66ninetyeightls

Can anyone with a 66 Ninety Eight or similar full size tell me what engine RPM I should expect to see at 60MPH(100KPH)??

I just got a new tach and its reading close to 5000RPM at that speed. I know that is WAY off and the tach is bad. I just want to know what I should be looking for when I install the replacemnt tach.

MDchanic

I don't have the specs at my fingertips, but I believe that a stock '66 should have anywhere from a 2:56 to maybe a 3:31 gear, so 5,000 RPM @60mph is out of the question.

Does the tach have a selector for number of cylinders?
Is it connected to the negative coil terminal (the one that goes to the points)?

- Eric

66ninetyeightls

Yeah its set to 8 cylinder and is connected to the coil negative. I'm pretty sure its just a bad tach as it was pretty cheap 2" unit.

72 cutlass455

Think it would be 2250 to 2600 could be as high as 3000 but would think it would be some where in that range.

AZ455

Not sure if this will help, but my Eighty-Eight turns around 2500 rpm @ 65-70mph.

Jaybird

Craig: My '67 Delta 88 has a 3.08 rear end. I had my tach recalibrated last year. It reads between 2500 and 2600 rpm at 60 mph. I run the correct diameter tires, 235/70/15 (28").

Jaybird

66ninetyeightls

Great thanks. I will check it out once I have a decent tach installed.

VikingBlue

Craig ... did you ever take your 11 x 5 inch wheels off the car ?

66ninetyeightls

You mean I can't run wheels from a Mini Cooper?