LC100.4.5/gas coversion,pros/cons.

Submitted: Thursday, Jun 08, 2006 at 21:09
ThreadID: 34747 Views:1778 Replies:3 FollowUps:2
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Hi,everyone.Pros/Cons of 4.5.petrol,LC100 on gas? I here toyota engines are not as gas friendly as others.I have been told the head won't last more than 3 years. The mechanic advised,$2800 for gas kit fitted,3 years later $3000 to replace head. His advise was stick with petrol.You will never be in front. I travel around 20000kms or so a year.I would be grateful for long term users opinions and suggestions. Thanks in advance...

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Reply By: SimonW - Thursday, Jun 08, 2006 at 21:25

Thursday, Jun 08, 2006 at 21:25
Hi Bobthe,
I cannot comment on the 4.5lt but I ran a 4.0lt FJ75 on gas/petrol for 11 years & hammered the hell out of it & never experiance any head related issues after 230,00km. So all I can say is "not all toyota aren't gas friendly".
Cheers Simon.
AnswerID: 177535

Follow Up By: Bobthe... - Thursday, Jun 08, 2006 at 21:36

Thursday, Jun 08, 2006 at 21:36
FollowupID: 433659

Reply By: awill4x4 - Thursday, Jun 08, 2006 at 22:19

Thursday, Jun 08, 2006 at 22:19
One of the guys next door at work (LPG fitter by coincidence) has a 94 80 series 4.5 litre the last 250,000 kms on LPG. It has done over 300,000 kms since new. He feels the head may need some TLC at some stage but it's not critical yet and with the money he's saved he's waaaaaaay in front.
Regards Andrew.
ps: No valve saver lubricant on his Cruiser either.
AnswerID: 177553

Reply By: Beast of Bodmin - Thursday, Jun 08, 2006 at 23:00

Thursday, Jun 08, 2006 at 23:00
If you take a trawl through the recent archive, you'll notice my threads on the lpg head replacement l've just done.

Basically - The 4.5 1FZFE has soft valve seats. Mine has a 10yr old lpg kit and 330,000km. No more valve clearance available, so left with the choice of bodging, aka valve stem grind or grinding shims to suit.

I went the brand new genuine casting route and fitted it with hard seats and all the gear but re-used my cams. All told l expect it was close to a $5k job. And l did all the on vehicle work myself!

If this was 12mths ago, l would have not worried about fuel prices and ran ULP/PULP only. Now, lpg is a must. Therefore on this basis it will pay for itself quickly.

I heard different stories about oil feeds into the upper cyl but settled on staying without the kit as l have been convinced they cause a build up of carbon and stop proper heat disipation of the valve into the valve seat.

Hope this helps.
AnswerID: 177564

Follow Up By: Bobthe... - Friday, Jun 09, 2006 at 19:45

Friday, Jun 09, 2006 at 19:45
I appreciate your feedback beast of bodmin.what are the dates of your posts please?
FollowupID: 433857

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