ORIGINAL: jeffie8696
Surprised me the first time I read it. Makes sense though. I believe Porsche also uses a similar system. And the Sportsters have no less than 5 intake ports. But according to my testing they are not high rpm runners as you would expect but rather low rpm grunt machines that just love big props and plenty of nitro. For example my K&B Sporty .20 makes 12,300 on a 10X5 Master Airscrew on Sig 15% nitro 20% castor. That is 4.32 lbs thrust at 58 mph. That should pull around my HOB Mustang well.
I think if you check into it, you will find the Porsche does the samething as Mazda and Bmw are doing with there all aluminum engines. They run an aluminum piston in a Nickelsil plated aluminum block. That is the way my Mazda is done too. Every time I read it, I think of OS nickel flaking problems. But they are useing a much cheaper style of nickel plating.[X(] The only bad thing with this, is the fact that it is now in the case of the Mazda and BMW a non servicable block. If you score a cylinder, you buy a new block (boring and honeing is not possible with these). It could be a very expensive rebuild.