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Crank scraper maybe little too tight?

General engine tech -- Drag Racing to Circle Track

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ptuomov
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Crank scraper maybe little too tight?

Post by ptuomov » Sun Feb 09, 2020 8:18 pm

The windage trays maybe a little tight in this engine?
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Re: Crank scraper maybe little too tight?

Post by Kevin Johnson » Sun Feb 09, 2020 8:25 pm

Trim back the drawer handles a little. Should be fine.

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Re: Crank scraper maybe little too tight?

Post by af2 » Sun Feb 09, 2020 8:26 pm

Self clearance?
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Re: Crank scraper maybe little too tight?

Post by Dave Koehler » Sun Feb 09, 2020 8:37 pm

Just to cover the bases did you have the rods resized lately?
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Re: Crank scraper maybe little too tight?

Post by ptuomov » Sun Feb 09, 2020 8:40 pm

Dave Koehler wrote:
Sun Feb 09, 2020 8:37 pm
Just to cover the bases did you have the rods resized lately?
Yep, those were rebuilt. I don’t recall those marks after the rods were rebuilt, but that doesn’t mean anything.

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Re: Crank scraper maybe little too tight?

Post by Dave Koehler » Sun Feb 09, 2020 8:49 pm

ptuomov wrote:
Sun Feb 09, 2020 8:40 pm
Dave Koehler wrote:
Sun Feb 09, 2020 8:37 pm
Just to cover the bases did you have the rods resized lately?
Yep, those were rebuilt. I don’t recall those marks after the rods were rebuilt, but that doesn’t mean anything.
I think you will find all the rods have that rub mark.
Plus your scraper is cut to clear the big end of the rod is it not?
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Re: Crank scraper maybe little too tight?

Post by ptuomov » Sun Feb 09, 2020 8:57 pm

Dave Koehler wrote:
Sun Feb 09, 2020 8:49 pm
ptuomov wrote:
Sun Feb 09, 2020 8:40 pm
Dave Koehler wrote:
Sun Feb 09, 2020 8:37 pm
Just to cover the bases did you have the rods resized lately?
Yep, those were rebuilt. I don’t recall those marks after the rods were rebuilt, but that doesn’t mean anything.
I think you will find all the rods have that rub mark.
Plus your scraper is cut to clear the big end of the rod is it not?
Yes. The marks were a mystery to me, but if they came from resizing the rods then that’s a logical explanation. I threw out the windage tray hypothesis, even though the geometry doesn’t really make that explanation terribly likely.

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Re: Crank scraper maybe little too tight?

Post by ptuomov » Sun Feb 09, 2020 8:59 pm

Kevin Johnson wrote:
Sun Feb 09, 2020 8:25 pm
Trim back the drawer handles a little. Should be fine.
I think the scraper/windage tray sheets clear the big end, where the geometry is tighter.

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Re: Crank scraper maybe little too tight?

Post by SupStk » Mon Feb 10, 2020 1:00 pm

af2 wrote:
Sun Feb 09, 2020 8:26 pm
Self clearance?

That would be my guess too. From the marks, I'd say both end of the rods were sized.

That isn't the part of the rod that's closest to a windage tray or scraper.
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Re: Crank scraper maybe little too tight?

Post by ptuomov » Mon Feb 10, 2020 1:48 pm

SupStk wrote:
Mon Feb 10, 2020 1:00 pm

That would be my guess too. From the marks, I'd say both end of the rods were sized.

That isn't the part of the rod that's closest to a windage tray or scraper.
That’s where the marks came from, so mystery is solved. Windage tray comment was just for fun, they obviously can’t touch the rod so high up.

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Re: Crank scraper maybe little too tight?

Post by Dan Timberlake » Mon Feb 10, 2020 6:49 pm

As others said -
https://www.statesidetuning.co.uk/machining/rods2.JPG

Honing pin bushings is not my favorite, except for tweaking clearance after rod straightness is measured and confirmed satisfactory.

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