Ok. A friend of mine is putting an Atkins supercharger on a ported 13B. He is forced to run 2nd gen pulleys, but he has a SE rotating assy. Are the keyways on the 1st gen 12A, 1st gen 13b, and 2nd gen 13b in the same place on the front of the eccentric shaft? His timing seems way retarded, even though it's on the mark on the pulley. We are considering getting a 1st gen 13B pulley and lining up the keyways and scribing new marks on the pulley. Any suggestions? My friend asked Atkins, but he said that they don't recommend following the marks on their pulley, and that they don't mark pulleys anymore. This car is ready to run... except for this, so any help is much appreciated.
Don.

 

When you say,"his timing seems way retarted, even though it's on the mark on the pulley" which mark are you talking about? Mazda has put out a number of different timing marks through out the years. The Gsl-se timing marks are as follow, yellow mark, 5 degrees ATDC, red mark 20 degrees ATDC. Make sure you dont have the wires coming out your coils to the distributor cap backwards. When you put the timing light on your leading 1 spark plug, @ idle it should be showing the yellow mark(5 degrees) and when you put your timing light on the trailing 1 spark plug it should be on the red mark(20 degrees). check this first and let me know...

 

Honorable Ito,
Actually my question was what is the relation of the keyway to the leading mark and does it differ from year to year. The pulleys that he is running are of a serpentine style and were in the kit provided by Atkins rotary. The timing has been set to the marks. I was just wondering if there could be a problem since he is having to run a main front pulley from a '88 on a SE rotating assy. If the keyways in the eccentric were cut differently then his timing would be off. We now believe that this is not the case. The reason we think that it's retarded is that his headers are giving off a nice glow. We are waiting on EGT and AFR gauges before we do anything else. I don't know if this glow is normal since this setup is new to all of us. I do however remember that our 13B PP made the headers glow a little at idle... but it also had a nice rough idle at 1750RPM. Brap Brap Brap... Any other input would be greatly appreciated.
Don.

 

Hi Don. Ok I understad your question, I just wanted to start with the basic timing and it's correction, sometimes that is the problem, timing is incorrect by having your wires interchanged(by mistake). The keyways are all cut the same on the eccentric shaft. The timing pulleys have different timing marks according to the year and application N/A turbo and so on. I have a question for you, your saying the headers are glowing, and that your using a GLS-SE engine with a 88 N/A timing pulley. I just thought of something. In the kit, is the 88 pulley a complete pulley? or just the outer metal wheel? because if it's just the seperated wheel of the complete pulley, when you installed the outer metal wheel on your gsl-se main pulley, maybe in the instalation it could be installed wrong and it's out of timing. this could be a possibility.. let me know..

 

The outer pulley from the kit is for a '88 main hub. That's why we have a '88 hub on the SE rotating assy. We had to use the '88 because the bolt pattern from SE to '88 is different. I'm thinking it might be a mixture problem as the carb is a Holley straight out of the box and hasn't been tuned at all. We're waiting on gauges before we drive it anyways.
Don.

 

keep me posted