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Who knows their Volvo motors? 5.7 questions.

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Old 04-04-2005, 02:44 PM
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Default Who knows their Volvo motors? 5.7 questions.

Just picked up another boat. It has a 1996 5.7 Gi in it. 250 hp with TBI. Does anyone know the internals of this engine? Forged or cast crank, pistons, etc? I see that same year they also made a GSi with 280 hp that had higher compression ratio. And the new GXi is 320 hp with MPI. Are these the same "base" motors or totally different bottom ends?

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Old 04-13-2005, 07:01 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

Nothing forged. They all have the same internals.
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Old 04-17-2005, 07:04 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

So all the 5.7 motors have the same internals? Even the new 300+ motors have cast internals?
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Old 04-17-2005, 07:46 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

The 5.0's, 5.7's and 8.1's yes.
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Old 04-17-2005, 07:53 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

Thanks. So, with cast internals, how well do the 5.7s hold up to supercharging at low(5 lbs) boost?
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Old 04-17-2005, 07:53 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

Quote:
Originally Posted by noboat
Thanks. So, with cast internals, how well do the 5.7s hold up to supercharging at low(5 lbs) boost?
It would be a cast disaster
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Old 04-17-2005, 07:57 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

I'm with JCPERF, probably not a good idea.
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Old 04-17-2005, 07:59 PM
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Default Re: Who knows their Volvo motors? 5.7 questions.

I'm confused a little. Aren't the Merc and Volvo 5.7s the same motors? Lots of people supercharge their Merc 350 mags. Just trying to clarify. Thanks for your help.
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