Which LPG system?

Submitted: Wednesday, Oct 26, 2005 at 13:25
ThreadID: 27580 Views:7002 Replies:8 FollowUps:6
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Can anyone exlpain the fundamental difference between an IMPCO & a PARNELL gas set-up please.
I want to fit a system to my 94 80 series LC (with snorkel),but am a little confused as to which would suit better.
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Reply By: Bonz (Vic) - Wednesday, Oct 26, 2005 at 13:53

Wednesday, Oct 26, 2005 at 13:53
IMPCO Great, PARNELL Good

Impco are the best IMHO, dont knw the specifics, but if I was gassy I would be IMPCO gassy
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Follow Up By: Diamond (Vic) - Wednesday, Oct 26, 2005 at 17:39

Wednesday, Oct 26, 2005 at 17:39
if your not gassy rofl.
people often say why do you call him sir- bonz- alot.
when infact in should be sir- gas- alot.
cheers oh gasiest one
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Follow Up By: Member - 'Lucy' - Thursday, Oct 27, 2005 at 00:39

Thursday, Oct 27, 2005 at 00:39
Spot on Diamond.

Never a more profound word spoken.

He is no doubt speaking from module he took at the Terang College of Everything and Anything which he dux'd in 1909. Must have been about then because he couldn't be such an expert on everything otherwise. (ROFLMAO)

Ooooo! Bonz-a-reli you make my day evry day.
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Follow Up By: Bonz (Vic) - Thursday, Oct 27, 2005 at 08:39

Thursday, Oct 27, 2005 at 08:39
hahahaha dont forget I know where you two blokes live hahahahah
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Reply By: techie - Wednesday, Oct 26, 2005 at 15:29

Wednesday, Oct 26, 2005 at 15:29
to my knowledge (I have impco system)
Impco uses simple mixer - similar to sidedraft su as used in mini's.
Parnell mixer is like a weber carby. complicated but with more adjustments.
I chose impco as components for mixer are available($100) as opposed to new unit($260).
For more info contact lynahan at lpgAust in Sydney.
He explained just about everything I needed to know.
Techie.

AnswerID: 136478

Reply By: Brew69(SA) - Wednesday, Oct 26, 2005 at 21:17

Wednesday, Oct 26, 2005 at 21:17
Not sure of diff but Impco for me.
AnswerID: 136527

Reply By: gqpat - Wednesday, Oct 26, 2005 at 22:50

Wednesday, Oct 26, 2005 at 22:50
Just to clear up a few things a parnell system uses whats known as a simple mixer as it has no moving parts and a fixed size venturi or hole to put it simply .Am Impco system uses a complex mixer as it has a variable venturi the main and biggest advantage with the impco system is that at low engine speed you have a small' hole' which creates more vacuum for the gas to be drawn in thus dramatically increaseing throttle responce and as engine speed increases the hole also increases providing a large hole for high speed running it is generallya little bit harder to get mixtures spot on but once they are correct they almost never need touching again .
So go for the Impco system..
AnswerID: 136544

Reply By: MrBreeze - Thursday, Oct 27, 2005 at 06:19

Thursday, Oct 27, 2005 at 06:19
Thanks alot,you've all been very helpful.
It would appear that the Impco is the way to go.

Dean
AnswerID: 136559

Follow Up By: Member - Peter R (QLD) - Thursday, Oct 27, 2005 at 07:44

Thursday, Oct 27, 2005 at 07:44
Suggest you have it installed and serviced by an Impco expert, Queensland Manager is Warren Leighton Ph 0411475854, and he may be able to point you in the right direction in your area.

Pedro
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Reply By: MrBreeze - Thursday, Oct 27, 2005 at 08:39

Thursday, Oct 27, 2005 at 08:39
Thanks,once again Pedro for all your help.
Hope to return the favour someday.
Dean
AnswerID: 136574

Reply By: V8Diesel - Thursday, Oct 27, 2005 at 16:25

Thursday, Oct 27, 2005 at 16:25
I have the IMPCO on my 100.

No kidding, I can't tell what it's running on, it is that good. Idles smooth, no discernable difference in grunt, will easily rev to redline. Had a different setup on a previous 100, and it was rough as guts.

Everything just looks good with the IMPCO too, good fittings etc.

I rate them 10 out of 10.
AnswerID: 136651

Follow Up By: Mike-TS - Sunday, Oct 30, 2005 at 19:09

Sunday, Oct 30, 2005 at 19:09
Is your 100 a 4.5L straight?

If so how is the LPG tank fitted and what's the fuel economy like on LPG? I wouldn't mind it if they could keep both my tanks and the fuel economy difference was much better but I don't thnk that's the case.

Your experiences appreciated.
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Follow Up By: V8Diesel - Sunday, Oct 30, 2005 at 19:34

Sunday, Oct 30, 2005 at 19:34
Hi Mike-TS, my 100 is indeed the 1FZ-TE 4.5l, 24 valve, inline petrol six with the 5 speed manual.

My tank is fitted at the back, replacing the original sub-tank and spare tyre. It is approx 115l capacity and the filler is neatly concealed behind the factory fuel flap. This gives me 95l of PULP and 115l of LPG. 210l's of go-go juice in total....nice.

To acheive this, the spare needs to be relocated. I have a Kaymar bumper replacement bar with swing out wheel carrier, but there are a number of different options around to suit.

I also previously owned a 100 with the two cigar tanks mounted on the outside of both chassis rails. This setup was good and retained the two factory petrol tanks, but did have two drawbacks. One was the small LPG capacity (70l) and the other was reduced clearance for ramp over angles. I found myself driving a lot more tentatively off-road with this setup than the rear mount.

Fuel economy is soemthing I haven't worked out accurately yet. I have big boots on mine, so the figures will be out anyway. I'd say 18l/100km's on PULP and 26l/100lm's on LPG would be a reasonable estimate.

Talk to a few gas fitters about the 4.5's. They can have a tendency to burn valves if not maintained I've been led to believe, but regular valve clearance checks should go a long way to avoiding this. I also run a drip feed upper cylinder lubricant too (Moreys).

Don't know the exact figures as I said, but I can say my 100 costs peanuts to run now compared to other rigs I've owned. It is also a pleasure to drive.

Hope this helps.
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Reply By: Patroleum - Thursday, Oct 27, 2005 at 19:45

Thursday, Oct 27, 2005 at 19:45
Mr Breeze,

I just got my 94 80 Series back yesterday from LPG fitter. I had a Torquegas system fitted and today was the first driving i've done on the new LPG system.
Must say, I'm impressed. Would be 10% power loss but is much smoother to drive on gas and generally nicer to drive. Cost me $2500 Fitted. put tank in back of wagon for off road clearance reasons and touring range . 230L of fuel in total, gas and both petrol tanks.

Regards

Greg
AnswerID: 136679

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