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Old 07-27-2006, 03:34 PM
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RPMs and mileage

Hello. I have a stock 194 6 in a 3:36 geared Nova wagon. I have added a T5 tranny and found 4th (1:1) RPMs at 2900 at 65MPH. OD brings the RPMs to 2088 at 65MPH. I've found this to be too low and bad for mileage. Anything over 3000 RPMS also cuts into mileage. Lately I have been playing with different OD and rear gear ratios on a calculator and changing just the OD from a .72 to a .86 brings the RPMs to 2494 at 65. In addition I tried putting 60 series tires on and changing the rear gears to 3:55s getting 2813. Not much of a difference from the original 1:1 number. Do you think my engine can operate at or just under 2500 and not lose mileage or am I better off sticking closer to 2900 Thanks.

Strummin
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Old 07-27-2006, 03:40 PM
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uh hmmmm

sit down shut up and drive
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Old 07-27-2006, 03:54 PM
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This is a daily driven car so I think you can appreciate my concern.

Strummin

Last edited by strummin67; 07-27-2006 at 04:20 PM.
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Old 07-27-2006, 04:51 PM
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i try and gear for the peak torque at cruise..that seems to work about the best...I do suppose your engine is about at its peak torque at around 2900-3000..

Sam
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I have tried most all of it and now do what is known to work..
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Old 07-27-2006, 05:35 PM
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According to Nova Resource max torque for these engines was 177 ft lbs at 2400 RPMs.
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Old 07-27-2006, 06:17 PM
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What kind of mileage are you getting?
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Old 07-28-2006, 12:19 AM
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Based on what I got before the tranny swap 15 City 19 Hwy.

Strummin
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Old 07-28-2006, 05:38 AM
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I just wondered. I bought a Nova new in 67 , it was a 6 cyl. with automatic trans.....It got 18-20.
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Old 07-28-2006, 08:29 AM
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I'm probably alright where I am. I just think I can do better.

Strummin
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Old 07-28-2006, 10:55 AM
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Quote:
Originally Posted by strummin67

I'm probably alright where I am. I just think I can do better.

Strummin
Try and remove some of the lead from your right foot. Using less downward force would help too. LOL

Seriously, trying to get the "prefect" gear and tire combo can be a crap-shoot at best.

I like using a vacuum gauge. While cruzin', running with the highest vacuum readings usually gets the bestest mileage.
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Old 07-28-2006, 11:52 AM
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I do drive conservatively otherwise I would not be able to afford to drive the car every day like I do. I want to keep a 6 in the car because it's different. So would it make sense to keep my rebuilt 194 and play with the gears or go with a 250? Either way I'll be spending about $1800.

Strummin
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Old 07-28-2006, 12:07 PM
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The 67 that I had had a 250 6 cyl. in it. You need some more cubes...the 6 you got has to labor harder than a 250 would.
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Old 07-29-2006, 12:26 AM
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Hey everyone. Thanks for your advice so far.

Strummin
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