Salisbury
Power Pipes
EQ 30
The perfect standard / sports pipe for .25 to .32 engines.
EQ 30H
The absolute best pipe for .28 / .32 size helicopter use.
EQ 45
The perfect standard / sports pipe for .34 to .50 engines.
All of the Salisbury EQ (Extra Quiet) Pipes are renowned for their broad power range and very effective noise suppression. Their strength for weight is exceptional. All the above are optimised for 11,000 to 13,500 rpm.
All Salisbury EQ Series Pipes have an optimum 'operating length'. This length is quoted as a distance in mm from the exhaust (piston face) via any curves in the alloy header pipe to the first baffle inside the pipe. The system's length is varied by shortening the header (preferred as it is heavier than the C/F), or lengthened by adding a spacer to the system... usually by inserting a length of header cut-off, inside a longer piece of silicon (available from Bolly Products).
To find the pipe's first baffle, insert a rod inside the pipe until it contacts the baffle. Mark it's position on the outside of the pipe. .... Caution.... the first baffle has a hole in the centre, double check that you haven't found the second baffle.
Important: This pipe / muffler should be rubber mounted at or near it’s C of G. Excessive heat and vibration are the biggest destroyers of exhaust systems (metal or composite).We use the Bolly 'Tuned Pipe Mount' combined with a Bolly Iso-Mount and a cable tie for the rearward attachment.
These pipes will work at any reasonable length, however only trial and error will find the best combination of pipe length, prop size, head clearance and fuel etc. Below are the recommended lengths from our development testing. Use only as a guide as there are literally thousands of possible combinations.
Low rpm = longer pipe ; Higher rpm = shorter pipe. When in doubt, use the pipe long. It is a safer option than being too short.
EQ 45
@ 470mm - Bolly 11.25 x 8,
11.25 x 6.5 3B or similar
11,250 rpm
EQ 30
@ 450mm - Bolly 10.5 x 6.5
or similar
12,2500 rpm
EQ 30H
@ 430mm – For helicopter use
13,250 rpm
Pipe too short: = frequent blowing of plugs Pipe too long: = prone to burbling rich running
= overheating engine = low power, low noise levels
= sags under load - ie in climbs
= harsh and / or lean running despite taking off with a good needle setting.
Please note: The symptoms of being too short may also occur if the engine is over compressed (often the case when using a pipe on an engine not specifically designed for pipe use) ....... Using a pipe will increase the effective compression ratio of an engine. (as will adding more nitro to the fuel). Add a .1 to .2mm shim under the head to decrease the compression.
Beware: Some of the newer 2 stoke engines have very low exhaust timing (below 145 degrees), and do not respond as they should on a pipe. If the engine is too low on exhaust timing, the pipe may cause poor throttle response or even inhibit the engine performance. Such engines will usually go rich with throttle transition from idle to full power. In these cases, use a very long pipe (it will now act like a muffler) and a hot plug.