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    OMEN RACE ENGINES

Race Modified Zenoah G231PUM and G260PUM Engines

 

               

     OMEN RACE ENGINES modifications involve:

   # Inlet Port Timing : increasing the inlet timing allows the engine to pull more fuel and air in, in turn creating more crankcase pressure. This is a critical factor in gaining bottom end horse power.

   # Transfer Ports : now we have the inlet port working well, we go to work on the transfer system. Basically we re-shape the transfer ports to give the fuel and air the best chance of getting to the combustion chamber as fast and efficiently as possible. 

   # Compression : Raising the compression plays an important part in gaining the necessary horse power to give you that winning edge. We do this by machining the base of the barrel down, making the combustion chamber smaller or reducing the squish band. 

   # Exhaust Port Timing : Exhaust timing is something that can really dictate the way your engine performs; increasing it changes the position of the power curve through the rev range, therefore increasing it the right amount is where the answer lies.

   # Piston Weight :  We machine the under side of the piston to make it as light as possible but keeping it reliable, also eyebrow the side of the piston on the transfer port sides to help with transfer. 231 pistons weigh about 19 grams and the 260 piston around 24 grams. This helps to let the engine rev up quicker. We also shape the piston skirt on the inlet side to give it a more progressive opening and closing system.

      The Result       

Over the past 2 years OMEN RACE ENGINES have come up with a very fast and reliable package that compares with any modified race Zenoah engines on the market today. During this time Omen Race Engines has had some great results on the racing scene and quickly becoming a force to be reckoned with.

OMEN RACE ENGINES web site: http://www.omenraceengines.com/

2nd Place in Gas Mono at the 2007 South Korea Nationals - Congratulations Mr. Baek

1st Place in Open Gas Hydro at 2008 Battle of the Boarders -  Congratulations Raymond Day

2008 Australian Nationals:   

bullet1st place Open Petrol Hydro - Mark Jordan
bullet2nd place Open Petrol Hydro - Daniel Schaffer
bullet1st place Open Petrol Tunnel - Daniel Schaffer
bullet3rd place Open Petrol Tunnel - Mike Nowland
bullet1st place 23 Sports Hydro - Daniel Schaffer
bullet1st place 23 Petrol Mono - Simon Petrony
bullet3rd place Open Petrol Mono - Ray Day

 

 

" Brand New fully assembled OMEN RACE ENGINES "  

  "On Special for a limited time only"

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Omen Race Zenoah G231PUM with standard WT-644 Carb. "Special" $ 485.00 inc. GST     Export price AU$ 441.00  Currency Converter

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Omen Race Zenoah G260PUM with standard WT-644 Carb. "Special" $ 485.00 inc. GST     Export price AU$ 441.00  Currency Converter

 

" Brand New fully assembled OMEN RACE ENGINE with Aftermarket Walbro WT-257 Carb"

 
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Omen Race Zenoah G231PUM with Walbro WT-257 Carb. "Special" $ 515.00 inc. GST     Export price AU$ 469.00  Currency Converter

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Omen Race Zenoah G260PUM with Walbro WT-257 Carb. "Special" $ 515.00 inc. GST     Export price AU$ 469.00  Currency Converter

 

 

 

Stock Zenoah G231PUM and G260PUM Marine Engines

                 

The Zenoah G231PUM (22.5cc) marine engine features an improved cylinder design with 4 transfer ports, high rpm piston with a thin 1.0 mm single ring design, new improved combustion chamber shape that use a compact 10 mm spark plug, large bore carburetor with manual choke plus a factory supplied velocity stack.   All these features give the new G231PUM engine better breathing and higher rpm over the older G230PUM two port engine.

The Zenoah G260PUM marine engine has the same features as the G231PUM engine and includes the same accessories but has an increased capacity of 25.4cc.

Both G231PUM and G260PUM engines use the same Drive Collets and Engine Mounts as the older G230PUM engine, so updating to these new engines is a simple task.

Factory engine ratings:  Stock G231PUM - 4.0hp @ 15,800 rpm.   Stock G260PUM - 4.3hp @ 15,200 rpm. Engine ratings were obtained with the use of a performance tuned exhaust system.   

" SPECIAL INTERNET PRICES"

  "On Special for a limited time only"

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Zenoah G231PUM or G260PUM 4 port marine engine with standard WT-644 Carb "Special"  $285.00 inc. GST.  (Special Export price AU$272.00)

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Zenoah G231PUM or G260PUM 4 port marine engine with Walbro WT-257 Carb "Special"  $315.00 inc. GST.  (Special Export price AU$287.00)

 

           

 

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Copyright 1998 - 2008 Hobby Supplies (Australia)
Last modified: August 20, 2008