Finally some progress on 280z but still need a little help

[J Taylor]

SOme of you may know I have been trying to run down a problem with my 280z turbo for going on 6 months now. Have checked everything I know to check and came up with nothing until tonight. The shop that assembled my head with the crane cam, springs and all said I should check the springs to make sure one hadn't broke or anything. They all looked good but while checking it I noticed that while at TDC I have like 4 valves that are open when there are only supposed to be 2. WHen the crank pully is on 0 on the compression stroke the marks on the cam also align perfect but the cam is in the wrong position and the valves are not opening at the right time. I am pretty sure this is where my problem lies that I have been trying to track down for so long. My question is, why is it like this if everything else lines up? Also, how could it get like this? Just to refresh, 6 months ago I was driving the car(had been perfect for the first 100 miles the new head and all was on the car) and it dies out of the blue. Wouldn't crank for **** for a few mins but then cranked right up later but has ran like **** ever since. Only pulls 10 vacuum, idles less than percect, won't rev past 4500, and makes no boost. I always thought it felt like a timing issue but everything lines up. I would like some input before I start pulling this apart just to find it goes back together the exact same.

JT

[Lockjaw]

Bent valves?

 

Sounds to me like maybe you have had some piston the valve contact.

 

What crane cam did you get? Do you know the spec's?

 

I would also just do an eyeball check to see if the crane cam and the stock one are roughly the same, in other words, that there is not a lobe out of place. I am sure that is a long long shot.