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PRESTWICH TUNED PIPES FOR GAS ENGINES. 
 Zenoah Engine Tuning Software   Zenoah Marine Engines  
  
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NEW SIGMA 51" mono deep V

These high power tuned pipes are made from lightweight stainless steel, silicone bronze welded and guaranteed not to crack or breakup. They are very high performance pipes but are also suitable for sport boats and are complete with detailed instructions on getting the best from a tuned pipe. They fit over all the normal 7/8" (22mm) headers.  At the recent World Championships in Slovenia a Zenoah G260PUM powered boat using CS23 pipe was faster than the Quickdraw powered boats and faster than most of the 35cc boats.

CS23  lightweight, high performance, watercooled, stainless steel silenced tuned pipe for Zenoah/Quickdraw 23cc to 27cc engines The front part of the tuned pipe is watercooled but the water does not enter the tuned pipe, it only surrounds the header pipe. The silencer is a low resistance multi-chamber type and with other silencing measures can help to reduce the boat noise to below 82 db. The front pipe is 7/8" id  (22mm) and will fit over most. A  = 20"(500mm),  B = 2.4"(60mm),   C = 7/8"(22mm),  D = 2"(50mm) NO STOCK   CS23A  Same stainless steel (brushed finish) pipe as CS23 but with integral watercooled adapter that has 2 internal silicone o-rings and waterchannel that slides over the header to give a sliding watercooled joint. No other coupler such as teflon or silicone is needed and in normal use the internal o-rings will last for many hours. Dave Marles Designed £129.00   CS24A lightweight, high performance, watercooled stainless steel silenced pipe for Zenoah and Quickdraw. This pipe has a short silencing section to fit inside deep V boats.Same pipe as CS24 but with integral watercooled joiner that has 2 internal silicone o-rings and waterchannel that slides over the 22mm (7/8") header to give a sliding watercooled joint. No other coupler such as teflon or silicone is needed and in normal use the internal o-rings will last for many hours. The silencer is a low resistance multi-chamber type and with other silencing measures can help to reduce the boat noise to below 82 db.  Dave Marles designed   A = 14.5"(370mm),  B = 2.4"(60mm),  C = 7/8" ( 22mm) £129.00 CS26 lighweight, high performance, aluminium silenced pipe for  up to 28cc gas engines. Ideal for converting the noisy Chinese RTR boats to enable their use under European noise laws.   The front pipe is 7/8" id  (22mm) and will fit over most headers, Hanson, MD etc and has a built in watercooled joiner that has 2 internal silicone o-rings and waterchannel that slides over the 22mm (7/8") header to give a sliding watercooled joint. No other coupler such as teflon or silicone is needed and in normal use the internal o-rings will last for many hours. £82.00 CS28Stainless steel watercooled  tuned pipe with built in silencer and watercooled sliding coupler. Pipe length is adjustable but with this wrap forward type manifold can be fitted inside many mono boats. Fits over 22mm / 7/8" header pipes. £59.50 CS29 Stainless steel full kit of wrap forward  watercooled manifold and watercooled stainless steel tuned pipe with silencer for deepv boats. Pipe length is adjustable. £79.00 CS29AStainless steel full kit of 90 degree watercooled manifold and watercooled stainless steel tuned pipe with silencer. Pipe length is adjustable. £79.00 CS29BStainless steel full kit of watercooled Wrap To Centre ( WTC) manifold and  watercooled stainless steel tuned pipe with silencer. Pipe length is adjustable.  £79.00 CS29CStainless steel full kit of watercooled 105 degree manifold and  watercooled stainless steel tuned pipe with silencer. Pipe length is adjustable.  £79.00 CS31Stainless steel one piece Wrap To Centre ( WTC) manifold and  stainless steel tuned pipe with silencer. Pipe length is adjustable.  £65.00 CS30  Stainless steel watercooled tuned pipe with silencer. Slides over 22mm ( 7/8") headers with clamp on fitting. £59.50 CS31  Aluminium 2" band pipe with aluminium silencer.  With watercooled coupler welded on that slides over over 22mm ( 7/8") headers  £59.50 CS35  Stainless steel silencer. Fits over 14mm pipe. £14.95   ZEN18  90 degree wide bend, watercooled aluminium  flange with stainless steel header pipe 7/8", (22mm)     £25.00     ZEN 18A 90 degree wide bend manifold header only. 7/8" (22mm) diameter. Flange to centreline of pipe 2.4"   (62mm) £15.00 ZEN20  90 degree narrow bend watercooled aluminium flange with stainless steel header pipe 7/8", (22mm) £25.00 ZEN20A. 90 degree tight bend only. Lightweight stainless steel 7/8" (22mm)e OD, 20.5mm id. flange to centreline of pipe 1.5"  38mm £15.00 ZEN21 100 degree watercooled aluminium  flange with stainless steel header pipe 7/8", (22mm). Designed to bring the tuned pipe to the center of the boat on longer boats such as Sigma etc. £29.00 ZEN21A 105 degree watercooled aluminium  flange with stainless steel header pipe 7/8", (22mm). Designed to bring the tuned pipe to the center of the boat on shorter monos and cats. £25.00 ZEN22 Spacesaver watercooled complete header/ manifold for keeping the exhaust inside on monos. Manifold can be rotated to any angle. Stainless pipe 22mm (7/8")   £26.00 ZEN22A Spacesaver header pipe only. Stainless pipe 22mm (7/8")   £14.50 ZEN12  Wrap to Centre manifold stainless steel pipe with aluminium CNC machined cooling block 22mm od (7/8")   £25.00 ZEN28  exhaust flange.  CNC aluminium watercooled flange with orings for 22mm 7/8" header pipes. Very easy to fit. £13.00 ZEN28A  NO LEAK exhaust flange.  CNC aluminium watercooled flange that does not allow the possibility of a water leak into the exhaust gas. Fits most 22mm 7/8" header pipes. £16.50 ZEN27  Exhaust mounting bracket for mono's cats and hydros. CNC machined aluminium. £15.50 ZEN25  Spare silicone o-rings to fit the watercooled header. 6 pieces.  £3.00 ZEN13  Tygon fuel tubing 1/8"(3mm)suitable for petrol(gas). 950mmlong £4.95 ZEN26  Spare high temperature, hard wearing VITON o-rings to fit the watercooled header. 6 pieces . £4.00

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