James Cowl downdraft carb box install

[rockwoodrv9]

Originally Posted by DanH

I'm not talking about a cooling plenum. Follow the link Kyle posted for you. The large flat filter has far more media area than the little cone filter you're trying to use. Free power.

I understand about you were not talking about the plenum. I just don't believe I can fit a rectangular box in the space provided in the cowl inlet area. His article was very interesting in how he was able to get 10 more hp jus from that change.

I am all for me power and will look at the space again and pick up a kn filter that will fit. It could be a fun project to work on after I get flying. Now I just want to get done and in the air!

Thanks for the help.

[rockwoodrv9]

I may have a solution. I bought a plastic water bottle and did some cutting. I plan to make a mold like the photo and build a transition piece out of fiberglass and see if that works. I can get the cowl on and off as is, so I think it should work.
[IMG][/IMG]


I should be able to put my carb heat door in reasonable easy and it should give good heat at that point.

Can anyone see a problem with this plan?

[Rupester]

Nice solution! ...the highest and best use of a plastic water bottle!

[rockwoodrv9]

Terry, is is OK to have the hot air go in before the filter?

[Marc Bourget]

Hot air before the filter is optimum.

[rockwoodrv9]

Im still working on my James cowl with a downdraft carb and heat muff in front. I have been unable to make the James supplied air box so I am working with the Vans FAB. I have things clecoed together and unsure on a couple things.

[IMG][/IMG]

[IMG][/IMG]

The cowling - plenum - FAB has been difficult for me to get done. The glassing - I am fine with, but not understanding the whole baffling - engine cooling - carb air needs, has stumped me and caused me grief!!

Thanks.

[Beancounter]

I believe you are missing the carb heat box that needs to be grafted onto the air filter housing. PM me your email and I will send you pictures of my install.

[rockwoodrv9]

It is hard to see the transition piece from the SCAT tube to the FAB, but it is there. In the first picture you can see it clecoed to the FAB. I have not built the door - flap yet. Once I get everything figured out, I will put the door in.

My question is do I need to worry about how much air gets in through the front of the air box?

If I push the glass cover up to make it tight to the air filter, it makes the box very narrow.
I can make a ring to allow a deeper box if that is the way others have done it.
I have searched for pictures and haven't found any with the setup I have. I can't believe I am the first person to use a long James cowl with the heat muff up front on a carb engine.

Thanks for the help.

[ccrawford]

Sorry for my ignorance, I don't have an updraft Lyc, but what filter are you using in this FAB? It looks circular from your first photo above, but maybe it's not?

[Raymo]

IMHO, I would stick with the SJ setup you started with above but add his alternate air/carb heat option.

Also see pic on next to last page of this SJ instruction.