What’s a comfortable safe RPM for the 1HZ on the HWY ?
I have been running 2600 RPM seen pretty good
I have been running 2600 RPM seen pretty good
1HZ RPMs
- Thread starter Broski
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Hello,
What is your speed at 2600 rpm?
A 1HZ engine purrs along between 2000 and 2600 rpm. As you can see, at 2600 rpm you have enough power.
Although it was not designed with American highways in mind, a 1HZ engine can handle 55 mph. At 2600 rpm, I guess you drove faster than that. Moreover, you get maximum power at 3800 - 4000 rpm, depending on how old your engine is.
Remember to watch both gear and your right foot on climbs and mountain passes. And keep in mind that a 1HZ has about the same power as a 2F, but it is not as thirsty.
Juan
What is your speed at 2600 rpm?
A 1HZ engine purrs along between 2000 and 2600 rpm. As you can see, at 2600 rpm you have enough power.
Although it was not designed with American highways in mind, a 1HZ engine can handle 55 mph. At 2600 rpm, I guess you drove faster than that. Moreover, you get maximum power at 3800 - 4000 rpm, depending on how old your engine is.
Remember to watch both gear and your right foot on climbs and mountain passes. And keep in mind that a 1HZ has about the same power as a 2F, but it is not as thirsty.
Juan
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- Thread starter
- #3
This rig has 33” tall tires ( rubber overdrive)
Per the GPS on my phone 2600 RPMs is right at 70 MPH
This 1HZ seems to run really cool if the OEM gauge is working right.
My guess is that the thermostat is stuck open or has been removed.
Ambient temperatures have been really cool.
I thought the gauge wasn’t working at all because the needle was laying right at the bottom. Just above the line when driving around town and at low speed.
But when on the HWY and or climbing hills it moves to about a 1/4 of the gauge.
IMO 2600 RPM seems to be the sweet spot
Might not be a a viable comparison, but I have a 15B-FT in my BJ70 and the temps remain similarly low year round. It is nice to cruise at speed without recurring power or cooling concerns.
Like you, running 33" tires but with 3.73 ratio in the axles and 10% OD in the transfercase. This yields 70~72mph at 2200rpm. This is a sweet spot for me ... enough speed to cover ground on long trips while averaging 21-23mpg. The sweeter spot for mpg's is highway cruising (versus interstate), where the speed limits are 55/60mph, which yields 25-27mpg.
Have fun mapping out what is best in your new addition
Hello,
Yes, 2600 rpm is something the 1HZ can handle all day.
Unless tampered with, factory temperature and oil pressure gauges are more reliable than they look. I think your water temperature sender and thermostat are working properly, but you may want to take a closer look.
You can also pull over after driving and check the engine block temperature. If you get 182 F to 190 F, that is the temperature at which the needle is at around one quarter of the gauge. The same temperature after two or three measurements indicates that the cooling system is working fine.
Juan
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