LPG Discussion Forum

Hi All,

In 2002 I converted our 3.8 MkII Jaguar to LPG after finding it would only do 17mpg on petrol and only a slight improvement to 22 mpg with another distributor.

I had intended to do at least 5000 mile a year in it but of late it has only been 1200 and occasionally 3000 on holiday but could ...

His might be of use to someone with an oldschool gas system.

I have a 3.8 XK engined Jaguar that ran with a distributor tuned to the car, warm days it would start on gas but not in the winter. I fitted an aftermarket ECU and wrote two maps, one each for petrol and gas (with advise from a good ...

Hi,

I have a 3.8 MkII Jaguar and put it on the rollers a few years ago, on petrol then on lpg, it lost one bhp on LPG.

Brian

Can I just add a little to this post, I have a MY2000 3ltr maual S type Jaguar which still runs on petrol.

The fuel tank is effectively a saddle tank, it goes up and over the propshaft so at low levels there is effectively two tanks. The drivers side of the tank contains the fuel pump and its own ...

Hi Steve,

I'm assuming they are the later round centre with a round badge on it? If you would like to PPM me with a an email address and a contact phone number plus what you want for it, then I can advertize it with on the Jaguar forum for you. If we exchange email addresses and a picture it will ...

Hi Simon,

That was a reply to Steve (oldskool) about addatives.

I'm begining to think even if I could get the carbs tuned accurately (some hope) it would still be too rich and soot up. The old saying of carbs throw petrol in with a bucket and injectors use a metered syring comes to mind. Even Our ...

Hi Simon and Steve,

All our old cars have unleaded heads so run on 98 octane petrol, so no addatives to upset things.

I have been visiting our local yards for the last 40 years, and make a point of chatting to the owners. Many is the time I've gone in for a pile of plastic or rubber bits to told ...

Gilbert and Steve,

Thanks for the replys, I think the sensor you refered to is NTK OZA659-EE76 1670, our early MkII has two 3 into 1 cast iron manifolds (angled back) and the sensor is in the down pipe just after the bend.

Simon,

I've looked at pictures on the NTK site and my old dead sensors ...

Hi,

I have asked a few questions in the past for which you have been very helpful, this is a general question so look forward to your replys.

I have a 3.8 ltr MkII Jaguar running on LPG for over 10 years (replaced the gas tank a few years ago for the certificate and rebuilt the vaporiser), it has ...

That sounds like a simple and brilliant idea.

Brian

To the left or right of the carb throat (on an HS type SU carb) is a small pin that you can push up and it will lift the piston and so the needle, to test if the engine is running weak or rich. Is this what you are refering to?

There are various types of SU's H (very old) HS (roughly 70's) HD ...

I've just seen this old post of mine resurrected for some reason!

To update you on the car, I built it with two fuel systems and two ignition systems for reliability and alternatives when touring, UK or Europe.

The car has been running very well after a few more changes, I fitted a set of iridium ...

I'm happy to own/drive anything that isn't new (can't see the reason to give money away) and has cheap parts, having said that I've got two old Jaguars, and a Marina rebuilt from what ever I find in the scrapyards.

Brian

Thankyou for your replies,

Classicswede, I'll pass your post onto my friend.

Thanks
Brian

Hi,

No replies so far.

Not sure if i've not given enough detail or there no one nearby, does anyone specialise in these systems?

Best wishes.

Brian

Hi,

You have been very helpful to me in setting up my leanardo single point system on my old jaguar, I'm hoping you can point me in the right direction concerning a friends car.

He has an estate version of a volvo S40, 4 cylinder engine fitted from the factory with a Necam LPG system. I can see a ...

As an apprentice in the 60's I had to take over from the guy who drilled the chrome moly van headers for tubes to be welded in ........with a 1.5" HSS drill. The trick was to keep cutting and not let it slip as this surface hardened the steel header.

Slow speed and a steady feed is essential. I ...

I've always shut the manual valve on the tank as it says in the bump when going onto the ferry.

Brian

Hi,

I have a single point system run from a Lambda sensor, a little while back I replaced it with a cheapo sensor which didn't last a year.

From friends in a scrap yard I got about 5 either Bosch or NTK and tested them over the same route, the Bosch seemed to close in the stepper motor more than ...

Hi Will,

David Hampshire of CANEMS has built an ECU for his brothers car (Capri with a vauxhall 3 ltr V6) that controls petrol EFI and LPG, set up from the laptop. I've driven the car and it went very well.

Brian