Pressure tap for the OS 1.60

[rcaerobob at cox.net]

Drilling the backplate means there is NO risk, whatsoever, of little shavings/parts getting into the motor, since it's removed when the drilling/tapping is done.

Also cheaper. :-)
> 
> From: "Grow Pattern" <pattern4u at comcast.net>
> Date: 2004/12/02 Thu AM 11:43:06 EST
> To: <discussion at nsrca.org>
> Subject: Pressure tap for the OS 1.60
> 
> You don't need to drill and tap the backplate. These is a much simpler method that does not mark or change the engine externally should you decide to sell it later etc. (Also that is a thin backplate to be tapping!)
> 
> Looking from the rear of the engine, the top left backplate bolt can be replaced with a standard OS 1.40 EFI bolt/pressure-nipple. 
> They cost about $6 and your local hobby shop can get them from Great Planes etc. 
> 
> Remove the backplate and run a 1/16" drill through the center of the threaded part into the crankcase. I put a piece of brass tube over the drill-bit to protect the threads in the crankcase. (You can see, in the casting the metal that is there for the pressure tap of the 1.60 FI.) You can do this without taking the engine apart. Just stuff some paper towel into the crankcase and also vacuum afterwards.
> 
> If you decide to later decide to dispense with the pressure tap just put the crankcase bolt back in, No harm  no foul!
> 
> I have used the Perry pump and the Cline regulator on a bunch of OS 1.60's. The Perry's had problems - three of them - and the Clines worked like clockwork - five of them. Go figure?
> 
> 
> Regards,
> 
> Eric.
>   ----- Original Message ----- 
>   From: randy10926 at comcast.net 
>   To: discussion at nsrca.org @nsrca. 
>   Sent: Thursday, December 02, 2004 11:11 AM
>   Subject: FW: OS160FX setup
> 
> 
>   It seems to me that tapping the backplate for crankcase pressure is common to most of the options.  So that is a good place to start.  I seemed to have deleted the past email on how to do this.  Can someone describe it again?
> 
>   Randy
> 
>     -------------- Forwarded Message: -------------- 
>     From: randy10926 at comcast.net 
>     To: discussion at nsrca.org (discussion at nsrca.org @nsrca.) 
>     Subject: OS160FX setup 
>     Date: Thu, 02 Dec 2004 16:01:50 +0000 
> 
>     Looks like too many choices for a non-mechanic like me.  But I am really tired of watching others fly in the contest, while I nurse my engine.  Or almost as bad, nursing my engine while I am flying the sequence.  I am looking for a very reliable, consistent setup.
> 
>     Having got that off my chest, I wonder if anyone has figured out how far back from the engine you can go with a bladder tank?  Seems to me that having a 18oz tank next to the firewall has to result in trim changes during the flight.
> 
>     How do you pressurize a hopper or header tank?   Is crankcase pressure too much if you are running a hopper tank.
> 
>     Randy
> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net

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