question regarding header & tuned pipe - fuel injection control systems

[Henderson,Eric]

Just as an FYI, The OS 1.40 and 1.60 EFI and FI respectively have solved most of the common pipe tuning issues. You just get it close, and off you go!

The details - To set the engine you put the throttle servo arm/stick at 1/2 throttle and connect the push-rod to the carb which has a 1/2 throttle barrel marker on it. Then you move the stick to the low throttle marker and "beep" the end-point button on the injector control unit. Move stick to high position and beep again.

You only do this once!

Now you start the motor. The high end will be close. It will idle from the get go! You go fly. If it is lean or rich in the air you dial the right amount of mixture from another channel. ( I usually set for vertical to make sure it does not go lean in that attitude). The best part is that you can also set the mid range transition around 1/2 throttle so that there is no cough or stall "moment" when throttling up in the air from say, a long down-line.

The 1.60 cost me about $700 at my local hobby shop and is making 2-cycle driving a lot more fun. A firmer soft mount has taken care of the injector woes that many suffered in the early days. Looking good with 340 plus runs so far on same injector... (I know - Famous last words!).

What is really good is that when you change props you can tune the mixtures without tuning the pipe. There are limits to that statement, but I can go from a 16 x 14 all the way up to an 18 x 12 and not touch the pipe.

The FI has tach & temp data that helps this process. This is a "toy" that works,....

Eric.


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Bill Carpenter
Sent: Tuesday, March 25, 2003 11:57 AM
To: discussion at nsrca.org
Subject: Re: question regarding header & tuned pipe


WOW, an adjustable pipe coupled to the throttle - sounds like a million 
dollar idea.  If there isn't already a patent on it, maybe you could develop
one.  Let me know when you get it perfected and I'll buy at least one.

Bill
   
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