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gas ring mod? 

 

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 Post subject: gas ring mod?
Posted: Thu Sep 09, 2010 10:25 pm 
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hi
has anyone thought or tried to mod a gas ring to flow more air? i was thinking of trying to put it in a lathe and machining out the size of the centre hole to flow more? i know this will upset the air/gas ratio but will it enough that the computer wont sort it out over a short time?

has anyone already tried this or something along those lines or something different to improve flow?
i just thought it would be a easy way to get a bit more out of it

ideas?????

thanx
STADIC
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 12:51 am 
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No, it won't work. The converter relies on the restriction of the venturi mixer for correct metering of the gas.

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 12:53 am 
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PoweredByCNG wrote:
No, it won't work. The converter relies on the restriction of the venturi mixer for correct metering of the gas.


It would be a better venture to design a new mixer ring that creates less restriction, yet still creates the pressure drop required to draw the LPG in at the correct mixture. Ie, like a stream mixer, but large enough for a falcon.

Or just swap your setup for a gas research setup.

Cheers

ToranaGuy

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 1:37 pm 
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i was about to post a question about the same thing. i always thought the mixer looked restricted and thought about grinding it out. so this mean ( sorry im not compleatly up to speed with lpg) any sort of air flow mod done to the air intake i.e. diffrent intake manifold, bigger throtle body, pipeing, better filtter make no diff at all? intake mod's like this are obviosly work great for petrol but is there any point spending the cash making it flow better on duel fuel 5ltr's?
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 1:42 pm 
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japcrp wrote:
so this mean ( sorry im not compleatly up to speed with lpg) any sort of air flow mod done to the air intake i.e. diffrent intake manifold, bigger throtle body, pipeing, better filtter make no diff at all?


Correct. That's why injected LPG systems are far superior.

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 3:43 pm 
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i found a larger mixer ring at the wreckers and put it in, car runs nicer with a bit more guts, the venturi was only 4mm bigger overall inside diameter, gave it a quick tune and only cost me $5
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 6:20 pm 
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What about putting a bevel on the incoming side to funnel the air better?

What was the bigger ring off? i was thinking of using a straight gas TB to improve it?

This hole idea is to do it for the lowest $$$ so everyone can use the same idea so no more post about "just swap your setup for a gas research setup" because thats the idea i am going for

thanx
STADIC
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:04 pm 
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Funneling the air better won't do too much. The reason why they have such a small hole is to create a pressure drop. If you make the gas hole too big as a percentage of the total intake size, you don't get much pressure drop, and poor fuel flow/mixing.

Cheers

ToranaGuy

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:27 pm 
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the e-gas throttle body is the best idea, re:pressure drop, if you dont wanna do injection, injection is def worth the cost in the long rn look into it inregaurds to econemy and power gains and do the sums! good luck with it hope it turns out well!!!! ps good liqid injection systems provide 30% power increase on average above 91r0n unleded but it has to be duel fuel because the prime time excedes that of 3 seconds (somewere around there) to start the vehichle which is the legal requirment.
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:28 pm 
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fairmont54 wrote:
the e-gas throttle body is the best idea, re:pressure drop


Comparing the size of them to a Gas Research TB, i don't see how you get that conclusion?

Cheers

ToranaGuy

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:36 pm 
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or the gas reasherch depens on the money you wanna spend if you wanna use cheap parts i sell the e gas trottle bodys for 100 bucks to the cabbies so tat tells ya you can pick em up at the wreking yards cheap but def gas reasherch or liquid injection is the way to go just thought it was suposed to be as cheap as posible
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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:40 pm 
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fairmont54 wrote:
or the gas reasherch depens on the money you wanna spend if you wanna use cheap parts i sell the e gas trottle bodys for 100 bucks to the cabbies so tat tells ya you can pick em up at the wreking yards cheap but def gas reasherch or liquid injection is the way to go just thought it was suposed to be as cheap as posible


The straight gas TB is neater than a mixer ring in a chopped intake tube, but is it really any better overall in power?

I've had mixer ring carby car's, never going to have one of them again! I have also had impco 425 carby car's, which run pretty good overall, no worse than petrol carby lol. I also have Injection (vapor) on my Eb Ghia, a big step forward! I have a Xr8 with a dual fuel impco 425 setup and that's pretty good but not quite as good as if it was injected gas or a straight gas setup.

Cheers

ToranaGuy

 

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 Post subject: Re: gas ring mod?
Posted: Fri Sep 10, 2010 11:52 pm 
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ToranaGuy wrote:
fairmont54 wrote:
or the gas reasherch depens on the money you wanna spend if you wanna use cheap parts i sell the e gas trottle bodys for 100 bucks to the cabbies so tat tells ya you can pick em up at the wreking yards cheap but def gas reasherch or liquid injection is the way to go just thought it was suposed to be as cheap as posible


The straight gas TB is neater than a mixer ring in a chopped intake tube, but is it really any better overall in power?


it ensures no air leaks from doddgy chop-ins thts all and we dont want any air leaks over a 100 or less dollars now do we?
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 Post subject: Re: gas ring mod?
Posted: Sat Sep 11, 2010 1:04 pm 
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ToranaGuy wrote:
I've had mixer ring carby car's, never going to have one of them again! I have also had impco 425 carby car's, which run pretty good overall, no worse than petrol carby lol. I also have Injection (vapor) on my Eb Ghia, a big step forward! I have a Xr8 with a dual fuel impco 425 setup and that's pretty good but not quite as good as if it was injected gas or a straight gas setup.

Cheers

ToranaGuy

did u put the vapor system on or was it on the car when u bought it? tryin to work out if its worth upgrading
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 Post subject: Re: gas ring mod?
Posted: Sat Sep 11, 2010 1:58 pm 
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well im gonna put it out there and say it will work.
i changed my gas ring from a 42mm ID to a 45mm ID.
the car now revs harder, and fuel economy, although being reported to be worse via trip computer, doesnt appear to be any worse. still getting 500kms from 65-70ltrs of gas. mostly hiway driving though.

see if you can find another gas ring, machine one out, if you're not happy with results, put original one back on.
no harm in trying.

i had to modify a spare throttle body to fit an Amos ring from an XF T/B.
i know theres better options out there for more power, but this cost me nothing, so i dont care.
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