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Pic #1 Pic#2 Pic#3 Pic#4 Pic#5
Here is a quick explaination of how the VVL valvetrain works. If you notice in pic#5 (The shaft in the center). This shaft runs through the head from one end to the other. This shaft does not spin and is staked by a small bolt at the cam gear side of the head. There is a Channel that runs the length of the shaft. The end of the shaft is blocked off. There are four feed holes, which are located at each rocker arm location. The rocker arms are located on a pair of valves. The other end of the rocker arm pivots on the shaft. Notice The "whole" or the channel the shaft runs through (Pic#1). As the solenoid(top of pic#5) is activated, there is a passage in the head that opens and allows the oil to pass through the shaft. At this point the oil passes through the feed wholes (Notice pic#2) into the rocker arms. This pushes the pin foward in the rocker arm. (notice pic#3) This locks the center part of the rocker arm which enables the center cam lobe. Notice pic #4. This engine works completely different than a DE. There are no "lifters" pushing the rocker arms up. The shaft is machined at the proper height for the rocker to swivel or rotate on. The lash adjustment is adjusted by the shims on top of the valves. This is a completely mechanical operating system. The only hydraulic part of this set up is the pin which enables the center part of the rocker arm to activate.
I hope this is a good explaination for those of you who do not understand how this works. I will post a pic of the head complete.
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06 monaro cv8
91 ser 311whp@15psi
92 nx 185 whp all motor sold!!
sr20ve in the House with some freeze
CT SUPERHERO
DO YOU KNOW WHO I AM!!! I THOUGHT SO!!!!
Last edited by supercowboy : 03-10-2004 at 02:18 PM.
This is why the VE will rev quite high then?No HLA's to get in the way of high revs...How often will the shims require attention/replacement?
Good pictures, supercowboy, cheers.
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HP11 VE - SOLD
BCNR33 GT-R owns the road
E36 328iM family sedan
HP10 SR20VE track abuser in the pipeline
yea does that mean we will need to get the valves adjusted every 60k like a honda motor? and who knows how to do it, and the proper specs...since there no hydraulic lifter.
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1993 NX2000 - NEO VVL SR20VE - WAI - Custom 2.5 Catback - NGK Plugs & Wires - KYB AGX / Eibach Sportlines - 15" Kosei K1 Wheels Wrapped in 205-50-15 Sumitomo's - Fidanza 8.5lb. Flywheel - ACT HDPP w/ Street Disc - Full ES Bushing Kit & Motor Mounts - B&M Short Throw - Progress Technology Rear Swaybar - Summit Racing VVL Activation - GO NEO!
Interesting....
Well, that certainly clarifies a lot of things.
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Vehicle:1995 Dark Green Infiniti G20 Real name:Howard Wright Current mods:91 intake cam at 19* degrees, TopSpeed header, M3-style rear wing, P11 rims, *Recaro LS-L seats* I.C.E.:Pioneer DEH-P6800MP CD/MP3 HU, Audiobahn AS65Q 6.5" components in front & back....HELLZ YEAH!!!! "THOU SHALT NOT MOD THAT WHICH THY CANNOT MAINTAIN" -thus speaketh Mr. Ryte
yea does that mean we will need to get the valves adjusted every 60k like a honda motor? and who knows how to do it, and the proper specs...since there no hydraulic lifter.
There should not be any adjustment. You can check lash to make sure it is in spec. I havent heard of people adjusting the lash from wear. You would have to adjust lash when the machine shop does a valve job.
Last edited by supercowboy : 03-11-2004 at 11:59 AM.
hi, is there anyone know if a adjustable cam pulley is needed with a SR20VE 20V cam swap?
You can use a adjustable pully on anything. To make it right you really have to degree it to put it in the right spot. Then you can adjust it on the dyno.
Pic #1
Pic#2
Pic#3
Pic#4
Pic#5
and who knows how to do it, and the proper specs...since there no hydraulic lifter.
