advanced timing question

[gmctruck1976]

Hello guys, just seeing what the group has to say about advanced timing. Ive been reading your alls post trying to really get a feel for good tuning on banshees, I see alot of people run theres set at 4 deg advanced from the centerline in crank case.

I have also been reading up on this as well trying to really get into building. I would like to know how the pros do it. From what I have been reading it looks like I need to get a needle guage to find true top dead center. then adjust timing from there.

This is from bell grams book , What hes saying is like the higher i go with compression the less timing advance you need on these quads. Im getting ready to build a 4 mm stock rod stroker and ill tell ya from reading these books it looks like theres a lot of fine tuning that goes into makeing a good banshee into a bad ass one.

One last question When building this is the any thing special that i should check. Ive got cut domes so i wont be running a stroker plate in less i need to. im just alittle worried about squish. I have never dealt with o ring heads before and not having the little extra clearance up top. I can adjust that on the base gasket if im not mistaking. Im also wondering about port timeing on stock port jugs. I know Im going to have to get them ported some time But iI think I should be able to put it all together prior to that. Then just take the jugs off for porting once I make sure Ive got all the right clearences.

well guys does it look like i am headed in the right direction?

[locogato11283]

all you need is a timing plate. i think they run like 35 bucks.. adjust to +4..be happy. youll prolly need to run a little higher octane fuel as well.. you can mix some pump with some 110 and be fine.

 

as far as motor building.. i would let the pros do it. itll cost you a lot less money in the end and a lot less headache. i dont believe youre gonna learn everything you need to know from some book.

[deckheight]

Since the trigger plate is already indexed, just set it at whatever ignition advance you want. If you want to actually confirm your ignition timing then you will need to index your flywheel, determine TDC with a dial indicator/spark plug fixture, install some type of pointer at your newly indexed flywheel and check it w/a timing light.

Normally the way it works is... ASSUMING THE COMPRESSION RATIO IS CORRECT FOR WHATEVER OCTANE FUEL YOU ARE USING... Ignition timing needs to be advanced for higher octane fuels. Since higher octane fuels propogate a flame front at a slower speed, the higher the octane number the greater the ignition advance needed to realize maximum combustion chamber pressure at the correct degree of crankshaft rotation. I believe what A. Gram Bell was saying was in the context of increasing the C/R without increasing the fuel octane.

If you are not sure what your squish clearance actually is you need to assemble the motor and check it. It doesn't matter head gasket or no head gasket, the domes have been machined for the stroker crank and o-ring head... Right... The clearance is the clearance!

Get the port work done now since your gonna have to do it anyway... Jeeez, you just increased your stroke 4mm! It will run with out the porting, but not very efficiently, should be extremely responsive at lower rpm's however... LOL!