Can I use VP C12 racing fuel in my Quickdraw HT?
The VP C12 fuel will not hurt the HT but it will most likely run slower for you, it definitely produced less power on our dyno when I tried it. The best performance from that engine will come from the lowest octane fuel you have available at the pump. The reason for this is the higher octane fuel does not contain more energy per gallon, it just has a higher resistance to detonation. In reality 87 octane has the highest energy per gallon but it has a lower resistance to detonation. The HT is set up to not detonate on 87 octane and take advantage of the extra energy available in it. One of the reasons we can get away with this is because the combustion chamber is so small. Small combustion chambers resist detonation much better than big ones do. That is why you could never get away with 87 octane running the compression ratio that the HT is running if it were in a 250cc engine or Chevrolet V8. Keep in mind that most race fuels were designed for these full sized engines.
