Re: IML: LPG Conversion

["Rob van der Es" <R.vdes@xxxxxxxxxxxxxxx>]

Hello Eric,

Nice to see that you are interested in LPG conversions too.
Funny to notice that the price for LPG in your area is amost the same as in 
my place in the Netherlands.
I have filled my tank today and the actual price at the moment here is 
$1.99.
The price of petrol triples that..

The drop in fuel economy was 10 % in my case, and I didn't notice a power 
drop.
I have used parts that should be available too in the US.

The convertor is made by OMVL, an Italian company (most LPG convertor 
factories are in Italy actually), I have used type R90/E big block version 
(up to 8 litres).

The gas intake ring on the carby comes from Australia and is made by 
SprintGas, it fits perfectly on an Edelbrock carb or a Carter.

You are right as far as the compression ratio is concerned, due to the high 
octane rate of LPG (typical 110 in my country) you can go has high as 12:1 
without the risk of pinging.

You can also advance the ignition a lot, I have set mine to 12.5 degrees 
BTDC at the moment but got even better results with an advance of 14 degrees 
BTDC! However, since I run a dual fuel setup I risk pinging then when 
switching to petrol in the case that I run out of LPG.

To be safe in that situation I have set it to 12.5 degrees BTDC.

Robert
----- Original Message ----- 
From: "Eric" <gearhead@xxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Thursday, June 21, 2007 8:03 PM
Subject: IML: LPG Conversion


> LPG conversions have interested me in the past. It's about $1.99 a gallon 
> in my area, whereas premium petrol is currently running $3.16. Depending 
> on the gas metering valve, it's reported that a 10-20% drop in fuel 
> efficiency can be expected.
> I'm to the thought that if one ups the compression ratio that this can 
> offset this decrease in efficiency. I've read that the 105-110 octane that 
> LPG provides has a corelation to about a 12:1 compression ratio, which is 
> an easy swap to aftermarket HP pistons in a 440.
> LPG also responds to recurving the ignition advance but I'm not sure if a 
> slower or faster advance is preferable.
> Rob, have you tried any of these alterations to your motor?
>
> Eric
> 1964 Crown Coupe
> __________________________________________________________________
> Btw, if you need any further information about the LPG  conversion please
> let me know.
>
>
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