goloch
Senior Member
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Hi all. Now that I've returned from the black hole that is the end of April/beginning of May for a middle school band director (two concerts and two field trips with 200+ kids in two weeks) I have a chance to work on my 71 B again. Back in mid-April I managed to get everything through NJ inspection except for HC emissions (lowest reading was 1152, needs to be under 500). The air pump was removed by a PO so that's likely working against me but I'm stubborn and want to try to pass as is.
I found a few articles online that suggested increasing the clearances on the exhaust valves by as much as .010" to lower HC at the expense of increased NOx. NJ doesn't test for NOx so it seems like a viable solution. I already tried leaning the carbs and retarding the timing, but apparently went too far and had so many misfires I actually increased the HC to over 2200. I'm hoping that a more judicious leaning/retarding combined with the valves will do the trick. Just curious if anyone has attempted such a "fix" and with what kind of results. I still need to fully inspect the ELC vapor lines and I'm contemplating replacing the charcoal canister; do I just have no chance if that stuff isn't working right? The combination of nice weather and lack of inspection sticker is really starting to get on my nerves. The Subaru is nice and all; it just has too much roof for me when it's 70 degrees and sunny. /ubbthreads/images/graemlins/cool.gif
I found a few articles online that suggested increasing the clearances on the exhaust valves by as much as .010" to lower HC at the expense of increased NOx. NJ doesn't test for NOx so it seems like a viable solution. I already tried leaning the carbs and retarding the timing, but apparently went too far and had so many misfires I actually increased the HC to over 2200. I'm hoping that a more judicious leaning/retarding combined with the valves will do the trick. Just curious if anyone has attempted such a "fix" and with what kind of results. I still need to fully inspect the ELC vapor lines and I'm contemplating replacing the charcoal canister; do I just have no chance if that stuff isn't working right? The combination of nice weather and lack of inspection sticker is really starting to get on my nerves. The Subaru is nice and all; it just has too much roof for me when it's 70 degrees and sunny. /ubbthreads/images/graemlins/cool.gif