LPG and carbs and V8's (1 Viewer)

[johng]

hi all, are there any LPG experts out here? particularly regarding non sequential systems fitted via carb to a dodge/ford/chevy V8 ?

thanks
John

 

[olley]

Hi John not an expert, but that's what's fitted to my winnie.

Olley

 

[johng]

what mixer do you have olley? make etc?

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[olley]

Hi John its an IMPCO

 

[johng]

thanks Olley..

 

[American Dream]

Hi John.

Mine's a Tartarini.

Just waiting for a brand new Edelbrock Carb and New Electronic distributor before I get mine set up.:thumb:

I have noticed they are mainly Impco if converted in the States.Was yours converted Stateside Olley?

Nearly bought an IMPCO complete lpg conversion, but this was a full conversion involving the removal of the carb and no bi-fuel switching.

Good kit though.

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[johng]

lpg+pic+2.jpg (image)

is mine...

seems a tiny gap for air to come through and mix with gas, when switched to LPG..

also there is a (manifold) vacuum switch that seems to be wired backwards, this controls vac to mixer..

supposed to be full vac to mixer on petrol, allowing the mixer plate to rise and open completely = full air into engine and then on LPG the vac should be cut off, allowing a much smaller amount of air in..

getting my head around it

maybe more to follow..

 

[olley]

Hi AD no it was converted by Logical near Northampton, got ripped off, didn't research it enough at the time, all fuel injection engines should be multipoint, but by fitting a gas carb he saved money. Still live and learn.:Angry:

Olley

 

[johng]

Olley my carb melted a couple of years ago

lpg and monopoint and airleaks it seems

see here
Link Removed down near the bottom.. explains my problem with the fire I think..

new carb built and on, but need lpg this weekend for cornwall

will get there

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[vwalan]

try googling rpi engineering .they specialise in v8,s and do alot of lpg stuff. i knowalot of custom guys use them cheers alan.

 

[Larrynwin]

Hi John I believe that RPI that Alan mentions are at Horsford near Norwich. There is also another good firm in the area who converted my Hurricane a couple of years ago, they are JAYMIC at Cromer.

Larry

 

[vwalan]

another company that used to do alot of gas stuff is gas automotive services .hednesford, staffordshire. last known tel,01543 878070. we used them for bits for vw,s they used to be very helpfull worth a try. ..they also had impco gear. hope its all usfull info. cheers alan.

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[American Dream]

Olley my carb melted a couple of years ago

lpg and monopoint and airleaks it seems

see here
Link Removed down near the bottom.. explains my problem with the fire I think..

new carb built and on, but need lpg this weekend for cornwall

will get there

I remember your questions at the time John.

I am surprised just how cheaply we are able to buy from the States now the exchange rate is/was getting Better.:thumb:

What capacity tank are you fitting and where please?

 

[johng]

ahh AD, i brought mine with a measly 100L tank

a bigger or seperate one is an option for the future...

i will have it running on gas this week

 

[ginge61]

hope you get it sorted john , we were down cornwall last week ,no ovenight parking in mpst places wouldnt rush back there , lol i have a systym fitted and 2 tanks think you seen that one inside and one underslung 70l plus 88 l inside aprox 200 mile range off that aproxx 120 liters of use ok for me as i think around 3-4 hours driveing and a break around that time is fine your 100 l tank should give you aroun 80 liter use aproxx 140 plus milage plenty of gas down that way around 56-59 ppl make sure you got no leaks on the gas systym thats te bigest prob norm i had to change all the plugs thinking one was a miss but alas nope still had the prob it was the bottom carb gasket its a thick one as gaskets go lol but a piece blew out ,think it must be the newness wearing off lol so i repared the thing with some stuff called j b weld and was impresed it got me home so now have to order a new one and carb off again . those plugs up front are a pain to do on the side of the road ,ohh you can park oppsite st michales mount for nothing quite a few vans there ,lands end is a fiver to park if you use the car park . but my mate says park at seamans cove and walk round to lands end youll see the sign on the way in .:thumb:

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[johng]

thanks Ginge

can you tell me what your mixer is >? or take a pic

yep know the thick gasket you mean! .. re@ cornwall already booked only 2 nights there on a site i have used before, will be a pleasent little break.. long way to go for only a few days mind..

just changed plugs, hate plug #2 always scratch my arms on the floor pan

getting good now, about 3 mins to get all out

 

[ginge61]

stuk them in the gallery on my profile whats the secret with the plugs lol

 

[johng]

dunno its much harder trying to look into the carb while its fitted, very tough.. (I keep checking me butterflies are behaving)

spoke to my lpg chap and he confirmed a question I had about manifold vacuum controlling airflow into the mixer... so should be able to sort that,..

thanks for pics Ginge, yet again a different set up.

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[American Dream]

Got good news here John

The dizzy is in the country and they tried delivering today..oh::Cool:

Really need the carb now...and the exhaust.

Really getting fired up now as the end is in sight.....Spent the weekend UNDER the RV waxoyling it ready for it's Winter travels.....

It's a mucky job but somebody's gotta do it.:thumb:

 

[johng]

great

not so from me

so much for going to cornwall tomorrow on LPG

it wont run on petrol anymore no idea whats going on.. bit fed up with it today

some tests to do later


J

 

[olley]

Hi John I had that problem, turned out to to be the relay, we managed to get to a lay-by just of the M25 as we had almost run out of LPG and called the RAC, one of the first things the guy thought of, I also phoned Logical who did the conversion while waiting for the RAC and he suggested the same thing, RAC man didn't have a spare but he shorted two of the terminals out and it ran

The RAC man reckoned the problem was that logical had mounted the relay on top of the engine, so the vibration killed it, I moved it to the firewall after we got back home, a new relay from Lucas was only a few quid, and its been fine ever since.

Olley

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[johng]

thanks Olley but this is just plain odd..

drove to newforest and back with no problems.. just as I got home the van 'ran-on' for the first time ever..

I paid no heed, and set about making some changes to help with aspects of the ignition, including new diz cap, rotor, plugs, and tested HT leads.. (all was fine with this, I just had new bits)

I fitted a vacuum break which helps stop the carb bogging during WOT

thats all..

its never ran since

IT does fire, for a rev or two then dies....

there is fuel everywhere so it seems to be running rich..

there is a spark at plugs

carb came off last night due to suspected float issues, none found, a rebuild has made no difference..

the battery doesnt seem to be as effective as it always has.. soon discharges.. only started happening in last couple of weeks..

at a loss really

will go home tonight and throw the strobe on a lead to make sure the spark remains even after the engine stalls..

have chekced fuel supply, all seems fine.. by passed the fuel cut off relay too..

will do a comp test agian but doesnt explain why she seems to run well for a few seconds and then give up...

hmmm annoying

 

[ginge61]

sounds like an air leek somewhere check all the joints on the manifold to the exaust where they join at the down pipes and also sounds like timeing out a touch the gas systym may have 3 settings on also and if not on the correct one will try to run on both fuels hence too rich or poss choke sticking on on petrol

 

[johng]

got it

what a nightmare


failing main ignition coil the sparks fly for a bit then dry up, never seen out lilke it.. explains everything....

coil is hot and resistance is wrong, expect it to be ok again in 30 mins when its cooled down..
bugger

thats cornwall written off

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[ginge61]

you must have a diff dizzy coils in the dizzy on mine you should be able to get a coil

 

[johng]

hi Ginge, mine is HEI.. coil is in the dizzy cap..

need one tomorrow

 

[Dodgey]

John, just reading through.....the yanks have a thing for external ballast resistors for the coil, looks like a 1/2" sq by 1.5" long bit of ceramily stuff, gone south?

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[johng]

hi Simon..

maybe.. but checking the resistance of the main coil has kinda proved it's not happy.. wish I could get my hands on another today..

there is a chevy place in a village near here, bizarrely.. will ring them and see if they have something knocking about

 

[johng]

and they have

the unit they use for substitution, its mine for forty squid

what cost, to have the RV running again

picking up at lunchtime and going to stop in a local village pub to dwell on the whole saga

 

[kandave]

LPG Conversion on Chevy 7.4 Vortec

Hi, I've had several quotes for an LPG conversion and I'm being offered different systems. All are multipoint (grateful for the comments on the carb conversions described here) and I wondered if anybody had any views on whether one was better than others; is there one to avoid? So far I have been quoted for Romano, BRC, Prins, and OMVL. Whilst money is an overriding factor I don' want to make the decision on price alone. I don't want to save £500 and end up with a problem that could cost a lot more to put right.
Any other coments / recommendations on lpg conversions would be greatly appreciated.

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