Yes, yes, Gorilla and Scooter Bob built a totally bitchen bike. Moving on... How's progress on the UCE Fireball going?Scott
Rocker arm prototypes for the UCE project have been shipped and are on the way to us for evaluation.Things are progressing, even if slowly.
When you do piston development, do you need to do it 100% from scratch? Or can you get 'blanks' of some sort that are about right and mill them to exactly what you want?Scott
Since we already know that the AVL piston squish is not in the proper spec, and we also know that the stock UCE squish is not in the proper spec,(contrary to others' conclusions) the AVL piston would require being set to a different deck height in the bore than the stock piston is set at, which can be done with some small amount of work involved.
I know, right? Those engineers at RE are sure dumb not to get the squish area JUST right on every one of the 150K bikes a year that they make! Seems to ME that they run pretty good ..... and they'll run better with the AVL piston in 'em - especially since it's the same nominal bore size, weight, pin height and all .... but with a flat top. A feller COULD spend a fortune or a lifetime to re-invent a AVL piston - or he could just buy one and put it in there and have a little more zoot ...... Just sayin' ..... and concludin' ......
I don't doubt that replacing the existing UCE piston with a AVL piston will raise the compression ratio (assuming the cylinder is mounted at the same height) and result in some power increase. This increased power does come with some risk though.The revised combustion area with a flat topped piston may be more prone to pre-ignition or detonation which the relieved dome piston helps to prevent.Using higher octane fuel may be necessary to keep this from happening. On the other hand, it may not be enough by itself. While this AVL piston swap is a simple thing to do, it will not maximize the power that can be obtained though.When maximum power is the goal, improving the entire combustion area with a properly designed piston crown and modifying the combustion area to create a proven squash type combustion chamber is needed.IMO, the original UCE combustion zone was designed to create modest gains in power and high reliability while giving the best fuel economy while using low octane fuel. This goal was reached with the existing design. Ace on the other hand is looking to get the greatest power out of the engine without sacrificing reliability or creating a engine that needs 100 + octane fuel.While using the AVL piston in place of the original UCE piston is an option, making it the only option would tie his hands and keep him from reaching his goal of developing the maximum power possible.At least, that's the way I see it.
While this AVL piston swap is a simple thing to do, it will not maximize the power that can be obtained though.
But it WILL maximise the amount of money left in your wallet - I just can't WAIT 'til the Gashouse Gorilla takes HIS stock, dished piston out and tries the AVL slug ....... !