Murnan Modified RBM3 Modified Full Ceramic 2011 $549.00


RBM3 2011 Full Ceramic. The new Murnan Modified Full Ceramic RBM3 for 2011 is now available. The engine has an increase in power over last year?s model, without sacrificing much runtime. The engine has been in development over the past year with feedback from some top level on road drivers, at top level on road racing events around the world. The new design has been track, and dynamometer tested to ensure that the engine is faster, and still easy to tune. The engine is also still getting enough runtime to easily finish a 5 minute qualifier in any conditions, even with the most aggressive drivers. The power increase can be attributed to new sleeve, and crankcase porting. New crankshaft timing, and special ceramic main bearing. The crankshaft also has a new, more balanced design, which helps overall power, and r.p.m. The new carburetor allows for very easy tuning, and restarting when the engine is hot. The new cooling head design keeps the engine temperature over 20 degrees cooler than last years model. Ceramic front, and rear bearings.

TUNNING TIPS……

The RBM3 engine has been constructed with the finest materials, so break in will take longer than normal with the engine, but will reward you with very long life, and ease of tuning. For our pre-run in engines you will want to run approximately 10 more tanks of fuel to get the engine to race tune. This has been done at our facility, but it is just good practice to start the engine rich, and tune in instead of starting lean, and having to richen the engine for different climates. The different climates dramatically effect the needle settings for the engine. That is why the engines will come to you very rich.

The BASE needle settings for the RBM3 engine is as follows:
High Speed Needle = 6 Turns out
Low Speed Needle = 3 turns out
Mid Speed Needle = Flush with carb body

Approximate RACE tune needle settings:
High Speed Needle = 5 Turns out
Low Speed Needle = 2 ½ -3 turns out
Mid Speed Needle = Flush with carb body

These are typical settings for the following:
– 16% nitro
– Stock .3mm head shim
– C7TGF Novarossi Glowplug
– Novarossi 2652 exhaust with medium conical header.
– This is after the engine is fully run in, and will usually result in
temperatures in the 270-300 F range. Those temperatures can be exceeded at your own risk.

The most important thing to protecting the engine is to visually inspect the glowplug after a run. If it is shiny, that means there is still enough lubrication, and no damage is occurring. If the glowplug is dry looking, or even worse burnt, and deformed the engine is too lean, and damage is most likely occurring to the engine. In this case you must richen the engine.

Usually it is very hard to damage the RBM3 engine if it has been properly run in. If you see any amount of smoke coming from the exhaust, you are probably OK.

You can use the following turbo glowplugs in the engine:
Novarossi/RB
C6TF
C7TF

http://www.murnanmodified.com/product_info.php?cPath=21_72&products_id=676

 

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