Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 09-16-2009, 11:35 PM
bill11012's Avatar
bill11012 bill11012 is offline
Modular motor junkie
 
Join Date: May 2009
Location: Texas
Posts: 6,190
bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.
460 best cruising rpm?

I have a 83 F350 DRW and I am putting a ZF 5 peed in. I am also putting new diffs in front and back. trying to get rear gear for for highway, and I have a set of 3.55s that would have it turning at about 1800 to 2100 during normal highway driving. Is that a good gear set up/cruising speed?
I am going for MPG and towing, I have no problem down shifting at every hill towing if that is what it takes it get better MPGs.
thanks
bill
__________________
My V10 will out pull your PSD any day of the week,
If its close to stock and of the same age as my V10.

My IDI can't out pull anything.
Reply With Quote
  #2 (permalink)  
Old 09-17-2009, 11:32 PM
ClydeSDale's Avatar
ClydeSDale ClydeSDale is offline
Elder User
 
Join Date: Apr 2003
Location: Minnesota
Posts: 834
ClydeSDale is gaining momentum as a positive member of FTE.
I ran a small fleet of F250HD's towing ridiculous! loads on gooseneck trailers from the late 70's to the early 90's. The sweet spot for 460's mileage seemed to be 3.08's direct running solo but most of ours were 4.10's. To many RPM's is overspeed, too few is lugging. Not sure what the OD ratio is on a ZF is but you can go from there.
__________________
Roger


Clyde S Dale, Camper Pulling Workhorse
1984 F250HD XLT RCLB 4X2 8600 GVW 460 ^Timing C6 Track-loc 4.10's
Trailer Towing/Camper Pkg K&N in/DynoMax out All synth fluids, fully temp gauged
4-core HeatbusteR radiator, dual OE plate type tranny coolers 74,000 original miles (and counting)
ClydeSDale Photo Album
Reply With Quote
  #3 (permalink)  
Old 09-17-2009, 11:40 PM
bill11012's Avatar
bill11012 bill11012 is offline
Modular motor junkie
 
Join Date: May 2009
Location: Texas
Posts: 6,190
bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.
Quote:
Originally Posted by ClydeSDale View Post
I ran a small fleet of F250HD's towing ridiculous! loads on gooseneck trailers from the late 70's to the early 90's. The sweet spot for 460's mileage seemed to be 3.08's direct running solo but most of ours were 4.10's. To many RPM's is overspeed, too few is lugging. Not sure what the OD ratio is on a ZF is but you can go from there.
thanks, I think the ratio on OD is .71 to 1, same as a E4OD.
__________________
My V10 will out pull your PSD any day of the week,
If its close to stock and of the same age as my V10.

My IDI can't out pull anything.
Reply With Quote
  #4 (permalink)  
Old 09-18-2009, 10:09 AM
radamx2's Avatar
radamx2 radamx2 is offline
New User
 
Join Date: Mar 2007
Location: Tucson AZ.
Posts: 18
radamx2 is starting off with a positive reputation.
I have 4.11 gears and a e4od and I have to much gear .gas milage falls off at anything faster than 65 mph.
I need to change gears in mine also.
Reply With Quote
  #5 (permalink)  
Old 09-18-2009, 11:31 AM
beetle beetle is online now
Senior User
 
Join Date: Nov 2000
Location: sunny san diego
Posts: 281
beetle is starting off with a positive reputation.
'85 460 w/ 3.55 & C6........best cruising rpm 2300 to 2500
Any higher and it feels like you need another gear. 2500 rpm is about 65 to 68 MPH.
Reply With Quote
  #6 (permalink)  
Old 09-18-2009, 02:57 PM
Bear 45/70's Avatar
Bear 45/70 Bear 45/70 is offline
Post Fiend
 
Join Date: Mar 2004
Location: Union, Washington
Posts: 6,056
Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.
Quote:
Originally Posted by bill11012 View Post
thanks, I think the ratio on OD is .71 to 1, same as a E4OD.
NEVER tow in OD. It stresses the engine as well as the rest of the drive train.

Best towing RPM is ALWAYS at peak torque.

That said my 1984 F250 with 460, C6 and 4.10s at 2800 rpm is right at 56 mph. Going slow is a major mileage improver. If I run over 60 mph I get 7.5 mpg or less. Slow down to 55 to 58 mph I get 9 to 10 mpg. Both of those numbers are with no camper, just the dually flatbed ATV trailer.

My 1999 Ranger with 4.0, ED and 3.55s tows best in 3rd gear and on hills in 2nd same trailer as above. Alone in O/D the truck gets 24 mpg highway.
__________________
Bear 45/70

"Earth has its boundaries, but human stupidity is limitless."
Gustave Flaubert (1821-1880)
Reply With Quote
  #7 (permalink)  
Old 09-18-2009, 06:51 PM
bill11012's Avatar
bill11012 bill11012 is offline
Modular motor junkie
 
Join Date: May 2009
Location: Texas
Posts: 6,190
bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.bill11012 has a great reputation on FTE.
why? I always tow in OD on flat ground.
If I have to give it more than 1/4 throttle, I down shift.
__________________
My V10 will out pull your PSD any day of the week,
If its close to stock and of the same age as my V10.

My IDI can't out pull anything.
Reply With Quote
  #8 (permalink)  
Old 09-18-2009, 07:26 PM
Bear 45/70's Avatar
Bear 45/70 Bear 45/70 is offline
Post Fiend
 
Join Date: Mar 2004
Location: Union, Washington
Posts: 6,056
Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.
Quote:
Originally Posted by bill11012 View Post
why? I always tow in OD on flat ground.
If I have to give it more than 1/4 throttle, I down shift.
Me too but the majority of guys towing out there aren't as smart as you either.
__________________
Bear 45/70

"Earth has its boundaries, but human stupidity is limitless."
Gustave Flaubert (1821-1880)
Reply With Quote
  #9 (permalink)  
Old 09-21-2009, 09:33 AM
Bern_F150_4x4's Avatar
Bern_F150_4x4 Bern_F150_4x4 is offline
Elder User
 
Join Date: Apr 2003
Location: Maryland
Posts: 672
Bern_F150_4x4 is gaining momentum as a positive member of FTE.
Adding a vacuum gauge in the cockpit would help people understand the load applied to the engine in OD.
__________________
-Bernie

'85 F150 4x4 300CID, NP435, 3.08's, Factory 15x8's, 31's, Lock-Right in the back
'86 F250 XL Supercab 4x4 HD, 460 4V, T19, D50/Sterling 10.25 LS 3.55's
Ford engines owned to date: 1.6L HO!,2.3L,200,240,300,289,302,302HO,351W,351C 4V,400,429,460
Reply With Quote
  #10 (permalink)  
Old 09-21-2009, 10:31 AM
ClydeSDale's Avatar
ClydeSDale ClydeSDale is offline
Elder User
 
Join Date: Apr 2003
Location: Minnesota
Posts: 834
ClydeSDale is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by Bern_F150_4x4 View Post
Adding a vacuum gauge in the cockpit would help people understand the load applied to the engine .....
TOTAL AGREEMENT! This could be called a 5-Star Statement. On the right side of Clyde's steering column is mounted a vacuum gauge, on the left side a tachometer (haven't gotten around to installing the in-dash unit I scored off a neighbors Bronco before it went to the junk yard).

In a nutshell; higher vacuum readings=more efficiency=better mileage. It is amazing how much difference a "lighter foot" can make and this little gauge can show you how. Cruise at a given speed and you'd be amazed how much vacuum you can increase and not lose speed. I've also added a micro switch and a cowl mounted indicator light to let me know when the secondaries start to open. Then I can decide if I want to back off or go for it.

Quote:
Originally Posted by Bear 45/70 View Post
That said my 1984 F250 with 460, C6 and 4.10s at 2800 rpm is right at 56 mph. Going slow is a major mileage improver. If I run over 60 mph I get 7.5 mpg or less. Slow down to 55 to 58 mph I get 9 to 10 mpg. Both of those numbers are with no camper, just the dually flatbed ATV trailer.
With basically the same setup that Bear is running; under normal wind conditions, watching my gauges and my speed averaging 57-60 mph, I can run 7.4-7.8 mpg TOWING my 10,000# "wind anchor" and I'm not a "flatlander". Using the vacuum gauge I go slower up hills trying to maintain 5-7" of vacuum and I go faster down hills taking advantage of gravity. I lose if I try to set a faster pace and we generally avoid freeways when we travel preferring the shorter route to the higher speed.
__________________
Roger


Clyde S Dale, Camper Pulling Workhorse
1984 F250HD XLT RCLB 4X2 8600 GVW 460 ^Timing C6 Track-loc 4.10's
Trailer Towing/Camper Pkg K&N in/DynoMax out All synth fluids, fully temp gauged
4-core HeatbusteR radiator, dual OE plate type tranny coolers 74,000 original miles (and counting)
ClydeSDale Photo Album
Reply With Quote
  #11 (permalink)  
Old 09-21-2009, 01:04 PM
beetle beetle is online now
Senior User
 
Join Date: Nov 2000
Location: sunny san diego
Posts: 281
beetle is starting off with a positive reputation.
In addition to adding a vacuum gauge, it is helpful to know what the power valve opening point is (6.5, 7.5, ect.) Keeping the vacuum level above the power valve opening point will help with MPG.
Reply With Quote
  #12 (permalink)  
Old 09-21-2009, 11:34 PM
ClydeSDale's Avatar
ClydeSDale ClydeSDale is offline
Elder User
 
Join Date: Apr 2003
Location: Minnesota
Posts: 834
ClydeSDale is gaining momentum as a positive member of FTE.
Talking

Quote:
Originally Posted by beetle View Post
In addition to adding a vacuum gauge, it is helpful to know what the power valve opening point is (6.5, 7.5, ect.) Keeping the vacuum level above the power valve opening point will help with MPG.


My "Carb Guy" reinstalled the OE 4180 dual stage power valve on my last rebuild. I need to ask him this!!! Thanks for the thought beetle!!
__________________
Roger


Clyde S Dale, Camper Pulling Workhorse
1984 F250HD XLT RCLB 4X2 8600 GVW 460 ^Timing C6 Track-loc 4.10's
Trailer Towing/Camper Pkg K&N in/DynoMax out All synth fluids, fully temp gauged
4-core HeatbusteR radiator, dual OE plate type tranny coolers 74,000 original miles (and counting)
ClydeSDale Photo Album
Reply With Quote
  #13 (permalink)  
Old 09-22-2009, 12:21 AM
Bear 45/70's Avatar
Bear 45/70 Bear 45/70 is offline
Post Fiend
 
Join Date: Mar 2004
Location: Union, Washington
Posts: 6,056
Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.
Quote:
Originally Posted by ClydeSDale View Post


My "Carb Guy" reinstalled the OE 4180 dual stage power valve on my last rebuild. I need to ask him this!!! Thanks for the thought beetle!!
I always run a dual stage power valve in my tow rigs. But I doubt very much it is the same value as the 4180, AKA an emissions carb and not a mileage or power carb and I removed it as some as it was feasible. I found a properly set up Holley 4160, LIST-1850, 600 CFM carb increased power and mileage by about 1 1/2 mpg.
__________________
Bear 45/70

"Earth has its boundaries, but human stupidity is limitless."
Gustave Flaubert (1821-1880)
Reply With Quote
  #14 (permalink)  
Old 09-22-2009, 12:44 AM
ClydeSDale's Avatar
ClydeSDale ClydeSDale is offline
Elder User
 
Join Date: Apr 2003
Location: Minnesota
Posts: 834
ClydeSDale is gaining momentum as a positive member of FTE.
Talking

Sounds good Bear, but if my "Carb Guy" Pat told me to cover the outside of my carb with chunky peanut butter I would likely have a messy engine that smelled REAL GOOD when it got warm.

Before the last rebuild we had a long discussion on replacing the OE carb with something else. Pat knows my truck, my truck usage and as far as I'm concerned damn near everything there is to know about carbs. IMHO (and many others too I might add) he is the premier carb person in Minnesota ... whatever that is worth in the international scheme of things ... and also my friend.

The 4160 may do well for you, but as I stated, I'm doing mid to upper 7's towing a 10,000# windanchor and I'm smilin'
__________________
Roger


Clyde S Dale, Camper Pulling Workhorse
1984 F250HD XLT RCLB 4X2 8600 GVW 460 ^Timing C6 Track-loc 4.10's
Trailer Towing/Camper Pkg K&N in/DynoMax out All synth fluids, fully temp gauged
4-core HeatbusteR radiator, dual OE plate type tranny coolers 74,000 original miles (and counting)
ClydeSDale Photo Album
Reply With Quote
  #15 (permalink)  
Old 09-22-2009, 02:26 AM
Bear 45/70's Avatar
Bear 45/70 Bear 45/70 is offline
Post Fiend
 
Join Date: Mar 2004
Location: Union, Washington
Posts: 6,056
Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.Bear 45/70 has a good reputation on FTE.
Quote:
Originally Posted by ClydeSDale View Post
Sounds good Bear, but if my "Carb Guy" Pat told me to cover the outside of my carb with chunky peanut butter I would likely have a messy engine that smelled REAL GOOD when it got warm.

Before the last rebuild we had a long discussion on replacing the OE carb with something else. Pat knows my truck, my truck usage and as far as I'm concerned damn near everything there is to know about carbs. IMHO (and many others too I might add) he is the premier carb person in Minnesota ... whatever that is worth in the international scheme of things ... and also my friend.

The 4160 may do well for you, but as I stated, I'm doing mid to upper 7's towing a 10,000# windanchor and I'm smilin'
The 4180 has several "BAD' traits, one of which is a too lean idle no matter what you tune it to. Number two is the backwards idle mixture adjustments. Another is the ported vacuum system works weird and I don't like how it advances the timing.
__________________
Bear 45/70

"Earth has its boundaries, but human stupidity is limitless."
Gustave Flaubert (1821-1880)
Reply With Quote
Old 09-22-2009, 02:26 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)

Tags
460, 74, buster, catalytic, converter, ford, heat, hills, idle, liter, loses, power, radiator, rpm, rpms, truck

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 06:58 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup