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Old 04-05-2004, 06:57 PM
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Has anyone used the Hardin Marine Cyclone exhaust? I need a new system and want larger primaries. They say Hardin's have 2 1/8" primaries. CMI would be great except for the cost. Any info or suggestions for hardins or other options?
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Old 04-05-2004, 09:07 PM
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Their system does not seem to be anything new. Why do you mention it? Do you have experience with it?
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Old 04-06-2004, 08:50 AM
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Thanks for the info. Looks like this is not for me. Expensive mistake.
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Old 04-06-2004, 09:23 AM
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Have you considered Lightning?
They worked very well on my previous boat.
Affordable too.
Attached Thumbnails new headers-donzi-01040.jpg  
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Old 04-06-2004, 09:40 AM
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I am considering lightning. But to the best of my knowledge they only have 1 7/8" primaries. Kind of small for a big blower motor. I may go with them anyway. Has anyone used them to make 1000HP?
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Old 04-06-2004, 09:45 AM
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I'm pretty sure they can make up 2 1/4" inner tubes for you.

Give them a call and talk to Jan.


PS. My headers on the pic above have 2" inner primaries and 4" inner collector.

Last edited by 38KV; 04-06-2004 at 05:09 PM.
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Old 04-06-2004, 06:52 PM
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I spoke to Jay. He said the new header has 2 1/8" primarys. Cost about 4K, I may go with them.

Thanks
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Old 04-06-2004, 08:17 PM
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I was looking at blown42's motors today, he has Lightnings with 5# boost pulleys. I didn't tape the primaries, I guess they're 1 7/8ths.

This made me think, and yes it hurt .

I wonder what the formula is to calculate how much exhaust gas expelled(of course considering exhaust gas temp expansion) vs. actual cfm at the carb.

Anyone? Bueller?
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