LPG for shiters

[lisbon_road]

Well, my conversion is complete thanks for the Polish converters I used.  It has all been a bit of an adventure but it runs very well now.  

 

I asked about the Rolls Royce.  He said he could do it fine, no problems, but was concerned that as a carburettor car, occasional back fires are inevitable and tend to blow the airbox/filter up.  On an ordinary car, that's fine, just get another but on a Roller the cost would be an issue, hence he was reluctant.

 

They clearly knew what they were doing.  It will start on lpg and now seems to be set to always start on lpg.  This is Acstag kit, which seems well thought of.

 

I'd like to go to a timing advance processor but need to learn more about them.  Acstag seem to make one with would just connect in easy, which is good.  

 

The cost wasn't bad though using a small converter means they don't have much stock and if anything goes wrong, it is back another day.

 

But it is done.

[The Moog]

Why was it an adventure? How much did it cost in the end

 

I am seriously tempted to get the saab converted. It currently averages 27 mpg and I normally do 15k a year. I think it is a keeper as well.

[cros]

I finished doing the Rover 75 last night and all's well- it got to the pub and back. One minor hiccup was that I thought I might get away with a K&N stylee filter (not normally recomended with carb LPG conversions) as one of these was fine with the Blos mixer on my other LPG car. However it was not to be, - wrapping a rag around the filter showed that it was too free flowing so I re-instated the clumsy oil filled jobby.

  What is successful is the stream mixer which doesn't seem to restrict the airflow like the normal types, thus the car is only as lethargic as it was previously. You can't afford to lose performance with Auntie.

The real cost would have been around £500, but as I already had quite a few bits I spent £200. Took 12 hours doing the job, so payback won't take long. Car starts from cold fine on gas. Will be interesting to see how the engine copes as its an outdated design known for burning out valves.

[brickwall]

Nup, this chap des it fae his house

 

 

Is that Dougie?

[lisbon_road]

£800 including tank of gas.

 

Why was it an adventure?  Rather a lot of trips - various parts didn't fit and so on.  But they are conscientious and competent, and make a big effort not to make holes in the car which is good.  

[lisbon_road]

I've been reading about timing advance processors.  If anyone on this forum actually knows much about this, please chip in!

[cros]

Here

 

I've been reading about timing advance processors.  If anyone on this forum actually knows much about this, please chip in!

Depends what car you've got. The processors only usually change the timing curve by a preset amount, so if it bothers you it might be better to fit a mappable system and set it up on a rolling road. On old stuff like I run the timing curve is nowhere near right for modern fuel anyway so altering it by a set amount may not do much good. I've 're-mapped' my distributors by restricting the travel of the weights and changing the springs- LPG needs less total advance but more initial advance. Then I go up the road and see if I feel happier. We're very scientific in the fens.

  Heres my finished installation. Theres no discernable difference in power between petrol and gas, timing was advanced 4 degrees and nothing else altered. Have a 300 mile trip this week so will see what the consumption is like.

 

[lisbon_road]

I am wondering if you are right Cros - better off with a mappable system.  I have a spare cylinder head which has been flowed and so on so the petrol map would not be right anyway, plus I feel a bit uncomfortable with all these electronics sitting on top of each other as it is - as the lpg ecu does.  Cumulative error and difficult fault diagnostics and so on, much as I am impressed with the AC Stag stuff.  It really does start on lpg and I don't know how it work, but it doesn't stink of gas so it isn't following a petrol enrichment.  

 

 

[lisbon_road]

I am wondering if you are right Cros - better off with a mappable system.  I have a spare cylinder head which has been flowed and so on so the petrol map would not be right anyway, plus I feel a bit uncomfortable with all these electronics sitting on top of each other as it is - as the lpg ecu does.  Cumulative error and difficult fault diagnostics and so on, much as I am impressed with the AC Stag stuff.  It really does start on lpg and I don't know how it work, but it doesn't stink of gas so it isn't following a petrol enrichment.  

[mat_the_cat]

I put an interesting sounding link up earlier regarding timing for LPG, but not personal practical experience.

[lisbon_road]

Yes, that was interesting, but what I don't know is what the various devices on the market do and how to set them up.  Sounds like a rolling road job to me really.  

 

Did about 120 miles today.  Runs very well, definitely more power than before and smoother.  Hard to tell how much gas it is using and the gauge is fairly useless as indeed they always are.  I expected that. Seems to beep now and then which could get annoying so will need to work out why.  Starts fine on gas though.

 

Of course when I went to tell the insurance company, they said 'no way - no LPG cars here'.  So I cancelled the policy and they hit me with a £75 cancellation charge, and this is on a £144 policy.  Never ever use igo4 insurance.  Never.

[mat_the_cat]

Seems to beep now and then which could get annoying so will need to work out why.

 

Is this under load? If so could be pressure drop off under high demands, which in itself could be LPG surge away from the pick-up pipe, and/or the vaporiser struggling to cope under load.

[lisbon_road]

No.  It seems that when you set it to start on gas, which you do by switching the ignition on while pressing the gas button and hold for a few seconds, it then beeps a few times after you've started.  But the next time it doesn't.  The 'set to start on gas' doesn't seem to be needed for a few starts.

 

Unless I am missing something completely.  But I did 120 miles this morning.  It started on gas without any special anything and didn't beep.

 

I have to take it back at 1000 miles for an inspection.  I will ask them then.