Jeep Grand Wagoneer - Single Point System Advice

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Gilbertd
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Re: Jeep Grand Wagoneer - Single Point System Advice

#21 Post by Gilbertd » Sat Apr 18, 2020 6:30 pm

Don't adjust too much. On the vapouriser, give it no more than a quarter turn at a time.
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Brynjaminjones
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Re: Jeep Grand Wagoneer - Single Point System Advice

#22 Post by Brynjaminjones » Sun Apr 19, 2020 10:29 am

Good morning all,

I'm going to have a play with this shortly, but I just had a thought before I start.

Can I adjust the LPG system with a vacuum gauge like I would when tuning the petrol carb?

Gilbertd
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Re: Jeep Grand Wagoneer - Single Point System Advice

#23 Post by Gilbertd » Sun Apr 19, 2020 10:32 am

Probably not......
96 Saab 900XS, AEB Leo, sold
93 Range Rover 4.2LSE, Lovato LovEco, sold
97 Range Rover 4.0SE, multipoint, sold
98 Ex-Police Range Rover 4.0, AEB Leo, daily motor
96 Range Rover 4.6HSE Ascot, AEB Leo, my spare


Proud member of the YCHJCYA2PDTHFH club.

Brynjaminjones
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Re: Jeep Grand Wagoneer - Single Point System Advice

#24 Post by Brynjaminjones » Sun Apr 19, 2020 3:21 pm

Right, I've had a good tinker with it today!

I opened the intake flap to the cool air position then tried to tune it first.
Even after getting it to idle as high as possible by adjusting the bias on the R90E, I could get another ~150rpm immediately just by putting my hand over the air intake.

I therefore put the flap back to the hot air position and tuned it like that.

Afterwards the idle improved slightly. It's definitely idling a little smoother. More importantly, I found that I needed to wind the power valves out a little.
Once I was happy I'd got it as good as I could, I put my hand slightly over the hot air intake and the revs immediately dropped, so it looks like it doesn't want restricting further.

I've just been for a good drive and I'm pleased to report that it's more powerful than it's ever been on LPG!

In all the time I've had it, nobody has ever really spent any time tuning it correctly.
I'm sure it's not perfect, but it's much better than before!


Thank you all for your help, I couldn't be more pleased with the results.

Gilbertd
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Location: Peterborough

Re: Jeep Grand Wagoneer - Single Point System Advice

#25 Post by Gilbertd » Sun Apr 19, 2020 4:28 pm

Well done, and you've learnt a lot in the process.
96 Saab 900XS, AEB Leo, sold
93 Range Rover 4.2LSE, Lovato LovEco, sold
97 Range Rover 4.0SE, multipoint, sold
98 Ex-Police Range Rover 4.0, AEB Leo, daily motor
96 Range Rover 4.6HSE Ascot, AEB Leo, my spare


Proud member of the YCHJCYA2PDTHFH club.

LPGC
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Re: Jeep Grand Wagoneer - Single Point System Advice

#26 Post by LPGC » Sun Apr 19, 2020 6:24 pm

A balancing gauge for multiple carbs wouldn't be of much use but a gauge of manifold vacuum can be useful for getting idle mixture the same as it is on petrol, especially if the engine has automatic idle speed control (or combined with an accurate rev counter if the engine doesn't have automatic idle speed control).

Out of interest, how did idle speed on LPG compare to idle speed on petrol before adjustment and how do they compare now?
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Brynjaminjones
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Re: Jeep Grand Wagoneer - Single Point System Advice

#27 Post by Brynjaminjones » Tue Apr 21, 2020 1:15 pm

Yeah, a manifold vacuum gauge is what I used. I did find it helpful actually. I mostly went by the engine rpm, but I managed to fine tune it even further by getting it to peak manifold vacuum.

I didn't actually compare idle speed on petrol/LPG as it's a bit of a pain to switch over. Next time I do though I'll report back!

CNG
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Re: Jeep Grand Wagoneer - Single Point System Advice

#28 Post by CNG » Sun May 10, 2020 9:27 pm

Unless you've vacuum leaks.... sounds like a mirror the issue i had running 2 x BLOS mixers with an OMVL before it'd run near to Stoich. See my thread on this. To this day I have 1 x cooker-ring + 1 x BLOS on there. Another 'old-skool' and pretty juicy engine with not enough draw on the OMVL.

viewtopic.php?f=33&t=15479&start=20

You likely need a Leonardo, and perhaps 2 x mixers liek me. Leonardo put on hold for now, my BLOS is very, very good so no hurry.

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