LPG On The V8 - Rolls-Royce and Bentley Forums
 
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post #1 of 10 (permalink) Old 03-24-2019, 12:43 PM Thread Starter
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LPG On The V8

Just been contemplating my Car for quite a while, suddenly the "lightbulb" went off and i started thinking about alternate fuels.

I'm sure some know of EU's hatred for ICE engines at the moment, LPG seems to be in favour because it is "green" and that got me thinking..

To futureproof my Silver Shadow I've been contemplating running her solely on LPG - I've spoken to a few fabrication people and it is Possible to have an LPG tank put in place of the petrol tank, and have the LPG filler adaptor put in place of the Petrol filler, essentially making a conversion that would be unnoticed..


Prins And AC stag both say that you can run a Carburettor V engine on LPG from the get go..

No need for warm up like on a conventional EFI setup..


price is also a good thing for me, i want to drive this car

Petrol is £1.29 a litre or $1.70 a LITRE!!! not GALLON!!! thats a surprise to our American Members

LPG is 50p - 75p a litre

You can also have a "station" installed at your own property if you have the land - I do as i live on an old Farm.


So a FULL LPG RR V8......................


What do the connoisseurs of the Classic Brand think of my idea?

1977 Silver Shadow 1 SRH 26532 - seychelles Blue - Awaiting a full restoration.
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post #2 of 10 (permalink) Old 03-24-2019, 04:37 PM
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One of our Irish members has done it on a Silver Spirit V8 and was happily getting the equivalent of over 30MPG in real terms when comparing fuel cost to petrol. He didn't have his own supply tank though. He also changed the differential and could get 60MPH at 2000 RPM which added to the fuel saving. It's important to have the conversion done by an experienced professional, it's an expensive modification so it only makes economic sense if you are using the car regularly.
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post #3 of 10 (permalink) Old 03-24-2019, 06:22 PM Thread Starter
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Aye i plan on driving the car once she's restored.

No garage queen here..

But she'll only come out when it's dry!!

1977 Silver Shadow 1 SRH 26532 - seychelles Blue - Awaiting a full restoration.
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post #4 of 10 (permalink) Old 03-25-2019, 04:33 AM
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Henry.

This subject has been brought up on the forums before and the opinion seems to be that unless you are doing at least 6000 miles a year, converting to LPG is not justifiable.

There are two things that would trouble me. The devaluation of the car, which I believe to be large as it will be difficult to find anyone who would want a LPG Shadow. I do not know the cost of having the conversion fitted but suspect it would be £1500 at least.

Any longer journeys would require planning to find somewhere on route that sells LPG.

This is just my opinion based on other forum members posts in the past. I have no experience of LPG at all.

Jake.
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post #5 of 10 (permalink) Old 03-25-2019, 05:12 AM Thread Starter
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Originally Posted by jake66 View Post
Henry.

This subject has been brought up on the forums before and the opinion seems to be that unless you are doing at least 6000 miles a year, converting to LPG is not justifiable.

There are two things that would trouble me. The devaluation of the car, which I believe to be large as it will be difficult to find anyone who would want a LPG Shadow. I do not know the cost of having the conversion fitted but suspect it would be £1500 at least.

Any longer journeys would require planning to find somewhere on route that sells LPG.

This is just my opinion based on other forum members posts in the past. I have no experience of LPG at all.

Jake.


The Initial Restoration is going to run 8k atleast

LPG conversion is favourable for the future as it'll allow me to drive this car a reasonable distance without worrying about petrol prices.

A conversion is about £1500 to £1800 for the kit i have in mind..

Yes it will de-value the car but i don't see myself selling it


Routes could be an issue but i'll cross that bridge when/if i get to it..

I'll probably restore her on Petrol and when the time is right convert her



Appreciated..

H

1977 Silver Shadow 1 SRH 26532 - seychelles Blue - Awaiting a full restoration.
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post #6 of 10 (permalink) Old 03-26-2019, 04:50 PM
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Hi,
I have put LPG on a Bentley eight & and on a Spirit,the 2 cars ran better on LPG than petrol,I was getting 10 to 13 mpg on LPG from my Spirit when on petrol it did 13 to 16 on petrol.I ran the Spirit on LPG all the time.
I was driving them about 400 to 500 miles a week I was driven everyday at 50 to 70 mph
If you go to LPG I would advise you to change the standard plug leade for heavy duty 10mm leads,fit iridium plugs,this is important for LPG
The Bentley 8 did 15 to 16 on LPG = to 30/32 mpg BUT I changed the diff got a 2.28 It cruised at 70 mph @ just under 2000 rpm
The shadow has a 3.08 diff which is doing 26 mph at 1000 rpm.
I would not tke out the tank as I liked to do a few miles on petrol with 2 stroke oil added to the petrol 100/1 mix.
You can get a micro filler under the petrol flap with a screw in fitting.The Shadow is the cheapest to convert .
If you leave the tank in the car you can remove the gas unit and no one will know,there is no drilling needed there is an adapted plate that fits under the carbs.
I have just purchased a 1988 spirit with injection and a 2.69 diff ( 31 mph @ 1000 revs) I won't put it on LPG as I am only doing 3/4000 miles a year now ( retired)
If you need any advice on it contact me.
Kevin Deasy

Kevin Silver

Shadow11 (sold)
Bentley 8 (sold)
Spirit 84. (Sold)
Turbo R. (Sold)
Spirit 88
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post #7 of 10 (permalink) Old 04-01-2019, 12:10 PM
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Going forward, I'm not sure LPG will be easier to obtain than Petrol. I ran a Jeep Commander 5.7 Hemi on Lpg until about 2 years ago, and - purely anecdotally - I noticed that there was a reduction of filling stations, or stations where the pump was out of service "temporarily", but never coming back.

10-20 years ago, LPG was a lot more popular, because there were a great many candidate vehicles for conversion - there were lots of thirsty petrol 4x4's and big cars available new or used. But these just don't exist any more in the numbers they used to, and haven't really been made for some years. The only big thirsty petrol vehicles made today tend to be specialist low volume models. I think LPG dying out for this reason.

The LPG specialist who pulled the LPG tank out of the my Jeep (it was a decent OMVL sequential system, but that engine was just meant to run on Petrol and I gave up on the LPG and the lack lustre performance) (the tank weighed in at about 100kg, empty, which was a huge weight saving!) said he only had a fraction of the LPG business he used to, because of general decline, and had moved his business towards maintenance of classic cars like MG's and the like.

For this reason, personally, I would proceed with some caution before shelling out on a conversion.

1996 model year Continental R 53165
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post #8 of 10 (permalink) Old 04-04-2019, 09:09 AM
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Quote:
Originally Posted by Henry_b View Post

Yes it will de-value the car but i don't see myself selling it

H
I agree, - from what I have seen, they can make the car powerfully unattractive, though I wonder whether camouflaging the tank (possibly a darker colour?) might make it less noticeable? This bloke has obviousiy got it wrong, the tank looks on my monitor to be a bit lighter than the car so it looks relatively more obtrusive. Actually quite a lot of work was done during the war on painting the sides of ships to make them less visible in battle or to submarines.

But this would definitely affect the value adversely.




Of course, an alternative would be to separate the tank from the car altogether, which would have the advantage of potentially doing less damage to the bodywork. But Im not sure that this wouldn't also affect the value of the car itself on resale?


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post #9 of 10 (permalink) Old 04-05-2019, 11:30 AM
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I had a friend who burnt out the valves on his V8 LPG Range Rover. Apparently you're supposed to use petrol as well for periods but I know nuffink.
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post #10 of 10 (permalink) Old 04-06-2019, 09:46 AM
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LPG is a gas in a liquid form at pressure or at cold temp -40 deg C, It is Liquid in the tank and line leading to vaporizer. The vaporizer Is large body regulator control by a vacuum from the mixer valve (carburettor body on low cost conversions)
Full kit come with mixer valve. Vaporizer is heated by cooling system fluid. To help turn from liquid to gas.
Then engine is cold.The air temp is -20 degs C. The gas will vaporize slowly engine will run rough. Not smooth.
LPG unlike petrol what runs at about 14:1 by weight at idle. LPG will run from 9:1 through to 20:1 very lean. So make sure to get mixture rate right. To lean will take out exhaust valves. If car has air pump blowing air into exhaust port leave it on. This will help keep the exhaust valve cooler.
Good luck
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