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Posted
Having the points set too far apart.

 

If you keep closing them up until it stops miss-firing then its not too far apart. This is just an easy wayto get a nice fat spark on a worked motor, like what anastasios has.

Posted (edited)

guys any idea on what head work should be done? and just to confirm that the 5k standard gasket should be ok with 4age pistons?

 

also

 

When does an engine bottom end come out of balance?

 

If the engine has been balanced am I able to balance the flywheel separately?

Edited by anastasios
Posted

Head work is more so a matter of how much do you want to spend!!! By the sounds of it you can got pretty hard on it because of the block its going on. Just the usual stuff like port and polish inlet ports, 4k etc exhaust ports are tiny so open them up a bit to, CC the head, bigger valves, 3+ angle valve grind etc etc. As for skimming it you really need to work out your CR and see weather its really required.

As for the gasket, whats the diametre of the 5k gasket vs the 4a pistons?

 

Engines don't really come out of balance, unless something like a harmonic balancer is playing silly buggers.

There's a couple of main areas of balancing motors. Firstly weight matching things like rods and piston, so there isn't say 1 piston that slightly heavier putting more load on one part of the crank. Then you've got balancing the rotating assemble. I plan on doing this when I finally get around to rebuilding another 5k I have. Going to balance everything from the gilmer drive pulley>crank>flywheel>pressure plate.

The thing you would want to watch out for is weather this engine has been balanced with a certain FW on it! Did you get one with the motor?

Posted

Most likely, plus it has to be bolted to the crank in exactly the same place (can go in 6x different positions) that it was balanced with the crank etc.

Posted

yupp, to do it properly you should get it machined as a rotating assembly.

you can, however, just get it machined and balanced and run with it. plenty of people have done it before.

but with this motor, I'm assuming your gonna wanna rev the ring out of it, so may not be the best idea to be tempting the balance....

talk to a shop about it, easier before you put everything back together :P

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