How high do you rev your 304? - JeepForum.com

 
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post #1 of 8 Old 05-21-2004, 12:17 PM Thread Starter
Marc CJ7
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How high do you rev your 304?

Curious how high everyone takes there engines to? I am 100% stock internally and I usually shift at @3000 rpm. Once and I while I will take it up to 3500 and I might have shifted at 3800 once or twice but the motor is screaming at that speed. Does anyone know what the powerband on these engines looks like? I have never seen a dyno for a 304 before.


82 CJ7 - 304 / T5
98 GTI VR6
All Motor: 1.89 - 13.55 @ 101.60
12.641 @ 110mph - spraying
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post #2 of 8 Old 05-21-2004, 12:30 PM
JERSEYJOE
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Reving a 304

Quote:
Originally Posted by Marc CJ7
Curious how high everyone takes there engines to? I am 100% stock internally and I usually shift at @3000 rpm. Once and I while I will take it up to 3500 and I might have shifted at 3800 once or twice but the motor is screaming at that speed. Does anyone know what the powerband on these engines looks like? I have never seen a dyno for a 304 before.

A stock AMC 304 or 360 will rev to 5500. The limiting factor in most higher mileage enignes is the condition of the valve springs. With a fresh set of springs, ever a 2 bbl 304 will survive short bursts to 5500. NOT SUSTAINED RUNNING. A mildly modified 304 or 360 with exhaust, intake carb, mild cam will pull to 5800-6000.
The internals will take a good amount of abuse.
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post #3 of 8 Old 05-21-2004, 08:27 PM
74RED
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with older engines its usually not a question of powerband but more on oil pressure. if you do not have a pressure guage ( that reads psi ) i would suggest getting one they are cheap and install in about 10 minutes. with a small engine like your 304 cold should be between 60- 75 maybe 80 and warm shouldnt top 65. anymore than that and you risk high dollar damage.
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post #4 of 8 Old 05-22-2004, 07:28 AM
GoldenEagle
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I take mine to 4500 once in a while. Doesn't seem to bother it, but I don't do it all the time.

1979 CJ7 Golden Eagle, 304 V8, 32x11.50R15 BFG Mud Terrain tires, hard top.
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post #5 of 8 Old 05-23-2004, 11:47 PM
Barton
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Ocassionally I will rev upto 5500 but it lasts for a tenth of second before the auto-transmition shifts to second. I typically do this with I need to get up to interstate hiqhways with short on-ramps.


Make: Cherokee XJ Limited
Year: 2000
Color: White
Engine: 4.0L V6
Transmition: SelecTrac AWD
Tires: P205/R15
Wheels: Stock 16"

Soon:
315/75R16 - Radial Mud Terrain T/A KM
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post #6 of 8 Old 05-24-2004, 02:24 PM
MR.CJ-7
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I run mine all the time on the highway at 3600 rpm. I have 4.56's and no overdrive.

How do you get oil psi to 60-75???

All the literature I have seen shows these as much lower(30 psi) for normal.

Mine both before and after rebuild runs about 10 psi when warm. 25-30 cold.

Maybe mine is just weird

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post #7 of 8 Old 05-24-2004, 03:06 PM Thread Starter
Marc CJ7
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Quote:
Originally Posted by MR.CJ-7
I run mine all the time on the highway at 3600 rpm. I have 4.56's and no overdrive.

How do you get oil psi to 60-75???

All the literature I have seen shows these as much lower(30 psi) for normal.

Mine both before and after rebuild runs about 10 psi when warm. 25-30 cold.

Maybe mine is just weird

thats more in line with my jeep. On cold days w 5w-30 on startup I see 60-80 psi but once everything is at normal operating temp its 8-10psi at idle and 10 psi per 1000 rpm. I have been told that 10psi per 1000 rpm is normal for most engines.

82 CJ7 - 304 / T5
98 GTI VR6
All Motor: 1.89 - 13.55 @ 101.60
12.641 @ 110mph - spraying
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post #8 of 8 Old 05-26-2004, 02:04 PM
JERSEYJOE
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oil pressure

Quote:
Originally Posted by Marc CJ7
thats more in line with my jeep. On cold days w 5w-30 on startup I see 60-80 psi but once everything is at normal operating temp its 8-10psi at idle and 10 psi per 1000 rpm. I have been told that 10psi per 1000 rpm is normal for most engines.

The AMC factory manual states that "normal" oil pressure is 13 psi at idle hot. This means after you drive on the highway for about 20 minutes. Having had many many AMC motors, I have found that the usual problem with an engine that has great cold oil pressure and low hot oil pressure is a worn front cover. Since the oil pump is housed there, the pump gear to housing clearance gets too large, and hot oil pressure goes out the window. Unless it's a real high mileage motor with main and or rod bearing problem, the problem is in the cover.
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