bypass valve for airbox

gbennett92b · Post by **gbennett92b** » Fri Oct 12, 2007 3:42 pm

We are building an RV8A, IO-360, and in the process of installing the airscoop on the bottom of the cowl, the airbox & filter. I am looking for a BYPASS VALVE to install on the top of the airbox to allow alternate air in the event of freezing or some other clogging of the air intake. Any help is much appreciated. Thanks, Gary B.

Brantel · Post by **Brantel** » Fri Oct 12, 2007 3:53 pm

A friend of mine used the regular carb heat stuff to make one.

captain_john · Post by **captain_john** » Fri Oct 19, 2007 5:50 am

Hey, I was just reading in 28 years of the RVator and it seems to me that Van sells just the parts you are looking for!

Scroll through the engine pages. I will see if I can find it too.

I seem to recall that they listed part numbers for the alternate air stuff!

Do you have a copy of the book?

CJ

gbennett92b · Post by **gbennett92b** » Fri Oct 19, 2007 7:07 am

Thanks for all the help. Checked Van's, no joy. We decided to make our own valve, a manually acivated door in the top of the airbox piano hinged at the bottom. Pulling the control knob will swing a rocker arm pushing the door down and open & pushing the knob in will pull it closed against the inside top of the airbox. Ram air inflight will then help to seal the door. Some folks have elected not to provide alternate air to the engine and that's ok. I think it is cheap and lightweight insurance but probably something we will never have to use, (kind of like the Halon fire extinguisher we plan to carry, or the airbags in my car, or the can of Mace in my wifes purse, or that miniature ID chip buried somewhere in my stupid dogs miniature neck.) Life is good.................