If you do not believe JCR, who will you believe. Like Catsailr27 said, Jim knows of which he speaks. 😁I have a 2zzge cylinder head with full ferrea valvetrain, oem rockers and MWR stage 3 cams. What are the recommended valve lash adjustment specs for intake and exhaust?
I contacted JCR and they told me .014” for both intake and exhaust.
The measurements are taken between the shim and the rocker, right? Or is it between the cam and the rocker?I missed the oem rollers after reading Ferrea valvetrain. Glad he was able to clarify it! Recommendations have changed over the years to open up the intake from original specs in part to cam wiping theories.
I am about to measure my valve lash, and am confused about what the settings should be. I have a few Toyota service manual references for the 2ZZ-GE engine, and they have different valve lash values. 2000 Celica Manual (2ZZ-GE sections) 2003 and 2005 Matrix Manuals (2ZZ-GE sections) Intake...www.lotustalk.com
According to the manual.... Routine service clearance checks should be made between the cam and roller follower. Only if a valve or rocker arm is replaced need the clearance between individual valves and the rocker arm be measured.The measurements are taken between the shim and the rocker, right? Or is it between the cam and the rocker?
The head had ferrea rockers on it but those where replaced with oem rockers. That is the only thing that was done. Would the adjustment be off because of switching the rockers? Also the .018 is measured between cam an rocker or is the .018 between rocker and shim?According to the manual.... Routine service clearance checks should be made between the cam and roller follower. Only if a valve or rocker arm is replaced need the clearance between individual valves and the rocker arm be measured.
But I'm missing that TSB that was referred to in one of the previous links but what I copied above makes sense.
That Toyota special tool looks like it would make for much easier adjustments. When I was a Kawasaki mechanic we had similar tool for KZ900 valve shims.
I already emailed him and his specs with oem rockers are .018. I just want to know the correct way to measure this. Cam lobe to rocker or rocker to shim?Looks like according to what that manual stated above there could be differences even with oem ones so with the Ferreas being completely different I would say yes. I would email Jim and get his input since that is how he sets these heads up when he builds one. Here's BOE link to what comes on JCR head.
JCR Tool & Die and BOE have been working together to make the best heads for the 2ZZ-GE for years. Together, we've discovered the various failures and the best solutions to resolving the issues with the OE Toyota parts. JCR has become synonymous with top quality when it comes to the manufacture...www.boefab.com