Eagle 4.25" crank?
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Adkoonerstrator
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From: Deep in the seedy underworld of Koonerville
Eagle 4.25" crank? I just noticed on Eagles website that they have a 4.25" stroke LS series crank available. It states that it is for tall deck blocks only and is to be used with their 6.560" rod.
My question is to any engine builders who have seen/used this crank already. Is there a specific physical reason it has to be used on a tall deck block and with the longer rods? I know on a stock LS block a stroke that long is not the best do to the short sleeves but, is there any reason it couldn't be run on a sleeved block or the LSX block with the longer sleeves and standard deck height?
I put this in here mainly because this forum seems to deal with some of the newer bigger bore/longer sleeve blocks.
My question is to any engine builders who have seen/used this crank already. Is there a specific physical reason it has to be used on a tall deck block and with the longer rods? I know on a stock LS block a stroke that long is not the best do to the short sleeves but, is there any reason it couldn't be run on a sleeved block or the LSX block with the longer sleeves and standard deck height?
I put this in here mainly because this forum seems to deal with some of the newer bigger bore/longer sleeve blocks.
Originally Posted by XLR8NSS
I just noticed on Eagles website that they have a 4.25" stroke LS series crank available. It states that it is for tall deck blocks only and is to be used with their 6.560" rod.
My question is to any engine builders who have seen/used this crank already. Is there a specific physical reason it has to be used on a tall deck block and with the longer rods? I know on a stock LS block a stroke that long is not the best do to the short sleeves but, is there any reason it couldn't be run on a sleeved block or the LSX block with the longer sleeves and standard deck height?
I put this in here mainly because this forum seems to deal with some of the newer bigger bore/longer sleeve blocks.
My question is to any engine builders who have seen/used this crank already. Is there a specific physical reason it has to be used on a tall deck block and with the longer rods? I know on a stock LS block a stroke that long is not the best do to the short sleeves but, is there any reason it couldn't be run on a sleeved block or the LSX block with the longer sleeves and standard deck height?
I put this in here mainly because this forum seems to deal with some of the newer bigger bore/longer sleeve blocks.
TECH Enthusiast
Joined: Jan 2004
Posts: 633
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From: Detroit,MI
Of course the physical problem as well that the counter weights are too tall for use with a 6.125" rod like most LS builds. The pin tower of the piston would crash against the counter weight preventing the engine to complete a revolution.
X2 on that reply.
It will never balance once you cut the pendulum down to clear that rod length until you do massive re-work (read expensive). The piston pin needs to be very narrow to get the reluctor wheel to spin also.
Kurt
It will never balance once you cut the pendulum down to clear that rod length until you do massive re-work (read expensive). The piston pin needs to be very narrow to get the reluctor wheel to spin also.
Kurt
Originally Posted by Uthinkso
Of course the physical problem as well that the counter weights are too tall for use with a 6.125" rod like most LS builds. The pin tower of the piston would crash against the counter weight preventing the engine to complete a revolution.
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I don't think the sleeves are long enough on the LSX, but the new "longer" Darton sleeves can accomodate that stroke. It's been done is a stock LS1 block, so there's no reason that it can't be done with the longer sleeves. It will require a few custom parts, but would make an awesome N/A motor when coupled with a 4.180" + bore.
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