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Old 12-11-2008, 05:32 PM
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Default How fast

A buddy of mine has a 29 velocity with a 496 it is a 08 boat.It gps top speed is 67 mph.How fast do you think it will run if he puts a supercharger on it.He is going to put it on the stock motor which is like 425 hp
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Old 12-11-2008, 05:44 PM
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How much boost ??
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Old 12-11-2008, 05:53 PM
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6 to 8 pounds
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Old 12-11-2008, 06:02 PM
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with no intercoolers
6# 74-76
8# 78-80
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Old 12-12-2008, 05:49 PM
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Originally Posted by HotPursuit View Post
with no intercoolers
6# 74-76
8# 78-80
How fast with intercoolers?
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Old 12-12-2008, 06:03 PM
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ever degree dropped in intake air should be worth 1HP or about a 10% gain. The blower takes power to turn so its kind of a trade off. You could increase boost with the intercooler safely. Speed gain would depend on changes made to overdrive and timing.
Im thinking a extra 2-4 mph depending on which changes were made.
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Old 12-12-2008, 06:53 PM
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You can't put 6-8 #'s of boost to a 496. The pistons won't last.
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Old 12-12-2008, 07:09 PM
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I thought the 425 h.p. 496 (mag) had forged internals and 375 h.p. did not???
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Old 12-12-2008, 11:27 PM
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He didn't ask if the engines would last.
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Old 12-12-2008, 11:58 PM
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Originally Posted by 007joe View Post
I thought the 425 h.p. 496 (mag) had forged internals and 375 h.p. did not???
Negative. Further, you can bash me now for saying so but I guarantee you that if you puff a 496 you will live to regret it... That engine is not made for it. The pistons are very brittle on both, the 375& 425 models.

Also, you need to know if you have a steel crank or cast. If I remeber, they started with steel; went to cast; back to steel on some serial number range; and then went back to cast. It's a great, reliable engine but she don't like blowers for too long...

In all sincerity, I do wish you luck and I'd like to hear that you came back 2 seasons later and had no issues worth mentioning after running a blower on this motor.

take care,
jason

Last edited by SDFever; 12-13-2008 at 12:06 AM.
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