Vehicle & Technical > Defender
Running LPG mostly and petrol only occassionally
davidjmiller:
Hi, I have a 3.5L V8 which is LPG converted. It runs really nicely on LPG but is often very groggy on petrol. My local garage have tols me this is because I use LPG too much (nearly all the time - only reverting to petrol when I'm stuck between LPG stations). They say this leads to a build up of residue in the carbs which means it dos n't run well on the cheap stuff.
Is this true ?? and if so what proportion of miles should I be doing on petrol??
Thanks, David
ChrisW:
Andygod was talking about timing marks on his 3.5 V8, I know he said it runs like a pig when on petrol compared to running on gas. I believe this is more due to the compromise on the timing between gas and petrol.
Was the engine tuned to run on gas? I would say this was probably more responsible.
Do you know the garage/reputable etc?
Lawnmower:
I had a 109 that only ran on lpg.
tried it on petrol but didnt work - had been standing ages.
Petrol lubricates the seals in the carb, or sumsuch. lpg doesn't, so they dry out, then it dont work on petrol.
also the ignition timing is deifferent for plg vs petrol, so whichever way its set up, it wont work as good for the other. Only let a a lpg proficient garage look at the ignition stuff, or theyll cock it up. Probably worth getting an lpg gas saftey ticket while its in the garage.
jamesledingham:
We've a 1986 2.5 petrol LPG conversion. Like yourself, we only run it on LPG except when stuck! Unfortunately the petrol's not pumping at the moment so when we're out of LPG it involves buying a bottle of scoth for a local chap and borrowing his hydraulic flatbed trailer. Handwinching a defender up a slope onto a trailer is not nice!
It actually runs nicer on petrol though interestingly. It's not not simply that the petrol's been left standing too long is it?
Lawnmower:
--- Quote from: "jamesledingham" ---It's not not simply that the petrol's been left standing too long is it?
--- End quote ---
that reminds me, I read somthing that said premium petrol (bp Ultimate, Optimax) is better to use in duel fuel cars as they contain loads of aditives, that stops the petrol degrading over time.
also how old is the petrol? summer grade petrol is less volatile, and winter grade fuel is more volatile. using summer grade in winter, aint the best way.
Navigation
[0] Message Index
[#] Next page
Go to full version