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Old 07-15-2016 | 06:06 PM
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Originally Posted by class6
Ever try to breathe with your head in a box
Yeah, but I'm not sure how cunnilingus relates to this whole engine venting issue.....
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Old 07-15-2016 | 07:08 PM
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Originally Posted by CNC
To the best of my knowledge you cannot develop over atmospheric pressure (14.7 psi) without a blower or compressor..

Randy
yes you can Yamaha my r1 had what they called ram air picked up hp over 140mph i think.
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Old 07-15-2016 | 08:22 PM
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Originally Posted by Speedracer29
Yeah, but I'm not sure how cunnilingus relates to this whole engine venting issue.....
LOL !!!!!!!!!

Same rules apply, I learned along time ago to use scuba gear when going diving ! Hah !
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Old 07-15-2016 | 08:52 PM
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Pretty much as air is drawn or forced into the intake, the vents into the bilge will allow the air to be drawn into the engine compartment. You just need to make sure that the vents into the bilge are large enough to feed the engines. The more HP, the more air that is needed. How do you know the right size?....that is above my pay grade 😳
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Old 07-16-2016 | 07:11 AM
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Originally Posted by CNC
To the best of my knowledge you cannot develop over atmospheric pressure (14.7 psi) without a blower or compressor..

Randy

I agree very hard to go positive
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Old 07-16-2016 | 07:15 AM
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Originally Posted by dockrocker
I had always heard (grain of salt time) that if you run the engine up to max rpm, then crack the hatch an inch or two. If you get a few more rpms, you likely need better venting. Don't know how true that is but it sounded reasonable at the time.
Took the air filter off my old Nordic with a 496HO and raised the hatch...no difference.
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Old 07-16-2016 | 07:59 AM
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having enough air to run is nice. having enough airflow through the bilge to keep gas fumes from accumulating to an explosive mix is much nicer. they put those cute little fins on vents one side facing forward, one side aft. I don't know if that works or not. if they are where airflow causes low pressure not much will get in. bigger sportfish sometimes have engine air intakes going straight to the side vents so they get air that hasn't been pre-heated by the engines and exhausts. even the hottest day the ambient air is cooler than your engine compartment.
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Old 07-16-2016 | 08:08 AM
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For visuals to make it easier

502cid x 5000rpm = 1,255,000 cubic inches (726 cubic feet) of air per minute
2 x 502cid's x 5,000rpm = 2,510,000 cubic inches (1452 cubic feet) of air per minute

The following is the size of 1000cuft

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Old 07-16-2016 | 08:18 AM
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Post 11 is killing me. he must have watched Dr. Ruth way back in the day for all that proper terminology lingo
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Old 07-16-2016 | 08:57 AM
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Originally Posted by SB
For visuals to make it easier

502cid x 5000rpm = 1,255,000 cubic inches (726 cubic feet) of air per minute
2 x 502cid's x 5,000rpm = 2,510,000 cubic inches (1452 cubic feet) of air per minute

The following is the size of 1000cuft

Wouldn't that be assuming 100% volume metric efficiency?

I do know when we were testing the engine room was about 20-25 degrees warmer then outside.
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