Quote:
Originally Posted by micoulisninja
sounds fine Bruce and must be a little beast in mid range torque-wise...
I guess you also used the 300 rods to keep the same engine height...
however a couple of things still make me wonder... stock head has tiny intake ports and valves for oem displacement...if still stock there, with the extra cc doesn't it "choke" on the high end ?? unless you mean 300 stock... did you need to evaluate anything concerning mean piston velocity or is it safe (250 18,23m/sec 300 cranking on 250 electrics 21,64m/sec for the piston at 13250rpm...)wiseco piton lighter than stock (stock is 124grams, 130 with rings plus 36 with oem pin)??
I bet you still have some upgrades to go...well done !! 
can't wait for those figures from the dyno... |
Even with the 300 rods the pistons stick up past the deck. Ideally the 250 rods are better for torque production but are about 7.9mm to long. I might try these on the next build. I think the timing chain will be long enough and I will have custom rods made.
As far as the head, I went with the stock cams, valves and 250 head just to see what the power increase was on a budget. After all there is something to be said for port velosity and power production. I dont think im at the flow limimt of this head as the engine pulls HARD to the rev limiter.
My bike is much faster than the 250's I run with at the track, so much so that I will probably end up running up a class with the SV650 and such. When I get to a point that I need some more HP I will go to the longer rods, 300 head and 32mm flat slides.