velocity stacks?

Post by **scratchin** » Mon Apr 13, 2009 3:13 pm

got two cbr's one has and one hasn't what's the advantage?

Waza4 · Post by **Waza4** » Mon Apr 13, 2009 3:27 pm

You need stacks.
I bet the one without isn't very smooth to ride (like an on off switch )

Long for torque
Short for top end
Four short ones works well.

firebeast · Post by **firebeast** » Tue Apr 14, 2009 12:07 am

yeah,but stan stephens did dyno work on one years ago and found the best compromise was 2 of each. i remember he did loads of testing each way with a race can and standard and it always came back like that.plus he didnt know 100%why.he just said honda got it right first time so left it.it isnt like that on most fours though.

PARUS · Post by **PARUS** » Tue Apr 14, 2009 12:28 pm

firebeast wrote:yeah,but stan stephens did dyno work on one years ago and found the best compromise was 2 of each. i remember he did loads of testing each way with a race can and standard and it always came back like that.plus he didnt know 100%why.he just said honda got it right first time so left it.it isnt like that on most fours though.

But latest model of NC29 has 4 short stacks. Correct? And in case yes, why they had changed them to all short.

Post by **tanuki** » Wed Apr 15, 2009 8:35 pm

it true the latest model has 4 short and the HRC ones are tiny.

PARUS · Post by **PARUS** » Wed Apr 15, 2009 10:10 pm

I have HRC velocity stacks and it looks like this.

All tiny

Why ?

stimpy · Post by **stimpy** » Thu Apr 16, 2009 12:48 am

internally the carbs will be different on the last of the nc29s,hence the short stacks
hrc stacks need an hrc airbox and carb mods to work properly
stimpy

firebeast · Post by **firebeast** » Thu Apr 16, 2009 10:28 am

the later one also produces less power.btw,i am not saying the short ones wont work,just it is probably best for normal road use.track use would be shorts.

PARUS · Post by **PARUS** » Thu Apr 16, 2009 10:40 am

firebeast wrote:the later one also produces less power.btw,i am not saying the short ones wont work,just it is probably best for normal road use.track use would be shorts.

I'm not planning to fit HRC velocity stacks. Maybe in future when I'll like to convert bike just for track only or buy HRC airbox and etc. What I like to show they made all this HRC stacks short. I suggest due to performance on high speed.

Post by **tanuki** » Fri Apr 17, 2009 2:13 pm

PARUS wrote:I have HRC velocity stacks and it looks like this.

All tiny

Why ?

I have no idea but you need to sell me those....

velocity stacks?

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