Can VVt-I be deleted?

[cowboy bebop]

Hi guys,

Here's my question of the day. Can VVt-I be deleted by using a non VVt-I block with VVt-I heads? Then, we could custom grind cams to give us the higher lift full time.

Is there anything stopping us from doing this, other than lack of cams?

Thanks guys,

Eric

 

[Zuffen]

VVTi doesn't change the lift of the cams. It only changes the relative timing between the exhaust and inlet cams.

At this stage there are no blanks for VVTi cams as the drive between them is in a different location.

Given that the 1UZ family of engine may be phased out due to the new 4.6 litre engine you may never see VVTi cams become available. You could regind the cams to a smaller base circle and use longer 2J valves.

 

[cowboy bebop]

What I was thinking as far as the cams, was to take them to Crane Cams and talk with them about regrinding. I have a custom "one off" set of cams from them on my Supra.

What I am thiniking, to keep costs reasonable, is to use a pre '98 1uz block. That will not provide an oil passage for the VVt-I, but with custom cams, we can overcome that. If we use VVt-I heads, we get the [visually] better flowing head, and COP's already installed for not much more cost than a non VVt-I head.

So would it be possible to run a non VVt-I bottom end (to delete the VVt-I), and the VVt-I heads?

Eric

 

[turboandrew]

I think if you used the tundra cams and gears it would work. Honestly I think the vvti setup will work, too, but the default cam timing may be way off. You'll have to probably degree the cams, which you may have done anyway if you are getting custom grinds.

But why not the best of both worlds? If you have vvti heads, wouldn't you have the block, too? I am pretty confident the AEM will control the vvti. And just think, custom ground vvti cams!

That being said, I will start with a 2UZ, non-vvti first. I hope to move the 98+ 1uz with vvti soon after.

 

[TundraEddie]

AFAIK,the Scranton's previous V8 setup used a 2UZ block with VVTi 1UZ heads wth deletes. If you look at photos of the engine the valve covers looked like the VVTi ones.

 

[Toysrme]

I'm with Zuffen. VVTL-i, you'd have a problem. vvt-i it's all gravy. In all honesty, the cam selection people you're talking to oughta be able to at least figure out a profile that will work well at the two basic vvt settings. 0*& 15* camshaft rotational advance.

I wouldn't be comfortable with a machine shop that blew me off saying, oh well that engine can varry it's valve timing, and we can't do enough damn math to figure out what profile would have overall good results. wtf. LoL! Figure out 0* so it idles OK, figure out 15* so it's good when you nail the gas, if they want, they can figure out a few points in between.

It's not *that* complicated.



Keep vvt-i if you have it, find better people to make cams.