Lotus Elan

Air Fuel Ratio

PostPost by: Tonyw » Thu Mar 31, 2011 2:20 pm

Hi all,

Just wondering if any of you have used a Gunson Gas Tester to check your fuel ratio? I note that some of you have used Gunson's colour tune.

I have a couple of NOS Strombergs which have the mixture adjustment screws at the bottom of the carb float bowl and I am keen to get the fuel mixture right, I know I can set them by leaning of until the revs drop of then turn it to rich a little but I would really like to put a bit more science into this and also not have to keep taking out spark plugs to look at the colour. The Gunson gas tester do not seem to be that prohibitive cost wise anybody.......................

TIA
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PostPost by: john.p.clegg » Thu Mar 31, 2011 3:38 pm

Tony

...or even the infra red digital thermometer some of us have picked up recently?

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PostPost by: tdafforn » Thu Mar 31, 2011 5:09 pm

Hi
An AFR meter is a great tool. I have used the gunsen but one if the newer systems like the innovate system are much better. Colourtune is a bit of an art. I always found that I had to run with a yellow flame.
Infrared thermo helps with checking for a lazy cylinder.
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PostPost by: elansprint71 » Thu Mar 31, 2011 11:29 pm

Zetec? :twisted:
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PostPost by: john.p.clegg » Fri Apr 01, 2011 5:44 am

I find mine likes 13:1 (it definitely doesn't like 14.7:1)for tickover and am trying to wean it down to 16:1 for cruising...

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PostPost by: Tonyw » Fri Apr 01, 2011 6:24 am

John,

So how are you measuring your AF ratio??

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PostPost by: john.p.clegg » Fri Apr 01, 2011 8:42 am

Tony

Have EFI fitted controlled by Megasquirt,and a WBO2 lambda sensor just after the Y-piece.

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PostPost by: tdafforn » Mon Apr 04, 2011 12:03 pm

John,
What ignition timing did you settle on in the end?
Tim
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PostPost by: john.p.clegg » Mon Apr 04, 2011 3:05 pm

Tim

I have a map,Revs/Throttle......will try to lift it

John :wink:

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Lets try posting the file....the extension vex is not allowed??Try changing it...Bugger
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PostPost by: john.p.clegg » Mon Apr 04, 2011 3:08 pm

Tim

Even tried PM'ing you but vex is still not allowed...

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PostPost by: john.p.clegg » Mon Apr 04, 2011 3:13 pm

Sorry for diverting the thread...last try...Tim,it's here

http://www.msextra.com/forums/viewtopic ... 72&t=40035

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