Ok for some backgroud info i'm running a set of custom ground cams, they are for a turbo LS application. The cams have close to 12mm of lift, but a short amount of duration(about 15 degres greater than stock). i've been having trouble with my timing belt jumping. The 2 previous times(one which lunched 4 valves) it was chalked up to an onld timing belt....So a new one was bought and installed after we had to rebuild the head....

Please refer to this thread for more info
https://honda-tech.com/zerothread?id=222534


Holy friggin cow I'm about to set this POS on fire an roll it into the nearest congragation of innocent bystandards......This has me so pissed off right now. After a 3 day tear down a rebuild of the entire top-end of the car. It was fully assembled and ready to rock tonight. My friend gets done with it and takes it out for a test drive. He almost gets back to the house with it after a 2 mile easy slow drive, as soon as he clutched in to turn into my developemtn to car dies. Without a sound.

YET AGAIN my cams jumped time this time a full 180 from each other. And guess what I still have good/equal compression on all cylinders! Am I a lucky MF'r or what? Now I just have to use the 2nd chance to the best of my ability before I have to rebuild another head...or worse.

Please could some one tell me why my cams keep slipping? The cams have close to 12mm of lift and a low duration profile. I'm running Crower valve springs and Ti retainers. If let the tensioner pull all the slack out of the belt there still seems to be some left, so I have to coerse the pulley to take up a bit more by pulling on it. I think the cams jumped this last time because the tensioner pully bolt wasn't quite tight enough, but I thought I put enough force on it, I didn't want to snap it off. So this time I got out the torque wrench, set it to 40 lbs and hit the bolt with that.....

I know some of the DOHC VTEC guys have trouble with some of the high lift aftermarket cams, any wisdom there? Any other suggestions? I'm out of ideas right now. I don't feel like folowling the proper tightening sequence and torquing the tensior bolt to 40 lbs is enough. Am I wrong? I don't know if it has been a string of bad luck or what, but i'm 1/2 scared to take the car out for a test again. It never did this before I installed my new cams/valvetrain. but it costed my too much money to give up on.....

Tommorow i'm going to take off my adj cam gears and put the factory ones back on. Maybe that'll help some. I'm gong to the beach in 2 days and intend to be driving this car. I need some help fella's

Thanx for anything

~steven

 

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