gas guzzler

F

Ford coupe

Senior Member
My freinds 47 Merc is very hard on fuel he tells me.Without knowing the MPG what could be done as it runs very nice and i have driven it and it starts runs and seems to work nice.I thought maybe a carb kit but sometimes if they are running good leave them alone..What would average MPG befor this car??Any Hints...??
 
Flathead Fords/Mercurys have never been know to get higher than usual gas milage. If the dwell, timing, and vacuum brake are adjusted well & the carb is clean & functional they should do OK on the highway maybe 16 to 18 MPG. Overdrive helps a bunch. For a 47 the Columbia rear axle would be the hot ticket to get the engine rpm down a little more. If it has a 4.11:1 rear axle or "mountain axle" then the milage will be worse due to the higher engine rpm at the same road speed. 3.78:1 is better but the Mercury may be a little heavy for a 3.54:1 rear axle ratio. Thats where the overdrive comes in. Best I ever got in my old 51 Mercury with overdrive is about 21 MPG but the average is around 19 on the highway. Not so good in town.

Kerby
 
Only DONT go with a #7.5 which are in all kits. Get your self a #5.5 with a correct gasket for it and you will be happy. ken ct.
 
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