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Engine Starving for air?

Old 07-26-2016, 01:54 PM
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I am very interested about your findings when you start taking temps. I have single planes and tall arrestors that are very close to the underside of the hatch. I would imagine it gets very warm under there
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Old 07-26-2016, 01:59 PM
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Tyler-
I have the very same set up as you. Dart single planes, with tall flame arrestors.
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Old 07-26-2016, 02:12 PM
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That is better than closer to your engine.

Feel the intake plenum after a hard run. It will be cool. Win result of carburetors ! (vs MPI)
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Old 07-26-2016, 02:37 PM
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Originally Posted by endeavour32
Tyler-
I have the very same set up as you. Dart single planes, with tall flame arrestors.
Mine might be a tad higher with the TRS, seems like the engines sit abnormally high in the engine compartment. I'm sure whatever works for you will work for me as well.
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Old 07-26-2016, 02:54 PM
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I'm also ruining a 1 1/2" Wilson carb spacers. I'm close to the limit of how high you can be in our boats. What size are your engines and how many RPMs are you turning?
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Old 07-26-2016, 03:14 PM
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Mine are 454's .. spinning them 5200 now, would like to turn them a few hundred rpm higher.
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Old 07-26-2016, 03:25 PM
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I never noticed this problem with 454's. I spun mine to 5200 RPMs. I also think the 311 has an additional set of side vents compared to the 292.
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Old 07-27-2016, 03:39 PM
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Originally Posted by Faster7
I'd look at it a bit differently, as that 1140cfm of air the engine is bringing in is also removing some engine heat. Either way, to keep temperatures down would take a lot of air. !!
True that. Bring in 3633 CFM and the intake air temp will be ~ 110F in that example. Cold air intakes make sense and are common on supercat lites where the big 12" air duct entering the engine compartment is pointed right at the front mounted throttle body on the 525. I don't know why we don't see more of this on performance boats, except for the challenge of keeping water out of the duct.
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Old 07-28-2016, 07:37 AM
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Originally Posted by Tinkerer
EZSTRIPER - Those fans exhaust the engine compartment they don't suck air in except by causing a negative pressure inside the engine compartment. Even if you installed them to pull air into the engine compartment all they would do is restrict the flow because the engines draw a LOT more air than what those fans will pull in. The open hole with the fan removed would allow more air flow. What they need is more or bigger holes to let air in.
You may not realize that I am an air flow specialist.
I did not say it was a fix all, just one way to get some cool air into the engine room, every little bit helps..
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Old 07-28-2016, 05:39 PM
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My point is that at WOT and probably anything above and including cruise those fans are nothing but an obstruction to air flow. They are actually in the way of the airflow the engines are trying to suck in. Those fans work only at idle and low speed. IF the boat ( just about every stock boat out there doesn't have anywhere near enough) had enough air ducting then the fans wouldn't be an issue.
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