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How much less does the LS1 engine weight ?


SkiPablo

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Hi Guys,  buying a Sunsetter with LS1 - i was reading b/c it's aluminum head it is a lot lighter - does anything on the weights of the LS1 vs the Monsoon ?   I searched but didn't come up with anything.

thanks!

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I believe the EFI Indmar SBC-I's are all aluminum head/intake motors, so it is the difference in aluminum vs iron block & aluminum intake vs composite.  Figuring in the heat exchanger and additional fluid, my guess is 75lbs or less.  I highly doubt anyone has done a weight comparison on the marine versions of either.

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16 minutes ago, Nitrousbird said:

I believe the EFI Indmar SBC-I's are all aluminum head/intake motors, so it is the difference in aluminum vs iron block & aluminum intake vs composite.  Figuring in the heat exchanger and additional fluid, my guess is 75lbs or less.  I highly doubt anyone has done a weight comparison on the marine versions of either.

I'm pretty sure they are cast iron. If they were aluminum, then it would be ill-advised to run raw-water through them... From my understanding.

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7 minutes ago, boardjnky4 said:

I'm pretty sure they are cast iron. If they were aluminum, then it would be ill-advised to run raw-water through them... From my understanding.

IIRC, mixed-metal engines require closed cooling to prevent galvanic corrosion, but all-aluminum works fine with raw-water cooling unless you are running in salt.

https://www.westmarine.com/WestAdvisor/Preventing-Galvanic-Corrosion

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Lots of aluminum engines out there running open cooling without issue.....

As for the weight difference of the blocks, it isn't really much. An all aluminum sbc is about 100lbs less than an all iron SBC. That said, the other engine offerings in Bu's, at that time, had aluminum heads. With that being the case, the aluminum block is only saving about 50lbs or so.

Edited by TenTwentyOne
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