New cams hitting on pistons

[JeanDSM]

My friend has a 97 GST with a 7bolt engine, this week he installed brand new wiseco 8:5.1 and eagle rods, arp studs with cometic head gasket, he also installed a 1G head fresh rebuilted with crower springs and retainers. he also bought a pair of comp cams 200's Today when he was instaling the timing belt he realized that the valves where hitting the pistons, he removed the cams and put the stock ones back in, the valves stop hitting.

Isnt this cam supposed to be like plug and play, why is it hitting? are we missing something?

 

[staticbrainwash]

Uh, timing is off? It's an interference motor. So if timing is off the valves will slap. I hope you didn't run the motor like that. If so, have fun with new valves.

 

[Jeff822]

Did he set it at TDC before doing the T-belt and cams?

 

[DJYoshaBYD]

yeah.. its sounds like the timing was off a couple o' teeth... reset to TDC and start again... take the timing belt covers off so you can see the real timing marks, not the ones on the plastic cover... This will show thee the way.. Go grasshopper... Fight that timing belt

http://www.vfaq.com/mods/timingbelt-2G.html

 

[dsm-onster]

Timing is off.

 

[selmerguy]

Re check the timing with the comp cams. Sounds like it is a few teeth off. I know with my web cams (546/547) if I am off a tooth I will hit. With more aggressive cams the valve stay open longer and timing is very important.

 

[JeanDSM]

You need to laugh about this

My friend who has a 97 gst with 50trim and all supporting mods even forged internals about a month ago he told me that he wanted some high performance cams for his car, so I got him a pair of comp cams 101200's this week when he was installing it he called me to ask in this forum why his valves were hitting on the pistons, too much lift?, there I made the thread, later I called him, to ask him if the timing belt was ok or if it was one tooth off or something, he told me No, I had the engine at tdc and without the timing belt on I turn the camshafts and I feel the valves hitting on the pistons ( I didn't thought that my friend was so dumb), so I told him, you need to install everything "its an interference engine" 2 minutes later he called me " these people send me the wrong one's, one camshaft says 101201I and the other one says 101201 E, I just cant believe he asked me that, anyway thanks all of you who reply me.

 

[oldman]

Tell him he needs to send them back immediately.