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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Engine Starving for air? (https://www.offshoreonly.com/forums/general-q/339550-engine-starving-air.html)

TylerBurich 07-26-2016 01:54 PM
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

endeavour32 07-26-2016 01:59 PM
Tyler-
I have the very same set up as you. Dart single planes, with tall flame arrestors.

SB 07-26-2016 02:12 PM
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)

TylerBurich 07-26-2016 02:37 PM
Originally Posted by endeavour32 (Post 4463852)
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.

endeavour32 07-26-2016 02:54 PM
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?

TylerBurich 07-26-2016 03:14 PM
Mine are 454's .. spinning them 5200 now, would like to turn them a few hundred rpm higher.

endeavour32 07-26-2016 03:25 PM
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.

tomcat 07-27-2016 03:39 PM
Originally Posted by Faster7 (Post 4463572)
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.

ezstriper 07-28-2016 07:37 AM
Originally Posted by Tinkerer (Post 4463124)
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..

Tinkerer 07-28-2016 05:39 PM
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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