Toyota 1.6 vvt-i

[kompressor]

Hello! Does anyone as that engine running on LPG? And the valves? Are there good to go? Buy the way the car was made in 2004! Thank's!

[Tsipouro]

I got Zavoli kit installed in my Toyota Corolla 1.4 VVT-i (2003). No flash lube.
I think its the same engine as in 2004.
I've done 4500 kilometers so far without any problem but its too soon say make conclusions.
I am planning to go for valve gap check soon...

[lpgtips]

I've done 4500 kilometers so far without any problem but its too soon say make conclusions.
I am planning to go for valve gap check soon...

Keep us posted! I've got a 1.6 vvti and will be interested to know if there's any damage without a Flashlube.

[Tsipouro]

I will keep you posted
But do read the following article, I kinda agree in most of the "information" that it contains:



http://www.go-lpg.co.uk/VSR.html
http://www.go-lpg.co.uk/

[tommo2009]

I would recommend the valve saver on that engine, most Jap engines require it. Seems to be the wrong way around finding out if it does need it, as valve saver wont fix the problem should it start. It is a preventative measure not a cure.
I would put the valve saver syetm on now rather than later.

[lpgtips]

I will keep you posted
But do read the following article, I kinda agree in most of the "information" that it contains:

Thanks for the interesting read. Have you checked if the 4ZZ-FE engine has soft or hard valves?

The one "weakness" of the vvti engine I can see is that at lower revs it switches back to 2 valves (isn't this what variable valve timing means?), causing Brinelling on the valves. On the "positive" side - this would happen regardless of the type of fuel used, be it LPG or petrol and I hope the Toyota engineers have done something about that (like hardening the valves).

[Tsipouro]

All the 4 valves of each cylinder work all the time no matter the rpms of the engine. VVT-i just controls the timing of the intake and exhaust valves. The VVT-i system uses a gear in the camshaft that is able to change the phase between the two camshafts depending on the rpms of the engine. Changing the phase of the two camshafts means that the timing changes -> Variable Timing
If you want to learn the exact way that the VVT-i gear changes the phase just make a search in the net. In out model it uses oil pressure provided through an electrically controlled valve.

[lpgtips]

All the 4 valves of each cylinder work all the time no matter the rpms of the engine. VVT-i just controls the timing of the intake and exhaust valves. The VVT-i system uses a gear in the camshaft that is able to change the phase between the two camshafts depending on the rpms of the engine. Changing the phase of the two camshafts means that the timing changes -> Variable Timing
If you want to learn the exact way that the VVT-i gear changes the phase just make a search in the net. In out model it uses oil pressure provided through an electrically controlled valve.

What's your mpg like? Does it drop a lot with the lpg?

[billynoband]

The general idea on this forum now seems to be most jap engines need flashlube and any engine 2004 and newer does too. My outlander had almost no valve clearance left after 30k and tickover was hunting, I fitted Flashlube and another 30k later tickover is still ok so I would say it works. It needs constant adjustment though and my engine light comes on if the flow is too high say during hot weather when the lube becomes very thin.

[Tsipouro]

What's your mpg like? Does it drop a lot with the lpg?

With unleaded fuel (95) i used to have consumption between 5,8-6,8 litres per 100kilometeres
Now with the LPG the consumption is 13-15% increased and this is normal. If your consumption with LPG isn't at least 10% increased compared to the one you had with the unleaded fuel then something isnt properly adjusted in your kit and needs to be checked.

@Billynoband: I have friends with toyota corolla running on LPG for more than 50.000 kilometers and they didn't experience any problem yet with their valve clearances. My general assumption is that valve and valve seat problems occur due to improper kit adjustment after installation, wrong mixture analogies, wrong ignition advance, and engine use in high rpms for long time

[Tsipouro]

Keep us posted! I've got a 1.6 vvti and will be interested to know if there's any damage without a Flashlube.

Before installing the LPG kit I've checked the valve clearance on every valve so that I could make the comparisons with the future checks that I would do after running on LPG.
I don't use flashlube because I just dont think I need it. My LPG Kit was installed properly and checked twice. The consumption is increased by 12-15% compared to the one that I had when running on unleaded.

After running my engine for 21,000 kilometers on LPG I decided to check the valves (clearance) and I just confirmed what I was expecting to see. The clearance was exactly the same as before the 21,000km.
I plan to do again that check in about 20.000km. I will be happy to keep you informed....