ANYONE RUNNNING A CLINE REGULATOR AND ULTRA THRUST MUFFLER?
09-10-2007, 01:37 PM
#1
Senior Member
Thread Starter
ANYONE RUNNNING A CLINE REGULATOR AND ULTRA THRUST MUFFLER?
I posted this question in the glow engine forum, but I thought one of you speed guys might have an answer. I just received my Ultra Thrust muffler for an OS 91 FX that is presently configured with a Cline Fuel Regulator. In speaking with the Dave at Performance Specialties, it was mentioned that there could be issues with the Cline Regulator which uses crank case pressure for the fuel tank and the Ultra Thrust muffler. It was mentioned that the Ultra Thrust muffler may affect crank case pressure enough to affect the pressure in the fuel tank. My question: Is anyone running the Ultra Thrust muffler with a crank case pressurized fuel system using a Cline Fuel regulator? If so, would like your thoughts on this configuration.
09-10-2007, 08:56 PM
#2
Senior Member
My Feedback: (13)
Join Date: Jun 2004
Location: Merced, Ca.,
CA
Posts: 2,118
Likes: 0
Received 0 Likes
on
0 Posts
RE: ANYONE RUNNNING A CLINE REGULATOR AND ULTRA THRUST MUFFLER?
airbusdrvr:
My original thought was "another reason I run YS engines". If it does not work well in the plane, you have a few options that are somewhat reasonable. I would first try the other brand regulator which works on motion and should not be affected by the pipe. Changing the size of the pressure supply line hole is another option I would not recommend as you can quickly kill the pipe. You can partially fill a copper fuel line and drill different sized holes in it to try lower pressure, or fix a oversized application at the pipe, this is trial and error, but you can eventually get it close enough. One drill size will make a difference. Does that engine have a crankcase tap? Just another area to tap if you need to look for more pressure. Frankly I wonder why a Ultra thrust muffler on a OS 91 FX. Believe the engine is designed for grunt, the pipe addition will give you more rpm, but to what end. If you want to go fast in this engine size, you need a Jett 90LX good for over 14K, the OS starts out around 10?. Yes, the Jett costs almost twice as much as the OS. Yep, its worth it and will outlive at least 4 OS engines, honest. Jett engines become cheap after the first year, very cheep the second, on and on and on. Still have not worn one of my 5 out, but keep trying!! ENJOY
My original thought was "another reason I run YS engines". If it does not work well in the plane, you have a few options that are somewhat reasonable. I would first try the other brand regulator which works on motion and should not be affected by the pipe. Changing the size of the pressure supply line hole is another option I would not recommend as you can quickly kill the pipe. You can partially fill a copper fuel line and drill different sized holes in it to try lower pressure, or fix a oversized application at the pipe, this is trial and error, but you can eventually get it close enough. One drill size will make a difference. Does that engine have a crankcase tap? Just another area to tap if you need to look for more pressure. Frankly I wonder why a Ultra thrust muffler on a OS 91 FX. Believe the engine is designed for grunt, the pipe addition will give you more rpm, but to what end. If you want to go fast in this engine size, you need a Jett 90LX good for over 14K, the OS starts out around 10?. Yes, the Jett costs almost twice as much as the OS. Yep, its worth it and will outlive at least 4 OS engines, honest. Jett engines become cheap after the first year, very cheep the second, on and on and on. Still have not worn one of my 5 out, but keep trying!! ENJOY
