E
ed_ma61
Guest
though some of you folks might be interested in this, full article and pics currently at:
http://www.v-eight.com
cheers
ed
The 1UZFE EGR Delete Kit is available for sale here.
though some of you folks might be interested in this, full article and pics currently at:
http://www.v-eight.com
cheers
ed
[/size][/font][font=Arial,Helvetica][size=-1]Basically, it varies the valve timing by shifting the phase angle of camshafts. For example, at high speed, the inlet camshaft will be rotated in advance by 30° so to enable earlier intake. This movement is controlled by engine management system according to need, and actuated by hydraulic valve gears.[/size][/font]
[font=Arial,Helvetica][size=-1] [/size][/font]
[font=Arial,Helvetica][size=-1]Note that cam-phasing VVT cannot vary the duration of valve opening. It just allows earlier or later valve opening. Earlier open results in earlier close, of course. It also cannot vary the valve lift, unlike cam-changing VVT. However, cam-phasing VVT is the simplest and cheapest form of VVT because each camshaft needs only one hydraulic phasing actuator, unlike other systems that employ individual mechanism for every cylinder.[/size][/font]
It'd be reasonably easy to determine piston/valve clearance on the setup. If I recall correctly, 25 degrees is roughly 4 cam teeth(28 degrees).
Although, a very good caveat for anyone wanting larger cams for these motors.
I like my 1uz VVT-I IS300, she's quite a nasty little beast out on the road.
-B
though some of you folks might be interested in this, full article and pics currently at:
http://www.v-eight.com
cheers
ed
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ed_ma61
Guest
nah, not really. more a passive diffusion of links 
but seriously, i just figured this vvti sh1t out today, and am pretty happy with what justin and i found. 52deg at the crank!! hell yeah...
the heads are currently in melb at mark florrimals workshop, and once i get the flow figures bac off the bench, i need to talk to kelford again about cams. knowing what the vvti does is going to have a big impact on profile design
but seriously, i just figured this vvti sh1t out today, and am pretty happy with what justin and i found. 52deg at the crank!! hell yeah...
the heads are currently in melb at mark florrimals workshop, and once i get the flow figures bac off the bench, i need to talk to kelford again about cams. knowing what the vvti does is going to have a big impact on profile design
E
ed_ma61
Guest
not for the stock intake and cams sorry. and the autronic will not be tuned for the new cams and heads for atleast a few months yet 
rivmasta
New Member
If poss I'd like to get a couple of clarifications/questions on that tech article.
1 - the VVT definatly only changes the centrelines of the intakes only.
2 - does the VVT retard or advance the intake by 25-26 deg at the cam? (Im assuming it retards)
3 - On the 20v toyota there are two types of VVT - the early one that is a on/off switch based on RPM, the other that is load balancing so that the cam is basically always in the position to make the most power dependant on load. Which version is the later 1UZ?
4 - These came from a 98 or later 1UZ I believe, is there a different engine type number or something that I could easily differentiate the the non vvt and the vvt versions when calling importers
5 - whats the compression ratio of a 1963 beetle
6 - does anyone have the standard specs for these cams (Ive searched here and cant find them)
7 - are there any other major mods between the vvt and non vvt engines such as comp ratio, bore or stroke, chamber cc, valve size or springs etc
8 - are the blocks the same? specifically engine mounts and gearbox bolt patterns
9 - finally, is there a price difference between the two motors (Im assuming there is) and if so, anyone got a ballpark of how much?
Cheers!
Riv.
1 - the VVT definatly only changes the centrelines of the intakes only.
2 - does the VVT retard or advance the intake by 25-26 deg at the cam? (Im assuming it retards)
3 - On the 20v toyota there are two types of VVT - the early one that is a on/off switch based on RPM, the other that is load balancing so that the cam is basically always in the position to make the most power dependant on load. Which version is the later 1UZ?
4 - These came from a 98 or later 1UZ I believe, is there a different engine type number or something that I could easily differentiate the the non vvt and the vvt versions when calling importers
5 - whats the compression ratio of a 1963 beetle
6 - does anyone have the standard specs for these cams (Ive searched here and cant find them)
7 - are there any other major mods between the vvt and non vvt engines such as comp ratio, bore or stroke, chamber cc, valve size or springs etc
8 - are the blocks the same? specifically engine mounts and gearbox bolt patterns
9 - finally, is there a price difference between the two motors (Im assuming there is) and if so, anyone got a ballpark of how much?
Cheers!
Riv.
Peewee
New Member
Riv,
first off, there are 3 types of Toyota VVT
a - VVT, this is on/off, two position, full advance, full retard, nothing in between.
Silvertop 20V 4AGE's definately have this, and I was under the impression that the blacktop 20V 4AGE was the same.
b - VVTi, this is fully variable between full advance and full retard, depending on the signal it receives.
c- VVTL-i, this is VVTi with a LIFT change at a certain RPM. This lift is on/off, not variable, but the cam timing is variable.
Now, to answer your questions.
1) If you mean does it have lift, no.
2) I'll wait for ed to clarify what it does
3) 98+ 1UZ and 3UZ are VVTi
4) Importers will know a VVTi 1UZ, it has a VERY different intake manifold
5) ??
6) no idea
7) I'll let ed field that one
8) yes, identical (or close enough)
9) yes, several thousand.
first off, there are 3 types of Toyota VVT
a - VVT, this is on/off, two position, full advance, full retard, nothing in between.
Silvertop 20V 4AGE's definately have this, and I was under the impression that the blacktop 20V 4AGE was the same.
b - VVTi, this is fully variable between full advance and full retard, depending on the signal it receives.
c- VVTL-i, this is VVTi with a LIFT change at a certain RPM. This lift is on/off, not variable, but the cam timing is variable.
Now, to answer your questions.
1) If you mean does it have lift, no.
2) I'll wait for ed to clarify what it does
3) 98+ 1UZ and 3UZ are VVTi
4) Importers will know a VVTi 1UZ, it has a VERY different intake manifold
5) ??
6) no idea
7) I'll let ed field that one
8) yes, identical (or close enough)
9) yes, several thousand.
rivmasta
New Member
Cheers Peewee - vvt vs vvti vs vvtli thats gold, thanks. I always knew they existed, never knew that these codes differentiated them.
Blacktop 20v would def be vvti version, its run off MAP instead of TPS for this reason. Im racing with a silvertop (painted black to confuse others) with a blacktop set of quads... cant afford the motec to run the cam, hence the silvertop.
Which means that if the 1UZ is vvti then I need a motec to run it and my EMS cant do the job...
Oh well, non vvt for me! Still, Im very interested in learning as much as poss about all lexus v8's so if the other q's get answered, all the better!
Re Ques 1 - I actually want the fact that the vvt only contols the intake cam, the exhaust cam stays at the same centreline, oblivious to the intake.
Blacktop 20v would def be vvti version, its run off MAP instead of TPS for this reason. Im racing with a silvertop (painted black to confuse others) with a blacktop set of quads... cant afford the motec to run the cam, hence the silvertop.
Which means that if the 1UZ is vvti then I need a motec to run it and my EMS cant do the job...
Oh well, non vvt for me! Still, Im very interested in learning as much as poss about all lexus v8's so if the other q's get answered, all the better!
Re Ques 1 - I actually want the fact that the vvt only contols the intake cam, the exhaust cam stays at the same centreline, oblivious to the intake.
MWP
New Member
So are you going to have cams made ed, or the stock ones modifed?
I can see having new cams made will be incredibly expensive.
I like where you are going with this engine though... pretty much exactly what i would want to do with mine in the RA28 (when i get it done).
A screaming NA V8.
I can see having new cams made will be incredibly expensive.
I like where you are going with this engine though... pretty much exactly what i would want to do with mine in the RA28 (when i get it done).
A screaming NA V8.
E
ed_ma61
Guest
If poss I'd like to get a couple of clarifications/questions on that tech article.
1 - the VVT definatly only changes the centrelines of the intakes only.
YES - the timing belt drives the cam gear on the VVTi mech which itself is fixed to and drives the scissor gear and hence exhaust cam. the intake cam is then advanced and retarded independantly from this
2 - does the VVT retard or advance the intake by 25-26 deg at the cam? (Im assuming it retards)
i dont know - ill have to check
3 - On the 20v toyota there are two types of VVT - the early one that is a on/off switch based on RPM, the other that is load balancing so that the cam is basically always in the position to make the most power dependant on load. Which version is the later 1UZ?
peewee did a good job of answering this. The 1uz is VVTi
4 - These came from a 98 or later 1UZ I believe, is there a different engine type number or something that I could easily differentiate the the non vvt and the vvt versions when calling importers
again, already answered. They should know - it looks completely different
5 - whats the compression ratio of a 1963 beetle
1963 Volkswagen 113 Beetle CR 7.5:1
http://www.conceptcarz.com/vehicle/z7533/Volkswagen_113 Beetle/default.aspx
6 - does anyone have the standard specs for these cams (Ive searched here and cant find them)
no, its currently unavailable. narrow and pointy is a good description. I will have the cams degreed inside of the next week or so.
7 - are there any other major mods between the vvt and non vvt engines such as comp ratio, bore or stroke, chamber cc, valve size or springs etc
engine is 10.5:1 stock, rods are skinnier, pistons are interference fit, valves are 5.5mm stem, SUB lifter assembly @31mm dia, VVTi obviously, coil on plug sequential ignition, different intake manifold, vertical valve ports (nice!)
8 - are the blocks the same? specifically engine mounts and gearbox bolt patterns
Yes
9 - finally, is there a price difference between the two motors (Im assuming there is) and if so, anyone got a ballpark of how much?
Engine and loom seems to be around the AUD$2000-2500 mark if and when you can find one! note: only motec and autronic offer ecus that can run the vvti.
1 - the VVT definatly only changes the centrelines of the intakes only.
YES - the timing belt drives the cam gear on the VVTi mech which itself is fixed to and drives the scissor gear and hence exhaust cam. the intake cam is then advanced and retarded independantly from this
2 - does the VVT retard or advance the intake by 25-26 deg at the cam? (Im assuming it retards)
i dont know - ill have to check
3 - On the 20v toyota there are two types of VVT - the early one that is a on/off switch based on RPM, the other that is load balancing so that the cam is basically always in the position to make the most power dependant on load. Which version is the later 1UZ?
peewee did a good job of answering this. The 1uz is VVTi
4 - These came from a 98 or later 1UZ I believe, is there a different engine type number or something that I could easily differentiate the the non vvt and the vvt versions when calling importers
again, already answered. They should know - it looks completely different
5 - whats the compression ratio of a 1963 beetle
1963 Volkswagen 113 Beetle CR 7.5:1
http://www.conceptcarz.com/vehicle/z7533/Volkswagen_113 Beetle/default.aspx
6 - does anyone have the standard specs for these cams (Ive searched here and cant find them)
no, its currently unavailable. narrow and pointy is a good description. I will have the cams degreed inside of the next week or so.
7 - are there any other major mods between the vvt and non vvt engines such as comp ratio, bore or stroke, chamber cc, valve size or springs etc
engine is 10.5:1 stock, rods are skinnier, pistons are interference fit, valves are 5.5mm stem, SUB lifter assembly @31mm dia, VVTi obviously, coil on plug sequential ignition, different intake manifold, vertical valve ports (nice!)
8 - are the blocks the same? specifically engine mounts and gearbox bolt patterns
Yes
9 - finally, is there a price difference between the two motors (Im assuming there is) and if so, anyone got a ballpark of how much?
Engine and loom seems to be around the AUD$2000-2500 mark if and when you can find one! note: only motec and autronic offer ecus that can run the vvti.
E
ed_ma61
Guest
getting the old one hardfaced and reground by kelford cam nzMWP said:
E
ed_ma61
Guest
[font=Arial,Helvetica][size=+2][/size][size=-1]rivmasta said:
[/size][/font][font=Arial,Helvetica][size=-1]Basically, it varies the valve timing by shifting the phase angle of camshafts. For example, at high speed, the inlet camshaft will be rotated in advance by 30° so to enable earlier intake. This movement is controlled by engine management system according to need, and actuated by hydraulic valve gears.[/size][/font]
[font=Arial,Helvetica][size=-1] [/size][/font]
[font=Arial,Helvetica][size=-1]Note that cam-phasing VVT cannot vary the duration of valve opening. It just allows earlier or later valve opening. Earlier open results in earlier close, of course. It also cannot vary the valve lift, unlike cam-changing VVT. However, cam-phasing VVT is the simplest and cheapest form of VVT because each camshaft needs only one hydraulic phasing actuator, unlike other systems that employ individual mechanism for every cylinder.[/size][/font]
E
ed_ma61
Guest
rimvista - original article updated to clarify the vvti mechanism on the intake cam for you
cheers
ed
cheers
ed
One thing to note. If you add lift to the cam etc. you will likely need to change the stops of the vvt or it will hit. I know on the Alfas 4cyl when the hot cams were used the vvt was welded. Then they found how to change them to not move so much and started to use them again. now they use a 2nd one added to the exhaust. As Alfa added the vvt as kinda a addon the parts can be made to work on ether cam or both. But with hot cams movment has to be limited a lot or else valves meet pistons in a bad way.
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ed_ma61
Guest
= custom pistons
Brad Bedell
New Member
Just some modeling clay to verify the clearance once done.ed_ma61 said:
It'd be reasonably easy to determine piston/valve clearance on the setup. If I recall correctly, 25 degrees is roughly 4 cam teeth(28 degrees).
Although, a very good caveat for anyone wanting larger cams for these motors.
I like my 1uz VVT-I IS300, she's quite a nasty little beast out on the road.
-B
BARRY
New Member
20v silvertop uses VVT which is a basic on and off cam phasing configuration. basically i think 15 degree's advanced or not.
20v blacktop uses VVTi which is variable depending on specific variables that the computer looks at. load, rpm, etc...
bill sherwood, http://www.billzilla.org has verified that BOTH silvertop and blacktop VVT actuators are the exact same part. He has even swapped the two and seen no differences in functionallity. Most standalones cannot control the mechanism correctly other than a 5v on and off signal. to control the actuator as OEM it is requred that your computer be able to vary the input voltage to accurately control cam timing phasing degree by degree.
20v blacktop uses VVTi which is variable depending on specific variables that the computer looks at. load, rpm, etc...
bill sherwood, http://www.billzilla.org has verified that BOTH silvertop and blacktop VVT actuators are the exact same part. He has even swapped the two and seen no differences in functionallity. Most standalones cannot control the mechanism correctly other than a 5v on and off signal. to control the actuator as OEM it is requred that your computer be able to vary the input voltage to accurately control cam timing phasing degree by degree.
