mikebeezie3404

im trying to figure which carb i can get more hp out of and which one is easier to tune. Also jus wanted to see what everyone is running on there rx7's

j9fd3s

the big difference between the 2 carbs, is that the 48ida (all ida's) are downdrafts, and the dcoe's are sidedrafts. other than that they are bascially the same. the 48ida is a little bigger



mike

DJ Rotor

Tuning should be very similar. Most peak power will be from the 48ida. It's bigger and will use an intake with shorter runners, favoring high-end performance. The 45dcoe would use a longer runner manifold for better low-end. Also would give you better intake charge velocity through the carb (just because of being smaller) so would, again, be better for low-end performance. Should still go pretty good on top though. All depends on what you want.



A. Graham Bell's "Four-Stroke Performance Tuning" has a very detailed chapter on tuning Webers, you should check it out.



J