239 flathead compression?
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
239 flathead compression?
I am in the process of checking compression on my engine. The plugs are out and the accelerator is down. What number should I get? I can't seem to find It in my books.
Fleet Owner
Joined: Jul 2004
Posts: 27,291
Likes: 1,055
From: NM
The spec is hidden in the Spec section of the WSM, see below.
Anything over a hundred is good. The variance from highest to lowest is not good, tho. Is it possible the lower numbers are the last ones you checked, and the battery was just getting weaker as you went along?
Anything over a hundred is good. The variance from highest to lowest is not good, tho. Is it possible the lower numbers are the last ones you checked, and the battery was just getting weaker as you went along?
Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
At least that isn't the source of the trouble. I'm starting to wonder if 4psi just isn't enough fuel.
Fleet Owner
Joined: Jul 2004
Posts: 27,291
Likes: 1,055
From: NM
Trending Topics
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Fleet Owner
Joined: Jul 2004
Posts: 27,291
Likes: 1,055
From: NM
As I recall, you have a Bubba dizzy with mech advance only? Is the (-) terminal on the coil connected to the points/electronic ignition module? (+) should be battery voltage. Are you running points with a ballast resistor? Pertronics?
If your engine is essentially stock, the 4-barrel may just be too much carb for it, although I'd be surprised. An air/fuel meter would be a big help here. Try adding a couple degrees more advance.
If your engine is essentially stock, the 4-barrel may just be too much carb for it, although I'd be surprised. An air/fuel meter would be a big help here. Try adding a couple degrees more advance.
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
As I recall, you have a Bubba dizzy with mech advance only? Is the (-) terminal on the coil connected to the points/electronic ignition module? (+) should be battery voltage. Are you running points with a ballast resistor? Pertronics?
If your engine is essentially stock, the 4-barrel may just be too much carb for it, although I'd be surprised. An air/fuel meter would be a big help here. Try adding a couple degrees more advance.
If your engine is essentially stock, the 4-barrel may just be too much carb for it, although I'd be surprised. An air/fuel meter would be a big help here. Try adding a couple degrees more advance.
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
It appears there is a resistor (porcelain looking thing on the firewall). I have not checked the points or condenser since it was a new unit. I'm not even sure where the condenser is. There is no canister on the side. I'm assuming it is inside? Yes it is 12V
Fleet Owner
Joined: Jul 2004
Posts: 27,291
Likes: 1,055
From: NM
Can't hurt to take a look inside, I'd assume Bubba set the points and used a good condenser, but something could have good bad.
Back to the carb, does the accel pump squirt immediately when the throttle is moved, even a small amount?
PS is the PCV still disconnected?
Back to the carb, does the accel pump squirt immediately when the throttle is moved, even a small amount?
PS is the PCV still disconnected?
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
Yes pcv is disconnected
Thread Starter
|
Senior User
Joined: May 2013
Posts: 389
Likes: 0
From: Atlanta
To be clear the hose is out and both ends are capped
