66 Sat
Well-Known Member
I have a freshly rebuilt 318 Poly in a 66 Satellite. It's an auto (refreshed 727), and the motor has a performance cam, some port work on the heads, 4 barrel factory intake, 600 holley vac sec, and factory exhaust manifolds into a dual system. I've probably done about 1000 miles on it and have a concern with the acceleration as follows:
Off the line in D it hits pretty hard (for a 318), and in third on the freeway from say 3000 rpm it also pulls really well, but if I'm cruising at about 50 mph and drop it manually into second (where the revs are still at about 3000), the acceleration is quite tame, maybe only slightly better than when in third gear. It's almost like there is far more torque than power and the engine needs to have something to push against to do it's best (weight off the line and wind resistance at higher speeds). Is it possible that the secondaries aren't opening up and it's more noticeable in second?
Off the line in D it hits pretty hard (for a 318), and in third on the freeway from say 3000 rpm it also pulls really well, but if I'm cruising at about 50 mph and drop it manually into second (where the revs are still at about 3000), the acceleration is quite tame, maybe only slightly better than when in third gear. It's almost like there is far more torque than power and the engine needs to have something to push against to do it's best (weight off the line and wind resistance at higher speeds). Is it possible that the secondaries aren't opening up and it's more noticeable in second?