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#84539 10/21/2007 9:07 PM | Joined: Mar 2005 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2005 Posts: 92 | Anyone have any thoughts on max engine RPM for extended periods with a stovebolt 6. I have a stock '62 261, SM420, with a 3.9 rear and 30" tires. A RPM calculater tells me I would be turning 2850 rpm at 65 mph. Is this a engine RPM that I should be comfortable running for extended periods of time? I have always just gone by the sound of the engine so I really do not know RPM. TIA,
Steve O | | |
#84540 10/21/2007 11:51 PM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | Chevy sixes can be run at 3000 for extended periods without damage. I've run mine to 4500 under acceration but don't necessarily advise that everyday. Most people today are just sure they will blow up based almost entirely on the sound as you said. When I was a kid we ran the pants off them and nobody ever blew one up in my group. Changing the oil and having a filter go a long way toward keeping them fit. | | |
#84541 10/22/2007 12:31 AM | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | For my 55 235 I felt that 2500 was as fast as I liked for long periods of time. I would go faster for short times.
I drove my truck 8,000 miles in a month, and had no engine problems, and I feel it will last a long time at 2500.
Another thing, when I would go faster than that fuel mileage decreased significantly.
Grigg | | |
#84542 10/22/2007 2:19 PM | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | With out calculating the revs I'd like to read my RPM off a 6v tach. I've seen this discussed in several threads but can't remember if a source for them was ever mentioned. Is there????
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
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#84543 10/22/2007 2:38 PM | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 |
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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#84544 10/22/2007 3:42 PM | Joined: Aug 2002 Posts: 455 Shop Shark | | Shop Shark Joined: Aug 2002 Posts: 455 | All depends on the weight, terrain, coolant temperature and even wind drag of your car or truck.
My unloaded 4200 lbs. 1/2 ton truck and late 235 with 3.55 rear can go 2500-3000 rpm all day on relatively flat roads.
My 3000 lbs. coupe with a late 261 could go even higher with little drag or load on the engine...
On longer trips just keep an eye on coolant temp and oil pressure. | | | | | Joined: Nov 2006 Posts: 60 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2006 Posts: 60 | I HAVE RACED A WARMED UP 235'' FOR SEVERAL YEARS AND HAVE
ALWAYS SHIFTED AROUND 4500 TO 4700 RPM. OF COURSE I HAVE
USED TUBEULAR LIGHT WEIGHT PUSH RODS AND WE BALANCED ALL
THE ROTATING ASSEMBLY, INCLUDING THE DRIVE SHAFT AND YOU
WOULD BE SURPRISED HOW SMOOTH THEY RUN WHEN SET UP THAT
WAY. WITH THE REAR END GEARS I'M USING I GET ABOUT 20 MPH
PER 1000 RPM AND AT 3500 RPMS IM DOING 70 MPH, ANF I DON'T
HAVE A PROBLEM WITH THAT. HOPE THAT INFO HELPS.... | | |
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