Proper Speed on freeway for a good longterm engine

[clearcut]

I have a 1967 Land Rover stock, with a over drive added

I over drive added is BL Components, Kit part No. GLR 120

I have 750 x 16 tyres

So at 55 MPH, how many RPM is the engine running.. How hard you run your engine. This engine has had a full rebuild, with about 5,500 miles on it



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[SafeAirOne]

Not sure what the Fairey overdrive gear ratio is compared to the Rover(Roamer)Drive ratio, but the last chart here on TeriAnn's page shows engine RPM at 65 MPH for various RoverDrive-equipped vehicles:

http://www.expeditionlandrover.info/gear_ratio.htm


If you know the gear ratio on your Fairey overdrive, there is enough information on the rest of TeriAnn's page to figure out your particular setup's engine RPM @ 55mph.

I suspect you can go 55mph forever with a 2.25 and an overdrive. Likely more.

[greenmeanie]

Flat out.

Keep up with he PM and they can be wound out all day.

[clearcut]

Flat out.

Keep up with he PM and they can be wound out all day.

thanks a lot

josh

[Ncrover725]

I drove my 109 (2.25 Petrol) with a Santana Overdrive from Maine to North Carolina between 55mph and 60mph the entire time. No issues. As my daily driver I drive 55 to work daily with no issues.

[TeriAnn]

I put a tach in my truck sometime around 1980. Just from driving around i have concluded they the Land Rover 4 cyl petrol seems to be happiest somewhere between 3000 and 3400 RPM. I also seem to get the best fuel mileage in that RPM range.

I know people who keep the revs up around 4000 on the freeway but their engines don't seem to last quite as long and the rebuild includes boring the cylinders out because they have become oval.

My advice is get a tach and listen to your engine and get a feeling for how it performs at different RPMs on a hill. I always downshifted a couple hundred RPMs above peak torque on hills. My truck has had a V8 since 1999 and I still drive with the tach determining my gear.