[juanbenae]

the set pictured above I reacquired from jerry woods after having run them on my spec car for a couple seasons and trading them to his shop for a set of 46mm PMOs that they tuned during dyno set up when I rebuilt the race motor. the one's pictured were set up and dyno tuned for an early stock 3.oL per class rules (stock CIS pistons, cams and running pump gas, although installing the higher compression euro pistons was allowed which I did when the motor was redone).


moving them to my current motor that I built with hotter cams and 9.5/1 pistons it was a challenge to get them set up right learning as I went. I did not have the money to dyno tune it and it took the better part of 3-4 months of weekend work/learning to get them sorted out. there were days I was crying in my hands as I could not get it to lean out with it running rich across both circuits. im better for having gone through it and it runs very good now with it remaining a bit rich on the idle circuit, but right where it should be up high at 12-13 AF ratio making great power.

I will be moving in the coming weeks from sea level to points 4000' and beyond and the crying into my hands very well may ensue again while trying to get them working up there. I took copious notes during the 1st set up effort and I will likely study them again to address the thinner air at altitude and what tweaks I will try to address what im experiencing.


pnutz will be the 1st to tell you carbs are not set it and forget it type of fuel delivery system so you will be best served by learning about them from the outset or the experience may not be a good one. as a regularly scheduled example I have to adjust the air fuel screws some as the season fuel blends change (see you're in a cal metro area like me) from summer to winter and visa-versa to compensate. although that has as much to do with air temps as fuel blends.


im no carb "master", although raw might suggest im a master baiter but learning what makes them tick is a must IMO. max is correct to some extent in referring to we carb guys as cavemen and we are for sure in the minority (im real good with that). if you follow along regularly in the 911 tech forum at all I suggest that there are far more problems brought to light with the 40 year old CIS systems per capita than our carbs. we have to be semi-masters of our own domain because true carb masters are getting harder & harder to find in todays indy shops and running a car to the shop every time a bit of crud gets lodged in an idle jet would become a pain.

now for what raw will call a forum bromance, if you have any questions PM me and id be honored to share what's left of my carb knowledge not expressed above...

t