Nitro Star 12R SS Pullstart
ABC (Aluminum piston, Brass sleeve, CARBIDE plated sleeve), using Formula 1 nickel-carbide plating technology!
5.5mm opening, rotary-type, two-needle adjustment
purple anodized machined aluminum
* These figures are estimates from the manufacturer of the engine. Like most R/C car companies, HPI purchases engines from model engine manufacturers, we do not have a testing lab or dyno to rate our engines.
HPI Nitro Star engines have a 2 year limited warranty. Read our Nitro Star Engine Warranty.
FAQ Question: Why does the Nitro Star 12R engine feel like it loses compression so quickly?
The new coating and the use of an oil ring in these engines means that they feel as though they have low compression when there is no fuel in the engine. When a compression gauge is put on these engines, it will only register 40-50 psi. However, when oil is added to the engine so that the oil ring is filled the compression will jump up to 65+ psi. We are having a number of these engine sent in (about 3-4 per week) where the customer is reporting that the engine has no compression. When we test them, we find that the compression is well within tolerances and that when the engine is ran, it shows no sign of having a worn piston and sleeve. In addition, the coating on the sleeve has a silicon coating that makes it more slippery than chrome, so it doesn't feel like it has as much "pop" even though the compression is still good.