Hey guys. Just figured out why my car would run on only 1/4 and barely on 2/3. It has bent valves. I have GSC zero tick lifters. I bled them before I put them in.
Setup is a 2.4 with mivec head, GSC r2 cams, kiggly behives and ferrea valves.
Engine was timed correctly etc. I've timed it many times previously. I am puzzled as to how this could happen? Bad lifters? When I took the lifters out. Some where squishy and some where soft.
Thanks

 

Maybe the valves hit the pistons. I think R2's have the most lift of any cam. Do your pistons have the recessed reliefs for the valves (valve pockets?). Just a thought, good luck solving you problem.

 

Either the above, or it wasn't in fact timed correctly

 

I have Manley 9.5 pistons. Yes they have valve reliefs.

 

Engine was timed correctly. Even had my friend double check it.

 

lifters take time to bleed down after removed from head and reinstalled. they can hold valve open wider than normal for first few hours after install. has had me worries a few times on start up. but never used such a high lift cam. if head and block are both machined you can be in clearance trouble with those

 

Block had been machined once with very little taken off of it. I don't know about the head. I'm starting to tink it bent valves on the old 2.4 block. I was having oil burning issues and tought my guides/seals where bad so I took the head of and had a reputable machine shop re do it. Bled lifters. Put head on. Still burned oil. But it failed leak down on the same 2/3 pistons. Gotta love this ****.

 

turn engine by hand always just to be sure; hard lesson learned for next time

 

Engine was rotated by hand multiple times to check timing etc. It did not hesitate while rotating.

 

Did you recheck the timing of both crank and cams after the failure? Which valves were bent? Intake, exhaust, or both?

 

Also, shouldn't all the valves have bent ideally? Not like any valves in a particular cylinder are timed differently than others. You sure they weren't already screwed? Sounding more like they had an issue on the 2.4

 

Yes. Both cheked while the engine was timed when it was on an engine stand and then cheked while it was having starting issues and then yesterday.

Hooked up my compressor to it with about 120 psi. Keep in mind. All lifters are out. When I pulled the lifters. Some where squishy and some where rock solid. Lifters are GSC zero ticks.

Took the intake manifold off.

#1- leaking out the intake port from valve closest to cam gear.

#2- leaking out the intake port from valve closest to cam gear.

#3- leaking out the intake port from valve closest to cam gear.

#4- leaking out of exhaust side.

 

#1- leaking out the intake port from valve closest to cam gear.

#2- leaking out the intake port from valve closest to cam gear.

#3- leaking out the intake port from valve closest to cam gear.

#4- leaking out of exhaust side.

 

Have you removed the head and inspected the valves? This isn't clear.

 

1-2-3 are pretty standard, weird that 4 bent an exhaust valve and none of the others are touched. i'm guessing this was a recent test just in the past day or two?