Thor Forums

[Long & Winding road]

Originally Posted by Chance

Your post made me smile — thanks.

You said you see my point, but then disagreed or questioned what I said as being incorrect. Which by the way is 100% OK with me. It’s a good thing.

I don’t have, and have never seen, a BSFC Map for the Ford V10, but take a look at this for another engine and see if it makes sense to you. The numbers will be different, but the general shape and principles are similar.

My previous comment may make more sense once you understand how most engines perform under different loads and speeds. If you have questions or want to discuss the technical aspects, please let me know.

The bottom line is that transmissions have gears for a reason. Ford engineers know the advantages of gear changes to vary speed and torque on engine, which is why they keep adding more gears. If they didn’t expect and want shifts, they wouldn’t be going from 6- to 10-speed.

Map below is for another older engine, not Ford V10.

Im glad I made you smile. This RV of mine has given me a desire to learn new things RV related. So thats a good thing (I guess but my pocket book is feeling the squeeze).

I never said your were incorrect ..... Im just trying to understand "why".

I just need to do my own research on this subject when I have time.

I was just point out that it seems more fuel efficient with lower RPM's as long as the engine is not bogged down.

I think the key with the 5 star is that instead of going from 6th to 4th right away it will try 5th gear to see if it can mantain the current speeds with the given load.

Its really a happy balance of gears, TQ, load, wind resistance and LEAD FOOT.