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PostPosted: Fri Jun 30, 2017 8:26 pm 
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Joined: Thu Apr 11, 2013 9:39 am
Posts: 12
Hello,
my old car (lpg), 207SW is getting a bit old (120kmiles) and I was thinking about upgrading it to something more comfortable for the long drives I do on motorways.
My idea was to get a large engine (above 2.5L) and convert to LPG to be able to drive economically with a decent torque.
My candidates are:
Jags XF 3L
Mercs CL or CLS 5L or possibly 3.5L
Lexus is250

Any suggestion/recommendation?
Thanks!


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PostPosted: Sun Jul 02, 2017 2:55 pm 
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Joined: Wed Sep 29, 2010 5:01 pm
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Location: Yorkshire
Just whichever car you'd prefer to own from that shortlist...

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PostPosted: Mon Jul 03, 2017 6:42 am 
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Joined: Thu Apr 11, 2013 9:39 am
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thanks Simon
even the lexus?

Do they require valve saver or they can do with petrol contribution?

I will start looking to sell my current car then, might be a few months...


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PostPosted: Mon Jul 03, 2017 11:07 am 
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Joined: Wed Sep 29, 2010 5:01 pm
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Location: Yorkshire
Depends on the year of the Lexus, some Toyota (Lexus) V6's feature both port and direct injection, you wouldn't want an engine with direct injection. Considering you consider your current car with 120000 miles a bit old, it's likely that a Lexus engine a bit bigger than 2.5L (as per your wish list) would be a V6 and have direct injection but it depends on the vehicle year. As memory serves, Lexus V6's in saloons got direct injection around 2005 but some none saloons like RX300s didn't get direct injection, then after a few years they went back to port injection, then more recently back to direct.. You'd want to check on the specific model/year you were thinking of buying.

Lexus and Jag will need a valve lube.

None of the cars you mentioned will make for the easiest DIY conversion.

Simon

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Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
Mid Yorkshire
2 miles A1, 8 miles M62,
http://www.Lpgc.co.uk
Twitter https://twitter.com/AutogasSimon
07816237240


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PostPosted: Thu Jul 06, 2017 12:17 pm 
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Joined: Thu Apr 11, 2013 9:39 am
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Thanks Simon,
I think I can remove the lexus from that list.
I do approximately 120 miles a day and my car was converted by Tubbs. It went really well and never needed anything, not even valvesaver. I just change the filter every 25k miles and keep going.
It runs with the infamous prince engine, which is a BMW derived engine with VTi. While the car is going still great I have a few issue with it:

1) the prince engine, while being a 1.6L engine, has no torque. Nothing below 4k RPM. Its really slow in raking up RPM as well. Its slightly more snappy with petrol but not much.

2) the gearbox is not helping as its a 4 speed automatic. Its slow in dropping gears and it always tries to use a higher gear than it should.

3) the prince engine, like all these engines uses a ridiculous amount of oil. I have to top up half a litre every 1000-1500 miles. It has always been this way and there is plenty of ppl complaining about the same problem.

4) driving so much and doing lot of sedentary work I developed a nasty sciatica. the seats of my car completely lack lumbar support and has a small range of adjustment. I use a lumbar pillow but it is not magic. I would really like to have heated seats at least in winter..

In short I'd like a good comfortable car that would allow me to travel to work in happiness, return decent "equivalent mileage" with LPG, have a good torque and a nice engine.
I recently saw also the BMW series 7 (2008-2009 ish) that looks great and is relatively cheap..I'd prefer a car that doesn't need valvesaver in principle or that can do with petrol contrib.
I do not really believe in valvesavers, there is no real technical reason for them to provide any protection to the exhaust valves as they should burn up completely during the expansion cycle. If they "accelerate" the flame front of the LPG in order to protect the exhaust valves then I see no reason why petrol contrib wouldn't do the same.

Im not planning a DIY conversion


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PostPosted: Sun Jul 09, 2017 3:45 pm 
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Joined: Fri Oct 21, 2005 7:56 pm
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Location: North Wales
Valve saver does work and is proven however I would agree with you that given the choice go for an engine that does not need it. I am not a Merc guy but am always impressed with the ones I have converted. For me it would be a choice between a merc and Lexus.

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