Originally Posted by Papa Outlaw:
Our BIGGEST concern is as Dad says it is cheaper to buy a used engine then rebuild....Corralla Rods are $1600 a set + pistons and risk pins along with rings it is over 2 grand then all the "SPECIAL" work while you are in there can lead up to MAJOR bucks...Cycle Image of Jacksonville just built a Track Bike GSXR 1000 with "ALL" the goodies internally and it was $8500.00 THAT IS OUR BIGGEST CONCERN!!!
We need "CHEAP STRAIGHT OUT OF THE BIKE" engines..My engine (stock on gas..87 octane) in the 92 is going on 3 years now and 45 races...the compession has not dropped but 5% and it is BONE STOCK but we do not run BIG 1/2 miles or WINGS...both are motor killers.
So I have no problem with Mechcanial injection at this time...if it is proven an advantage over "STOCK" TB we would add a % of weight...problem solved....STOCK ENGINES at a later date we conould possibly og to STOCK TB...41mm thoat and STOCK height....easily checked go or no go
I think that maybe Papa Outlaw has been hanging around them Florida four legged race tracks with them oat burner racers too much "WEIGHT" you got to be kidding me.
Stock is better!!! Stock rods in a motor producing somewhere around stock rated horsepower will last a long time, especially on smaller tracks. Now if you get the compression up around 14.5-16 to 1 you got a different animal. Cylinder pressure increases exponentially and you have invented a bomb. The goal of an engine builder is to increase the cylinder pressure without going over the limit, thus the need for fancy rods and super duty forged pistons.
I have yet to see a stock compression ratio aftermarket piston. That would be a special order item from JE or Wisco. How much do you want to bet our Kansas friends will order a special stock compression ratio piston to replace that old 20,000 mile stock piston in their rebuild.
Horsepower is a factor of VE "Volumetric Efficiency". The more Fuel and "AIR" you can cram in the cylinder and the tighter you can compress it the bigger the bang is going to be and the more horsepower you will make. Our engines were designed to work right at the limits the engineers wanted them to work in. The rods are not too big, excess weight and not to small too light for the designed parameters. The same holds true for pistons and crankshafts. If you exceed the VE designed by the engineers and you get a much larger charge in the cylinder you will experience major problems.
Scott it is unlikely your porting will reach this limit, but if you also throw in bigger valves and a little more radical cam and springs you may very well cross the line, now you will need them super rods and since you went that far you might as well throw in some high compression pistons as well. Now according to MMSA you are a cheater, and we can see all that stuff with a snooper scope.
So don't get carried away.
About the only thing mechanical injection will do is squirt a whole lot of fuel in the cylinder, by doing this you add to the cooling affects of methanol, you also add to the methanol content of your oil pan. It will not increase VE one iota thus no more HORSEPOWER. In fact with electronic injection the atomization affect of the high pressure , We use about 70-75 PSI better breaks down the the fuel for better combustion, and those little "shower" injectors on top actally act as an air conditioner for the intake charge on them hot Indiana summer evenings.
Honest Dad himself
after 65 some of us just stay in that last childhood?