Engine basics > Engine set up tips
PIPE Chart List Setup
Rob Duckering:
--- Quote from: Steven Yampolsky on April 10, 2014, 07:57:22 AM ---The only problem is figuring out exhaust timing of a OS 40VF LL~
--- End quote ---
Actually, the 40VF is on the chart with higher timing than the PA. Use 140-145 degree's and pipe accordingly as per the chart from Randy.
My first PA ship was a magnum winged SV fuselage airframe with an OS 46VF and a Randy pipe set at 18.5" with a launch rpm of 10K. Worked great with no geusswork at all.
Steve Helmick:
That's one of the things that has confused me...is the .40VF higher exhaust than the .46VF or lower? Is there more difference between intake and exhaust timing on the .46? They have a rep for being a bit more, uh, 'rambunctious'.
My .46VF is at 18.75", but it's also an AAC...and I don't know if the timing is same as stock .46VF or if it's per the .40VF that so many prefer. I'm launching at 10,450 to 10,500. Randy? ??? Steve
RandySmith:
--- Quote from: Steve Helmick on June 18, 2014, 09:16:47 PM ---That's one of the things that has confused me...is the .40VF higher exhaust than the .46VF or lower? Is there more difference between intake and exhaust timing on the .46? They have a rep for being a bit more, uh, 'rambunctious'.
My .46VF is at 18.75", but it's also an AAC...and I don't know if the timing is same as stock .46VF or if it's per the .40VF that so many prefer. I'm launching at 10,450 to 10,500. Randy? ??? Steve
--- End quote ---
Steve the motors are very close to the same, as long as you are talking the milder timed ones in both 40 and 46, some people have used the higher timed sleeves, Use the 145 list and you will be very close, the 40 VF normally will use a shorter pipe length, than the 46 because the 46 normally will use a larger diameter prop or a 3 blade, ...ie we used a 12 x 4.5 3 blade, and a 12.25 x 4.25 2 blade with the 46VF, and a 11 1/2 x 4 on the 40 in a 2 blade. The RPM of the 40 was close to 11,100 , and the 46 was in the mid 10,000 RPM range. 18.5 length for the 46 and 17 3/4 . They will vary but this is close
Randy
Mark Weiss:
Randy,
I am new to tuned pipes. I just got a Katana with a PA 61 and CF pipe. If my measurements are right, the pipe is 16 and 1/2" from the needle to the wider baffle dimension. I have a very accurate tach as well as your great chart. The PA is running a 12" 3 bladed prop. Here is my question. When run below 11,000, the smoke trail is blue and the engine runs only 5 minutes on the 6 oz tank. With higher rpm, 11,300 the running time of course increases but the smoke trail is now white and the motor is pretty hot. On a pipe, does the motor basically run a strong run or is it expected to do a 2/4 break? I am using 25% oil, 11% synthetic and 14% castor and 10% nitro. Your recommendations please.
Thank you
Mark Weiss
RandySmith:
--- Quote from: Mark Weiss on July 02, 2015, 07:37:29 PM ---Randy,
I am new to tuned pipes. I just got a Katana with a PA 61 and CF pipe. If my measurements are right, the pipe is 16 and 1/2" from the needle to the wider baffle dimension. I have a very accurate tach as well as your great chart. The PA is running a 12" 3 bladed prop. Here is my question. When run below 11,000, the smoke trail is blue and the engine runs only 5 minutes on the 6 oz tank. With higher rpm, 11,300 the running time of course increases but the smoke trail is now white and the motor is pretty hot. On a pipe, does the motor basically run a strong run or is it expected to do a 2/4 break? I am using 25% oil, 11% synthetic and 14% castor and 10% nitro. Your recommendations please.
Thank you
Mark Weiss
--- End quote ---
Hi Mark
you are doing something very differant, and much higher RPMs than most use with a 61, yours is more like a 49 setup.
I would reset it all, set pipe from the center of the chamber..or the glow plug, to the first baffle in the pipe at 17.3/4 inch
Use the prop pitched at 4.3 to 4.5 inches
Launch RPM will be near the 10,000 range, much power than your using.
You should set the needle at the fastest 4 stoke it will run in, then turn it in untill it is bouncing from 4/2
The fuel should be 20% oil, not 25, and should be mostly synthetic oil. 10% nitro is OK
this should yield about a 5.25 lap and should cycle slightly up and downhill
let me know what you think
Randy
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