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Removing LPG restrictions/forced induction with LPG? 

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sun May 09, 2010 10:05 pm 
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fairlane6970 wrote:
Yeah why not, sounds easy enough (to me not that i know anything) as long as you can get enough gas i suppose, y piece from throttle body twin gas rings then back to single or airbox with twin outlets :?: That way you can have two restricted inlets at 35 -40mm = 70-80mm! :D



2 x 35mm gas rings has the same area as one 50mm gas ring.


but with out if you make them too big the system wont work for the same reason you couldn't a 1050 carby on a 2L engine. there wouldn't be a strong enough signal to draw the fuel/gas

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 10, 2010 1:15 am 
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Can you get a 50mm gas ring to suit our falcons?

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 10, 2010 4:36 pm 
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Have tried larger mixers , car wasn't the same, flat spot , chewing through fuel , idling issues, car would stall on the freeway as you decelerate.
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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 10, 2010 11:49 pm 
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I thought twin 35mm intakes was equivalent to a 52.5mm single. My maths must be bodgy or something.

And yeah it won't work because the fuel is introduced at the mixer, just like a carby. You need a decent vacuum. Maybe on a 351 or larger engine with mild or stock cam the twin 35's might work but not on a 4.0 or smaller engine.
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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sat May 22, 2010 2:05 pm 
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xcabbi wrote:
I thought twin 35mm intakes was equivalent to a 52.5mm single. My maths must be bodgy or something.

And yeah it won't work because the fuel is introduced at the mixer, just like a carby. You need a decent vacuum. Maybe on a 351 or larger engine with mild or stock cam the twin 35's might work but not on a 4.0 or smaller engine.



I just plugged some numbers into an online calculator for area of a circle. All i really wanted to do was show that two 2 x 35mm wasn't the same as 1 x 70mm


It may work with a staged system with duel throttle bodies, but ideally it would need to operate with a vacuum secondary throttle not a mechanical one. complex and a pain to get working right but it could be done.

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sat May 22, 2010 7:03 pm 
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I just found one of these for about $50 it's 65mm internal, so I'll give it a go and see what happens, I'll keep you posted :D

Attachment:
streammixer2.jpg


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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sun May 23, 2010 11:25 am 
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fairlane6970 wrote:
I just found one of these for about $50 it's 65mm internal, so I'll give it a go and see what happens, I'll keep you posted :D

Attachment:
streammixer2.jpg




I don't like the look of that one. It might be 65mm but its got alot of area blocked off, those protrusions will also cause a lot of turbulence which will decrease flow. Try and find one that looks like a venturi, not a sharp edge orifice.

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sun May 23, 2010 1:30 pm 
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What they could of done was create a rounded leading and sharp tailing edge.

might be able to trim some of that plastic off I reckon.

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sun May 23, 2010 10:44 pm 
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what they should do is stop trying to reinvent the wheel.

Venturi have been working in carburetors for a hundred years or so. There is no better way of doing it.

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Sun May 23, 2010 11:00 pm 
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Funnily enough my EFI Fairlane doesn't have a carby, so I guess I'll have to try this "crappy" thing :roll: instead of sitting back complaining about everything! :roll:

p.s. I have the flu combined with toothache so pardon my not so friendly mood - at least I'm trying something - yes?

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 24, 2010 2:09 am 
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Don't know if we're in the same page as d**k but this is what I mean about trimming the bulk of the plastic off. basically it's a venturi :lol:
$50 bucks for a 65mm ring you can play around with if you wanna be a real innovator! :P
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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 24, 2010 8:42 am 
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yeah Slick you dont get gold for $50 but I'll give it a go and see what i can do once i get it, and look at tidying it up if needed, of course the variable venturi ones mentioned elsewhere would be ideal, but, seeing you can no longer get them we have to try what is available, still interested in those Blos variable ones available on ebay they are supposed to open up to almost70mm when required, but like this one they come from Poland so who knows what they're like eh?

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 24, 2010 8:58 am 
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these ones :?:
http://cgi.ebay.com.au/BRC-BLOS-LPG-PRO ... 335d5fb76c

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 24, 2010 9:23 am 
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fairlane6970 wrote:

Wow, very interesting, can anyone shed some light on these? I've sent the link to some of my more knowledgeable mates, pending their approval I'll buy one of these and try it out...

 

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 Post subject: Re: Removing LPG restrictions/forced induction with LPG?
Posted: Mon May 24, 2010 9:28 am 
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mmmm I like the bit where they say you can run two for performance apps if req. :D

 

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