I'm still sorting out my Deuce coupe, it's coming along and progress is being made. BUT...'Scratching my head over why it's turning 3,000 revs at 70 when, according to calculations it should be turning 2100 - 2300 at that speed. Here's the set up and what I have done so far...any thoughts/suggestions are appreciated.
ZZ4 crate motor
700 R4 trans from Bow Tie Overdrives, their stage 2 street model, using a converter from Bow Tie OD's, the one they recommended for this tranny. Transmission shifts as it should through all four gears.
26.5 inch tall rear tires
3.50 gear
Stewart Warner electric tach which I believe to be correctly wired; stock HEI distributor
All the on line calculators say this combo should yield approx 2200 rpm at 70.
I have measured 70 mph by GPS and at that speed the tach shows 3000rpm.
The general consensus from others I've talked to about this is that for some reason it's not going into OD, but it sure shifts 4 times (confirmed by seat of the pants).
I have jacked the rear end up and rotated both rear wheels while counting the pinion yoke revolutions and this exercise confirmed the ratio is approx 3.50
I would like to get the revs down into the 2200 range as this car will be driven a lot over long distances and the increased mileage, not to mention less noise, would be a definite plus. Before tearing into the tranny, I'd appreciate any thoughts from you guys as to what's going on here and possible fixes. Thanks -Tom
ZZ4 crate motor
700 R4 trans from Bow Tie Overdrives, their stage 2 street model, using a converter from Bow Tie OD's, the one they recommended for this tranny. Transmission shifts as it should through all four gears.
26.5 inch tall rear tires
3.50 gear
Stewart Warner electric tach which I believe to be correctly wired; stock HEI distributor
All the on line calculators say this combo should yield approx 2200 rpm at 70.
I have measured 70 mph by GPS and at that speed the tach shows 3000rpm.
The general consensus from others I've talked to about this is that for some reason it's not going into OD, but it sure shifts 4 times (confirmed by seat of the pants).
I have jacked the rear end up and rotated both rear wheels while counting the pinion yoke revolutions and this exercise confirmed the ratio is approx 3.50
I would like to get the revs down into the 2200 range as this car will be driven a lot over long distances and the increased mileage, not to mention less noise, would be a definite plus. Before tearing into the tranny, I'd appreciate any thoughts from you guys as to what's going on here and possible fixes. Thanks -Tom