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Old 05-10-2008, 02:41 PM
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66 Mustang I6 HELP

I have a 66 Mustang coupe with the Ford 200ci I6.. It is all stock (for now), but i wanted to know the stock compression ratio and rear gear ratio for this car and engine.

Thanks in advance to anyone who can help

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Old 05-17-2008, 04:17 AM
 
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Hey man hope you're still around to read this reply. Can't help with the CR but regarding the rear diff ratios, if you have a 3 or 4 speed then the ratio is 3.2 to 1. If you have an auto then the std is 2.83 with the option of a 3.2
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Old 05-17-2008, 07:58 AM
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9.2:1 factory compression ratio. the rear end is a 71/4" rear end. it all depends on the car with a 6cyl as to what rear gear it has. 3.50's were very common in the 6cyls w/ manuals. but to make sure of what you got look at the axle code on the door tag, mustang door tag decoders are all over the internet however, for finding the axle code, a Falcon decoder will also work
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Old 05-18-2008, 01:40 AM
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Here's how I do it for an open-type differential.
Jack up one wheel off the ground and place a sturdy jackstand on the axle tube close to the spring. Make a chalk mark on the tire at the tread and on the ground next to the tire mark. Mark a chalk mark on the driveshaft and rig up a piece of clothes hanger wire nailed to a piece of 2x4 so that the end of the wire points directly at the chalk mark. Have a buddy watch the driveshaft while you turn the tire. Have him stop you when he has counted 10 revolutions of the driveshaft. The number of times you have rotated the tire will be the ring and pinion ratio. If the tire turned about 3 1/2 times, the ratio is 3.50:1. If it turned about 3 1/4 times, it's 3.25:1. 3 turns would be 3.00:1. 2 3/4 turns would be 2.75:1 and so forth. You can interpolate odd turns by thinking about the tire as a clock face. Each 6 minutes would be 1/10th of a ratio point. In other words, if the tire turned 3 full turns and another 12 minutes, it would be a 3.20 ratio.
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