Scooterotica

RICSPEED wrote:

alcoholic maniacs sc wrote:I'll see who gets the highest figures at the scootershoot out in front of my eyes this year and then put my hand in my pocket for my next engine build.

wise words .. i for one cant wait and it would be a bad move for any tuner not to compete for that reason alone

i know of at least one guy who decided at the last one he wanted the S M

nelson pk wrote:Yes, people do say no two identical motors are the same in terms of jetting etc.
The reason this is, is because lets say you have two guys running TS1's with the same ignition, carb and exhaust.
The jetting could be different and this is mainly due to manufacturing tolerences as explanied before.......port timings maybe slightly different. The combustion chambers may be slightly different on the head due to manufacturing etc.
This is the sort of thing that causes different jetting but if you have a barrel, piston and head where port timings are checked, casings are each done the same, head is checked etc and you stick to the suggested timing with the same ignition and crank and the exhaust is manufactured to the same spec by the same person, the jetting is going to be practically the same on every motor.

Comparing iron barrels to aluminium cylinders again is like chalk and cheese in my opinion.
Iron barrels are ok and are not the work of the devil but the fact is you can run tighter piston to bore clearances on an ally barrel and a nicosil coated ally barrel will last longer than an iron barrel in the same state of tune and that is fact. Nicosil wears less.
Ally barrels are more expensive but again it depends what you want...........the best is expensive.......not so good is cheap, as with everything in life.

wack 63 wrote:So all you need now is someone to make kits based on your motor

eden wrote:

soulsurfer wrote:Yes Eden but even taking the scale into consideration, these two graphs look very different to me

to compare them you need to look at the bhp/torque at given rmp's

at 5500 rpm my engine is doing around 18 bhp the monza is doing less than 15 bhp

at 6000 mine is doing 22.5 bhp the monza is doing slightly less

at 6500 mine is doing 26 bhp the monza is doing about 25 bhp

at 7000 mine is doing about 27 bhp the monza is doing about the same

at 7500 mine is doing 25 bhp the monza is about 26 bhp

at 8000 mine is doing 22 bhp the monza is about the same

at 8500 mine is doing about 21 bhp the monza is doing about 12 bhp


the torque is a similar story. just the monza has less


the graphs dont look the same because of both the scale and horizontal stretch. the only way to compare the graphs is to plot the figures from one graph onto the other, then they look very similar, infact the monza is more peaky than mine!

eden wrote:no p1551ing, just giving a real world comparison

nelson pk wrote:However all the high end barrels come in aluminium and nikasil lined for these reasons.....cooling and wear properties. Fact.

nelson pk wrote: As i said, cast iron can be reliable and its cheaper but is it considered to have better properties than aluminium barrels?........i dont think so.