Reply With Quotemetric glenn!
vvti cam movement
checking a std 3sge beams motor to see how far each cam moves
did the inlet 1st and im using a dial indicator sitting on the bucket preloaded
as it comes up to no 1 at TDC check to see how much the cam is at tdc then advance with spanner to see how far movement is
on the inlet it sits at 5 thou lifter rise at tdc ,then with spanner pulling cam towards the exhaust the cam now moves 250 thou
also i had to hold the crank from moving
ok exhaust this is done the same way except this time check it at tdc by going past till the cam comes off the bucket or the dial indicator stops moving
exhaust is 55 in the off position and it advance toward the inlet 150 thou
so there you have a std motor with std cams
on my race motor
the inlet is 70 on start up and advances all the way to 210 thou
exhaust is turned on 87 and off its 170
both motors are different but the race motor makes its torque later but it also finishes about 1500 rpm,after the std motor
where the std motor finishes hp at 7800 my race motor is still going on to 9000 rpm
metric glenn!
30 thou(sands of an inch) is 1mm, so work it out clay.
250 thou = 8.3mm
150 thou = 5mm
210 thou = 7mm
170 thou = 6.3mm
interesting on how yours opens less on intake side and more on exhaust side, yet makes more power?
possibly due to cam duration or lift before VVTi kicks in ya reckon?
But that's measuring to the mechanical limit of the system, doesnt it then come down to how much of that the tune actually uses in each case? There's no real "kick in". What sort of inlet advance do you see in your tune Glenn? Highest I saw tuning for peak torque was about 43 degrees.
Xero, it's actually .03937" (almost .040") per mm.
I translated this into an easier to read format (to me anyways).
Andrew
Last edited by assassin10000; 15th June 2011 at 03:39 PM.
Hi Glenn,
What oil pressure does the std blacktop beams run to drive the VVT system?
std oil pump can see oil pressure up to 800 kilopascals when cold and on full noise sits around 650 .also uses a nother oil gallery to drive the system that feeds the front vvti controllers
always get that decimal point wrong...
anthony std beams,inlet we saw 46 but we stopped it at 44 so it wouldnt burn out the solinoid
and you cant just stop these from going over either as you will get cam creep
so i have to modify the cam controllers so they dont move as much .about 1.5 teeth against 3teeth as std
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