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  #21  
Old 20-04-2017, 07:04 PM
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Yeah number 25 or 26
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  #22  
Old 20-04-2017, 07:09 PM
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Yeah number 25 or 26
How would you cut the shims out of paper(what shape)?
Do you cut the shim to match the gasket(same shape as 25 or 26)?

Thanx
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  #23  
Old 20-04-2017, 07:18 PM
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Trace the outside of the circle of 27 and the inner diameter so it ends before the screws.

Impco 225 Mixer Lean Shim | eBay

It really depends on how rich your mixtures are. Mine were rich but when i leaned off the main screw top end was too lean. Try a few sheets of paper or thin card board.
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  #24  
Old 20-04-2017, 07:46 PM
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200 and 300 complex mixers work the same,just different cubic ft of air flow as denoted by id number.a 200 is better suited for fuel injection as its usually inline where the 300 is carby mounted usually.a 200 is good for about 4 ltrs or so where a 300 will do 6 ltrs.I found on a 300a changing diaphragm from hydrin to silicon worked better than shims.experimented shiming a 200 which worked better but went with the brc gear for more power.gives you about 10hp more at the wheels with 33's and tb42.
As you know dom with the right lpg set up and mild boost you can double rwhp and still get 20 ltrs per 100km economy

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  #25  
Old 20-04-2017, 10:34 PM
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Thanx heaps guys.
Geez, I wish I can absorb the LPG side of your brain(Gasburner & Bond).
I wouldn't mind killing both of you, if that means I can absorb the all the good stuff from both of your brains.
It can save me years of mucking around.
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  #26  
Old 20-04-2017, 10:40 PM
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Originally Posted by Bond View Post
Trace the outside of the circle of 27 and the inner diameter so it ends before the screws.

Impco 225 Mixer Lean Shim | eBay

It really depends on how rich your mixtures are. Mine were rich but when i leaned off the main screw top end was too lean. Try a few sheets of paper or thin card board.
thanx mate.
I'll get onto it straightaway.
I also have the pending job of fixing two carbies to perform the way they suppose to, or get rid of both of them.
LPG tune up is priority anyway, 'cos the troll runs on LPG 95% of the time.
Petrol is for outback trekking only.
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  #27  
Old 20-04-2017, 10:47 PM
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Quote:
Originally Posted by Gasburner View Post
200 and 300 complex mixers work the same,just different cubic ft of air flow as denoted by id number.a 200 is better suited for fuel injection as its usually inline where the 300 is carby mounted usually.a 200 is good for about 4 ltrs or so where a 300 will do 6 ltrs.I found on a 300a changing diaphragm from hydrin to silicon worked better than shims.experimented shiming a 200 which worked better but went with the brc gear for more power.gives you about 10hp more at the wheels with 33's and tb42.
As you know dom with the right lpg set up and mild boost you can double rwhp and still get 20 ltrs per 100km economy
Yeah mate, when I'm ready for turbo conversion, it has to be LPG for me, not petty.
Dual fuel turbo is a distant dream, may be not so impossible?!

I honestly prefer the dual fuel setup for the options it give me on long solo treks.
100km/20litre economy is more than I can ask for a heavy troll like a GQ with all the old school technology in it.
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  #28  
Old 21-04-2017, 05:12 AM
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Carby turbo is simple.Spud truck has just done his dual fuel carby turbo.

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  #29  
Old 21-04-2017, 09:01 AM
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Yeah mate, when I'm ready for turbo conversion, it has to be LPG for me, not petty.
Dual fuel turbo is a distant dream, may be not so impossible?!

I honestly prefer the dual fuel setup for the options it give me on long solo treks.
100km/20litre economy is more than I can ask for a heavy troll like a GQ with all the old school technology in it.
What economy are you getting on lpg? When mine had 200,000 less km i would get 20L/100km but now 22.

I fiddled a lot with mixtures and it made very little difference. What i did find is the GQ used more fuel if cruise was leaned out too much. Mixture is lean but must be using a lot more throttle. Any leaner than 16:1 and fuel use goes up.
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  #30  
Old 21-04-2017, 10:33 AM
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What economy are you getting on lpg? When mine had 200,000 less km i would get 20L/100km but now 22.

I fiddled a lot with mixtures and it made very little difference. What i did find is the GQ used more fuel if cruise was leaned out too much. Mixture is lean but must be using a lot more throttle. Any leaner than 16:1 and fuel use goes up.
Thanx mate. It's very useful to know it's not easy to improve the fuel economy on Impco 300A.
I reckon gas research LPG carby is a better one?!!!

Up until early last year or so, I was getting 6km/L on cruising.
Then it started to drop.
Right now, the gauge(the gauge tor main LPG tank) shows quarter tank, but no gas comes out. I'm thinking the hydro T valve may be not working properly?
The auxiliary tank(inside the vehicle) is definitely empty.
Main tank is under the chassis, but I can't see the tank gauge from bottom.
Tank need to be dropped to be able to see the gauge(or may be not).

I need to re-plumb the two tanks in a way they can be separated from each other both filling & supply line wise.

This is my setup.
https://amrgas.com/hydrostatic-tee-valves#prettyPhoto[123]/0/
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  #31  
Old 21-04-2017, 10:37 AM
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Carby turbo is simple.Spud truck has just done his dual fuel carby turbo.
How would you fine tune both fuels with a turbo setup mate?
How would I avoid detonation?
I'm thinking detonation is a bad thing in a turbo setup?

Do I need to use a dual curve ignition unit?

Thanx
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  #32  
Old 21-04-2017, 11:23 AM
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How would you fine tune both fuels with a turbo setup mate?
How would I avoid detonation?
I'm thinking detonation is a bad thing in a turbo setup?

Do I need to use a dual curve ignition unit?

Thanx
Yeah dual curve ignition box.complex convertor,simple mixture,electronic ignition,boost retard on dissy and inclose carby in sealed box so petrol side remains same.when u flick from petrol to lpg the ignition curve will change via dual curve box.

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  #33  
Old 21-04-2017, 06:25 PM
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Yeah dual curve ignition box.complex convertor,simple mixture,electronic ignition,boost retard on dissy and inclose carby in sealed box so petrol side remains same.when u flick from petrol to lpg the ignition curve will change via dual curve box.
I'm guessing DIY tuneup is probably not a good idea?
Dyno tuner is the way to do it, you reckon or is it ok to attempt a DIY tune with the AFR gauge?
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  #34  
Old 21-04-2017, 06:58 PM
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Diy is easy with afr and knock sensor.I do mine with the gunson on idle then drive and watch knock/afr and adjust boost retard/timing/convertor sensitivity screw

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  #35  
Old 21-04-2017, 10:00 PM
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Diy is easy with afr and knock sensor.I do mine with the gunson on idle then drive and watch knock/afr and adjust boost retard/timing/convertor sensitivity screw
Are there any aftermarket knock sensor/gauge kits?!
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  #36  
Old 21-04-2017, 10:05 PM
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This nifty gadget from Jaycar is pretty useful, I reckon.

https://www.jaycar.com.au/knock-sens...logue/p/KC5444
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  #37  
Old 21-04-2017, 10:06 PM
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And this,

Knock Sensor Monitor - Turbo and High-Tech Performance Magazine
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  #38  
Old 21-04-2017, 10:11 PM
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This is a good article.

AutoSpeed - DIY Detonation Detection - Part 1
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