Had to hone a cylinder that had some rust

[rjrobin2002]

Had one cylinder that got some water in it and I gave it a slight stone hone and then ball hone.

3 spots about 1/2" diameter didn't come out.

Put some fresh cast rings in that one hole.

Do yall think the 3 spots are gonna cause a compression or oil consumption issue?

 

[DirtDonk]

Never had to deal with that, so can't say with certainty one way or the other.
Which makes me think that, I bet it's going to be as much "luck of the draw" and serendipity at their finest.
In other words, it can go one way or the other.

Paul

 

[Bruners4]

My prediction is that it will run very well and any oil usage will not be noticed. Compression loss will be minimum also except under very high load conditions at low speeds. I've seen a lot worse cylinder bores in running engines that had very good power and little oil usage.

 

[Teal68]

I think it will be fine. I had a very similar situation recently with a 351C. The machinest said he'd run it that way since I already brand new stock bore pistons and rings. He suggested no need to over bore for those minor imperfections. All good. If it matters, just a stock build.

 

[rjrobin2002]

I'd guess the pits are .005" deep, I can feel them with my fingernail.

I would definitely get the motor bored out if they were throughout the entire cylinder or all 8 cylinders had similar spots.

But it's just 3 spots about 1/2" diameter.

 

[DirtDonk]

That’s deeper than I thought based on the earlier pictures. That’s a nasty divot.
And right at the ring areas too. What’s the depth/location of the ring grooves in regard to those?
Do they still sleeve 302’s?

 

[rjrobin2002]

That’s deeper than I thought based on the earlier pictures. That’s a nasty divot.
And right at the ring areas too. What’s the depth/location of the ring grooves in regard to those?
Do they still sleeve 302’s?

That zoomed in picture makes it look 10 times worse than it is.

It made my 400 grit ball hone texture rough

 

[rjrobin2002]

Best photo I could find

 

[73azbronco]

So it is a result of water, must have been for a while. Is the engine in or out of the truck? What is long term plan, I'd say short term run it, but long term the rings will not like it.

I watched my college buddy overhaul a caddy engine on his dorm floor. He used a punch to tap a million dings into the pistons to make them "larger". A poor mans knurling job, he learned it from his dad. That car is still driving 40 years later.

 

[rjrobin2002]

So it is a result of water, must have been for a while. Is the engine in or out of the truck? What is long term plan, I'd say short term run it, but long term the rings will not like it.

I watched my college buddy overhaul a caddy engine on his dorm floor. He used a punch to tap a million dings into the pistons to make them "larger". A poor mans knurling job, he learned it from his dad. That car is still driving 40 years later.

Engine is on my engine stand.

I bought the 96 351 roller short block for $150 and was just gonna reseal and rock it for a few years and was trying not to visit a machine shop for just 1 cylinder.

I may pop the piston back out and hone longer and keep measuring till about .005" it removed. The bore still measures exactly 4.000" after the light hone.

 

[73azbronco]

have it bored, just that cylinder, or maybe more aggressive hone which the machinist can recommend better

 

[nvrstuk]

Engine is on my engine stand.

I bought the 96 351 roller short block for $150 and was just gonna reseal and rock it for a few years and was trying not to visit a machine shop for just 1 cylinder.

I may pop the piston back out and hone longer and keep measuring till about .005" it removed. The bore still measures exactly 4.000" after the light hone

What is the piston to wall clearance now? Get much over .005" and you will have piston slap issues.
Why not sleeve it if you're worried too much?

From the pics I'd run it. All these "barn finds" that have pitting and rust from sitting for 5-20 yrs are running every day...

 

[rjrobin2002]

What is the piston to wall clearance now? Get much over .005" and you will have piston slap issues.
Why not sleeve it if you're worried too much?

From the pics I'd run it. All these "barn finds" that have pitting and rust from sitting for 5-20 yrs are running every day...

I had just read that you can hone out to 4.005" without slap and the rings take up the extra. Figured half of what's left would go away with . 005" removed.

But you're the pro and I'm just gonna run it. Worst case scenario I figure I'll have to get it bored and throw a 408 stroker kit in it if it gives me problems.

 

[73azbronco]

run it, my reco to bore/hone is because its out

 

[Teal68]

I'll add that I couldn't feel the spots after the machine shop honed. Still, I think you'll be fine to run that.

 

[nvrstuk]

I like the 408 idea down the road...

 

[rjrobin2002]

I popped the piston out and honed with a 220 grit 3 blade stone and 400 grit ball hone about 60 seconds with each.
It measured I removed about .001" more. Cylinder measures 4.001" now.

Looks much better too me and I am not gonna think about it again.

 

[ba123]

I would think you're fine either way...but prob better to hone more like you did.

If you hadn't, the rings would've cleared any rust spots as they set.

Still better to hone though, so good call.