Hi all!
Before I begin, I want to let you know that yes - I had tried to search these boards as well as google, but keywords like "Drag" don't really bring up the correct articles lol...
SO... I've got this issue, started happening randomly, maybe sometime after I installed a 2400 stall, or rebuilt the top end. Now I don't have extensive knowledge of engine building, so I lay the trust on a mechanic, but he does fill me in on what he does.
The issue I experience is when driving highways, if I am accelerating, and reach, per se, 3000RPM, then let off the gas pedal, the RPMs drop to around 2800 and I feel the car getting pulled back - something I discovered is classified as "timing drag"? I am 100% sure this is not normal, since I've owned the car for over 10 years, and before, the RPM's would drop somewhere lower, and it would coast like it was in neutral - almost as if the engine disengages from the tranny (not sure what thats called).
We have tried to advance the timing on the vacuum advance, I remember at one point mechanic replaced the dist spring for a heavier one, ive got an MSD ignition box and coil, going to a 454 bored over with a comp cam 228 lift @ .50, 870 holley carb, 2400 stall, TH400 and fresh 3.42 out in the rear.
with all of this strangeness going on, ive also noticed shift points during cruising are off a bit (1 to 2 shifts at 2400 but only drops to 22) and etc. I would imagine there being a wider band between gears when switching.
would appreciate any help and advice - perhaps someone has dealt with this in the past? More than happy to answer any supporting questions.
Cheers guys!!!:banana:
Before I begin, I want to let you know that yes - I had tried to search these boards as well as google, but keywords like "Drag" don't really bring up the correct articles lol...
SO... I've got this issue, started happening randomly, maybe sometime after I installed a 2400 stall, or rebuilt the top end. Now I don't have extensive knowledge of engine building, so I lay the trust on a mechanic, but he does fill me in on what he does.
The issue I experience is when driving highways, if I am accelerating, and reach, per se, 3000RPM, then let off the gas pedal, the RPMs drop to around 2800 and I feel the car getting pulled back - something I discovered is classified as "timing drag"? I am 100% sure this is not normal, since I've owned the car for over 10 years, and before, the RPM's would drop somewhere lower, and it would coast like it was in neutral - almost as if the engine disengages from the tranny (not sure what thats called).
We have tried to advance the timing on the vacuum advance, I remember at one point mechanic replaced the dist spring for a heavier one, ive got an MSD ignition box and coil, going to a 454 bored over with a comp cam 228 lift @ .50, 870 holley carb, 2400 stall, TH400 and fresh 3.42 out in the rear.
with all of this strangeness going on, ive also noticed shift points during cruising are off a bit (1 to 2 shifts at 2400 but only drops to 22) and etc. I would imagine there being a wider band between gears when switching.
would appreciate any help and advice - perhaps someone has dealt with this in the past? More than happy to answer any supporting questions.
Cheers guys!!!:banana: