Rody VS Racing Engines - Onroad Motors
#331

#332

Has the European union rules change again for nitro content? I thought the maximum was 16%? If this is the case why has Efra now changed to by weight over volume? Is all very confusing when Energy and Runnertime both have 16% fuels that give performance of a 25% nitro fuel.
Because there is no real affordable(cheap) method of measuring the nitro content of a fuel during a race event. The NITROMAX has been invented which gives a limit to the nitro% used in the fuel by measuring the density.
Some fuel manufacturers have found some solutions to alter this density by changing the type of oil used in the mixture and so they can increase the nitro content, with the result more power. But for me sometimes this also reduces the lifespan of the engine and reliability.
#333

I think these high energy fuels probably also come with some Ethanol mixed that has a higher burning energy. As mentioned only the gravity of weight is checked not the ingredients.
#334

Does anyone know if the sleeve of the r04 is 2103 based or euro spec based?
#335
#336
Tech Adept

Hello Rody,
With how many shims does the VSR-05 come? Is ot build to run on 16% by weight? Can I run ot on 25% without doing anything to it or should I add shims??
With how many shims does the VSR-05 come? Is ot build to run on 16% by weight? Can I run ot on 25% without doing anything to it or should I add shims??
#337

When I ran this motor on 25% I had to run the rp8 plug, to avoid detonation. I changed nothing else. On 16% the rp7 works and the engine runs very well. This was my experience.
the head button on the r05 has a depth of 3mm while the 2104 has a depth of 3.5mm from the squish band to the center where the plug sits.
the head button on the r05 has a depth of 3mm while the 2104 has a depth of 3.5mm from the squish band to the center where the plug sits.
#338

The VSR05 comes with 1 copper shim(0.1mm) and 1 alu shim(0.15mm) the engine can be used like this with 25% nitro. Depending on the track or outside temps. Sometimes a RP8 plug is needed to avoid detonation, or adding another shim of 0.1mm when using 25%
#339
Tech Adept

Thank you very much for your quick reply!!
I will try it out and see!!
I will try it out and see!!
#341

Then you need to open the engine at the combustion chamber and if it looks like it is sandblasted then you have had detonation.
#342

The combustion chamber as also the top of the piston must have an equal colored layer with (depending the fuel) some darker edges/lines.
If the colored layer has all over small spots with a lighter color then you are on the edge of detonation, if you are over the edge then it will look like sandblasted as Rody says.
If the colored layer has all over small spots with a lighter color then you are on the edge of detonation, if you are over the edge then it will look like sandblasted as Rody says.
#343

Thank you Cant drive for to share your experience.
The VSR05 comes with 1 copper shim(0.1mm) and 1 alu shim(0.15mm) the engine can be used like this with 25% nitro. Depending on the track or outside temps. Sometimes a RP8 plug is needed to avoid detonation, or adding another shim of 0.1mm when using 25%
The VSR05 comes with 1 copper shim(0.1mm) and 1 alu shim(0.15mm) the engine can be used like this with 25% nitro. Depending on the track or outside temps. Sometimes a RP8 plug is needed to avoid detonation, or adding another shim of 0.1mm when using 25%
#345
Tech Regular
iTrader: (3)

The combustion chamber as also the top of the piston must have an equal colored layer with (depending the fuel) some darker edges/lines.
If the colored layer has all over small spots with a lighter color then you are on the edge of detonation, if you are over the edge then it will look like sandblasted as Rody says.
If the colored layer has all over small spots with a lighter color then you are on the edge of detonation, if you are over the edge then it will look like sandblasted as Rody says.