Start on LPG?

TheBigPurpleOne · Posted: Tue Mar 17, 2009 9:31 pm Post subject: Start on LPG?

hey guys
my 3.5l v8 efi rangie has an old lpg kit on
you have to start on petrol and rev it up to 1000rpm or so and then switch it over... however my v8 doesnt run at all well on petrol (barely runs on it) so i was wondering if theres a way to make it start on lpg?
ive found out that if i press the pedal to the floor and flick the switch to lpg and then turn it on and turn it over it will start but i dont know if that was a one off glitch?
also what do people reckon of the BLOS system?
thanks in advance

Nathaniel · Posted: Tue Mar 17, 2009 11:08 pm Post subject:

Poor running on Petrol can be a sign of something very wrong...

But anyway.

The LPG kit I had on my merc could do an emergency start on LPG.

Make sure switch is on LPG
Ignition on
switch the switch over to petrol and then back onto gas
Then start.

TheBigPurpleOne · Posted: Tue Mar 17, 2009 11:12 pm Post subject:

thanks
well its misfires and delays when ya rev it up on petrol...and on lpg it runs almost perfectly...ill give it a service some day... i might ditch the whole efi set up and just have a propane BLOS carb

mogmaner · Posted: Tue Mar 17, 2009 11:37 pm Post subject:

I youse a impco mixer on my unimog to replase the hole petol system ,this works like a su carb, only startin problem i have had was at -10 flask of hot water over vaporiser solved it ,a little flat till water worms up this takes a cuple of minits.

RichardD · Posted: Mon Apr 06, 2009 7:34 am Post subject:

I have no problems starting from cold on LPG (twin strombergs 175CD) in Volvanimal. I get it started, set the revs at about 1500 for a minute or 2 to get a little heat into the water then off I go.

Mine runs rough and pinks badly on petrol mainly because I have the timing set at 12 or 13 deg BTDC rather than 10. I use 123ignition with a specific lpg FI map.

jon.g1 · Posted: Sat Oct 17, 2009 2:35 pm Post subject:

TheBigPurpleOne · Posted: Sat Oct 17, 2009 3:23 pm Post subject:

have a look at the BLOS carb ive heard good reviews

jon.g1 · Posted: Sat Oct 17, 2009 10:50 pm Post subject:

looking interesting, can the blos carbs be used on there own??, ie with no petrol system?? i must admt i've had a good hunt around and swaying towards the impco carb as cheaper than the blos carbs, look more for your ££ and the have a flange as where the blos would require a rubber tube to meet the manafold.

would be interested though to hear how others have got on with both types before i decide which way to go, how have people found starting??, i'm currently starting my efi on gas as the fuel lines disintergrated! i currently have a omvl r90e vaporiser which i assume if fine for the carb?

TheBigPurpleOne · Posted: Sun Oct 18, 2009 9:03 am Post subject:

i belive you dont need the petrol system but i think you need a butterfly for it to work

jon.g1 · Posted: Sun Oct 18, 2009 7:56 pm Post subject:

ok, i had another good read, the blos mixer isn't a complete carb, it's a varioble mixer that uses vacuum to operate, and can be used along side efi, or carbs and i guess could be used with just a throttle body.

as where the impco ca200 series have a throttle body attached and can be used stand alone as a propane carb allowing me to loose everything bar the distributor which i hope to replace with megajolt in the future to make the truck water resistant Smile

TheBigPurpleOne · Posted: Sun Oct 18, 2009 8:01 pm Post subject:

so the blos system could be used with a butterfly after it (heading toward the engine)?

jon.g1 · Posted: Mon Oct 19, 2009 9:25 pm Post subject: