Re: 304/290/200R4 - now V8 Fuel Mileage

[farna@xxxxxxx]

Yeah, the thing would never pull that axle ratio in OD, and would probably put a strain on the engine in the lower gears. First gear total reduction is only 5:1 (4.96:1) instead of the more normal 7:1 for stick shifts. That's a big drop! Now gear it so that the final drive in OD is 2.22 (2.92 axle) and it MIGHT work well with a carefully built torque monster engine. That would give you a 6.5:1 total first gear reduction. Of course finding a 2.92 would be a chore -- 3.08 is the closest common gear I know of (6.87:1 first reduction -- close enough!). In a light car like a Hornet/Concord it would be a great combo and a nice little hot rod in traffic! Top end would be limited, but 60' times on a strip should be very good! 

On May 10, 2005 Tom Jennings wrote:

> I know this will seem like blashphemy to performance V8'ers, but
> since the six and the gen2/gen3 8's all weigh more or less the
> same, what about running a 360 massively detuned?
> 
> Think of it as a TORQUE MONSTER and not 360=big HP.
> 
> Move the torque peak as low as possible, period.  300cfm 2-bbl
> carb (or equiv FI), you could get away with single exhaust, etc.
> 
> Here's a little chart. I had one with my T150-OD trans. I plugged
> in a 2.22 axle. OD is obviously silly with this motor/axle.  Tire
> size is 205-70/R15.
> 
> Should be easy to tune a 360 for this! Pointy cam, no overlap.
> Smoooooth and quiet too!
> 
> But maybe the V8 with it's 33% more internal friction is a big ose
> for this, over a six. (8 pistons/valve jobbies vs. 6.) The low
> RPMs would help offset that though.
> 
> Run 50psi in the tires, 10-weight in the trans and axle...
> kidding.
> 
> 
> 
> TEST HACK                 ENGINE        1st     2nd     3rd     OD
>                          RPM     CFM     MPH     MPH     MPH     MPH
>                          1000    89      15.8    19.9    35.2    50.3
> Axle ratio n:1  2.22    1100    97      17.4    21.9    38.8    55.4
> Tire diameter   26.3    1200    106     19.0    23.9    42.3    60.4
>    3.78=9/37             1300    115     20.5    25.9    45.8    65.5
>    3.31=13/43            1400    124     22.1    27.9    49.3    70.5
>    3.54=11/39            1500    133     23.7    29.9    52.9    75.5
>                          1600    142     25.3    31.9    56.4    80.6
> RPM interval    100     1700    151     26.9    33.8    59.9    85.6
> T-150/OD                1800    159     28.4    35.8    63.4    90.6
> First           2.23    1900    168     30.0    37.8    67.0    95.7
> Second          1.77    2000    177     31.6    39.8    70.5    100.7
> Top             1       2100    186     33.2    41.8    74.0    105.7
> OD              0.7     2200    195     34.8    43.8    77.5    110.8
>                          2300    204     36.3    45.8    81.1    115.8
>                          2400    213     37.9    47.8    84.6    120.8
> Engine CID      360     2500    221     39.5    49.8    88.1    125.9
> VE              0.85    2600    230     41.1    51.8    91.6    130.9
>                          2700    239     42.7    53.8    95.2    135.9
>                          2800    248     44.3    55.8    98.7    141.0
>                          2900    257     45.8    57.7    102.2   146.0
> 
>                          3000    266     47.4    59.7    105.7   151.0
> 
> 
> 
> .


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