Re: cruising rpm
[Re: can.al]
#1567172
01/22/14 08:04 PM
01/22/14 08:04 PM
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Joined: Oct 2009
Posts: 440 Canada
Dons Dart
mopar
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mopar
Joined: Oct 2009
Posts: 440
Canada
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Quote:
what would you say is an acceptable rpm to cruise at for an extended trip? ..would 2800 - 3000 be 28 would make me feel better + save on gaspushing it on a 2 or 3 hour period?
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Re: cruising rpm
[Re: stumpy]
#1567175
01/22/14 09:41 PM
01/22/14 09:41 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
That range should be fine for any engine.
doesnt hurt anything to run some rpm for a while. my dd runs 3500 at 75 all the time.
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Re: cruising rpm
[Re: DaytonaTurbo]
#1567176
01/23/14 12:31 AM
01/23/14 12:31 AM
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Joined: Oct 2008
Posts: 96 Nampa, Idaho
Wyle E Coyote
member
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member
Joined: Oct 2008
Posts: 96
Nampa, Idaho
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I've heard from a few engine builders that the "optimum" RPM for efficiency is the spot where the HP and Torque curves cross. If you have the cam chart of course. Otherwise, a run like that is good once in a while. For me, I like to stay about 2200-2300 for a big block and 2500-2700 for a small block for long runs.
25 Dodge Roadster 66 D100 440/727 (on 72 D100 chassis) 67 W200 360/727 72 IH TravelAll 1110 4x4 345/727/NP205 76 Scout 2 360/727/D20 '08 Dakota SLT Quad Cab 4wd 4.7L
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Re: cruising rpm
[Re: Wyle E Coyote]
#1567177
01/23/14 12:39 AM
01/23/14 12:39 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Only problem with that, is that since HP is a measure of torque over time, every HP/torque curve crosses at 5200 rpm. I don't know any V8 that cruises best at 5800 rpm...
**Photobucket sucks**
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Re: cruising rpm
[Re: can.al]
#1567180
01/23/14 12:03 PM
01/23/14 12:03 PM
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Joined: Oct 2009
Posts: 440 Canada
Dons Dart
mopar
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mopar
Joined: Oct 2009
Posts: 440
Canada
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Quote:
..yes.small cam and 340 i have both 3.55 and 3.23 and i'm thinking 3.23 would be better for this combo
yep i would take that 355 off your hands lol.looking forward to seeing your Dart one day AL
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Re: cruising rpm
[Re: Dons Dart]
#1567181
01/23/14 12:26 PM
01/23/14 12:26 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Some of you guys and your responses....
In any case, 3500rpm all day wont hurt a thing.
I do agree that RPMs drive me freakin nuts. Cant stand much over 3200 for a sustained period of time.
BTW, some of the DW guys have stones of steel, IMO. One member has made it the last 2 years. 3.91s, 26 inch tires and 3500 rpms for 2400 miles. I bow down, I cant do it.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: cruising rpm
[Re: Dons Dart]
#1567183
01/23/14 02:39 PM
01/23/14 02:39 PM
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Joined: Feb 2009
Posts: 1,274 Ontario.Canada
can.al
OP
pro stock
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OP
pro stock
Joined: Feb 2009
Posts: 1,274
Ontario.Canada
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Quote:
Quote:
..yes.small cam and 340 i have both 3.55 and 3.23 and i'm thinking 3.23 would be better for this combo
yep i would take that 355 off your hands lol.looking forward to seeing your Dart one day AL
...should be ready for early spring if there are no hiccups.
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Re: cruising rpm
[Re: can.al]
#1567184
01/23/14 04:16 PM
01/23/14 04:16 PM
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Joined: Apr 2007
Posts: 2,918 Calgary, Alberta Canada
a12rag
master
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master
Joined: Apr 2007
Posts: 2,918
Calgary, Alberta Canada
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Guess it pretty much is going to depend on what you have for cam, convertor, gear and tire . . .
In my 74 Duster360 with 727, have swapped out the original 8.25 rear end with 3:55 for a 8.25 with 2.45 !!! Cruising at 70mph all day, running 2600rpm (about 23mpg at that speed too!). . . 360 has tons of torque to roast the one tire . . .
70 Sport Satellite with 360, 727, 3.23:1 . . . no tach, so not sure of rpm, but runs 75 - 85mph all day, no issue . . .
Now if the car is a 4:10 rear end . . .RPMS for sure !!!
Build it for what you want/how you drive . . .
Cheers,
Mark
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Re: cruising rpm
[Re: 5spdcuda]
#1567186
01/23/14 07:19 PM
01/23/14 07:19 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I run the highway all the time with my 4.30's and 30" tall tires. It runs about 3200 rpm at 60 mph and I drive it the 1-1/2 hr trip to Carlise crusin at 3200 rpm all the way and never no trouble. Ron
Last edited by 383man; 01/23/14 07:23 PM.
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Re: cruising rpm
[Re: cjskotni]
#1567188
01/24/14 12:57 AM
01/24/14 12:57 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Someday I hope to go the GV route or Kiesler 4 speed auto but not in the budget now, sadly.
Uhhh... GOOD luck with that Keisler thing....
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