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do i need to balance my engine

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  • do i need to balance my engine

    i have a cast crank, cast piston 350 chevy. i am changing the stock rods to a set of scat i-beams. do i need to rebalance the engine or will it be fine? the engine probably wont make over 400 horsepower and i really dont want to spend the money if i dont have to

  • #2

    Re: do i need to balance my engine

    Re: do i need to balance my engine

    It's a good idea to balance an engine when you change parts (other than exact stock replacements).

    Although I can't imagine why you'd put those rods in that engine....

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    • #3

      Re: do i need to balance my engine

      Re: do i need to balance my engine

      Which scat I beams?

      There are the ones that look just like the stock rods but are made of better material (5140? steel) and there are the fully machined I beams that are the same as their H beams. The stock looking ones weigh just a touch more than the stockers (in the 580g range IIRC due to the denser material) and are usually ok without rebalancing with a stock weight or slightly lighter piston. They are meant to be a stock replacement.

      The fully machined I beams are quite a bit heaverier and will need rebalancing unless you use a lightweight wristpin on a stock weight piston. They are about 620g IIRC and you can loose 50g from a lightweight wristpin - which means no nitrous and the pins will be more expensive than your cast pistons by quite a bit. It would be cheaper to change the rods to stockers or the lighter stock replacement scats.

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      • #4

        Re: do i need to balance my engine

        Re: do i need to balance my engine

        In your case I would not say that it would be necessary. But if you are going to be drag racing it a lot it is always a good idea to have it balanced. It will help your engine live longer.

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        • #5

          Re: do i need to balance my engine

          Re: do i need to balance my engine

          money well spent, unless you weigh the rods big end and total and tey are the same
          2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
          First to run in the .90s .80s and .70's in SBN/A
          2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
          2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!

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          • #6

            Re: do i need to balance my engine

            Re: do i need to balance my engine



            money

            well

            spent


            Yup!

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            • #7

              Re: do i need to balance my engine

              Re: do i need to balance my engine

              It's a good idea to balance an engine when you change parts (other than exact stock replacements).

              Although I can't imagine why you'd put those rods in that engine....

              I totally agree; then you know the bottom end is good to go and can focus on the top end stuff.

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              • #8

                Re: do i need to balance my engine

                Re: do i need to balance my engine

                Figure the cost to balance it now compared to a rebuild in 12 months.
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                • #9

                  Re: do i need to balance my engine

                  Re: do i need to balance my engine

                  yeah, you guys are probably right

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