Posted By |
Discussion Topic:
missing can only get 40MPH
-- page:
1
2
|
|
flatfoot |
04-08-2021 @ 3:47 PM
|
|
|
Member
Posts: 267
Joined: Mar 2011
|
Recently overhauled motor, '37 flathead, can only get 40 mph top speed. Has non rebuilt carburetor, it's new. Changed new spark plugs. all cylinders 85-90 ft. lbs.. Points are set and very good distributor good, timing good. What's up?? I'm at a loss. Has 800 miles on new rebuilt engine. Carb is Stromberg 97. I'm in Redding, CA not a lot of early v-8ers here. Motor runs good at idle and starts right up quickly.
This message was edited by flatfoot on 4-8-21 @ 3:48 PM
|
MG |
04-08-2021 @ 6:09 PM
|
|
|
Senior
Posts: 1262
Joined: Nov 2009
|
Sounds like you're running on just 4 cylinders. If you can, replace the carb with a known working/functional one....
|
Mr Rogers |
04-08-2021 @ 8:28 PM
|
|
|
New Member
Posts: 106
Joined: Jul 2019
|
Are you getting a spark from all plugs at idle? Take a wire and touch plug to block. When engine is OFF, air cleaner OFF, pulling the peddle rod, is the carb spurting all jets? At 40 mph and you floor it, does it sound starving or missing? Is the choke fully open?
|
carcrazy |
04-08-2021 @ 8:44 PM
|
|
|
Senior
Posts: 1682
Joined: Oct 2009
|
Make sure you have spark to all 8 cylinders. If you do, and still have the same issues, suspect a fuel starvation problem.
|
mfirth |
04-09-2021 @ 4:54 AM
|
|
|
Member
Posts: 208
Joined: Nov 2017
|
If you have a flexible fuel line in the fuel delivery system, it could be collapsing on the inside. Not visable, it collapses under vac pressure. I once replace a pump to no avail & found that replacing that fuel line fixed the problem.
|
flatfoot |
04-09-2021 @ 2:27 PM
|
|
|
Member
Posts: 267
Joined: Mar 2011
|
It acts like its at top speed. Or that it has a governor on it.
|
carcrazy |
04-09-2021 @ 7:44 PM
|
|
|
Senior
Posts: 1682
Joined: Oct 2009
|
Does your car have the 60 HP engine?
|
sarahcecelia |
04-10-2021 @ 4:10 AM
|
|
|
Senior
Posts: 1194
Joined: Mar 2013
|
Carburetor isn't giving enough gas to go faster. Overhaul it or better yet; buy a new one from Carpenter Ford if they have one for that year car.
Regards, Steve Lee
|
40 Coupe |
04-10-2021 @ 5:50 AM
|
|
|
Senior
Posts: 1685
Joined: Oct 2009
|
Before going out and buying another Carb which should be a Stromberg 97 for the 85HP you have. Check out the fuel pump output plus the flexible hose from the metal fuel line to the fuel pump and the Carb float level. If there is any brakes in the metal fuel line to the gas tank make sure none of the patches leak and the old rubber fuel lines are replaced with modern line that can stand up to todays fuel.
|
carcrazy |
04-10-2021 @ 10:19 AM
|
|
|
Senior
Posts: 1682
Joined: Oct 2009
|
If the engine was just rebuilt, it may not have been assembled correctly. The cam timing may be wrong. To check for this, you can remove the front cover of the engine to verify that the crankshaft and camshaft are positioned correctly with each other. You can check this by rotating the engine until the timing mark dot on the crank gear is at the 12 o'clock position. If the timing is correct, the timing mark line on the cam gear will lineup with the dot. You may have to rotate the engine one crank revolution to TDC of the compression stroke to get the two marks to line up. If the two marks can't be made to line up by simply rotating the engine, you will have to remove the cam gear and rotate the camshaft until you can get it positioned properly for the two gears to lineup to ensure proper valve timing.
|