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If a big block Chevy on alcohol is tearing up flex plates and starters what do you do?
Wiki User
∙ 12y ago
ALCOHOL=HIGH COMPRESSION=STARTUP COUNTER-TORQUE
Something to consider is the engine startup counter-torque and the ignition system you're using. You may need a separate ignition switch and starter button. You leave the ignition switch off, spin the engine, and once it's up to speed, you hit the ignition switch. This will allow the starter to spin the engine without the counter-torque. High compression engines and Nitro-methane engines are especially succeptable to startup counter-torque. You may also be able to delay the engine timing until you start the engine, then return it to its' correct timing.
Starter is not disengaging properly..... maybe a bad bendix drive or your ignition switch return spring is weak or you have the wrong flex plate or starter.
The mesh between the pinion gear on the starter and flywheel needs to be checked. You can sometime pry out the starter drive into mesh with a screwdriver. Or you may have to remove the return spring located behind the solenoid, then reinstall the starter on the block. This allows you to pull out the drive to check mesh. The backlash between two of the teeth should be about .020-.030". Shims are available to adjust this. Just make sure the teeth don't clash.
Some aftermarket starters have mounting blocks that are mismachined and will never work right. Some ring gears have been found to be welded onto flexplates off-center. creating a wobble.
Use the remote Ford-type starter solenoid wired to a separate ignition switch. To make this work, the starter motors solenoid has to have a bypass link or wire added from the BAT terminal to the start terminal. This makes the starter hot and only needs power from the remote mounted Ford solenoid to engage.
Just check your timing, you should be able to retard the timing some and this will help. Also what compression ratio are you running in this?
Alcohol burns faster, and does not need the spark set so far ahead like gass does.
If one of the above doesn't fix it, check for a balance problem.. Both flex-plate and balancer. Did you check the run-out on the flex-plate as you accelerated the engine?
I have heard of cranks where the surface isn't square with the c/l on crank.
Wiki User
∙ 12y ago
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