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Author Topic: Running solely on LPG - not petrol  (Read 2525 times)

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TheBoy

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Re: Running solely on LPG - not petrol
« Reply #15 on: 11 April 2011, 21:06:54 »

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I did get the laptop cable and cd, you can borrow it with pleasure TB, rate I'm going on I'll not be wanting it for some time yet,just PM me the postal address and Ill get it off to you :y :y    
No, not reqd, I have one - just checking you had one, as I know they aren't included as standard any more.
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Lazydocker

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Re: Running solely on LPG - not petrol
« Reply #16 on: 11 April 2011, 22:52:47 »

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I have had a Kenlowe engine pre-heater fitted for the past 6 yrs, as Ive already said I find it to be very good, I'm hopeing it will help speed up the petrol to lpg changeover when I finally get the lpg installed.Just about completed fitting the doenut tank in the spare wheel well, been a right pain sorting out a strong firm bolt on fix for the tank.
Mine is set to 30C or 10s.  No issue with that, in winter switches over within a mile, assuming I haven't left car defrosting on drive ::)

On hot days, probably needs these raising slightly - did you get a laptop cable?
Good point... Can you edit the kit contents thread to remove the cable please, although I have added the info to the message I send out :y
Thought I had? Where is the thread - used gto be in your sig...

Perhaps you have... Not checked it.

Was in my sig until I lost my post count recently and couldn't have a link in my sig when I'd edited my avatar ::) ::) :D :D
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Lazydocker

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Re: Running solely on LPG - not petrol
« Reply #17 on: 11 April 2011, 22:55:03 »

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I did get the laptop cable and cd, you can borrow it with pleasure TB, rate I'm going on I'll not be wanting it for some time yet,just PM me the postal address and Ill get it off to you :y :y    
No, not reqd, I have one - just checking you had one, as I know they aren't included as standard any more.

Part of making his kits more competitive in general as they aren't included from any other manufacturer ::) ::) ::)

Plus he figured that we had enough between us as he thought (incorrectly!) that most of the kits were going to be fitted by a certain few people ::) ::)
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PMitchell

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Re: Running solely on LPG - not petrol
« Reply #18 on: 12 April 2011, 15:13:45 »

I was talking to the guy that was servicing my BRC LPG set up last December in Oxford and he was saying that there is now an evolution of the LPG liquid injectors that were around a while ago, but that these actually work and he's fitting them to some BMW variants for testing in one of the touring car series.  The difference is apparently that the guts of the liquid injector (no vapouriser, no gas) are ceramic of some sort and work in a slightly different way to the old ones and don't have the membrane or something - I forget what exactly but that's 'cos I'm old - and so don't freeze, as they are essentially now the evaporator.  Anyway the point is stuff exists that means you can ditch one more part - the evaporator or vapouriser - and go direct liquid injection in much the same way as petrol.  I'm guessing that there is some cleverness going on in the gas ECU as it must have to know gas temp. and it probably can't due to there being no sensor nearby.

It might be worth having a chat with him.  www.oxfordautogas.com

Cheers

Paul
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feeutfo

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Re: Running solely on LPG - not petrol
« Reply #19 on: 12 April 2011, 15:20:46 »

Yes have heard of these newer systems. Guessing it will be a while before they are available, and cheap enough...?   :-/
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Kevin Wood

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Re: Running solely on LPG - not petrol
« Reply #20 on: 12 April 2011, 15:26:29 »

Yes, liquid injection has some nice properties. You lose the reduction in power completely because a liquid fuel doesn't displace as much air as a vapour.

I understood the tank-mounted pumps caused problems with them, though?

I would imagine it's also not easy to keep the whole fuel supply system liquid either, given underbonnet temperatures?

You could probably drive the injectors from the petrol ECU pretty much directly if the fuel pressure is under decent control and the injectors correctly sized. Gone is the need to compensate for vapour pressure and temperature. I guess it wouldn't need the same enrichments during warmup, though. :-/

Problem is, it's not the cheapest solution, and everyone in the LPG supply chain is interested in supplying "cheapest possible" solutions to people whose only motivation is to save money hence we're only just starting to get away from god-awful mixer systems being the norm.

It's a shame, because I think LPG has potential to offer good performance benefits for those who care to put their hands in their pockets and build something a bit more optimal than a bolt-on kit on a standard engine.

Kevin
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OMEEEGAH

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Re: Running solely on LPG - not petrol
« Reply #21 on: 17 April 2011, 15:31:28 »

i have only ever seen 1 car fitted with a kenlow hot start which was th correct name given for the kit,it did work but its a bit of a gimmick really. just wear warm clothes and man up lol  :D
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