Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 09-20-2013, 08:46 AM   #1
drtung
Junior Member
 
drtung's Avatar
 
Join Date: Aug 2010
Location: Guelph Ontario Canada
Posts: 23
Default V8 lack of power

Having trouble with my 38 1/2 ton pick up.
24 stud flathead 8
Truck seems ( I don't know what is good for these engines) to run OK when cold & as it warms up gets sluggish to the point of almost no power.
I have a rebuilt distributor, timed with a Tasco timing device, new coil & new out of the box stromberg 97 carb.
Anyone have any insight as to what the issue might be & how to go about fixing it.
Thanks in advance
drtung is offline   Reply With Quote
Old 09-20-2013, 09:10 AM   #2
El Rat
Senior Member
 
Join Date: Nov 2010
Posts: 260
Default Re: V8 lack of power

Need more info. Start with a compression test and maybe add an electric fuel pump and a regulator. g
El Rat is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 09-20-2013, 11:52 AM   #3
ford3
Senior Member
 
Join Date: Oct 2012
Location: oroville calif.
Posts: 1,453
Default Re: V8 lack of power

ive seen motors with plugged mufflers act like that
ford3 is offline   Reply With Quote
Old 09-20-2013, 12:23 PM   #4
Bruce Lancaster
Senior Member
 
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
Default Re: V8 lack of power

Does it seem smooth in sluggish mode or is it missing?
Bruce Lancaster is offline   Reply With Quote
Old 09-20-2013, 01:58 PM   #5
adamsford40
Member
 
Join Date: Jul 2010
Posts: 46
Default Re: V8 lack of power

Try Skip Haney's coil, they don't break down when hot.
adamsford40 is offline   Reply With Quote
Old 09-20-2013, 07:19 PM   #6
drtung
Junior Member
 
drtung's Avatar
 
Join Date: Aug 2010
Location: Guelph Ontario Canada
Posts: 23
Default Re: V8 lack of power

just did compression check.Anywhere from 60 -77 PSI
In sluggish mode (second & third gear while driving) the truck seems to be missing.Sputtering and slight bacfire.Idles good all day long & revs up and down no problem.
While removing plugs to do compression check all appearead to be very sooty and all about the same amount if that means anything to help figure out the problem. Thanks for your input so far
drtung is offline   Reply With Quote
Old 09-21-2013, 03:37 AM   #7
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 5,741
Default Re: V8 lack of power

Do you think it may be running over rich?

If so, could be a few things.

Damaged power valve.
Float setting too high.
Float punctured and semi submerged.
Poor quality needle valve.
Too high fuel pressure.

All simple things to check.

I also had a faulty distributor cap that would make the car run worse the longer it ran. Maybe because as it warms up, compression improves and the load on the HT side of the ignition goes up and the spark tries to find an easier path to earth than firing at the plugs.

Mart.
Mart is offline   Reply With Quote
Old 09-21-2013, 05:28 AM   #8
Terry,OH
Senior Member
 
Terry,OH's Avatar
 
Join Date: May 2010
Posts: 3,256
Default Re: V8 lack of power

An out of the box distributor after sitting for many years most likely has stuck mechanical advance weights, the vacuum brake piston may also be stuck, with dry lubricant. The Tasco (static) will not find these problems. Suggest you send it to Bubba for a refreshing. The problems after warm up sound very much like a bad ignition condenser. If you send the coil condenser and distributor to Bubba he can check them all dynamically. It may be a good idea to check the float bowl of the new Stromberg for dirt.
Terry,OH is offline   Reply With Quote
Old 09-21-2013, 06:04 AM   #9
JM 35 Sedan
Senior Member
 
JM 35 Sedan's Avatar
 
Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 9,759
Default Re: V8 lack of power

Can you tell us a little about the "new" coil? I don't rely on any of my coils unless I know they have been rewound with modern high temperature insulated wire and other good insulating materials. I trust coils rewound by Skip Haney. The condenser has already been mentioned, but I would add that it should be checked at ambient and at elevated temperatures. Do you know how much pressure the fuel pump is delivering to the carburetor? Could be too high forcing carb to run rich. Is your new carburetor a Stromberg 97 made in England?
__________________
John

"Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein
JM 35 Sedan is offline   Reply With Quote
Old 09-21-2013, 08:18 AM   #10
drtung
Junior Member
 
drtung's Avatar
 
Join Date: Aug 2010
Location: Guelph Ontario Canada
Posts: 23
Default Re: V8 lack of power

How do you check the condensor?
The carb is brand new out of the box from Mac's auto. Not sure if it was made in England or not.
Weights on distributor were confirmed to be free before before setting up on the Tasco dial. The piston for the vacuum brake is also free.
I am not sure if vacuum brake is set up properly though.That could be my issue. Is there a procedure for setting that up?
As far as fuel delivery goes I just use the original pump working off the cam but have an electric pump hooked up as well just for priming as sometimes the truck sits for a while before I get time to drive.
The new coil is as well from Mac's. Tall type ford script 6 volt.Is there a way to confirm if it is faulty or not?
drtung is offline   Reply With Quote
Old 09-21-2013, 03:34 PM   #11
Terry,OH
Senior Member
 
Terry,OH's Avatar
 
Join Date: May 2010
Posts: 3,256
Default Re: V8 lack of power

On todays fuels there is very little use for the vacuum brake, so using your fingers, screw the adjustment out all the way, until it just starts to bind, then screw it in about 1 and 1/2 turn and lock it down with the nut.
You can check the condenser somewhat on a capacitor checker, should be about 25.MFD and check leakage at 200V. Then heat the capacitor until it is a bit too hot to the touch and check again with the checker, the values before heat should match after. NAPA sells a fairly good condenser FA49 for the 37-41 Ford.
Terry,OH is offline   Reply With Quote
Old 09-23-2013, 07:57 AM   #12
krackerjack1951
Senior Member
 
krackerjack1951's Avatar
 
Join Date: May 2010
Location: NC
Posts: 521
Default Re: V8 lack of power

soot under the valves is a common occurrence and reduces compression somewhat..a concoction of oil and kero drizzeled down the throat of carb and mid throttle..helps..however a little smokey....low compression.short trips compound,poor design is part of the problem..6.8 comp isnt high enough to burn off the poor fuel we cram in the engines as they get older as we do!
krackerjack1951 is offline   Reply With Quote
Old 09-23-2013, 03:35 PM   #13
OLD...BILL
Senior Member
 
OLD...BILL's Avatar
 
Join Date: May 2010
Location: Northern California,coast
Posts: 552
Default Re: V8 lack of power

Several places to look, carb, float to high, and what size jets, did the carb, come with ??? New out of the box, dose not count for much in today's world, sad to say. ie. week coil, not burning fuel?? as JM 35 wanted to say, get a coil built for today's fuel... Your comp. is a bit low, but not that bad, when you took the comp.test "was the throttle propped "wide open?? Take a look at the tail pipe, is it black soot also?? What spark plugs are you using ??... Take it for a run and run it up in second, when it's safe to do so take a look back and see if you leaving a trail of black smoke ?? sounds like to much fuel going through the engine and not burning.?? MMO.. Marvel Mystery Oil Pull all the plugs, some MMO in each cylinder, replace plugs, let set two three days, run engine, do comp. check again ?? Sorry this is so long, I'am looking at float level and new JUNK carb sorry to say. What is the original carb. doing, send it out for rebuild. ?? ... OLD.....BILL
OLD...BILL is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 05:18 AM.