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Author Topic: LPG installation WIP  (Read 25256 times)

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JamesV6CDX

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Re: LPG installation WIP
« Reply #225 on: 02 December 2007, 10:33:03 »

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NGK 2 electrode as suggested for the 2.5 3.0 as 2 electrode is supposed to be better for gas

Really?

I hear NGK are always the best for gas... but also heard that single electrode is best on gas?
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Martin_1962

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Re: LPG installation WIP
« Reply #226 on: 02 December 2007, 10:40:07 »

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Quote
NGK 2 electrode as suggested for the 2.5 3.0 as 2 electrode is supposed to be better for gas

Really?

I hear NGK are always the best for gas... but also heard that single electrode is best on gas?


You can try single electrode but I was recommended these by NGK, can you get sigle electrodes for them.

Mine runs better on NGK 2s than Bosch 4s
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TheBoy

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Re: LPG installation WIP
« Reply #227 on: 02 December 2007, 10:44:41 »

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I've seen knock sensor wires cut clean off before, or unplugged, but it won't result in a missfire, unless your petrol is awful....
a damaged knock sensor will make it run like a sack or shite about 2k rpm. petrol or lpg.
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Kevin Wood

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Re: LPG installation WIP
« Reply #228 on: 02 December 2007, 10:47:19 »

NGK do make an iridium single electrode plug specifically for LPG converted cars - BKR6EIXLPG for the V6 allegedly.

Kevin
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Jay w

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Re: LPG installation WIP
« Reply #229 on: 02 December 2007, 10:53:25 »

I was told that nkg twins were better for gas, so we took out the bosch super 4s.

when the eml light comes on the car runs very flat throughout the rev range, turn it off using launch and for the 30 seconds or so it is off it is much more peppy.

gas feel like one or two cyliders are out, today I am going to try and find out where the problem lies by using the diagnostics program supplied to knock out injectors until I figure it out
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JamesV6CDX

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Re: LPG installation WIP
« Reply #230 on: 02 December 2007, 11:07:45 »

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NGK do make an iridium single electrode plug specifically for LPG converted cars - BKR6EIXLPG for the V6 allegedly.

Kevin

I'll be getting a set of those, for when I install my new leads, then  :)
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Kevin Wood

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Re: LPG installation WIP
« Reply #231 on: 02 December 2007, 11:13:47 »

Double check the number in case it's wrong. That was just from an internet search, but it sounds interesting. Not cheap though.  :o

Might be worth trying to gap the existing ones a bit closer first?

Kevin
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Taxi_Driver

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Re: LPG installation WIP
« Reply #232 on: 02 December 2007, 11:21:49 »

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I'll confirm the system works well when I get rid of my missfire

Although generally it's acceptable on gas, accelleration is not the same as that of petrol, it feels a little asthmatic when given some welly. Saying that, I left a golf in my dust this evening when on gas, so it's not as bad as I make out - just .. noticable. Although, I guess there will always be a bit of a drop on LPG.

I also get a bit of hesitation when revved from standing start, but I think that's another characteristic of LPG, it's not noticable under normal driving.

I rekon I also need some new leads, and maybe a new coil pack to cope with the LPG - so we'll see what happens when I've investigated these options.

Your welcome to come and try my 2.2 James.....i think you'll find it behaves exactly the same as yours, tho less power obviously......from what you describe mine does the same and its always been like it. Altho mine has started missing on lpg idling until fully upto temp.....that might be the cold weather or my plugs are overdue a change  :-/

Ive always used vx plugs twin electrode.
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sassanach

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Re: LPG installation WIP
« Reply #233 on: 02 December 2007, 12:08:52 »

on the subject of "missing on gas" i had a similar problem with mine when i first assembled it , it would only run on five cylinders.so after dissasembling various injectors and swapping them about to see if the problem would "move",i discovered that i had one of the pipes trapped under the plenum and the gas could,nt get through.easily done and you only have to crush the pipe 1mm to block it.btw i am still running the same plugs, leads and dis pack that i bought the car with 18months ago, i must have done something right in a previous life that im not aware off
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JamesV6CDX

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Re: LPG installation WIP
« Reply #234 on: 02 December 2007, 12:12:37 »

We did also consider the possibility of a partially blocked gas pipe

Mine doesn't run on 5 - usually runs on 6, but that becomes 5.5 under load...
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sassanach

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Re: LPG installation WIP
« Reply #235 on: 02 December 2007, 12:22:02 »

its also my belief that if you want a gas or a liquid to travel as fast as possible the you make the supply pipe as straight as possible, ie no bends. from what i can make of it you have introduced at least 2  sharp 90 degree bends in your system.one at the supply nozzle and of course the gas injected into the inlet manifold has an immediate right turn to enter the inlet stream thus losing speed.wether this is your problem or not  ive no way of knowing.btw when the nozzles point in the same direction as the petrol injectors the supply pipe also gets shorter which cant hurt.
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JamesV6CDX

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Re: LPG installation WIP
« Reply #236 on: 02 December 2007, 12:23:51 »

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its also my belief that if you want a gas or a liquid to travel as fast as possible the you make the supply pipe as straight as possible, ie no bends. from what i can make of it you have introduced at least 2  sharp 90 degree bends in your system.one at the supply nozzle and of course the gas injected into the inlet manifold has an immediate right turn to enter the inlet stream thus losing speed.wether this is your problem or not  ive no way of knowing.btw when the nozzles point in the same direction as the petrol injectors the supply pipe also gets shorter which cant hurt.

Have you got a pic of your manifold, that I could copy?
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sassanach

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Re: LPG installation WIP
« Reply #237 on: 02 December 2007, 12:27:04 »

unfortunately not.
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Jay w

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Re: LPG installation WIP
« Reply #238 on: 02 December 2007, 12:36:46 »

right we have had a small breakthrough this morning......

Been playing around with the system, knocking out one cylinder at a time.

Got to number 5 and there is an improvement, it runs smoother and picks up like a petrol engined car.

when i switch injector 5 back on the lambda readings dip to nearly 0.00 and it runs like a dog again

now i know that by switching a gas injector off it puts the petrol one on, so i have 5 running on gas and 1 on petrol.....

when i try this with any of the other cylinders there is no change, number 5 is not alive  ::) by the seems of it.

Pipework is Ok, nozzle is drilled, i can pull the pipe off the nozzle and blow into the engine without any issue, how do you test an injector though?
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JamesV6CDX

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Re: LPG installation WIP
« Reply #239 on: 02 December 2007, 12:47:49 »

Fantastic progress, you have a great start point now

Pull off the injector off for that bank, and try blowing into/sucking through the main gas inlet for it. If you can blow OR suck then you have an injector stuck!
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