Engine Piston Wear

McDirty

Member

Jan 21, 2014

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Camano Island Washington

Feb 19, 2014

#1

• Feb 19, 2014

• #1

I may have posted this twice.
i finally got around to tearing apart my engine and it appears that i had a forged 347 stroker. I looked at the pistons and noticed some "wear" marks and am wondering if this is normal, or is it bad and if so can it be fixed

 

jrichker

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Feb 22, 2014

#2

• Feb 22, 2014

• #2

How many pistons have this problem? All of them or just 1 or 2?
The marks look like they are from dirt or abrasive material in the oil.
What do the cylinder walls look like? Can you see any scratches, or is the swirl pattern from honing the cylinders still visible? With stock engine 5.0's, the hone marks are often still visible on high mileage engines.

 

McDirty

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Jan 21, 2014

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Camano Island Washington

Feb 22, 2014

#3

• Feb 22, 2014

• #3

All pistons look like this and cylinder walls.

 

madspeed

Colonel Mustard

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Feb 22, 2014

#4

• Feb 22, 2014

• #4

somebody run sand through that thing?

 

madspeed

Colonel Mustard

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Feb 22, 2014

#5

• Feb 22, 2014

• #5

haha, just noticed your username. Looks like this engine has run Mc Dirty

 

Last edited: Feb 24, 2014

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jrichker

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Feb 24, 2014

#6

• Feb 24, 2014

• #6

McDirty said:

All pistons look like this and cylinder walls.

Click to expand...

I hope you have enough meat left in the block to take a .040 over stock rebore. That might clean things up enough to save the block, but only the machinist will be able to tell.The pistons are scrap, and so are the rings.

 

McDirty

Member

Jan 21, 2014

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Camano Island Washington

Feb 24, 2014

#7

• Feb 24, 2014

• #7

The picture makes it looks worse that it really is. I took it to a shop and I was told they are fine. More than likely what happen, something got in the oil and made some wear marks. I talked to JE pistons and got the measurements of what the pistons should be and the tolerance allowed for the pistons and piston to wall distance. Everything is still within tolerance

 

Gearbanger 101

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Feb 25, 2014

#8

• Feb 25, 2014

• #8

Higher wear on the pistons and cylinder is normal with a 347....despite what some claim. The 347's lower rod ratio puts greater side load on the piston skirts an cylinder walls because of it's more exaggerated rod angle. This creates an increase friction (in comparison to standard bore/stroke 302) that causes premature wear to these area's. Nature of the beast. It's a trade off us stroker guys have to live with for those bigger power levels.

 

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