Another engine

[1bad442]

so would the +3 be a more balanced motor than the +4 with and advantage of the lower crankcase volume because of the stuffer blocks. i wonder...

no it would not be a more balanced motor anytime u add stroke u add torque and when u increase crankcase volumn u do lose some efficiency but not enough to offset what u are gaining in torque. plus a hot rods 4 mm does not have as big of a wide open area like a stock crank does basically it has a stuffer block built into the crank . let me put it this way across the board a 4 mm will kick a 3mm,s ass especially down low

 

[1bad442]

i heard the differnce between the 2 is small and heard people say that the +4 anit worth the money to get the cases trenched sometimes

i disagree 1515151

 

[acezeesawtooth]

no, and no, unless you do some modifications.



you could use the longer rod if you raise the jug


removing the bridge will require math to figure out if you can widen the ports that much

what math... and how do they do it in the la kit for a cr intake. im planning on modding mine for a cr reed cage so i wanted to open the intake a little more to adapt to the larger cage

 

[brandoz28]

you need to do a lot of research, software is a huge help as well. a link to get you started

MacDizzy's Two Stroke Technology Exchange - TRX - YFS - YFZ - Glamis Sand Dunes

and one to make your brain hurt

http://www.kreidler.nl/artikelen/performance-tuning-graham-bell/performance-tuning-graham-bell.pdf

 

[scotj77]

good info brando that should scare him away. just send it to a pro bro! there is a lot more to it than meets the eye

 

[brandoz28]

i'm still dumb enough that i'm gonna try it myself! lol

 

[acezeesawtooth]

well its already been ported... im not doing anything other than intake modifications just wandering what i could do to it

 

[brandoz28]

that bridge is in past where you're going to need to worry about for the cr125 cage

 

[Surfrjag]

no it would not be a more balanced motor anytime u add stroke u add torque and when u increase crankcase volumn u do lose some efficiency but not enough to offset what u are gaining in torque. plus a hot rods 4 mm does not have as big of a wide open area like a stock crank does basically it has a stuffer block built into the crank . let me put it this way across the board a 4 mm will kick a 3mm,s ass especially down low

so you would loose some efficiency with crankcase volume and sideload on piston??

 

[1bad442]

so you would loose some efficiency with crankcase volume and sideload on piston??

sideload on the piston would be way less if u used a 5 mm longer banshee rod

 

[1bad442]

what math... and how do they do it in the la kit for a cr intake. im planning on modding mine for a cr reed cage so i wanted to open the intake a little more to adapt to the larger cage

cr reed cage will not fit a stock blaster jug no matter what u do

 

[brandoz28]

the cr125 one will, but not a 250

 

[acezeesawtooth]

yeah im modding for a cr 125 cage and ive gone through read everything you gave me brandoz and watched oconners diy porting and read up on it im confident in the ports that are already there i can see based on stock how much it really is opened up... ill only worry about fitting that cage in my intake... thanks man ill give ya some green for that

 

[1bad442]

the cr125 one will, but not a 250

i assumed he meant 250 my bad

 

[acezeesawtooth]

i assumed he meant 250 my bad

no i already figured that out...

 

[brandoz28]

so you've read all the way through the graham-bell tuning book? that's a metric load of reading lol


so if you have read through all of that you have an understanding that taking the bridge out will affect the average time-area on the port

 

[acezeesawtooth]

yeah i also realized from reading oconners posts in his own diy porting the precision that the intake ports need... they have specific dimensions that need to be contained in order for the intake time area... they are also the hardest ports to get right and the bridge plays in on the boost ports and how you cant raise the ports upwards only bring them down... i think im understanding it now

 

[brandoz28]

now you just need to figure out if taking it out is worth the extra ring wear

 

[acezeesawtooth]

yeah im not taking it out the gains ill experience wont be worth the work and ring replacement... im just focusing on fighting the cr 125 cage... considering a rad valve cr 125 cage but dont know if its worth the dough... sorry bout the thread jacking there oconner

 

[OConnor Racing]

Ring wear????????? From what???