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View Full Version : Carb Jet Sizing


Stangman701
04-29-2007, 06:54 PM
What would be a good starting point for jet sizes on a 650 dp on a somewhat mild h/c/i 302?
speedracer
04-29-2007, 07:08 PM
What would be a good starting point for jet sizes on a 650 dp on a somewhat mild h/c/i 302?
It's been 10 years since I had a 85 Capri with the same combo but I think I had 64's in the front and 72's in the back.
383taman
04-29-2007, 08:53 PM
If the carb is new it will run with whats in it if not find out and start there. Then get it on a a/f meter and tune it from there.
coralcoupe1993
04-29-2007, 10:14 PM
How does the AF meater work on the carbs???
383taman
04-29-2007, 10:17 PM
With a wideband o2 same as a fi car.


How does the AF meater work on the carbs???
Stangman701
04-29-2007, 11:58 PM
If the carb is new it will run with whats in it if not find out and start there. Then get it on a a/f meter and tune it from there.

That's what I plan on doing. I have a dynojet wideband in my cobra that I'm gonna switch over to my 85 in a few weeks, I just was looking for a good starting point. I have an adjust a jet on the primary side. I think the carb came with 67's on the primary side so maybe I'll just start from there. I've got a bit of 87 in the tank that I need to burn out before I really start to tune on it anyways. I've only put about 10 miles on the car in the last three and a half years. I need to get it out on the road and just do a couple shake down drives before I really start to wrench on it.
Rodeheaver's
04-30-2007, 09:31 AM
the best way to tune a carb car with out a dyno is to make a pull up the street try and drift her back in the garage and pull a couple plugs and check em, then do a jet change, keep soing this until you have reached a desired jet size.... for hard street use i usually have to jet a little more rich than they come...