Machined block, ok or not?

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John@RED
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Re: Machined block, ok or not?

Post by John@RED »

Thanks All again, you have been very helpful as we are now more confident.
My customer knows this thread and he is ready to pay for another block if mandatory, as this engine will see some race abuse.
Adding other info about it, the upper signs are over the first ring so no problems at all, but the lower three, the ones you can feel it with nail, are between first and second ring.
So they will never stop rusting?

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Dave Koehler
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Re: Machined block, ok or not?

Post by Dave Koehler »

AT this point, armed with what you have heard from the veteran crowd, you both see what your comfort level is.
Flip a coin, rock paper scissors, high card, etc.

Rust never sleeps. If you leave it dry it will keep on growing. Oily and running, not so much.
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Re: Machined block, ok or not?

Post by KnightEngines »

Run it, you'll never even know it's there.
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Re: Machined block, ok or not?

Post by BILL-C »

Just to keep things in perspective, the end gap on your rings will flow about 50 times more blowby than those minor rust pits. The engine will never know those tiny rust stains are there. Keeping cylinder walls thick should be a priority over chasing those insignificant stains. When we come across that same situation we put navel jelly on pitted areas after boring and let sit for an hour, then finish hone.This works the best to stop the rust from growing back. My guys and i have built literally hundreds of engines with those same "ghost stains" with ZERO issues. Many were race applications that we see back for scheduled freshen ups. They don't get worse when running.
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Re: Machined block, ok or not?

Post by blykins »

Those would not bother me either. I'd run it.
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Re: Machined block, ok or not?

Post by hondo383 »

Run it no problem
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Re: Machined block, ok or not?

Post by John@RED »

THANKS!

As I got a GO from customer. :wink:
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Re: Machined block, ok or not?

Post by woody b »

I used to be a people person, but people ruined it.
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Re: Machined block, ok or not?

Post by cjperformance »

Run it and move on!
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Re: Machined block, ok or not?

Post by steve316 »

have we beat this dead horse long enough?
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Re: Machined block, ok or not?

Post by Dan Timberlake »

I do like the idea of getting iron oxide chunks and flakes out of the pits somehow, before going into service.
My reasoning (?) it will be one, (or ten) fewer things for the rings to have to deal with.
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Re: Machined block, ok or not?

Post by peejay »

MotionMachine wrote: Wed Nov 14, 2018 8:10 am Totally insignificant IMO. I've seen much worse put together and run with no issues.
Likewise.

The oil rings don't cross it so it won't hurt them at all, and it looks like only the top ring will touch them near TDC, so again, who cares.

I've seen far FAR worse run great with no compression or consumption issues.
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Re: Machined block, ok or not?

Post by cjperformance »

Dan Timberlake wrote: Sun Nov 18, 2018 1:59 pm I do like the idea of getting iron oxide chunks and flakes out of the pits somehow, before going into service.
My reasoning (?) it will be one, (or ten) fewer things for the rings to have to deal with.
If really bothered, position the block so the rusty area is the low point, build a clay dam around it, pour in white vinegar and soak for a few hours, high pressure wash the dissolved rust out then oil well right away.
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Re: Machined block, ok or not?

Post by John@RED »

woody b wrote: Thu Nov 15, 2018 9:42 am Recurring theme?? https://www.speed-talk.com/forum/viewtopic.php?f=1&t=53204

I'm quite unlucky with blocks #-o
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Re: Machined block, ok or not?

Post by John@RED »

cjperformance wrote: Sun Nov 18, 2018 8:43 pm
Dan Timberlake wrote: Sun Nov 18, 2018 1:59 pm I do like the idea of getting iron oxide chunks and flakes out of the pits somehow, before going into service.
My reasoning (?) it will be one, (or ten) fewer things for the rings to have to deal with.
If really bothered, position the block so the rusty area is the low point, build a clay dam around it, pour in white vinegar and soak for a few hours, high pressure wash the dissolved rust out then oil well right away.


Good idea, thanks!
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