Its been a great few weeks for the Race Blend 30% fuel in Australasia. Three big wins and counting....... I was fuelling for Craig Underwood in the Truggy final at the NZ Nats last weekend, and his B5 Pro purred like a kitten on its steady diet of Race Blend 30% for the 45 minutes, then sat merrily idling away at the end. The best part is, when Craig opens it up for a look it will be pristine as inside, with a nice slippery gold coating of super high spec oil over everything - just like when it was running at up to 38,000 rpm - fully protected. As a side note - I had to have a giggle today when I read a couple of posts on a local forum here re run times at the recent Nationals. Guys were touting 10 minute plus tanks in buggy for their engines...... Wow - I guess they are trying to impress potential customers for their sponsors, but its sending the wrong message out to average racers or newcomers looking to purchase a motor. If some poor guy reads that and figures he is going to purchase a 10 min tank buggy motor off the shelf and run it with limited tuning skills - he is in for a very unpleasant introduction to gas racing. This 10 minute plus buggy run time fad is BS for the most part. If you run your motor that lean you will be looking at: Inconsistent tune Random flame outs Massively excessive engine wear Refer to the post I put up from Neal Smith at CRE last week. Neal has been around a long time, and he summed it up very well. If you didnt read it, scroll back a few posts and take the time to check it out. Most guys buy an engine to last a season - thats what you hope for anyway. If your sponsored and getting discounted or free engines thrown at you left right and centre, then engine lifespan is not an issue. But if you spend your hard earned dollars for full RRP on an engine that you want to last you 10 to 12 months - dont be tuning it for 10 minute tanks. With most modern high performance fuels containing around 9% - 10% oil (some a little less, so say 9% is a nice average), if your running your ring-less tapered sleeve motor lean enough to get 10 plus minutes per 125ml of fuel, your not putting anywhere near enough oil through it. At 9% oil a 125ml tank of fuel = 11.25 mls of oil per tank Divided by say 10.5 minutes = 1.07ml of fuel per minute through the motor which is spinning at up to 38,000 - 40,000 rpm in a friction fit bore. It doesnt take a rocket scientist to work out that motor is hurting some. Your motor is screaming around the track at those revs using .7 of a ml of fuel per 40 second lap. How long do you think it will last - answer, not all that long before the compression is below par, performance drops off, bearings fail, crank pin and rod wear gets high and flame outs start etc etc. I really dont know what these guys are trying to prove or who they think they are kidding, but consistent 10 min plus tanks in a buggy is sucking on dream pills if you want stable and reliable performance - especially over 45 minute or an hour. Cracks me up :)
Posted on: Tue, 02 Dec 2014 09:28:26 +0000
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