Okay we finally picked up my car and I was looking at the cams, and found something really weird....

Okay picture a Crower Stage 3 cam...damn those are some big *** lobes! Okay now focus on the VTEC lobe on the Exhaust cam on the 3rd cylinder.

Now on the the 'peak' of the lobe it appears like someone has almost filed off the sides a little. Equally on both sides of the lobe it slants down....like it has worn...

What the hell could that be? I'm looking at the rocker and there's nothing that could be interfering....I also checked the intake side on the 3rd cylinder and noticed a little...but barely any slant. Any ideas? Maybe Crower can rebuild my engine

 

my friend had a probe w/cam (just intake.) some JDM stuff anyway.

Think he had this same problem.

But, you could actually hear the cams hitting his valve cover, his car seized shortly after due to oil pump failure..

anyway don't know if this helps, but the sound was similar to when you need a valve lash adjustment, this is the only thing I can think of besides with what you described.

Hope I helped.


[Modified by dsludefosho, 12:27 AM 10/28/2002]


[Modified by dsludefosho, 12:28 AM 10/28/2002]

 

hmm maybe they came like that?

 

true...its a possibilty crower designed it like that, maybe for longer duration. BUT you said it was only on one lobe right?? I would think they would all match..

You should give crower a call.


[Modified by dsludefosho, 9:30 AM 10/28/2002]

 

maybe they had to round them off a little more before sending them out, i know skunk had some cams that where squared off and where bending valves

 

Are these cams installed in the engine yet? I personally have seen issues with high lift cams bottoming out on the stock h22a lost motion assemblies. To remedy this, (We use) and some manufacturers recomend using ITR lost motion assemblies as a replacement. They have further spring travel and will allow for the additional lift without binding causing heavy wear on the cam lobes and rockers.


[Modified by 2point6, 5:24 PM 10/28/2002]

 

really that's interesting. but why would it be bottoming out on only one cylinder? also it's no worn across the face of the lobe....just on the left and right edges.

But I see there is a line right across where it is wearing....like from where it was forged....hmm sounds defective....

 

So your saying you can put ITR lost motion assemblies in the H22 and they are better stock then what we have now? Does it it matter what H22 we have 1 or 4?

 

maybe that specific lobe wasn't toleranced correctly so its off in the "x" direction..could happen.

That may be why its only wearing on the edge..but, in any case it shouldn't wear this early in use. '
How long did you have the cams in?

VOID, my statement if its on the left and right, have no clue. Unless it's hitting something above or below that has the same curve


[Modified by dsludefosho, 12:12 PM 10/28/2002]

 

Which lobe/cylinder is wearing? VTEC only? It could also be debris plugging an oil port on the oil rail (above the cams) just a suggestion... If you can with the cams removed, Press down on all the VTEC rockers and see if there is any variance as to how smooth the spring pressure on the lost motion assembly feels.

 

This will depend on if you are using high lift cams or not. The stocks are good, but the ITR's do have a much smoother operation. These also work really good with regound cams. Since the base circle is decreased on a regound cam, the distance between the camshaft and the stock lost motion assembly is greater. This can cause a very noisy valvetrain because it allows the VTEC rocker to have reduced spring pressure to keep it from bouncing off of the VTEC lobe when not in use. The ITR's are a little taller (but they compress more) and will take up the diference in space. Most aftermarket billet cams are reground and there are variances in their respective base circles.

Here is the part # for the ITR lost motion assembly.
14820-P73-010

 

wow, i just never hear any positives with people using crower cams. something to think about.

 

Can you take a pic of the cam and post ?

 

^

 

Yeah I'll try to take a pic after work...but my car is at the dealership...hopefully I can get the key...I should go jack my jdm headlights before somebody else does...since my front bumper is off...

 

Is this on the face of the lobe just under the peak ? (by face I mean the part that contacts the rocker).

If it is, I wouldn't worry about it. The ramps are real steep on those cams. The ones I had seemed to have a very light line on the face of the lobe before coming to the peak. It was cut that way.

A pic would help.

 

I'll see if I can do a diagram:

regular VTEC lobe from standing in front of the engine bay: ignore the periods

|........|
|........|
|........|
|........|
|........|
|........|

My lobe:

|..........|
|..........|
|\......./|
|/.......\|
|..........|
|..........|

It's at the peak of the lobe like someone took a grinder on both sides and made these slants off to the left and right sides.

 

The angle where the face of the lobe and the side of the lobe meet was ever so slightly jagged on mine. The blank was cast like that. When the blank was cut, it left these little ripples instead of a straight line.


[Modified by Mover, 4:17 PM 10/29/2002]

 

yeah but all the others are straight cut 90 degrees...

Maybe it was jagged and they just smoothed the sides off? I mean there is still 80% of the lobe hitting the lost motion assembly, so It shouldn't impact performance...

 

My cams didn't look half as clean cut as the ones they show in their
advertisements.

 

Mine looked pretty good all around..maybe they finished them..hence the shavings...I don't see it impacting performance...I'll e-mail them anyway

 

I guess he is slowly getting his act together with these cams. I picked them up when he first offered them (major problems). I'd consider picking them up again if the quality has gotten better.

 

Okay I checked with the engine builder, and the lobe is fine. He told me about how they weld the cams or something in their process and there are imperfections that they have to clean up. Won't affect my performance.