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Thread: my head swimming and confussed

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Dec 2007
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    holiday florida
    Posts
    26

    my head swimming and confussed

    first thanks to every one on here you all are good bunch of eggs . i understand that building a motor and what goes into it is almost a sceince with a whole lot of thought behind it . but for the first time in my 38 years i am completly lost .i have been around mechanics and motors my whole life .but i truely dont understand .what makes a bbc a stroker motor or what is a stroker motor ? are short connecting rods better than long ones ,are domes better than flat tops and cams do want a cam that opens really wide or what i dont mean to be askin alot of stupid stuff on here i just want to make a good decesions before spendin alot of money on my motor . and how does torqe factor into all of this ?do want awhole bunch of it or what ? thanks again rick

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Feb 2004
    Location
    san antonio, texas
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    1,233
    hey daddy, no problems, the stroke is on the crank, it can make the
    rod go further in the bore, hence shorter/longer rods, or shorter pistons,
    a 468 has the standard 4" stroke, a 496 has a 4.25" stroke pushing
    the piston further up the bore, and the rod size depends on the stroke,
    and piston size, and when selecting the cam, it is best to talk to a
    tech so he can give you the best cam to work with the rotating asembly.
    check your local hotrod shop for a package deal or check the internet
    i have dealt with www.competitionproducts.com and they are good
    guys to deal with, and i would call a cam guy to get a good cam,
    i dealt with www.claysmithcams.com, mr. horsepower, and
    www.lunatipower.com, there are many others to choose from.
    horsepower and torque complitment each other, w/o horsepower
    you get no torque, with no torque you don't get down the strip.
    but i have seen a motor have more torque than hswpr and torque
    launches the car, its like what came first, the chicken or the egg :wink:
    lunati makes a good crank up to 4.5" stroke forged for $825.00
    they also make their own pistons and rods, good luck daddy

  3. #3
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2005
    Location
    Rifle Colorado
    Posts
    585
    Dynos actually measure torque and horsepower is determined by calculation. using a formula with torque and rpm. You really want to be confused, horsepower and torque numbers are the same at 5252rpm......because of the formula used to calculate hp. Applies to all engines.

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Feb 2004
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    san antonio, texas
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    1,233
    yea, and what blew my mind is a motor on horsepower tv that had
    more torque than hswpr, for mountain climbing, also they recommend
    a crank be internaly balanced on a stroker instead of externaly,
    keep that in mind when purchasing a dampner, and thanx for the
    calculations john. :wink:

  5. #5
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
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    KIEFER, OK.
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    1,309

    Re: my head swimming and confussed

    [quote="rhiasdaddy"]first thanks to every one on here you all are good bunch of eggs . i understand that building a motor and what goes into it is almost a sceince with a whole lot of thought behind it . but for the first time in my 38 years i am completly lost .i have been around mechanics and motors my whole life .but i truely dont understand .what makes a bbc a stroker motor or what is a stroker motor ? Any motor that you install a longer stroke crankshaft than was originally in the block makes it a stroker motor.are short connecting rods better than long ones , There are many arguments about that, in a bracket motor use the one that fits in the combination you are working on the best.are domes better than flat tops The less dome to get in the way of the flame front and still give the desired compression the better and cams do want a cam that opens really wide or what Your cam will have to be matched to the RPM range and desired use of the engine, that will determine the lift and duration along with the lifter type. i dont mean to be askin alot of stupid stuff on here i just want to make a good decesions before spendin alot of money on my motor . and how does torqe factor into all of this ?do want awhole bunch of it or what ? thanks again rick



    Rick, just my 2 cents which is probably more than it is worth.

    Curtis[/b]

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    Feb 2004
    Location
    san antonio, texas
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    1,233
    yea the pistons with domes subtract from the chamber while the
    dish adds, if high compression is needed its best to get small chambers
    with least piston dome to get a high compression and if the
    chambers are too small the dish will help enlarge the chamber,
    all that stuff is interesting, long rods, short rods, with pins going
    thru the oil ring or a long piston for a short rod, interesting
    and then the cam with valves springs, man when you have the
    tools you can put some mean heads together, when sizing the
    cam, get recommened springs, its just hot rodding, good luck :wink:


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