The Terrifying Tale of FrankenSnorkel !

[scrollF4]

Originally Posted by grubbat

Why don't you make a large NACA opening like the Mooney and go straight in to the servo?

Because I really like the appearance of the RV-7a nose with no intakes under the spinner. I'm sticking with the snorkel-to-left intake approach. The jury's still out on whether I'll replace FrankenSnorkel.

[DanH]

Originally Posted by SHIPCHIEF

I'm trying pieces from a Spectre universal remote air filter.....
It has a cone shaped K&N filter inside.

Scott,
No point in re-inventing the wheel. Sounds like a 4" dia base x 5" long cone filter. If so, it doesn't provide nearly enough media area to avoid a significant pressure drop. Don Rivera was kind enough to measure a similar filter for me, a K&N RU3120 with the outlet spigot removed. The test assumed 1400 PPH for the 390. Your demand would be a little less, but probably not enough less for a good result. Restriction gets worse when dirty.

The canister was 6" diameter, but otherwise is about what you're trying. Sorry.

[PIN 37]

Has anybody put a snorkel on an Airflow performance throttle body and if so, how did you do it ?

[wjb]

Originally Posted by scrollF4

This is the stock RV-7 cowl for an IO-360M1B 180hp horizontal induction setup, and the FAB came with the firewall forward kit. The engine is a factory-new stock Lycoming YIO-360M1B, and the baffle kit is also the stock Vans kit for the same engine. With the snorkel centered on the fuel injector, the FAB extended an inch past the left intake ramp and side wall. Vans confirmed that this snorkel will be too long since it's intended for the 200hp version.

Yes! Exactly what I have and is exactly what I'm seeing ... I was puzzled by everyone who had the snorkel "just fit"; you can't really mess this up given the non-negotiable locations of the servo intake and left ramp.

I'm feeling "son of FrankenSnorkel" coming soon.

How did you support the center section when you glassed it? foam inside? Did n't look like it..

[humptybump]

If foam sculpting isn?t your forte and you have CAD skills and a 3D printer (or access to them) it?s possible to 3D print the ?plugs? with PLA. After fiberglassing, you warm the the part in the oven to 150F for an hour and it becomes soft enough to pull out.

Details here: http://elder.ninja/blog/p/7512

[scrollF4]

Originally Posted by wjb

Yes! Exactly what I have and is exactly what I'm seeing ... I was puzzled by everyone who had the snorkel "just fit"; you can't really mess this up given the non-negotiable locations of the servo intake and left ramp.

I'm feeling "son of FrankenSnorkel" coming soon.

How did you support the center section when you glassed it? foam inside? Did n't look like it..

WJB,
I screwed each end of the snorkel to their positions on the fuel injection servo and the baffle, then laid two pieces of wetted cloth in place to bridge the gap. This essentially tacked it all into a single piece. The gap between the pieces was small enough that the cloth didn?t sag. Once cured, I removed the snorkel and laid up the rest of the fiberglass.

[goatflieg]

Interesting and timely thread for me; I'll be attacking the snorkel soon. Danny King, I've cut and pasted the instructions you laid out here. Paul K, I've downloaded your photos for future reference. Absolutely love the way it looks on the airplane. Since you're also in Michigan, if there's any chance I could see your aircraft in person, I'd be most grateful for the opportunity. I'll buy lunch. Lunch and dinner. In fact, I'll pay your grocery bill for a week... maybe.

[scottmillhouse]

After all the tales of whoa, surprisingly mine fit with lots of trials and small cuts at baffle side. No butchering and glass work. Appears it is designed to fit a real Lycoming and not a clone. Getting the filter in was challenging due to tight space. I had to take a lot off of the cowl and made a filter cover cap that tied in the snorkel side, side baffle and cover. RV-7A, Vans standard Lycoming IO-360 180 hp.

[pilotkms]

Not sure about your X across the face of the filter. Is there a purpose for it? U may be cutting off 10-20% of the airflow. And u want all u can get. Previous threads about screen material in front of oil coolers indicated significant reduction of airflow. Maybe the engineers will chime in.

[wjb]

Originally Posted by scottmillhouse

After all the tales of whoa, surprisingly mine fit

Clearly, you must be living well and using the correct primer!