narrow rod bearings for 347 ford?

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rewguy
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narrow rod bearings for 347 ford?

Post by rewguy » Tue Apr 09, 2019 7:43 pm

I have a 347 ford with chevy dia. journals. I used a 663HN bearing, which fits the housing bore perfectly, but overhangs out the side of the rod about .040. I'm sure there's a specific bearing for this app.....but not sure what it is. The rods are older (but new) eagle H beam.

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Re: narrow rod bearings for 347 ford?

Post by kcengines » Tue Apr 09, 2019 7:52 pm

Clevite 1227

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Re: narrow rod bearings for 347 ford?

Post by engineguyBill » Tue Apr 09, 2019 10:53 pm

Many professional engine builders have fixtures/tooling for narrowing bearings. The CB-663 series is very popular and there were several companies offering tools for narrowing these bearings, such as Bill Mitchell Products, Goodson, etc.
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Re: narrow rod bearings for 347 ford?

Post by Charliesauto » Wed Apr 10, 2019 12:37 am

rewguy wrote:
Tue Apr 09, 2019 7:43 pm
I have a 347 ford with chevy dia. journals. I used a 663HN bearing, which fits the housing bore perfectly, but overhangs out the side of the rod about .040. I'm sure there's a specific bearing for this app.....but not sure what it is. The rods are older (but new) eagle H beam.
ACL has them also, 8B1227H

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Re: narrow rod bearings for 347 ford?

Post by MotionMachine » Wed Apr 10, 2019 8:22 am

Those are the old 200 and 229 Chevy V6 bearings.

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Re: narrow rod bearings for 347 ford?

Post by Walter R. Malik » Wed Apr 10, 2019 10:58 am

MotionMachine wrote:
Wed Apr 10, 2019 8:22 am
Those are the old 200 and 229 Chevy V6 bearings.
YES ... pretty common for a 2.100" diameter journal but, having a 302 FORD width.
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Re: narrow rod bearings for 347 ford?

Post by BillK » Wed Apr 10, 2019 8:52 pm

Pretty sure Clevite has them listed in an "H" bearing also. In the performance section of the catalog under "custom"
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Re: narrow rod bearings for 347 ford?

Post by PackardV8 » Thu Apr 11, 2019 10:47 am

Just asking, if the overhang doesn't get into a large radius on the crank cheek, has anyone seen damage resulting from the extra width?
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Re: narrow rod bearings for 347 ford?

Post by Kevin Johnson » Thu Apr 11, 2019 1:24 pm

PackardV8 wrote:
Thu Apr 11, 2019 10:47 am
Just asking, if the overhang doesn't get into a large radius on the crank cheek, has anyone seen damage resulting from the extra width?
Just speaking theoretically...

If the bearing overhang extends past the inner cheek of the rod and the freedom of movement in the rod pair allows the two adjacent bearing sets to meet, the flow of oil and rejection of heat could be restricted and that will negatively affect the temperature gradient of the bearing shell, possibly leading to failure. This inner rod-cheek overhang may or may not be coincidental with getting into the large radius on the crank cheek; not all rods are symmetrical in that respect.

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Re: narrow rod bearings for 347 ford?

Post by Sumtingwong » Thu Apr 11, 2019 2:52 pm

DOes anyone know what the losses in friction from narrowed bearing effect on horsepower is/////?

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Re: narrow rod bearings for 347 ford?

Post by In-Tech » Thu Apr 11, 2019 3:05 pm

:lol: :lol: :lol: Sorry, the bearing width has nothing to do with much unless it actually touches the crank.
Heat is energy, energy is horsepower...but you gotta control the heat.
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