engine and drivetrain What is your Rpm at 65mph.4 Speed.

[Psymon]

After taking my first longer drive with my car I am wondering If my differential is not stock.

I have a rather stock engine with a stock 4 speed trans with a 32/36 weber carb.

185/70/13 wheels/tires.

What should my rpm be at around 60-65 mph. I checked my speedo with a gps app and the speed seems to be accurate.

Thanks

[oldfahrt]

Don't remember at 65 mph but at 75 mph cruising speed it's smack dab on 4200 RPM with 14" rims.

[dogmuddybuddy]

revs high huh?

my 1600 stock 4 spd just over 4k on the rpm

I have heard the term "beechcraft"

[nbristow01]

revs high huh?

my 1600 stock 4 spd just over 4k on the rpm

I have heard the term "beechcraft"

LOL after a few long road trips in my 4 speed 02 I often felt like I was sitting ina blender. Went to the 5 speed route and what a joy on the freeway.

[Psymon]

Actually, it's not high is why I was wondering. At 65 mph, I am around 3000-3200 rpm.

[LimeySteve]

Not sure at 65 but at 80mph I'm at 4000 RPM buzzing along like a good un , at 105 mph she's howlin' 185 70 13 's

[roadhog0]

At 4000 RPM I am doing an indicated 75 which is closer to 68 or 70. I have a 4 speed with a 3.91 and 195/50R15's. I really dont see how a 4 speed is that bad. I drive highway with it and it's really not all that bad.

[nbristow01]

Actually, it's not high is why I was wondering. At 65 mph, I am around 3000-3200 rpm.

Maybe your tach is acting up. Mine occassionally will run about 500-600 slower for whatever reason then will start reading normally...I am told it may be due to a poor ground but have not had time to check it yet

[dogmuddybuddy]

Actually, it's not high is why I was wondering. At 65 mph, I am around 3000-3200 rpm.

thats good and seems low for a stock I would love that kind of RPM's!

Seems like your rear end may have been re-geared

[HBChris]

When in doubt check the owner's handbook.

3000 rpm = 90 kph or 56 mph

4000 rpm = 120 kph or 74 mph

This is with the standard US 3.64 rear end of course. My car shows 75 at 4000 rpm or so.

Chris

[MMII73]

My tach used to read 3000 at 70 mph so I bought a dwell meter with a tach mode and discovered the tach was reading wrong. I changed the tach and everything was fine. There is a chart in the FAQ somewhere that will show what the revs should be. I think it's pretty common for a speedo to read high also.

[02Les]

Actually, it's not high is why I was wondering. At 65 mph, I am around 3000-3200 rpm.

Same as my '74 Touring.

In round numbers 3000rpm = 60mph, 3500 = 70mph, 4000 = 80mph.

I think I have a 3:64 diff.

The so-called hi rpms don't bother me. It really smooths out between 3500-4000rpm.

[Psymon]

Actually, it's not high is why I was wondering. At 65 mph, I am around 3000-3200 rpm.

Same as my '74 Touring.

In round numbers 3000rpm = 60mph, 3500 = 70mph, 4000 = 80mph.

I think I have a 3:64 diff.

The so-called hi rpms don't bother me. It really smooths out between 3500-4000rpm.

ok so it sounds like everything is as it should be stock.

[mrdew]

GPS Verified

4,000 RPM is 65mph

[Psymon]

GPS Verified

4,000 RPM is 65mph

Now why am I at 3200 rpm at the same speed?