Machines - Page 40

fargon · 07-17-2019, 06:47 AM

It's a tank engine.

Rhianne · 07-17-2019, 08:07 AM

TW is right. HP is a calculation taken directly from the torque (HP = Torque lb-ft x RPM / 5252). The low HP figure is a result only of the low-revving nature of the engine.

Undertoad · 07-17-2019, 08:48 AM

https://en.wikipedia.org/wiki/Chrysler_A57_multibank

Quote:

The Chrysler A57 Multibank is a 30-cylinder 1,253 cu in (20.5 L) engine that was created in 1941 as America entered World War II. It was born out of the necessity for a rear-mounted tank engine to be developed and produced in the shortest time possible for use in the M3A4 Lee medium tank and its successor M4A4 Sherman medium tank. Each had lengthened hulls to accommodate the A57.

BigV · 07-18-2019, 09:55 AM

I'm curious about how those connecting rod internal bearing races work. They look like in the picture that there's a race on the bearings... Which makes me wonder how they got the bearing/race onto the crank.

Any help?

xoxoxoBruce · 07-18-2019, 10:10 AM

This crankshaft is a one piece and is heat treated and surface hardened. The connecting rods and bearing races are split in the middle. The bearing retainers are also split in half and assembled around the crankshaft, and split races are in the block and main bearing caps. The roller bearings run directly on the hardened crankshaft.

BigV · 07-18-2019, 10:38 AM

Thanks, key phrase "split races", is a new thing to me. I think I can imagine it now.

Thanks!

Diaphone Jim · 07-18-2019, 11:57 AM

Were the rollers illegal?

xoxoxoBruce · 07-18-2019, 09:59 PM

Oh yes, very. Especially NASCAR who wants to make everything same same. Using those bearings cut down on frictional losses and you could use a smaller oil pump that took much less parasitic power from the engine. Might be good for 5 mph compared to a legal engine, and in NASCAR that's huge. NHRA it would be OK in modified classes but very illegal in stock, SS, even FX classes.

BigV · 07-21-2019, 08:54 PM

hey tw

you're wrong about your unswerving devotion to the temple of horsepower.

Let me ask you this. When you have a nut on a bolt to remove (or tighten), do you, with your static, unchanging amount of personal horsepower, use your fingers and thumb, or do you use a wrench?

Clodfobble · 07-28-2019, 02:27 PM

Weird. Any idea of what the history/circumstances might be?

Griff · 07-28-2019, 03:25 PM

It's the site of Redstone quarries in North Conway NH. They quarried and polished granite like the massive column in the pic. I don't think they lasted long working from the late 1800's and shutting down sometime in the 1910's.

I didn't know the site was there until I rode into it.

Clodfobble · 07-28-2019, 04:00 PM

Granite's expensive, right? Is it not worth someone's effort to get in there and take that column? Or are there just too many trees in the way, do you think?

Griff · 07-28-2019, 04:17 PM

It's a state historic site now. I was surprised that amount of steel was still there. The column is accessible but there is a rail bed between it and the roads.

sexobon · 07-28-2019, 05:10 PM

You didn't ride your bike on top along the length of the column? After a balancing act like that, it could've been called Griffhenge.

xoxoxoBruce · 07-28-2019, 11:17 PM

It's amazing that machinery wasn't scrapped for the war effort.
Once you steal that column what on earth would you do with it?

07-17-2019, 06:47 AM	#1
fargon Person who doesn't update the user title Join Date: Dec 2005 Location: La Crosse, WI Posts: 8,924	It's a tank engine. __________________ Annoy the ones that ignore you!!! I live a blessed life I Love my Country, I Fear the Government!!! Heavily medicated for the good of mankind.

07-18-2019, 09:55 AM	#4
BigV Goon Squad Leader Join Date: Nov 2004 Location: Seattle Posts: 27,063	I'm curious about how those connecting rod internal bearing races work. They look like in the picture that there's a race on the bearings... Which makes me wonder how they got the bearing/race onto the crank. Any help? __________________ Be Just and Fear Not.

07-18-2019, 10:10 AM	#5
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	This crankshaft is a one piece and is heat treated and surface hardened. The connecting rods and bearing races are split in the middle. The bearing retainers are also split in half and assembled around the crankshaft, and split races are in the block and main bearing caps. The roller bearings run directly on the hardened crankshaft. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

07-18-2019, 10:38 AM	#6
BigV Goon Squad Leader Join Date: Nov 2004 Location: Seattle Posts: 27,063	Thanks, key phrase "split races", is a new thing to me. I think I can imagine it now. Thanks! __________________ Be Just and Fear Not.

07-18-2019, 09:59 PM	#8
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	Oh yes, very. Especially NASCAR who wants to make everything same same. Using those bearings cut down on frictional losses and you could use a smaller oil pump that took much less parasitic power from the engine. Might be good for 5 mph compared to a legal engine, and in NASCAR that's huge. NHRA it would be OK in modified classes but very illegal in stock, SS, even FX classes. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

07-17-2019, 08:07 AM	#2
Rhianne Nearly done. Join Date: Jul 2007 Location: Teetering on the edge. Posts: 1,134	TW is right. HP is a calculation taken directly from the torque (HP = Torque lb-ft x RPM / 5252). The low HP figure is a result only of the low-revving nature of the engine.

07-18-2019, 11:57 AM	#7
Diaphone Jim Junior Master Dwellar Join Date: Sep 2007 Location: Northern California Posts: 2,122	Were the rollers illegal?

07-21-2019, 08:54 PM	#9
BigV Goon Squad Leader Join Date: Nov 2004 Location: Seattle Posts: 27,063	hey tw you're wrong about your unswerving devotion to the temple of horsepower. Let me ask you this. When you have a nut on a bolt to remove (or tighten), do you, with your static, unchanging amount of personal horsepower, use your fingers and thumb, or do you use a wrench? __________________ Be Just and Fear Not.

07-28-2019, 02:27 PM	#10
Clodfobble UNDER CONDITIONAL MITIGATION Join Date: Mar 2004 Location: Austin, TX Posts: 20,012	Weird. Any idea of what the history/circumstances might be? __________________ My book My other book My spirit animal

07-28-2019, 03:25 PM	#11
Griff still says videotape Join Date: Feb 2001 Posts: 26,813	It's the site of Redstone quarries in North Conway NH. They quarried and polished granite like the massive column in the pic. I don't think they lasted long working from the late 1800's and shutting down sometime in the 1910's. I didn't know the site was there until I rode into it. Attached Images __________________ If you would only recognize that life is hard, things would be so much easier for you. - Louis D. Brandeis

07-28-2019, 04:00 PM	#12
Clodfobble UNDER CONDITIONAL MITIGATION Join Date: Mar 2004 Location: Austin, TX Posts: 20,012	Granite's expensive, right? Is it not worth someone's effort to get in there and take that column? Or are there just too many trees in the way, do you think? __________________ My book My other book My spirit animal

07-28-2019, 04:17 PM	#13
Griff still says videotape Join Date: Feb 2001 Posts: 26,813	It's a state historic site now. I was surprised that amount of steel was still there. The column is accessible but there is a rail bed between it and the roads. __________________ If you would only recognize that life is hard, things would be so much easier for you. - Louis D. Brandeis

07-28-2019, 05:10 PM	#14
sexobon I love it when a plan comes together. Join Date: Oct 2009 Posts: 9,793	You didn't ride your bike on top along the length of the column? After a balancing act like that, it could've been called Griffhenge.

07-28-2019, 11:17 PM	#15
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	It's amazing that machinery wasn't scrapped for the war effort. Once you steal that column what on earth would you do with it? __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

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