http://www.lextreme.com/forums/3uzfe.pdf


No one really knows about these Toyota V8 they came in 4 runners and lexus ls400 and sc400 but they where no good use cause of there transmissions.

I heard that toyota spent 300 million on R&D for the 3uzfe engine its a 4.3liter V8 VTC on both intake cams and VVT.

These engines have tons of potential and there a dime a dozen, (3uzfe can be found for 6k)






Heres another guy who put his in a 240.

he was on 205 60 15 and ran 13.8 1/4 with a 60fty time of 1.8secs .




http://lextreme.com/forums/index.php?

 

Its a good read, but VVT-i isn't like VTEC. Its cam phasing and that's really cool (especially on V8's) but they don't have a secondary camshaft lobe. If it was VVTL-i, then it would be basically the same as i-VTEC (dual cam profiles and cam phasing)

Badass V8's none-the-less.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by notstock93 &raquo;</TD></TR><TR><TD CLASS="quote">Its a good read, but VVT-i isn't like VTEC. Its cam phasing and that's really cool (especially on V8's) but they don't have a secondary camshaft lobe. If it was VVTL-i, then it would be basically the same as i-VTEC (dual cam profiles and cam phasing)

Badass V8's none-the-less.</TD></TR></TABLE>

You right and wrong about the VVT (which is not with cam phasing (VVT-i is with cam phasing) just has a low end lobe and a highend lobe it lacks that midrange lobe like what vtec has .

But still its a V8 with such devices dont forget the forged crank it comes with !


http://www.alflash.narod.ru/vvt.htm

http://www.lextreme.com/forums/3uzfe.pdf




Modified by MidShipCivic at 9:10 PM 1/24/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">

You right and wrong about the VVT (which is not with cam phasing (VVT-i is with cam phasing) just has a low end lobe and a highend lobe it lacks that midrange lobe like what vtec has .
Modified by MidShipCivic at 9:10 PM 1/24/2005</TD></TR></TABLE>

Didn't I just get done saying that VVT-i had cam phasing? VTEC doesn't have a mid-range lobe profile (at least not B-series VTEC) it has two low end lobes to promote intake air swirl for better combustion by opening the valves at different times.

On the site you listed, it says that VVT-i is only the cam phasing, and the VVL (variable valve lift, abbreviated by "L" in VVTL-i) is the system with the secondary cam profile.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by notstock93 &raquo;</TD></TR><TR><TD CLASS="quote">

VTEC doesn't have a mid-range lobe profile (at least not B-series VTEC) it has two low end lobes to promote intake air swirl for better combustion by opening the valves at different times.

</TD></TR></TABLE>

Isn't swirl determined by the surfaces of the environment the air is rushing into?

Can you explain why it promotes swirl? I could have sworn it had something to do with the airspeed and trapping cylinder pressure effectively.

The 2 low rpm cams in VTEC arent the same lift and duration. Its a midrange lobe it has a slightly higher lift. Look at look at b-series camshaft spec. http://www.compcams.com/catalog/192_193.html see that 3 different lifts and durations?

VVT-i is 2 different lobes for low and high if it was cam phasing only why put the VVT- then I? Ever thought about that?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nonstock &raquo;</TD></TR><TR><TD CLASS="quote">On the site you listed, it says that VVT-i is only the cam phasing, and the VVL (variable valve lift, abbreviated by "L" in VVTL-i) is the system with the secondary cam profile.
</TD></TR></TABLE>

The L in VVTL completely copies what Honda does by by having 3 different lifts and dura.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">The VVL portion of the system incorporating <FONT COLOR="red"> two distinct cam profiles. </FONT> However, the actual mechanism is quite different. Both cam lobes operate a single wide rocker arm that acts on both intake or both exhaust valves. A needle-bearing roller on the arm follows the low-rpm, short-duration, low-lift lobe, forcing both valves to open and close on that profile. The roller design and roller bearings on the rocker arm pivot help to minimize valvetrain friction. The high-rpm, higher-duration, longer-lift lobe rubs on a hardened steel slipper follower mounted to the rocker arm with a spring. Even though the high-rpm lobe is pushing down further than the low-rpm lobe, the spring absorbs the extra movement. At 6000rpm, the ECU sends a signal to an oil control valve at the end of the camshaft that puts oil pressure behind a lock pin in the rocker arm, sliding the pin under the spring-loaded slipper follower, locking it to the rocker arm and forcing the arm to follow the high-rpm cam profile.
</TD></TR></TABLE>


VVTL camshaft


Just like a vtec cam

VVL

 

Am i the only one who sees the chevy v8 and not toyota v8 in the tube frame chassis? It looks great, but its not a toyota engine!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ek99 &raquo;</TD></TR><TR><TD CLASS="quote">Am i the only one who sees the chevy v8 and not toyota v8 in the tube frame chassis? It looks great, but its not a toyota engine!!</TD></TR></TABLE>

Looks like a Ls1? With a truck tranny?

 

Yeah, LS1 but with a porsche tranny.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">

Can you explain why it promotes swirl? I could have sworn it had something to do with the airspeed and trapping cylinder pressure effectively.

The 2 low rpm cams in VTEC arent the same lift and duration. Its a midrange lobe it has a slightly higher lift. Look at look at b-series camshaft spec. http://www.compcams.com/catalog/192_193.html see that 3 different lifts and durations?
</TD></TR></TABLE>

its possible to create swirl from two different airflows from slightly different valve timing (from different lobe lift and duration on each one fo the intake and exhuast valve) ... one valve flows more air while the other has slightly less ramp rate ...

 

Alright, I give up. You're right, im wrong. Im not going to spell it out for you, the camshafts for the VVT-i are not "low end" and "high end". They are different sizes, yes, but not for upper RPM breathing, its for air management in relation to swirling of incoming air. Think of opening a door when its cold inside and hot outside, the air rushes through the doorway. now think of opening two doors at different intervals to promote swirling. These doors are the cam lobes and the intervals are the cam profiles.

As for the VVL cam shaft differences to the VVTL-i camshafts, they DO have have different cam profiles (and this time, yes, one is for high end, one is for low end). Thats what I've been saying.

Just so everyone is clear-

VVL/VVTL-i : two cam profiles for higher and lower RPM power.

VVT-i- two cam profiles to promote swirling (just like the low profile lobes on a VTEC cam) but not to promote upper RPM power.


The V8 you posted DOES NOT have the VVL or VVTL-i. It has VVT-i only.

 

(its an LS1 engine I'm just sayin they also do toyota engines with those)

I'm not trying to be a smartass or anything.

Toyota does not have a VVL notstock.


The celica does have VVT engine (beside from the top model GTS VVTL-i) is all about top end notstock. Why wouldn't it be ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">(its an LS1 engine I'm just sayin they also do toyota engines with those)

I'm not trying to be a smartass or anything.

Toyota does not have a VVL notstock.


The celica does have VVT engine (beside from the top model GTS VVTL-i) is all about top end notstock. Why wouldn't it be ?</TD></TR></TABLE>

I have no idea what you just said.

Regardless, the celica is a high RPM motor becuase of its very nature (small 4 cyl.)