Intake design for stock appearing class and needed a winter project
Got it running for 1/2 a second and because I’m a moron and it was 19 degrees in the garage the rtv didn’t set over night so it started to pee out of the front corner. Pulled it off and put a heater in the garage. Second time was a charm. So shockingly enough, at least to me it idles and starts exactly like the old intake. Idles at the same AFR. Doesn’t smoke. So the carb had .116 front with a 6842 rod and .107 sec jet. Took it for a drive and running around on the primaries it was fine. Maybe a slight tip in slowness. Not really a bog, just a bit slower to respond. Give it the beans and it go holy crap lean. Ok, I had an idea that I would need to slow the air door done a bit from watching the carb on a dyno with another motor. I put a full turn tighter in the air door. Which brought the sec opening AFR down to 14.7 under WOT. Removed a bunch of the Edel bog. So then went from .107 jet to .119 in the sec. got it down to 13.7, then change front jet from .116 to .119 which got me to 13.3 ish. Finally did something I would think was crazy before sat, I left the sec jets on the bench. I also inserted a copper strand into the sec main emulsion air bleed. Which on sunday got me 12.9-13.0. It seems to pull a bit lazier through middle rpm, not a great surprise. It seems to pull harder over 6,000 rpm. Normally it needing all that jet tells me vacuum leak, but it responds to idle mixture screws and it doesn’t smoke. Idle also doesn’t change when I spritz the flange area with water. I feel comfortable running it at a tnt. The plugs are ok, no scary signs like aluminum. 2,6,8 look identical , number 4 rich.
Got it running for 1/2 a second and because I’m a moron and it was 19 degrees in the garage the rtv didn’t set over night so it started to pee out of the front corner. Pulled it off and put a heater in the garage. Second time was a charm. So shockingly enough, at least to me it idles and starts exactly like the old intake. Idles at the same AFR. Doesn’t smoke. So the carb had .116 front with a 6842 rod and .107 sec jet. Took it for a drive and running around on the primaries it was fine. Maybe a slight tip in slowness. Not really a bog, just a bit slower to respond. Give it the beans and it go holy crap lean. Ok, I had an idea that I would need to slow the air door done a bit from watching the carb on a dyno with another motor. I put a full turn tighter in the air door. Which brought the sec opening AFR down to 14.7 under WOT. Removed a bunch of the Edel bog. So then went from .107 jet to .119 in the sec. got it down to 13.7, then change front jet from .116 to .119 which got me to 13.3 ish. Finally did something I would think was crazy before sat, I left the sec jets on the bench. I also inserted a copper strand into the sec main emulsion air bleed. Which on sunday got me 12.9-13.0. It seems to pull a bit lazier through middle rpm, not a great surprise. It seems to pull harder over 6,000 rpm. Normally it needing all that jet tells me vacuum leak, but it responds to idle mixture screws and it doesn’t smoke. Idle also doesn’t change when I spritz the flange area with water. I feel comfortable running it at a tnt. The plugs are ok, no scary signs like aluminum. 2,6,8 look identical , number 4 rich.
