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Positive thinking ...
We are still asking:
What did you
get done on
your Bolt today
????


The question, initially posted May 23, 2005, was:
"Whatcha do on your Bolt
this weekend?"

After 51,906,997 views, 7378 replies over 185 pages, this thread in General Truck Talk is a happening! And it's not just weekends anymore.


Now with pictures
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So ...


What did you get done on your Bolt today????


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Re: Best RPM To Run A 235 Babbet Power At????????????
don stocker #840391 Sun Apr 01 2012 05:23 PM
Joined: Jun 2011
Posts: 1,951
C
Shop Shark
Originally Posted by don stocker
Positive ground Kenneth?

Not for another decade or so.


Give me ambiguity
or give me something else
Re: Best RPM To Run A 235 Babbet Power At????????????
crenwelge #840411 Sun Apr 01 2012 06:12 PM
Joined: Apr 2005
Posts: 434
M
'Bolter
My numbers for the rpms 2600 is what the Randys Ring and Pinion calculator said. Tires 34.5, 5.43 ring and pinion at 50mph, 4 speed trans. Engine has 55,000 miles on it.

Marv.

Re: Best RPM To Run A 235 Babbet Power At????????????
crenwelge #840444 Sun Apr 01 2012 08:24 PM
Joined: Dec 2008
Posts: 1,707
P
'Bolter
Iron pistons were what kept engine speed down back in the day.

Re: Best RPM To Run A 235 Babbet Power At????????????
panic #840820 Tue Apr 03 2012 06:03 AM
Joined: Sep 2001
Posts: 586
M
Shop Shark
Panic,

I know you're correct, but I don't know WHY? What happens with the iron pistons that doesn't with aluminum (or whatever)? The iron get too hot, expand, and seize in the cylinder?

-Michael


Please type slow, as I can't read very fast.

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Re: Best RPM To Run A 235 Babbet Power At????????????
Mikestem #840829 Tue Apr 03 2012 06:57 AM
Joined: Jun 2011
Posts: 1,951
C
Shop Shark
I think they just weigh a lot more...


Give me ambiguity
or give me something else
Re: Best RPM To Run A 235 Babbet Power At????????????
CASO #840847 Tue Apr 03 2012 01:08 PM
Joined: Nov 2006
Posts: 2,658
D
Shop Shark
The cast iron pistons do weigh more than aluminum, they also take more time to warm up and fit the cylinder than aluminum. The amount of force put on the connecting rod is greater with the cast than the aluminum. If the engine gets hot enough to stick the piston to the cylinder wall your going to have bigger problems than a piston dragging against the cylinder wall. If it starts to stick to the cylinder wall you can figure on a bore job with new pistons at the least. I you ease your truck up to speed you should have no problem. I drive my '50 216 50 - 55 and just take it easy, once up to speed things go along just fine. With a bigger truck you may be a bit slower. Just take your time getting it up to speed.

Re: Best RPM To Run A 235 Babbet Power At????????????
don stocker #840858 Tue Apr 03 2012 01:59 PM
Joined: Dec 2009
Posts: 198
H
Shop Shark
The heaver piston has more inertia which puts more stress on engine components as the RPM goes up. (i.e) Newton's Law: When at rest, tends to stay at rest, when in motion tends to stay in motion. Pistons have to stop and start at the end of each stroke.
Easier with light pistons than heavy ones. One man's opinion.


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Re: Best RPM To Run A 235 Babbet Power At????????????
hankrags #840862 Tue Apr 03 2012 02:14 PM
Joined: Jan 2002
Posts: 2,241
C
'Bolter
I could never imagine running my 235 at anything near 3,000 rpms. With my Patrick's 3:55 gears and big tires I cruise 60mph at around 2,200 rpms. Purrs like a kitten.


Craig's '50 Chevy 3100 5 window
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If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
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