Safe RPMs - Ford Truck Enthusiasts Forums

Safe RPMs

Thread Tools Search this Thread
Old 06-30-2010, 12:09 AM
dbdbb dbdbb is offline
Senior User
Thread Starter
Join Date: Feb 2009
Location: Marquette, MI.
Posts: 254
dbdbb is starting off with a positive reputation.
Safe RPMs

Hello all, I have a 46 1 1/2 ton dump with a stock flat head V8, I made some headers to replace the original manifolds that were rusted out and cracked. As far as I know that is the only modification. What I am wondering is what is a safe RPM to rev this engine to? I don't have a tach hooked up yet but this engine seems to be revving pretty high at 45 MPH.
I have ran it up to 55 MPH but the engine seems to be screaming but it seems to just keep revving the more gas I give it. So I was hoping some one could suggest a safe RPM limit? Thanks, Dan
Reply With Quote
Old 08-04-2010, 07:33 PM
kenjh's Avatar
kenjh kenjh is offline
Posting Guru
Join Date: Feb 2009
Location: victoria
Posts: 2,009
kenjh has a good reputation on FTE.kenjh has a good reputation on FTE.
In my corner if it sound's like it's overreving .. it probably is.. you can get a rpm gauge cheep and know for sure,, any idea what gearing you have?? my 54 has 5.13 gearing .. so it is screaming at 55 mph.. so I just don't go on the highway..
Reply With Quote
Old 08-17-2010, 09:16 AM
petey shoes petey shoes is offline
Posting Guru
Join Date: Mar 2008
Posts: 1,272
petey shoes is gaining momentum as a positive member of FTE.
at 55 you are screaming! does'nt mean you reached your limit. (but you ARE close) keep in mind these heavier trucks usually had a larger fan, which will scream at higher rpm,s
Reply With Quote
Old 12-06-2010, 10:28 AM
F6Guy F6Guy is offline
Elder User
Join Date: Feb 2006
Posts: 833
F6Guy is starting off with a positive reputation.
at 55 you are knocking on 3000 rpm. as long as you have good oil pressure and not running hot I would not consider it detrimental to the engine, just annoying. Depending on what I am pulling I can usually hit 50 mph in 4 high with the 8.11:5.83 rear axle. according to my tach that is 2600 rpm and I hold that for 30 miles at a time on some trips. If I am pulling one of my smaller tractors I run around 2800-3000 rpm. at 55 mph. I was able to pull a 56 ford 600 series tractor on a 25 ft lowboy gooseneck at 55 mph at 2000rpm in OD. of course in south LA we have no hills and it was not real windy. The wind is a killer on topend lol
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
revving jawdoc 1987 - 1996 F150 & Larger F-Series Trucks 1 09-03-2016 11:54 AM
Transmission Problem pumpkinsf150 1997 - 2003 F150 2 07-24-2016 11:04 AM
E4OD Torque Converter or Total Tranny Overhaul? Sbroom 1987 - 1996 F150 & Larger F-Series Trucks 17 11-16-2015 01:20 PM
P0341 and another question Macrosill 6.0L Power Stroke Diesel 1 05-26-2015 08:13 AM
94 f150 tranny FordRun 1987 - 1996 F150 & Larger F-Series Trucks 7 09-19-2014 08:04 PM

Go Back   Ford Truck Enthusiasts Forums > >

2800, 55, cylinder, drotec, escape, f150, flathead, ford, mph, rpm, rpms, safe, screaming, truck, trucks, v8

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 10:47 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.