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How many RPM's can you twist a stock 440 ?
#1126719
12/03/11 02:20 PM
12/03/11 02:20 PM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
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OP
master
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Posts: 5,449
Woodbridge,CA
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I have a .040 over stock (pistons) 440 with a mild cam, 727 /Gear Vendors/3:23 that I regularly pound on. My trans doesn't like to shift until around 6000 RPM's at WOT and I think it's a little late. I've adjusted the kick down and it shifts great under regular driving conditions, but wants to whined a little too tight for my comfort zone. The engine is balanced and was built be a reputable builder. Should I be worried?
Last edited by NAS Backyard; 12/03/11 02:23 PM.
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Re: How many RPM's can you twist a stock 440 ?
[Re: NAS Backyard]
#1126721
12/03/11 03:26 PM
12/03/11 03:26 PM
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Joined: Jan 2003
Posts: 8,940
Holly/MI
Dean_Kuzluzski
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master
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Holly/MI
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That's kind of a vague question.
The rpm range is dictated by the cam/intake/carb/heads/exhaust, the mass of the reciprocating lower end.... and so on.......
Reliability???? What max rpm with the heavy slugs a factory 440 used???? That's the real question. Probably not much over 6k.
You didn't mention the cam other than "mild". The package as a whole is probably overrunning the cams design. It's probably doing a "nose-over" deal where it's shifting past its peak.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: How many RPM's can you twist a stock 440 ?
[Re: NAS Backyard]
#1126725
12/03/11 04:17 PM
12/03/11 04:17 PM
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Joined: Oct 2004
Posts: 16,478
Canada
CrAzYMoPaRGuY
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Depends on the TACH too.  I drove the same 440 powered car for 9 years, raced it regularly for 9 years, knew it like the back of my hand. Shifted consistently exactly the same thousands of times. I never look at my tach while racing, and since my buddies were getting annoyed I bought an Autometer Sport Comp recall tach. It would consistently pull 6400 rpm on the tach every time. Once every 50 runs or so.... it would read 7100 rpm. Then it would go back to 6400 rpms again and again. It was weird. We tossed the engine in my buddy's car years later. It had a Sun Super Tach II, which must be a much more powerful tach.  He wound the engine over 8000 rpm!!!!!!!  I always wondered how his previous engine, which seemed mundane, was pulling 6500+ rpm! I had a tic-toc-tac that would allow me to CRUISE at 5500 rpm with a similar engine, no idea what was wrong with that one!!!! I almost wonder if some tachs are set for 6 bangers, the rpm I have seen.  Good stout 440s I have had were just over 6000rpm when I shifted, if the tachs were fairly accurate.
CrAzYMoPaRGuY
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Re: How many RPM's can you twist a stock 440 ?
[Re: RapidRobert]
#1126727
12/03/11 04:44 PM
12/03/11 04:44 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
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usa
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Quote:
Quote:
The engine is balanced and was built be a reputable builder. Should I be worried?
No & & if the preferred shift point is lower than 6K I'd change the governor weights to ch that then adj the kickdown seperately to where you want it to be & not use it to move the WOT shift points
probably good advice
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Re: How many RPM's can you twist a stock 440 ?
[Re: HYPER8oSoNic]
#1126729
12/03/11 05:21 PM
12/03/11 05:21 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
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I Live Here
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Overpriced Housing Central
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Run it up, note tach level when it blows up, back off 100-200 RPM...  How much it will wind and where it covers ground best are quite different. If the cam isn't crazy I bet it would like something less than 5500.
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Re: How many RPM's can you twist a stock 440 ?
[Re: HYPER8oSoNic]
#1126730
12/03/11 05:30 PM
12/03/11 05:30 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
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Florida STAYcation
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Quote:
with a "warmer" cam thrown in,
WARMER ? ... so what oven-temp is that ?
And THIS from a  who is  something-funny and  on his car all-the-time ...
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Re: How many RPM's can you twist a stock 440 ?
[Re: MoparforLife]
#1126732
12/03/11 06:20 PM
12/03/11 06:20 PM
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Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
Pacnorthcuda
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Kirkland, Washington
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Quote:
You are running way out of the peak power band.
Thats somewhat of an unknown--all he says is "Mild Cam", Maybe his mild isn;t what someone else would say is mild. 
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Re: How many RPM's can you twist a stock 440 ?
[Re: dOrk !]
#1126733
12/03/11 06:28 PM
12/03/11 06:28 PM
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Joined: Jan 2003
Posts: 541
chatham, Ilinois
fox
super street
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super street
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chatham, Ilinois
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Quote:
Quote:
with a "warmer" cam thrown in,
WARMER ? ... so what oven-temp is that ?
And THIS from a who is something-funny and on his car all-the-time ...
For street use I ussually prefer 280 to 290 degrees advertised!!!
Is that warm enough??!!LOL!
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Re: How many RPM's can you twist a stock 440 ?
[Re: NAS Backyard]
#1126735
12/03/11 07:07 PM
12/03/11 07:07 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
I have a .040 over stock (pistons) 440 with a mild cam, 727 /Gear Vendors/3:23 that I regularly pound on. My trans doesn't like to shift until around 6000 RPM's at WOT and I think it's a little late. I've adjusted the kick down and it shifts great under regular driving conditions, but wants to whined a little too tight for my comfort zone. The engine is balanced and was built be a reputable builder. Should I be worried?
Adjusting the Throttle valve(kickdown)Linkage doesn't do anything to the WOT shift point .'
Did you change the gov. weights to get that hi A WOT ? Stock they don't shift nearly that high , usually about 4800 or so ...
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Re: How many RPM's can you twist a stock 440 ?
[Re: DennisH ]
#1126738
12/03/11 10:17 PM
12/03/11 10:17 PM
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Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
moparmarks
I Live Here
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I Live Here
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Western Colorado High Desert
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Your build is probably peaking at about 5500 tops. Any RPM's over that is a waste.
I don't like taking a stock low end over 6000
The factory race manuals from the 70's that I wish I could find says 6500 max on a big block.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Depending if it's a bone stock rebuild with a "warmer" cam thrown in, you have to take in account the balancing also (might free up a few hundred more USEABLE rpm up top). If the heads
But it comes at a price, a motor is only as good as the builder, so beware. Parts meant for strong performance in the low and midrange portions of the tach do not produce power in the far RIGHT side of the dial! And the 
