|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-04-2014, 09:12 AM | #21 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Highway speed rpm
Quote:
|
|
09-04-2014, 04:26 PM | #22 | |
Junior Member
Join Date: Jun 2014
Posts: 13
|
Re: Highway speed rpm
Quote:
sorry it doesn't come up as a link this site has stats, acceleration power curves, etc for many older cars including fords. google: 1950 ford specs is the first search result |
|
Sponsored Links (Register now to hide all advertisements) |
|
09-04-2014, 04:46 PM | #23 |
Senior Member
Join Date: May 2010
Location: Napier, New Zealand
Posts: 2,001
|
Re: Highway speed rpm
The place to find true torque figures as per dyno results is JWLs book, Flathead Facts.
|
09-04-2014, 05:57 PM | #24 |
Senior Member
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
|
Re: Highway speed rpm
Kevin,
To answer your question, in my opinion you can't hurt a sound flathead engine by running it all day, every day at modern freeway speeds, regardless of the rear end ratio or tire size. By "sound" of course, I mean it's in good mechanical condition, runs properly, doesn't ping at speed, and doesn't overheat. If it suffers from one or more of these conditions, then the advice would, necessarily, be different. These are very tough engines and were designed to be run hard, as long as they were in good tune and condition. I do agree with the prior posts, however, that flatheads do seem to have a "sweet spot" so far as cruising speed...usually somewhere around 60 - 65 mph...you know it when you hit it...they just sing along...they'll go faster, and you won't hurt them, but they're not as happy. |
09-04-2014, 06:23 PM | #25 |
Senior Member
Join Date: Jul 2014
Location: Iowa
Posts: 1,634
|
Re: Highway speed rpm
I have the original wide open throttle performance curves chart showing curves for mechanical efficiency, compression, torque, spark advance, and brake horsepower. Ford used the mechanical efficiency at 3000 rpm to achieve the advertised 95 horsepower. Engines were tested with generator and water pumps, but without fan or muffler. The true "sweet spot" is where horsepower and torque curves cross, That is just over 2100 rpm. Depending upon the gearing, that should fall in the 50-55 mph range.
|
09-04-2014, 07:39 PM | #26 |
Senior Member
Join Date: May 2010
Location: Ottawa, Illinois
Posts: 401
|
Re: Highway speed rpm
Sponsored Links (Register now to hide all advertisements)
|
09-04-2014, 08:00 PM | #27 | |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: Highway speed rpm
Quote:
|
|
09-04-2014, 10:00 PM | #28 |
Senior Member
Join Date: May 2010
Location: South Texas
Posts: 1,631
|
Re: Highway speed rpm
I didn't mean to be antagonistic, my apologies.
I find most flatheads run well up to around 2700 r.p.m. My 53 sedan has the standard non-overdrive 3.92 ratio axle (I added the overdrive). With the 28 in tall tires I run up to 80 m.p.h. in overdrive comfortably. |
09-04-2014, 10:36 PM | #29 | |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
|
Re: Highway speed rpm
Quote:
|
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|