Quote:
Originally Posted by RCCob  Hi Pete, thanks for the reply and yes it is RV8 3.5. I don't have dissy off but I did have it to bits, that when I noticed the spring on the weights at the moment we have a silver on and a loose fitting gun metal one. dose this would mean I get full advance at about 3500-rpm? How did you mod your dissy to get the extra advance needed?
Regards Russ |
Hi Russ,
Even though your springs are the same colours that I described I doubt very much that they are from the Real Steel kit. Infact the Real Steel springs do not go slack even when the dizzy is in its rest position. (Unless they've been stretched?). For 10 quid I'd just get a kit then you can be pretty sure that your dizzy is advancing at the same as mine.
You may not need to increase the advance, you may need to decrease it, this is why you need to measure how much advance it is giving you. There is a number stamped on the advance mechanism but I'd still check it with a protractor. Taking the dizzy off is not a big deal, you just need to make a note of where the rotor arm is pointing AND mark the dizzy housing against the timing over (Make the mark where the dizzy body goes into the timing cover). You might need to knock up a tool to move the oil pump drive to aid refitting the dizzy. A piece of steel tube worked into a rectangular hole works fine.
If the total advance needs restricting this can be done by making thin sleeves out of brass or steel tube that slide over the spring peg that acts as the stopper. If more advance is required you can use a dremel to grind the part of the mechanism that hits the peg. To do this you will need to knock out the roll pin that attaches the drive gear at the bottom of the dizzy. When refitting this gear try test fitting it on the shaft both ways as you will find that the holes for the pin line up better one way then the other way. If you don't do this and just hammer the pin back in you can crack the gear. (I did this and had to by a new one!).
The dizzy does need to come off the engine to do this work so some people might not bother! If you want the best out of your engine you have to put the effort in! The timing always needs resetting after taking the dizzy off no matter how well you line the marks up, I always find that it is a couple of degrees off!
Pete