Safe Rev Limit for 440?
#970713
04/10/11 08:04 PM
04/10/11 08:04 PM
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Joined: Jun 2004
Posts: 3,416 St. Charles, MO
wingman
OP
Uncreative Title
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OP
Uncreative Title
Joined: Jun 2004
Posts: 3,416
St. Charles, MO
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I know this question involves a ton of variables, and probably some opinion, but... The MSD ignition 6AL box I got free only came with a 7000 pill, and I know that is too high. The motor is a 71 block, 9.5 compression with mostly stock internals except for forged .30 over TRW pistons and good quality valves. Crank and rods appear to be stock. I don't race the car, I just use it for cruising and fiddling around town. But with the steep gears my car has, fairly loose converter, and manual valve body, I'm afraid I'm going to miss a shift someday and be sorry. What would be a good pill (or set of pills) to get that will keep the motor safe--but not too safe?
1969 Dodge Coronet Super Bee 383 A4 1970 Plymouth Road Runner 440 FC7 (sold)
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Re: Safe Rev Limit for 440?
[Re: gch]
#970717
04/10/11 09:52 PM
04/10/11 09:52 PM
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Joined: Jan 2003
Posts: 5,186 Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
You never mentioned what cam you are running.What rpm do you shift at?I would put a 6000rpm pill in it and call it a day.
I shift at 6000 and have my limiter set at 6300. I can dial mine. I don't want to run up against it. So if you're shifting at 5500 to 5800, a 6000 pill should do the trick.
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Re: Safe Rev Limit for 440?
[Re: DaytonaTurbo]
#970719
04/10/11 10:15 PM
04/10/11 10:15 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
I would also rev it to 6000 without worrying.
It may stay together and may or may not even float the valves in a stock 440 at 6000 but why twist it that far when it will peak long before that and you will be far better off shifting earlier. (and easier on the motor too)
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Re: Safe Rev Limit for 440?
[Re: MoparforLife]
#970720
04/10/11 11:16 PM
04/10/11 11:16 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:
Quote:
I would also rev it to 6000 without worrying.
It may stay together and may or may not even float the valves in a stock 440 at 6000 but why twist it that far when it will peak long before that and you will be far better off shifting earlier. (and easier on the motor too)
The op hasn't said what he's got for cam and head flow, but I agree that if it's out of breath long before 6000 there's no point in taking it that high. But if it was peaking out higher in the rpm range I wouldn't sweat taking it to 6k.
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Re: Safe Rev Limit for 440?
[Re: quickd100]
#970723
04/11/11 09:13 AM
04/11/11 09:13 AM
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Joined: Jan 2003
Posts: 5,920 Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,920
Athens, Greece
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Not to hijack...but do they make a 1500 pill or a 2000 pill that you can put in the MSD box....and render the engine useless when you park it somewhere....If you cant get past a low rpm....thats a pretty good theft deterrent device OR if you have kids in the house...Latter doesnt apply to me.
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: Safe Rev Limit for 440?
[Re: Pyper70]
#970725
04/11/11 11:28 AM
04/11/11 11:28 AM
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Joined: Nov 2007
Posts: 21,909 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,909
Kirkland, Washington
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Quote:
Not to hijack...but do they make a 1500 pill or a 2000 pill that you can put in the MSD box....and render the engine useless when you park it somewhere....If you cant get past a low rpm....thats a pretty good theft deterrent device OR if you have kids in the house...Latter doesnt apply to me.
Why not just unplug the distributor connection or pull the coil wire?
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Re: Safe Rev Limit for 440?
[Re: Cudajon]
#970727
04/11/11 04:49 PM
04/11/11 04:49 PM
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Joined: Jan 2003
Posts: 21,122 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,122
Niles , Ohio
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I have my limiter set at 6800 on my 440.Its been well over that though.Still pulls strong when I shift.All ARP lower with studs.Been doing it for 5 years and no problems.Stockish 440 will probally be done at 5600 or less.Rocky
Chrysler Firepower
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Re: Safe Rev Limit for 440?
[Re: Pyper70]
#970731
04/11/11 07:20 PM
04/11/11 07:20 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
Quote:
Quote:
Not to hijack...but do they make a 1500 pill or a 2000 pill that you can put in the MSD box....and render the engine useless when you park it somewhere....If you cant get past a low rpm....thats a pretty good theft deterrent device OR if you have kids in the house...Latter doesnt apply to me.
Why not just unplug the distributor connection or pull the coil wire?
Then I have to pop the hood...I have my box mounted right on top of the center console....directly behind my ashtray...I can stick my hand under there and the pill is right there....
I put the 3,000 chip in the 'Cuda when the wife wanted to drive it to the store one time. It took her a while to tell me that she thought she broke it! LOL!
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