Hi smart all-motor folks!

This is Corey Jacob's old car, I'm reposting from the Prelude forum on Corey's advice.

The big (mid) lobe on the exhaust lobe (#1) has a notch worn in it, and the rocker is worn bad! This is with supertech valve springs and retainers, revving to ~8300 RPM.

The others (#2, #3, #4 and all the intake ones) look OK, with some minor discoloration here and there but nothing I can feel with my fingernail.

So, like, WTF? Should I blame the cam/valvesprings combination, or blame it on oiling, or blame valve lash being too tight?

Also, Corey reports that it happened before to him with stock cams.

Sorry, pic's aren't perfect, but I think they show it well enough.



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda318dx &raquo;</TD></TR><TR><TD CLASS="quote">This is a roadrace car, its in VTEC for the entire 30 minute races...

I don't think its an oiling issue because the same thing would have happened to the #4 and #1 cylinders at least, as they are furthest from the oil.

I really think the valve lash may have been just a little to tight there and it was trying to compress more than it would allow.

This same exact thing happened when I only installed the supertech springs and retainers with STOCK cams. Car ran fine and didn't notice anything wrong until I pulled the engine and all 4 middles lobes were pitted. I have a feeling to tight of valve lash may have caused that, because I wanted all the lift I could get out of the cams, with the valves still closing. I could be completely wrong though.

This did not cause the engine to blow/overheat, I know that much. When it did it before 3 years ago, the motor was still runnning very well, I only took it apart to add the JUN cams and noticed it.</TD></TR></TABLE>

 

what kind and condition are the LMAs in? looks like one could have froze up.


Modified by brick top at 10:15 PM 9/26/2006

 

Bump for H22 expert help..

 

That is ugly. Have not seen that on a B-series-but I have heard that H-series motors have that issue at times. Larry Widmer mentioned it on his boards a year or two back.

 

It's only on that Cylinder?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suprdave &raquo;</TD></TR><TR><TD CLASS="quote">It's only on that Cylinder?</TD></TR></TABLE>

Yup, just the one! The others aren't super-pretty, but don't have any dents that I can feel with a fingernail, so I'd say they're OK.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brick top &raquo;</TD></TR><TR><TD CLASS="quote">what kind and condition are the LMAs in? looks like one could have froze up.


Modified by brick top at 10:15 PM 9/26/2006</TD></TR></TABLE>

id go this route

 

Stuck LMA or something of that nature...I'd go thru the entire head and you are gonna need new cams.

 

Is it me or does it look like there's water in your oil.

 

looks like poor oil quality or lack or routine oil changes judging by the brown "sludge" like build up on the head casting.

plus its also really obvious you have coolant mixing in the oil from the white creamy goop you have all over the place.

so.....shity oil or no oil changes + coolant in oil + reving the **** out of the engine = a **** load of wear.

chances are its not only one lifter thats fucked. if you look at all of them I'm 100% positive that they are all worn out of spec along with both cams are worn out of spec also.

good luck

 

Sorry, I should give a little background. This is a race car, gets "pretty frequent" oil changes with synthetic oil (Mobil1 5w30). It gets zero street miles, just track miles.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Furyof4 &raquo;</TD></TR><TR><TD CLASS="quote">Is it me or does it look like there's water in your oil.</TD></TR></TABLE>

Yes, there's water in my oil. I'm tearing into the head because I had a head gasket failure, it seems, after overheating. Finally the radiator hose popped off, that was the last straw.

(I guess that water temp gauge wasn't lying after all... this happened at NASA national championships, it finally cut out 4 laps from the finish. I wasn't about to stop pushing, but it didn't quite make it)

 

BUMP yea sorry about the cams i am right there with you two i am rebuiling my motor right now and i just found the same prob i have to flat spots on my exhaust cam on cycl 1 and 3
another B series with this prob

 

If you already check for the LMA's, I would inspect the cam rails holes and see if there's no crap on it.