REFLECTOR: Need for speed

Tue May 21 10:57:21 CDT 2013

I would think you are heading more to the super charger if you are already working out the new exhaust layout, otherwise with turbocharging that is also going to dictate how your exhaust is run. Or am I missing something on your exhaust design?
You can also get into lighter weight automotive turbos for less money.

Doug K

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Geoff Gerhardt
Sent: Tuesday, May 21, 2013 4:46 AM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Need for speed

Guys,

Ok, in my pursuit for more speed, I have narrowed down on two mods.  Definitely will be changing my exhaust - I'm working with Clinton at Custom Aircraft on this.  He is quoting some pretty big numbers (+18HP) for switching from the standard Velo exhaust (2x2-1) where each cylinder is battling the other to a 4-4, we'll see.  I am looking forward to better cooling as I won't be adding pressure to the lower cowl with the exhaust hole cutouts (pretty big on mine), and exhausting out the cowl will create a lower cowl pressure to draw cooling air out.

Now, for the big speed increase, turbo or supercharging (normalization).  I'm exploring a couple options there.  There's a guy close by who has a complete RaJay turbo normalization system for an IO-360 off a Mooney.  Its been rebuilt.  He says its a very simple system, manual wastegate. I still haven't got a price from him, tho, and I expect it will be $20K+, tho.  The other option is supercharging.  I talked to the guy from Forced Aeromotive<http://www.forcedaeromotive.com/homebuilt.htm> yesterday.  Their system sounds pretty bulletproof and simple and provides 8000' of TN.  That is, at 8000', you still have 30", flying at 10,000' would be like flying at 2000' without it - you get the idea.  It has no wastegate, the manifold pressure has a redline of 30" that you're not supposed to exceed, so at a low elevation field, you would not take off with full throttle, just advance it to 30".  As you climb, just keep nudging it up to maintain 30".  It is a nice, simple install and costs ~$10K.  Apparently, you can climb like a bastard with it, and can expect >15kts increase at cruise.  I'm leaning more towards it than the turbo.  The one big advantage to the supercharger is that it has a pretty cool air charge (unlike the turbo that, even with an intercooler, the air produced is hot).

Any thoughts?  Anyone had experience with turbo/supercharging an IO-360?

Geoff

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