SledStew & Trickedxcr
Good points & questions.
SledStew, Your exactly right.........That is exactly why I am going to run these motors for 2 years before I believe any of it.
Trickedxcr - Your example is exactly why I am doing this & you are 100% correct. - First, I have had a few of Robs 975 in the shop and 183 hp is awesome to me. I looked the porting over and it was all pretty basic. The 05 cylinder is pretty good stock and the 06 is better yet.
Stock 900 -( 860cc ) - 155/2 = 77.5hp per hole, 77.5 X 3 ( 1290cc ) = 232.5 hp with stock cylinders.
Now Robs 975cc 183hp /2 = 91.5hp per hole, 91.5 X 3 ( 1462cc ) = 274.5 hp @ 7800 rpm *( Now make Rev it up where a triple is happy ) 8500 rpm+ and you got 300hp + by accident. ) in trail form.
So from a 1290cc to a 1462cc - ( 175cc ) increase in displacement. the motor gained 42hp.... thats 14hp per cylinder for the bore increase of 57.5cc per hole. ( Thats awesome to me ) I'm Not expecting anymore then that.
So a 1462cc with mild porting would be 275hp in trial form out of OEM cylinders you can buy on ebay for $100 to $225 each.
( then you add the normal gain ) that happens when you go to 3 cylinders and you increase enigine speed and the 1462cc will be over 300hp
A W/C 1500cc needs Custom Cast cylinders to the tune of $1500 to $2000 each when finished.... depending on who ports them. Then the case work is staggering.
I am not doing this to sell motors, Its a sell centered thing for me and a few of my buddies and a few customers that are dieing to try them.
I have told them they will be very low cost and dollar for dollar almost impossible to beat for the money. ( normally aspirated. of course ).
I have no intention of this becoming so huge sale venture. ( These little to no money in big motors )
I only posted it because it seemed like a fun project and the mock up results look good.
The track will tell it all, These guys all have w/c motors now. If the Motors are gutless the world will find out. ( Thats how the internet works )
This an't a my motors can beat your thing. A few customers & friends want to try it so who am I to say no ?/
The first 3 guys I showed what these motors are going to be all wanted them without question. ( they know some things work and somethings don't ).
after 2 seasons of testing if they an't what they are cracked up to be I won't build anymore of them simple as that.
I'm damn near 50 years old. I gotta do something to keep my 1/2 empty head clear.
Trickedxcr - I twisted one of my 1200's 9500rpm's last summer. 9000rpm out of 80mm stroke with a long enough rod is not a problem. The 1300 will turn 10,000 in race trim ( if it needed too. )
Let it snow !!!
Dan