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Joined: Nov 2013
Posts: 4
Grease Monkey
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OP
Grease Monkey
Joined: Nov 2013
Posts: 4 |
We have a 1974 Chevy pickup. With a 350 engine, 4brl carb.
Points and Condencers last only about 1000 miles; the engine backfires.
After I install new points and condenser it runs fine for about 1000 miles....Then starts all over again.
The fella I got it from installed a dual battery set up for a camper, and a new alternator. Any suggestions? Thank you!
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Jan 2006
Posts: 418
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2006
Posts: 418 |
Sounds like you have a faulty resistor, since you are running a point setup. First, check that you do have a resistor, or a resistor wire, and if so, what the voltage is at the positive side of the hot coil. It should only be around 7 volts; if it is 12-14 with the car running, that is the problem. Also, are your old points showing signs of bluing or discoloration when you remove them? If so, definitely too much voltage coming through, another tell-tale sign.
Bob
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
In 1974 no resistor was used. Resistance wire was used. Sounds like the ignition is hooked-up to a constant 12 volt sorce. If 12 volts is found while engine is running add a resistor from a 1957 Chev.
You should end up with 12 V while starting and 7 volts when the key is in the run position.
Gene Schneider
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
You might also want to check the dwell when it is running bad and that would tell you that the points are closing, and the rubbing block wearing down. Are you using a lube on the point rubbing block?
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Jan 2007
Posts: 1,441
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Jan 2007
Posts: 1,441 |
Check the lobes on the distributor for wear,a neighbor had a 70 Pontiac that a couple were worn and the points would not stay gapped correctly.
VCCA #45194
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Joined: Nov 2013
Posts: 4
Grease Monkey
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OP
Grease Monkey
Joined: Nov 2013
Posts: 4 |
Thanks for your answer. Would installing HEI distributor solve the problem?
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Joined: Nov 2013
Posts: 4
Grease Monkey
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OP
Grease Monkey
Joined: Nov 2013
Posts: 4 |
Thank you for your help. Would installing a HEI distributor solve the problem?
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Joined: Nov 2013
Posts: 4
Grease Monkey
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OP
Grease Monkey
Joined: Nov 2013
Posts: 4 |
Thank you for your help. Would installing a HEI distributor solve the problem?
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Joined: Jan 2007
Posts: 1,441
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Jan 2007
Posts: 1,441 |
Yes it would help if the problem is in the distributor.
VCCA #45194
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
If you use an HEI do hot use the resistor wire from the coil to power the HEI, it needs full battery voltage.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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