Broken Rings

groove · Jan 20, 2014

My cracked piston turned out to be both rings on #2, top ring on #5 and top ring on #8...I suppose that's why it smoked so much. New pistons on the list among a few other things, may as well its all apart now!

Dzchey21 · Jan 20, 2014

did it mess up the top of the cylinder? Pretty common for them to chunk it out and force you to bore the block or sleeve it

groove · Jan 20, 2014

nope, everything looked okay, even the heads appeared to be damage free.

Gary · Jan 21, 2014

You are lucky.

groove · Jan 21, 2014

Yes, looking like it. Hoping the block checks out good enough to use std bore pistons, Id like to put the HD ones in but there are only available in standard bore.. what is everyone using for oversize pistons?

04stroker · Jan 21, 2014

groove said:
Yes, looking like it. Hoping the block checks out good enough to use std bore pistons, Id like to put the HD ones in but there are only available in standard bore.. what is everyone using for oversize pistons?

I would contact Morgan@midwest if you need oversize and get a set of his forged pistons.

6.4 Stroker · Jan 21, 2014

groove said:
Yes, looking like it. Hoping the block checks out good enough to use std bore pistons, Id like to put the HD ones in but there are only available in standard bore.. what is everyone using for oversize pistons?

I just bought OEM Ford .020 over and had them delipped.
Ceramic coating wouldn't hurt either.

groove · Jan 21, 2014

the forged slugs are out of my budget, may have to go the factory route and have them machined like 6.4 stroker.
Have we heard how machined factory pistons are holding up?
Not that I have huge plans for horsepower (running mini maxx race), but I don't care to remove the engine again..

11STROKER · Jan 21, 2014

how many miles on this truck ?

groove · Jan 21, 2014

260,000km so about 160,000 miles

webb06 · Jan 21, 2014

You definitely don't need forged pistons on a DD truck. Get ahold of Morgan @ midwest and get the HD delipped and coated pistons he offers. Std bore is available

White_monster · Jan 21, 2014

Forged pistons are not gonna like daily driving.

groove · Jan 22, 2014

yup, hoping I can get away with standard bore and run the HD pistons...should know more soon

Boosted6.4 · Jan 22, 2014

White_monster said:
Forged pistons are not gonna like daily driving.

How come?

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backwoodsboy · Jan 22, 2014

Boosted6.4 said:
How come?

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Forged don't have a steel ring-land.
There are issues with the keystone rings wallowing out the upper ring-land.

Boosted6.4 · Jan 22, 2014

backwoodsboy said:
Forged don't have a steel ring-land.

There are issues with the keystone rings wallowing out the upper ring-land.

Is that just because of use or since it's a daily driver it would go through many heat-cycles a day?

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White_monster · Jan 23, 2014

Forged pistons require a larger piston to wall clearance, Morgan's pistons require 0.007"-0.008" wall clearance and factory is 0.003"-0.004". The increase in wall clearance is due to the material used in the pistons and the amount of expansion once up to temp. Yes ring lands wear but that's not the only thing to consider. The increase in wall clearance will give off piston slap when started. The noise will go away once up to temp but that's still extra wear on the cylinder and piston skirt from rocking in the bore. A lot of drag race engines incorporate a coolant heater to preheat the coolant to 160* and this helps to expand the piston some without extra wear.

Hope this helps.

Boosted6.4 · Jan 23, 2014

White_monster said:
Forged pistons require a larger piston to wall clearance, Morgan's pistons require 0.007"-0.008" wall clearance and factory is 0.003"-0.004". The increase in wall clearance is due to the material used in the pistons and the amount of expansion once up to temp. Yes ring lands wear but that's not the only thing to consider. The increase in wall clearance will give off piston slap when started. The noise will go away once up to temp but that's still extra wear on the cylinder and piston skirt from rocking in the bore. A lot of drag race engines incorporate a coolant heater to preheat the coolant to 160* and this helps to expand the piston some without extra wear.

Hope this helps.

That makes sense! Thanks for the explanation, I was just curious!

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