The Grond Chronicles : The Bent Valve Cometh [Dialup, you know the script]
 

So I bent a valve last Saturday and began the tear down of my engine . Today, the Frozen Tundra was not as bad (low 50 deg), so I pulled the head to see if I punched a hole in my piston and to try find the smoking gun (what caused the dropped valve)

Well what I found was very interesting, but I will let the pictures speak for themselves.

EG :cheers:

Removing the driver's side head
http://grondpix.com/bent-valve/bent-valve - 1.jpg

Head removed - exhaust valve impacts on every piston :ack:
http://grondpix.com/bent-valve/bent-valve - 2.jpg

This does not bode well.....
http://grondpix.com/bent-valve/bent-valve - 3.jpg

I see the light...
http://grondpix.com/bent-valve/bent-valve - 5.jpg

:willy:
http://grondpix.com/bent-valve/bent-valve - 6.jpg

Valve on the left is the Leaning Tower of Pisa...
http://grondpix.com/bent-valve/bent-valve - 7.jpg

Removed the lifter cages and lifters
http://grondpix.com/bent-valve/bent-valve - 8.jpg

The Smoking Gun.....
http://grondpix.com/bent-valve/bent-valve - 9.jpg

Might as well pull the passenger side head...
http://grondpix.com/bent-valve/bent-valve - 10.jpg

Here a video of the bent valve :willy:

So the Harland Sharp Roller Rockers are 1.8:1 ratio and NOT 1.7:1 ratio as I was told when I bought them.

So they are up for sale. That ratio is way too much for the monster cam I currently have (234/240 598/608 114LSA) but they would net nice gains with a smaller cam or stock cam.

:willy:

Stepehn; help an old fool here and help me understand what the "smoking gun is"

One bent valve means one thing... but when they all are banging the pistons (and not banging in the Knooger way :) )

I can't make it out.

O.K.

Tim, Post # 4 explains what happens :thumbs:

I love the video, impressive :crazy:

Wrong sized rockers :willy:

Stephen sorry to see this sort of thing! Thanks of posting the pics, makes
for an enlightening experience. Good luck with repairs EG.

I know its not related but I'm glad LGM flycut my piston heads when they
installed the h/c!

:cheers:

Those valves have seen better days. :eek:

I told you that you had piston to valve clearance issues. I don't like being right in this case though.

Wow!! That's a real shame. It blew me away seeing all the the intake valves hitting pistons. The first thing I thought of was valve timing. Which your explanation addresses. That's where you know a heck of a lot more about cams and rocker ratios and what it takes to make things work in unison. This is where I have to give it to you for doing these kind of mods and going for it. I am sure you'll get it all together before spring. Keep us posted as I know you will. Will you be keeping the same cam and change the rockers and I guess the heads? I guess my question is what's the next step from this point?

Oh bummer EG... That "left a mark" for sure... :willy:

My first thought was bad valve timing too... as in the new sprocket had slipped, something else similar broke... something along that line...

So did you check to see what sort of problem you may also now have with your valve guides?? How long did you run the "Grondmeister" with this problem? How old are these heads? It looks like enough carbon there to be originals...?? so I guess that's better than possibly messing up brand new heads too... :willy:

Dang that stinks.... :ack:

Maybe ask Bill if he'd be willing to buy a headless engine...

Dang, Dang, Dang... :smash:

:willy: Oops :eek:

:leaving:

Ouch.... looks like it "flycut the pistons" with the exhaust valves. Interesting, because normally you have P/V clearance issues with the intake valves...

steve

.608 lift on the exhaust lobes is enough to do it with those rockers. Ouch. Leave it to EG to invent a new way to flycut.

I answered everyone's questions in Post Number 4 - I bought the Harland Sharp's used and was assured that they were 1.7:1 ratio - which is the stock ratio. This would have been fine with monster cam.

But they measure at 1.8:1 ratio - which is fine if I had a stock or baby cam - but I don't :ack:

So in case everyone missed it - the Harland Sharp 1.8:1 ratio was the "smoking gun".

The HS were not harmed in any way (they seemed to be forged in a ICBM bunker or something :willy: ) and they are now up for sale.

EG :cheers:
<edit> the HS have been sold

Yes, back to stock rockers and changing the heads, yes :yesnod:

The engine will be back together next weekend. :thumbs:

You have some major skills Stephan :thumbs: