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EFV-8 Club Forum / General Mercury Discussion / 1946 Mercury

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Posted By Discussion Topic: 1946 Mercury -- page: 1 2 3

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TomO
10-31-2012 @ 7:44 AM
Senior
Posts: 7245
Joined: Oct 2009
          
Lugging at lower speeds can due to idle speed adjustment.

The engine should idle at 450-500 rpm and have at least 18 inches of vacuum.

Some of the things that can affect the idle speed are: carburetor leaking gas or vacuum, timing of when the points open, point dwell, vacuum leak or poor compression.

Check your spark plugs for a nice tan color with no deposits as in the normal photo in the chart.

http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm

Check for vacuum leaks around the intake manifold and distributor housing vacuum connectio.

Tom

Peder D
11-10-2012 @ 3:01 PM
Member
Posts: 95
Joined: Oct 2009
          
Hi again! Have you had any success in dealing with lugging? What have you tried? Have a brand new engine and everything that goes with that...don't know what else to do? I do have a rubber hose in the line from the fuel pump, thinking about changing to a whole copper line...maybe help somewhat? Have checked and tighted down all nuts and screws...all else is good...what else...thanks...Peder

supereal
11-10-2012 @ 8:50 PM
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Posts: 6819
Joined: Oct 2009
          
The 3-54 is a "flat land " ratio. The better all around gearing is 3-78. That is why Ford supplied most cars with it. The flathead engines don't produce maximum torque until they get above 2,000 rpm. The low ratio prevents getting enough "grunt" to get off the line. Your new engine may improve when it gets some hours on it, but I wouldn't expect a whole lot. Hilly country called for a 4-11.

TomO
11-12-2012 @ 8:23 AM
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Posts: 7245
Joined: Oct 2009
          
Peder, do not use a copper line for gasoline. The fuel line from the tank to the firewall is steel with a copper coating on the inside and outside to protect the line from rusting. The line from the firewall to the fuel pump is a flexible line made of gasoline resistant rubber and the line from the fuel pump to the carburetor is a copper coated steel line like the one from the tank.

As to your lugging problem, is your idle speed correct?
Is your gasoline mixture right(check the plugs to determine this)?
Has your distributor been timed on a distributor machine? Has your vacuum brake been correctly adjusted?

Tom

supereal
11-12-2012 @ 2:02 PM
Senior
Posts: 6819
Joined: Oct 2009
          
Again, my friend Tom (my Mercury go-to), is correct. Many assume, since to correct fuel line looks like copper tubing, that it is. The proper tubing is, in fact, copper coated steel. Copper tubing will crack due to vibration., causing a fire hazard. Buy ikt pre-bent from a good vendor.

Peder D
11-27-2012 @ 12:24 PM
Member
Posts: 95
Joined: Oct 2009
          
Thanks to everyone for all the good advice. As far as the overdrive goes, are there any other well known overdrives that are offered for the early Ford V8's other than Mitch*ll in the United States?

Peder D
01-02-2013 @ 12:39 PM
Member
Posts: 95
Joined: Oct 2009
          
Still contemplating buying a Mitch*ll overdrive. Question: My Mercury has the 118" wheelbase...and the Ford 114"? Do they share the same "length" with regards to the torque tube? Just to be sure that I get the correct overdrive unit for my car...thanks...

TomO
01-04-2013 @ 8:37 AM
Senior
Posts: 7245
Joined: Oct 2009
          
Yes they share the same length torque tube. The extra 4 inches are from the cowl forward.

Tom

jal9846
01-09-2013 @ 12:01 PM
Member
Posts: 53
Joined: Oct 2009
          
Not sure when in the 46-48 model year cycle...but my understanding is that original OEM tire for that run of Mercury was 6.50-15. Unfortunately...that die was lost long ago, and the available options are now 6.70 and 7.10-15. I know my 48 convertible came with 6.50-15 wide white walls, as I still have an original off the car.

TomO
01-10-2013 @ 8:14 AM
Senior
Posts: 7245
Joined: Oct 2009
          
You are correct in the original standard tire size being 6.50x15. The 6.70 x 15 size was more readily available and used for replacement tires.

6.50x15 tires are still available for trucks and farm vehicles.

Tom

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