need alky help
#1
Junior Member
SHOW GUEST
Thread Starter
Join Date: Aug 2012
Posts: 6

We are running alky in a 548 ci BBC using a carb. Yesterday we made 1 time trial as we had problems on first time trial. On 2nd time trial around 3pm in high 80 degree weather car ran 8.92 in the 1/4. We went up for first round around 7. Car had exact same 60' but slowed up to 8.96. Does anyone know what would have made the car slow up as temps started to drop? Please only serious comments.
#2

Do you track the weather data? If the air got better and you are close to being on the edge of you fuel / air ratio, then you could have gone just a bit lean. Do you have O2 sensors? Just a quick guess on my part.
Curtis
Curtis
#3
Junior Member
SHOW GUEST
Thread Starter
Join Date: Aug 2012
Posts: 6

No o2 sensor. But I did have someone else tell me that they thought it was lean. Just wanted to keep some more opinions before we made a change. Normally we keep track of weather. We did the time trial but didn't for first round.
#10
Junior Member
SHOW GUEST
Thread Starter
Join Date: Aug 2012
Posts: 6

Changed jets from 172 to 180. and car still slowed up. temps didn't really change. And they glued the track between each run.
Time Trial 1- 1.2539 60ft; 5.6709 1/8 mile; 121.00 mph; 83°F; 42% humidity; 2:48 pm
Time Trial 2- 1.2602 60ft; 5.6783 1/8 mile; 120.59 mph; 84°F; 45% humidity; 4:00 pm
Elimination 1- 1.2709 60ft; 5.7118 1/8 mile; 119.98 mph; 84°F; 52% humidity; 5:13 pm
Elimination 2- 1.2691 60ft; 5.7259 1/8 mile; 119.67 mph; Don't have temps; 6:18 pm
Time Trial 1- 1.2539 60ft; 5.6709 1/8 mile; 121.00 mph; 83°F; 42% humidity; 2:48 pm
Time Trial 2- 1.2602 60ft; 5.6783 1/8 mile; 120.59 mph; 84°F; 45% humidity; 4:00 pm
Elimination 1- 1.2709 60ft; 5.7118 1/8 mile; 119.98 mph; 84°F; 52% humidity; 5:13 pm
Elimination 2- 1.2691 60ft; 5.7259 1/8 mile; 119.67 mph; Don't have temps; 6:18 pm