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RV4-List Digest: 1 Msgs - 01/24/06

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smokyray(at)yahoo.com
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Posted: Wed Jan 25, 2006 5:39 am Post subject: RV4-List Digest: 1 Msgs - 01/24/06

Steve, I didn't use the FAB on my RV4 as I built my own tunnel ram equipped with Ram air for normal flight and a K&N filter by-pass for ground operations. Hasn't let me down in 10 years. This allowed me to run the early stock cowl and scoop with a carb. My cowl was from pre-FAB days when the plans called for a setup similar to mine. In 95' the FAB came out and they enlarged the scoop to handle it, although the carb intake location isn't the same on all 320 sumps and the FAB won't work on every engine without some serious cutting. Van's sells the larger scoop you can attach to the cowl, I bought one and it is still sitting in my attic, never used.  Which injector throttle body are you going with? 

   

   I too like the looks of the 320 cowl and scoop and haven't changed it one bit...

   

  RR



RV4-List Digest Server <rv4-list-digest(at)matronics.com> wrote:

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Total Messages Posted Tue 01/24/06: 1

Today's Message Index:

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1. 10:12 AM - Re: [RV-4] O-360 cowl (Steve Sampson)



________________________________ Message 1 _____________________________________

Time: 10:12:16 AM PST US

From: "Steve Sampson" 

Subject: Re: [RV-4] O-360 cowl






Rob - I dont have a cowl yet so its just a question of ordering the right

thing first time. The logistics/cost of returning the wrong cowl from the UK

would be a nightmare!



I am certainly going with some form of -320, so its not a width issue,

though I presume VANS 320/360 cowls for a -4 are the same width? Its just

that they say if you decide on an injected 320 you need a 360 LOWER cowl in

order to get the injector body in as well as the 360 FAB which you have to

use because it is shallower (I think). As Randy L said the scoop is larger

and I have to say I am quite concerned about the look of the thing. I guess

I just need to find some 360 -4 to look at.....a bit scarcer here than

there.



Thanks, Steve.



Much as I would like a holy cowl there are two things against it.

a) I have been unable to get any definition of how it would work out with an

MT prop, and b) again the shipping costs make it fearsomly expensive. At

least the VANS cowls are consolidated with the rest of the finisk kit and

FWF bits.

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SSampson.SLN21(at)london.
Guest

Posted: Thu Jan 26, 2006 2:00 pm Post subject: RV4-List Digest: 1 Msgs - 01/24/06

Rob - I am totally unfamiliar with the set up you have.Never heard of K&N 

but I have never understood why we need to filter the air once airborne.



My plan was to go with the Silver Hawk injector, mostly because that is what 

everyone offered if FI. Reason for going FI was here in the UK carb ice is 

frequent and I presume the injected engine is smoother and more frugal on 

fuel. However the things stacking up the other way are:

- I really prefer the look of the O-320 cowl

- the air inlet is presumably matched to the engine

- VANS can supply the brackets for the carb but not FI and the O-320 FAB 

will fit

- there are not so many aircraft to copy how things are done near me. I have 

built a carb -9A before and feel more confident.

- there was also an interesting old post at Vans Airforce "Carb vs Fuel 

Injection" by Stein Bruch which go me thinking that perhaps the money is 

better in my pocket.



Feel free to tell me I am making a mistake if you feel strongly.



If I go back to a carb I guess I have to understand if I want a Marvel or 

someting else. Is there any other carb I should consider? If so what does it 

offer?



Cheers, Steve.



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