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LPG GAS LINE SIZE 

 

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 Post subject: LPG GAS LINE SIZE
Posted: Wed Aug 26, 2009 10:01 pm 
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Hi Everyone, is there a general rule to use when choosing what sizeLPG line to use? I am about to go gas on my Windsor 302 which is stock, around 300hp, but will be modified later to about 450hp. What size line would I need. Is 5/16 enough? or 3/8 ? AND, what about the tank, how much hp will a standard tank support? do I need a twin outlet tank? Any advice appreciated...I don't want to have to change things later seeing I am buying it all new right now.
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 Post subject: Re: LPG GAS LINE SIZE
Posted: Thu Aug 27, 2009 5:00 pm 
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I can only comment on my LPG Injection system in my EB, which is a EasyJet system.

The manual states either a 6mm or 8mm line, depending on power requirements, suggestion is 8mm line (i believe that's ID btw) for engines above 160kw iirc. I'd have to check the manual to be sure.

The limit on power i believe isn't so much limited to "line flow" but the actual lock off at the tank.

I've heard of 4 hole apa tanks having the fill bit changed to a multi valve so you get 2 outputs with 2 lock off's for more fuel flow, but i dunno how legal that would be.

Cheers

ToranaGuy

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Mon Oct 05, 2009 12:58 pm 
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347stroker wrote:
Hi Everyone, is there a general rule to use when choosing what sizeLPG line to use? I am about to go gas on my Windsor 302 which is stock, around 300hp, but will be modified later to about 450hp. What size line would I need. Is 5/16 enough? or 3/8 ? AND, what about the tank, how much hp will a standard tank support? do I need a twin outlet tank? Any advice appreciated...I don't want to have to change things later seeing I am buying it all new right now.


8mm, 5/16 will be plenty if you only after 450hp, use cng fittings as there already larger in i/d just depends on your convertors & mixter ?? & if your going positive (AIROD,LANDI,TECHICARB) OR negative (GRA,IMPCO,OHC) remember 1 ltr of liquid expands 250 ltrs of vapour....a pic of my last gas install

cheers

Joe

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Mon Oct 05, 2009 1:45 pm 
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i'd use 3/8 flexi line

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Mon Oct 05, 2009 10:03 pm 
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Thats a nice install joe

Havent seen a GAS carb like that before, how does it go???

 

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Last edited by MICKYYYY on Wed Oct 07, 2009 6:32 pm, edited 1 time in total.

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Tue Oct 06, 2009 11:19 am 
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Beautiful installation Joe, thanks for the pic. I used 3/8 flex in the end, just to be sure and to allow for future upgrades
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 Post subject: Re: LPG GAS LINE SIZE
Posted: Wed Oct 07, 2009 4:09 pm 
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That install is very tidy, looks like it might be a Torana LH-UC engine bay. Is it?

347stroker, you say you used 3/8 flex line? What car/ute/truck is the 302 windsor in?

Cheers

ToranaGuy

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Wed Oct 07, 2009 4:31 pm 
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It's in an XD panel Van very modified for braking and handling
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 Post subject: Re: LPG GAS LINE SIZE
Posted: Thu Oct 08, 2009 4:28 pm 
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347stroker wrote:
It's in an XD panel Van very modified for braking and handling


Interesting. I thought the flex line was only used in vehicles that had a separate chassis? Like my Hz Panel Van?

Cheers

ToranaGuy

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Fri Oct 09, 2009 8:04 am 
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I've got Flexi line in my EF.

Rmyers EA has twin flex lines.

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Sat Mar 20, 2010 12:37 pm 
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AUXR8 2 wrote:
347stroker wrote:
Hi Everyone, is there a general rule to use when choosing what sizeLPG line to use? I am about to go gas on my Windsor 302 which is stock, around 300hp, but will be modified later to about 450hp. What size line would I need. Is 5/16 enough? or 3/8 ? AND, what about the tank, how much hp will a standard tank support? do I need a twin outlet tank? Any advice appreciated...I don't want to have to change things later seeing I am buying it all new right now.


8mm, 5/16 will be plenty if you only after 450hp, use cng fittings as there already larger in i/d just depends on your convertors & mixter ?? & if your going positive (AIROD,LANDI,TECHICARB) OR negative (GRA,IMPCO,OHC) remember 1 ltr of liquid expands 250 ltrs of vapour....a pic of my last gas install

cheers

Joe


That Torana is a very clean unit ... and hell it sounds tough.

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Sun Mar 21, 2010 7:45 pm 
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yeh..... the torana goes hard I built the engine years ago, to a 355 heaps of torque, I have a XD ute atm with a XH front with a 351 in her I've converted her from a duel impco 300a to a Technocarb basicly a stock motor with a big cam, pulled 298 rwhp, pulling the engine out & going for more aiming for around 350rwhp +

IMO for a straight gas set up on a V8 its the best.
One Techocarb is the same as...... 2x GRA or 2x OHG's or 2x impco's
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 Post subject: Re: LPG GAS LINE SIZE
Posted: Sun Mar 21, 2010 9:41 pm 
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Why is the techno carb 2 x GRA's? How does it work?

Cheers

ToranaGuy

 

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 Post subject: Re: LPG GAS LINE SIZE
Posted: Sun Mar 21, 2010 10:39 pm 
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jeeezz I hate this internet I've just finish typing up a reply & its f**k loged me out..... try again

basicly they have a holley style base plate with the same butterflys size as a 600-720 or 750cfm cannt remember which of the two, & with the right venturi size can flow up to 720/750cfm
So why do I need to run two GRA's OHG's or impco's that all only flow aproxx 420-450cfm each when I can make more power with one techocarb.....

A mechanic that I know who is very good with OHG's set up an XB with a stout motor now this engine with a carbi on petrol will easy make 400rwhp!! he had 2 xOHG with modified neg feed convertors & made 340rwhp which is pretty good for gas......I on the other hand have a std rebuilt 351 with only a bigg cam made 298rwhp with one techocarb & 2x std Airod super plus convertors the same ones that I would use on a Ford 4.0ltr install & still had plenty left in them, I've being using technocarb's for 5-6 years now & love them

check out the site
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 Post subject: Re: LPG GAS LINE SIZE
Posted: Sun Mar 21, 2010 10:47 pm 
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With the holley base plate, i can understand how it works with only 1 carb. Thanks for the reply dude, greatly appreciated. If i keep my Xr8 i might need to swap the impco 425 for a technocarb down the track, as i'll be chasing more power than it currently has.

Cheers

ToranaGuy

 

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