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Power valve 

 

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 Post subject: Power valve
Posted: Mon Jun 13, 2011 11:37 am 
Oompa Loompa
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Age: 51

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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Anyone know where I can find a 25mm power valve for the vapour line. I'm feeding a 425 on a 351C, a little thursty. 8-)
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 Post subject: Re: Power valve
Posted: Tue Jun 14, 2011 10:52 pm 
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did you, or are u wanting to fit and auxillary power valve to it?
425 mixers have the power valve in the mixer itself, its the one in the middle fyi. idle mixture is adjusted from the screw on the sideplate. set it them both around 1.5% CO on gas analyiser.
idle mixture at idle and power mixture at around 2-2500 rpm in neutral.
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 Post subject: Re: Power valve
Posted: Wed Jun 15, 2011 12:17 pm 
Oompa Loompa
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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Auxilury or extra power valve, I was going to fit one in the vapour line to reduce the gas flow. lucky to get 200KM from 95LT :(
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 Post subject: Re: Power valve
Posted: Wed Jun 15, 2011 8:59 pm 
Getting Side Ways
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You don't think you are going about this all wrong?

 

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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 12:04 pm 
Oompa Loompa
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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Not sure what you mean, just trying to address excessive gas consumption.
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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 1:22 pm 
Getting Side Ways
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Have you thought about adding a O2 sensor and a fuel processor to tame that consumption?
If not might pay to visit an LPG installer and enquire.

 

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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 2:45 pm 
Oompa Loompa
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Age: 51

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Joined: 16th Sep 2009

Ride: Ford maverick 351

Location: Katherine
NT, Australia

Live in the middle of NT, very hard to find specialist advice, especially gas tuning.
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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 2:59 pm 
Getting Side Ways
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How come it says newcastle,nsw for your location

 

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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 3:05 pm 
Oompa Loompa
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Age: 51

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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Need to update
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 Post subject: Re: Power valve
Posted: Thu Jun 16, 2011 9:17 pm 
Getting Side Ways
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myblacktruck wrote:
Not sure what you mean, just trying to address excessive gas consumption.



Limiting peak gas flow into the engine isn't going to help. All that will do is cause a lean condition at high throttle openings.

Poor consumption on is going to be from over rich mixtures at cruise and light to medium acceleration (if mixture strength is even to blame)

The 425 mixer has an adjustment for peak gas flow already and is more then capable of the job.

First things to do is basic tune up items, Good plugs and leads, valve clearances, air filter, making sure there are no vacuum leaks. Make sure the vacuum advance hose from the dizzy IS NOT connected directly to a manifold vacuum source It is meant to be to a ported vacuum source ABOVE the throttle plates.
Have the right ignition advance. make sure you have good strong spark.
Make sure you don't have excessive exhaust back pressure.

Then check your A/F ratios across the engines entire operating range.

 

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 Post subject: Re: Power valve
Posted: Fri Jun 17, 2011 2:28 pm 
Oompa Loompa
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Age: 51

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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Ok,

Tune is fine, running an Ice ignition extended spark duration, point to add is there is no Vac advance on this distributor,

Timing = 12deg static-----all in 26deg

AFR
idle - 13.1
cruise - 14.5
WOT - 13.5

Are we maybe looking at spring length or varing spring pressures
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 Post subject: Re: Power valve
Posted: Fri Jun 17, 2011 8:43 pm 
Getting Side Ways
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It's too rich across the board. Your not tuning petrol. Stoich for Auto LPG is about 15.7:1 Depending on the ratio of propane to butane, but it doesn't change more then 0.2 from straight propane to straight butane.
If you can use an A/F meter that can display LPG on the lambda scale, then tune for lambda 1 at idle and cruise and lambda .93 - .90 for WOT, once you that you can fine tune WOT AFs on a dyno.

12 initial is not enough, it should be up around 16 or so to start with. 26 total is ok. but if you have to go to 30 total to get enough initial that would be ok.

 

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 Post subject: Re: Power valve
Posted: Fri Jun 17, 2011 10:03 pm 
Oompa Loompa
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Age: 51

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Ride: Ford maverick 351

Location: Katherine
NT, Australia

Thanks for the pointers, but not sure how to adjust AFR for cruise, isn't this controlled via the contour of the gas valve.
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 Post subject: Re: Power valve
Posted: Fri Jun 17, 2011 10:33 pm 
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there is more then one gas valve available.

 

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 Post subject: Re: Power valve
Posted: Fri Jun 17, 2011 10:37 pm 
Oompa Loompa
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Age: 51

Posts: 32

Joined: 16th Sep 2009

Ride: Ford maverick 351

Location: Katherine
NT, Australia

Ah, I see, currently running a 19 gas valve, can the different gas valves be bought seperate, maybe to lean out a little.
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