Estimated HP output - Build Sheet attached
#43
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Joined: Oct 2013
Posts: 2,888
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From: SF Bay Area
My flame arrestor flowed enough and it actually ran worse without it as it seemed to straiten and settle the air going in. What was eye opening was cracking the hatch and gaining some solid rpm. The afr didn’t change at all, but the engine was thirsty for better air and more of it.
#44
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Joined: Jul 2004
Posts: 11,332
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From: chicago
My flame arrestor flowed enough and it actually ran worse without it as it seemed to straiten and settle the air going in. What was eye opening was cracking the hatch and gaining some solid rpm. The afr didn’t change at all, but the engine was thirsty for better air and more of it.
#45
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Joined: Feb 2009
Posts: 8,356
Likes: 1,515
From: NW Michigan
Not to say that various boat manufactures are light on ventilation but then we increase the power by 30 to 50% and in some cases double from stock and then only compounds the problem. More vents in the right places the better. Rob the squirrel cage from your furnace and mount it under your rear seat and with a little rigging and converter... whalaa... lol, get that hot air out of there. I use to be know for leaving my blowers on intentionally!
#46
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Joined: May 2014
Posts: 206
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From: Buffalo NY
The flame arrestors are that bad?
Again, I didn't do the build, so I've got some work ahead of me. Am I better off running with the hatch open a little, or arrestors off? - both? Maybe just worm clamp a screen over them for trial?
Again, I didn't do the build, so I've got some work ahead of me. Am I better off running with the hatch open a little, or arrestors off? - both? Maybe just worm clamp a screen over them for trial?


