|
||
|
 |
|
||||||||||||||||||
|
|
|
#1
03-01-2013
|
||||
|
||||
4 stroke coming
http://www.roarracing.com/?p=1814
ROAR proposes specifications for 1:8 competition 4-stroke engines To encourage the development of new technology for 1:8 nitro racing, ROAR is establishing guidelines for four-stroke engines that, if produced, will be permitted to run alongside the current two-stroke engines at any ROAR National Championship or sanctioned event. Four stroke engines have dominated the SX world, and they’ve eclipsed the performance of the two-stroke engines once thought to be superior in terms of total power and power-to-weight ratio. The proposed specifications are taken directly from the displacement increases permitted in SX racing, and the bore and stroke dimensions are in direct proportion to the engines powering modern SX racing machines. As is often the case, technology and specifications that are ideal in bigger engines don’t always translate to the engines used in RC racing, but as a starting point, these will be the recommended specifications. ROAR encourages any engine manufacturer to confidentially discuss these specifications with ROAR prior to construction using a different specification. Converted four-stroke airplane engines have been tried at random points in our past, but these engines were never configured for high power output, or for the rigors of RC car racing – they were simply airplane engines adapted to fit RC cars. But proper four-stroke technology applied to RC car engines can offer increased efficiency, a reduction in exhaust noise, and as seen in the SX world, potentially much more usable power. Due to the higher number of moving parts, the costs of a four stroke engine can be greater, so economy in the design is paramount. There are some allowances in the proposed specifications that could mean additional costs. These are all open to discussion and perhaps the specifications can be more narrow if it’s proven that a simple and less costly technology can produce similar results to those that are more costly. Proposed specifications: Bore: 23.15mm Stroke: 14.96mm Displacement: 6.30cc (.384 c.i.) Single cylinder only 2 to 4 valve configuration Must use a single camshaft Pushrod or OHC permitted Spark or glow ignition Air cooled only Additional specifications will develop if and when engine manufacturers decide to produce such an engine, but these basic specs are sufficient to begin the discussion.
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD 
|
|
#2
03-01-2013
|
||||
|
||||
|
what fuel do they use nitro or petrol
i would be tempted with anything four stroke 1/8th especially if it uses pump petrol
__________________
B6.1
|
|
#3
03-01-2013
|
||||
|
||||
|
Quote:
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
|
|
#5
03-01-2013
|
|||
|
|||
|
4 strokes are used for aircraft a lot, smoother delivery of power one of the advantages and more torque letting you swing big props
http://www.osengines.com/engines/osmg0830.html this is smaller than the spec given and costs about £130, OS are the masters of these engines in the rc plane world so the tech is there there just needs to be demand to encourage a differant power delivery for cars. One newish development is you can now run electronic ignition on a nitro 4 stroke which means no more glow plugs and it can't be a massive leap to convert it over to gas use. dedicated gasoline engines are around but not so small sadly mostly used in large scale but they sound so good in multi banks listen to this radial engined monster
|
|
#6
04-01-2013
|
||||
|
||||
|
i think i want a 4 stroke buggy that runs on petrol not nitro not 2 stroke but 99 octane petrol from the pump just like my car and my bike ( the 1st production off road bike to come with fuel injection)
petrol 8th buggys thumping down the track im in
__________________
B6.1
|
|
#7
27-01-2013
|
|||
|
|||
|
Quote:
|
 |
|
|
Hybrid Mode
