Took the HEAD OFF today..PICTURES*****

[jwilliams3]

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IMG]http://i73. photobucket.com/albums/i214/sporter27/000_1780.jpg[/IMG]



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[jwilliams3]

So far it looks like most of the intake valves have "made contact" with the tops of the pistons at some point...



Most of the pistons have a little build up of carbon on them as well as the head surface.

The #6 six in the pictures has alot of carbon build up which I cleaned off.



There is some pitting on the tops of some of the pistons from overfueling.



All of the cylinders have some lines but they cannot be felt by finger nail or tip.



Engine has 32k miles.



I am going to take the head apart and inspect the valves to make sure they are straight. I will also be installed a new set HD valve springs to prevent contact again :-laf



The headgasket is in *decent* to good shape but thats about it. It is in the early stages of coming apart around the cylinder edges.



I also bottom tapped all of the block holes.

 

[jwilliams3]

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[JStieger]

Justin-



I must have missed some of your previous posts! What made you take the head off in the first place?

 

[jwilliams3]

Well, I decided that I wanted to upgrade Camshafts and Valve springs.

I also decided and was convinced I should bottom tap my engine block for the headstuds.



I was a little surprised by seeing the valve contacts, but not that much.

I sort of expected that from sledpulling and all.



I would expect that my engines condition is not all that different from any other truck in the 500hp club.

 

[Lorenz]

Can you circle the contact marks. I can't make them out.

 

[jwilliams3]

In my second post check out the first picture you can see a half moon shape on the outer right side of the piston.

 

[JStieger]

Can you circle the contact marks. I can't make them out.

... and the pitting from overfueling too please!!

 

[jwilliams3]

Your gonna have to look close I dont know how to circle things.

The pitting is only on the outer edges and is very small.

 

[JStieger]

No problem - I saw your post on DTR too and the pictures on there were a lot clearer in resolution for some reason. Thanks for posting them - very interesting, especially the injector spray patterns!



Do you have an idea why #6 would carbon up more than the other cylinders?

 

[jwilliams3]

No I don't know why #6 is worse. Could be a bad injector maybe?

 

[zstroken]

# 6 is almost always the hot cylinder. Water jacket wise, farthest from the intake.

 

[RMalone]

I guess I don't know what to look for but that sucker looks pretty good to me, especially for a 500hp oil sucker.

 

[jwilliams3]

Yeah, its not in that bad of shape!

 

[Lorenz]

Valve contact circled.

 

[Jim Fulmer]

# 6 is almost always the hot cylinder. Water jacket wise, farthest from the intake.



It has nothing to do with the intake, it because the water is so hot once it makes it to the back it doesn't do much cooling. I got to see this in the gasser world 4 or 5 years ago. The tapped the back of the head and pumped water to the back and front both and eliminated the issue.



I thought about doing this when I did my back freeze plug but my truck doesn't stand that much heat for that long.



Jim

 

[zstroken]

Can you prove it has nothing to do with the position of the intake?? This is going to pick up the most heat since it travels thru the intake? Will have the most pressure drop, etc, etc. These all may be minimal, but that with the fact that is these add up the water jacket has a huge impact on the cylinder seizure issue. I do believe that the water jacket is the largest issue, but these other factors aren't going to help. When we are talkin a difference of 50 degrees between molten aluminum and not, every little thing matters.

 

[Diesel Power]

Can you prove it has nothing to do with the position of the intake?? This is going to pick up the most heat since it travels thru the intake? Will have the most pressure drop, etc, etc. These all may be minimal, but that with the fact that is these add up the water jacket has a huge impact on the cylinder seizure issue. I do believe that the water jacket is the largest issue, but these other factors aren't going to help. When we are talkin a difference of 50 degrees between molten aluminum and not, every little thing matters.

that is absolutely correct(zstroking), also any time your valves are hitting the pistons it IS a problem, i would replace the valves as well ---as they have been stressed

 

[Floor It]

The main reason #6 carbons up so much is due to lack of air volume. Just because you have 40,50,60lbs of boost at the intake valve doesent mean anything! The way the port is designed restricts cfm from being able to get into the cylinder, same reason #6 cyl always tends to be the one that melts down first.



John

 

[jwilliams3]

Diesel Power,

Your valves probably need replaced too, according to your mods! :-laf