Ignition timing help request

tom93r1 · 10-02-2014, 04:34 PM

First you need to determine what pulley you have on there. Different engines and different years had a few different timing marks so until you know for sure what marks are on your pulley you won't be able to time it correctly. And once you have that figured out, it probably doesn't matter if you time it according to GSL-se instructions or REPU instructions. Neither will be the same as your setup but both are a good starting point. Once you have it set to one of those two specs then you can fiddle with it until it feels right.

bowjangles · 10-03-2014, 04:26 AM

Thanks for your help TOM:

I will certainly do what you suggested, but don't have a clue how to determine what kind of a pulley I have on the 13-B.??
I do know that it only has two marks on it, and the '74 REPU manual sez to time the Leading at 0 degrees and the Trailing at 15 degrees. However,

The distributor on the car is from a '81-'85 RX7 and for that car, the manual calls for Leading at 5 degrees and Trailing at 20 degrees.
So, which settings do I use? Also, when I do decide which settings to use, this is done with vacuum hose disconnected at the distributor and plugged, correct?

Lastly, when you say "fiddle with it" does this mean just turn the distributor 'till engine runs it's best and forget about the numbers?

10-02-2014, 04:34 PM	#1
tom93r1 Rotary Fan in Training Join Date: Feb 2008 Posts: 45 Rep Power: 0	First you need to determine what pulley you have on there. Different engines and different years had a few different timing marks so until you know for sure what marks are on your pulley you won't be able to time it correctly. And once you have that figured out, it probably doesn't matter if you time it according to GSL-se instructions or REPU instructions. Neither will be the same as your setup but both are a good starting point. Once you have it set to one of those two specs then you can fiddle with it until it feels right. __________________ 74 REPU big port 13b Weber 48 DCO 93 RX7 R1 76 Suzuki RE5

10-03-2014, 04:26 AM	#2
bowjangles Rotary Fan in Training Join Date: Sep 2013 Posts: 62 Rep Power: 13	ignition timing help request Thanks for your help TOM: I will certainly do what you suggested, but don't have a clue how to determine what kind of a pulley I have on the 13-B.?? I do know that it only has two marks on it, and the '74 REPU manual sez to time the Leading at 0 degrees and the Trailing at 15 degrees. However, The distributor on the car is from a '81-'85 RX7 and for that car, the manual calls for Leading at 5 degrees and Trailing at 20 degrees. So, which settings do I use? Also, when I do decide which settings to use, this is done with vacuum hose disconnected at the distributor and plugged, correct? Lastly, when you say "fiddle with it" does this mean just turn the distributor 'till engine runs it's best and forget about the numbers?