dynamometer, and it is too dependent on the actual engine under test. RdON is so close to AKI that they are often used interchangeably. There is no direct correlation between RON and MON, different formulations for fuels with the same RON number might well produce different MON's. You can make a rough determination, however: for the high octane fuels we are concerned with, the difference between RON and MON, or the "sensitivity" as it is known, is about 10. If you know the AKI therefore you can add or subtract 5 to determine the approximate RON or MON respectively.

Taking Shell as an Example. In the USA Shell 93 (AKI) octane FormulaShell Premium is about the best found at the pump and is 98 RON. In Canada, Formula Shell Gold: 91 (AKI) is actually 95 RON, so Canadian "B" owners with vehicles requiring 98 RON could well need to address a knock problem.


taken from http://www.mgcars.org.uk/electrical/body_fuel.html
"ITS A VENT GODDAMIT NOT A F#$KING SCOOP!!!!!"
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