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How to tune gas?

General Tech Talk

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How to tune gas?

Post by mudmacaca »

I have a 2f dual fuel and the gas runs through a butterfly after the air box.
Before the butterfly there is a lockable scrwe that regulates the amount of gas going to the butterfly.

How do i get the right amount of gas going through? If i turn the screw to far i can get idle but when I put the boot down she stalls.
Do i just increase it till she works or is there a better science to it?

I want to get it right to much to little she will cook
If you dont have panel damage you ain't trying hard enough
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Post by RaginRover »

what sort of converter do you have ?

Normally the inline valve sets the amount of gas delivered under acceleration and there is a different adjustment on the converter for the idle.

I normally set the power valve first then set the idle so it doesn't stall. Of course after that you need to go for a drive and fine tune.

Tom
"It was just an ordinary day, and you saw them. There were guys in their Porsches, "Look at me in my Porsche, ha ha!" and they were overtaken by a van. Driven by a girl!"
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Post by bluemq »

get a vaccum gauge, stick it on the intake in the engine bay so you can read it

use the hand throttle (or a mate) to get RPM up to like 3500rpm (dont think the 2f revs any higher does it) ??

when its warm watch the guage and adjust the screw on the mixer til its max vacuum

theres a screw that adjusts the idle flow

thats how i have always done it and it works well
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Post by mudmacaca »

Cheers.
the converter type I dont know but has water running to it I guess to turn the gas from a liquid to a gas there is a solenoid that has a little bit of metal with a + and a - on it.

The vacum gauge goes anywhere it will fit?
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JWB
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Post by JWB »

[quote="mudmacaca"]Cheers.
the converter type I dont know but has water running to it I guess to turn the gas from a liquid to a gas there is a solenoid that has a little bit of metal with a + and a - on it.


The water is for heating! as you need heat in there to control the temperature drop that occurs when liquid turns to gas ;)
The solenoid would allow gas throw only when motor is running ie spark pulsing!
JB
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Post by shakes »

The water is for heating! as you need heat in there to control the temperature drop that occurs when liquid turns to gas
isnt the water there to help the liquid turn to gas? as the heat energy for it to change state has to come from somewhere?

ie. to stop it taking the heat from the surrounding air and therefore freezing the mixer and the liquid....this is coming from my understanding of air con not cars so please shoot me down if i'm wrong!

Simon
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Post by mudmacaca »

shakes wrote:
The water is for heating! as you need heat in there to control the temperature drop that occurs when liquid turns to gas
isnt the water there to help the liquid turn to gas? as the heat energy for it to change state has to come from somewhere?

ie. to stop it taking the heat from the surrounding air and therefore freezing the mixer and the liquid....this is coming from my understanding of air con not cars so please shoot me down if i'm wrong!

Simon
Yes but do you know how to tune a gas engine.

And you just repeated what JWB stated
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Post by shakes »

sorry i read his description wrong, and not really... I get it running smooth with no flatspots by ear and then pay someone to do it as i dont have the gear or know how yet :?
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Post by Gribble »

The water is there to stop the primary valve in the converter freezing when you put the foot down. The primary valve would be something similar to the thermal expansion valve in an aircon system.

What converter/mixer setup are you running? That will make things alot easeir.
\m/
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Post by mudmacaca »

The mixer is by AIRROD and joins into the air intake
The converter is is by ONVL and it is a R90/E
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