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LPG Conversion - No good on V8?

 
 
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monty
Gate Opener


Joined: 06 Mar 2006
Odometer: 49




PostPosted: Thu Feb 14, 2008 9:05 pm    Post subject: LPG Conversion - No good on V8? Reply with quote

Just had my Defender 90 MOT'd. It's a 1987 V8 but with a very low mileage and in bob on condition. The original SUs have been replaced with a four barrel edelbrock. I told the mechanic that I was going to fit a diy LPG conversion kit and he said it wasn't worth it. LPG doesn't work well on V8s, poor performance, poor consumption, reduced torque etc etc. I got the impression he had a real downer on LPG. I was going to fit a kit from Tinley Tech. Does anyone have any experience of such a conversion?
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Nathaniel
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Joined: 13 May 2003
Odometer: 17901
Location: North, North Yorkshire


1979 Suzuki LJ

PostPosted: Thu Feb 14, 2008 10:28 pm    Post subject: Reply with quote

********, there are HUNDEREDS of Rover V8's out there running LPG.
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Nat

If You Open Your Mind Too Much Your Brain Will Fall Out
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bluesj
Off-Road Guru


Joined: 06 Feb 2006
Odometer: 1045
Location: East Sussex



PostPosted: Fri Feb 15, 2008 7:18 am    Post subject: Reply with quote

There can be one of two small problems to over come but mostly with Efi engines, one thing you should fit is a dual timing ignition amp.
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The early bird may get the worm, but the second mouse gets the cheese
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Rossko
Articulating


Joined: 23 Jan 2007
Odometer: 757




PostPosted: Fri Feb 15, 2008 7:41 pm    Post subject: Reply with quote

Well, you'll get lots of opinions Smile

I for one wouldn't bother with timing advance gadgets, its just something else to go wrong (seen plenty of broken ones) for barely measurable benefits.

Like ee said, there are thousands out there. Most perform well, and are cheap to run. A few are horrors - bodged or unsuitable installations. Be aware that gas can show up issues - a V8 with cross-firing ignition leads may run rough on petrol but backfire on gas. Bystanders would blame the gas but really the ignition leads are duff. Best results with a good unknackered engine and a tip-tip ignition system.

It's important to get something suitable. In your case the usual LPG gubbins for twin SU or stromberg clearly won't fit. You'll need mixer(s) to suit both the carbs and the engine power output - it has to physically fit and to have the right airflow characteristics. Make very sure your supplier understands what you have or you'll never be happy with the results.

Before you go down any DIY route consult your insurers, I expect you've already done that for the other mods, but for LPG they may require certification.

cheers, Ross K

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Cruiser
Just got MTs


Joined: 09 Nov 2006
Odometer: 168
Location: Staffordshire



PostPosted: Fri Feb 15, 2008 8:07 pm    Post subject: Reply with quote

I would suspect that the Rover V8 is probably THE most converted engine in the world to run on LPG. They are smooth on petrol and even smoother on LPG. I've been running V8's on gas for years and what Rossko says is dead right. Most faults are not with the LPG system but with the ignition which is more critical when on LPG. I have never bothered with an advance module, just advanced the timing to the onset of pinking when on petrol then backed it off a fraction.

The MoT mechanic was talking out of his ****!!!
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stushine
Gate Opener


Joined: 07 Mar 2008
Odometer: 6




PostPosted: Fri Mar 07, 2008 11:49 am    Post subject: Re: LPG Conversion - No good on V8? Reply with quote

monty wrote:
Just had my Defender 90 MOT'd. It's a 1987 V8 but with a very low mileage and in bob on condition. The original SUs have been replaced with a four barrel edelbrock. I told the mechanic that I was going to fit a diy LPG conversion kit and he said it wasn't worth it. LPG doesn't work well on V8s, poor performance, poor consumption, reduced torque etc etc. I got the impression he had a real downer on LPG. I was going to fit a kit from Tinley Tech. Does anyone have any experience of such a conversion?


i converted mine using the tinley tech conversion, took me a couple of days start to finish, very simple to fit and wire, ive noticed no difference in performance etc, and also definatly saving money already! not had mine tuned up yet and its runing nice!
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(Gray)
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PostPosted: Fri Mar 07, 2008 12:06 pm    Post subject: Reply with quote

Cynical me thinks the MoT chappie doesn't like LPG 'cos it's less likely to fail the emissions test, and therefore a potential loss of earnings spending 30 mins tweaking the fuel/timing settings and cleaning the air filter etc.....
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stushine
Gate Opener


Joined: 07 Mar 2008
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PostPosted: Fri Mar 07, 2008 1:57 pm    Post subject: Reply with quote

(Gray) wrote:
Cynical me thinks the MoT chappie doesn't like LPG 'cos it's less likely to fail the emissions test, and therefore a potential loss of earnings spending 30 mins tweaking the fuel/timing settings and cleaning the air filter etc.....


dont think a 1987 landy would have a emissions test for MOT, i think its only vehicles after 1991 that need emissions tested..?

i certainly wouldnt take any notice of him tho, sounds like he was a bit of an idiot
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(Gray)
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PostPosted: Fri Mar 07, 2008 7:26 pm    Post subject: Reply with quote

stushine wrote:
(Gray) wrote:
Cynical me thinks the MoT chappie doesn't like LPG 'cos it's less likely to fail the emissions test, and therefore a potential loss of earnings spending 30 mins tweaking the fuel/timing settings and cleaning the air filter etc.....


dont think a 1987 landy would have a emissions test for MOT, i think its only vehicles after 1991 that need emissions tested..?

i certainly wouldnt take any notice of him tho, sounds like he was a bit of an idiot


This site shows the limits of emissions for vehicles first used on or after 1975.

Interestingly, the emissions tests use the standard of either the age of the vehicle or the age of the engine, whichever is older.
eg you buy my 1974 engine and put it in a brand new vehicle, the tests are visual only. (the onus is on you to prove the age of the engine)
Similarly, I buy a brand new 2008 engine and put it in my 1974 LR, it's still only a visual test.
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the bey
Just got MTs


Joined: 16 Feb 2008
Odometer: 137
Location: SOUTH WALES, ie gods country!


1990 Land Rover Defender

PostPosted: Sat Mar 08, 2008 6:40 pm    Post subject: v8 on gas Reply with quote

i have a v8 on gas and it runs every bit as good on gas as it does on petrol! i recommend it! very economical to run!
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how do you know if you dont try!!
the bey aka "12 bore beynon"
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