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Thread: engine placement in.....

  1. #1

    engine placement in.....

    ok heres the deal car is short wheelbase around 92 inches from center of axle to spindle center.. 4 link car very light weight all glass body and tubular fame work a arm car.. factory engine sat behind the front spindles by about 5 inches,, car is a 1974 tvr 2500 ... car had a small block blower motor in it before i got it and i have no ideal where is was set at.. i have a bbc blower motor.. my question is should i put the motor low in the chassis or high ???? i really dont want to run bars on the car but i know i prolly will have to what u guys think??theres no crossmember under the engine so i could set it on the ground thats how low i could go ...

  2. #2
    Senior Member EXPERT BUILDER
    Join Date
    Aug 2005
    Tell City, IN
    I believe the lower the better..

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Dec 2006
    that is a short wheel base. you will have a squirrel on your hands here.
    engine hight is lower is better., a crank hite of 10-101/2 inches is typical in full tube cars. This will give you 2 - 2 1/2 inch clearance with an 8" oil pan.
    If it is going to see any street duty at all, you will need to be higher.
    I would recomend a set of wheelie bars for the back.

  4. #4
    It is possible to calculate the necessary engine height. Of course, the result is only as good as the numbers you insert in the equation, but, having said that, the engine height (vertical distance from the ground to the engine's center of gravity) should be:

    [wx-fh(1-p)] / (fp)

    where "w" is the wheelbase, "x" is the percentage of the static weight on the front wheels divided by 100, "f" is the effective tire coefficient of friction (around 2.5 or slightly higher for a good slick), "h" is the height of the center of gravity of the car WITHOUT the engine, and "p" is the engine weight as a percentage of the total car weight divided by 100.

    Car weight includes driver. Engine weight is, of course, the weight of the engine/transmission package.

    This setup will leave zero weight on the front wheels on launch.

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