Lotus Elan

control box check

PostPost by: dgym » Fri Dec 25, 2015 11:43 pm

In trying to track down an intermittent missfire problem, I'm checking the rb340 control box as per the manual.
It says to "run the generator ar 3000rpm"
by this do they mean the generator or the engine at 3000rpm? do i need to do some maths?

and,
can a misadjusted control box even cause a missfire? I'm wondering if it causing the coil to crap out.

merry xmas!
-Jim
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original owner B.M. Wetherill ..are you out there?
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PostPost by: oldchieft » Sat Dec 26, 2015 11:23 am

Sorry but why would you think generator control box from an engine misfire?

Jon the Chief
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PostPost by: Craven » Sat Dec 26, 2015 2:40 pm

Hi,
Never checked the pulley ratio but from memory they seem to be around the same size, so engine speed will be fine. Unlikely a fault in the battery charging system would cause a misfire.
You could eliminate any possible trouble by substituting the feed to the coil + with a separate source/battery, you will need an easy disconnect to stop the engine.
Ron.
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PostPost by: oldchieft » Sat Dec 26, 2015 3:34 pm

Or just run it with the D and F wire off the generator on the battery
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PostPost by: Jentwistle3 » Sat Dec 26, 2015 6:56 pm

>>Unlikely a fault in the battery charging system would cause a misfire.
Ron.<<<

A fault in the charging system will absolutely cause a misfire when the battery voltage dips too low as the battery slowly discharges. On a car with a mechanical fuel pump you can drive for some time with no generator if you don't use the lights and heat. Eventually the battery will run down and the ignition will fail.
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PostPost by: Craven » Sat Dec 26, 2015 7:41 pm

Jentwistle3
Comments made are relative to the post!
?In trying to track down an intermittent missfire problem?
Ron.
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PostPost by: dgym » Sat Dec 26, 2015 8:23 pm

thanks guys,

the reason for checking the control box is that it's the last item that was changed before the problem arose, which usually ends up being the problem.
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original rego PPC 8E
original owner B.M. Wetherill ..are you out there?
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PostPost by: dgym » Sat Dec 26, 2015 8:30 pm

when a condenser fails, is it intermittent or is it done for good when it's done? or does it overheat then come back to life like a coil can?
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original owner B.M. Wetherill ..are you out there?
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PostPost by: rgh0 » Sun Dec 27, 2015 3:03 am

Condensers can fail when hot leading to a miss fire and come back to be OK when they cool off.

cheers
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