jaws12r
Novice Class
Posts: 45
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posted April 09, 2006 02:09 AM
Counter balancer
Hi guys while i am building my 1375 and waiting for my ss valves to come frm APE i read some where dat rod muzzy advises not to street ride the bike after the counter balancer is removed, not good for the motor. isn't the crank for the 1375 balanced ? if so will it still be safe to run without the counter balancer pls advise thanks
  
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted April 09, 2006 02:48 AM
The primairy balance on an inline 4 crankshaft is neutral. Meaning, bob weights arnt needed to balance the crankshaft. The rods all need to weigh the same as well as the pistons etc. When it runs it will have perfect primairy balance.
However, secondary vibrations come into play. The slight relitive acceleration and deceleration of the crankshaft when the cylinders fire causes secondary harmonics in the crankshaft that can, over time increase the wear on the main bearings and can fatigue the crankshaft. On a welded crank this becomes even more important. If you took 100 welded cranks and xrayed them you would see a percentage of them have compromises under the skin. After some number of cycles these cranks will fail in time. Even a billet crank is subject to the same stresses and can fail. This is why a top fuel, or nextel cup, or F1 crankshaft will be used for x number of runs or time and will be discarded even if it still measures 100% on the money.
The counter balancer spins at twice crankshaft speed to smooth out these surges in crank speed to reduce secondairy harmonics in the crankshaft.
So on these welded cranks I would agree.
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12r1
Expert Class
Posts: 390
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posted April 09, 2006 06:56 AM
I would leave it in, and tweak a bit more power somewhere else to make up for any gains by removing it. Too much time and $$$ for me to risk a KABOOOOM!!
This coming from a guy who never even dove into a motor like that, of course....
jeff
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jaws12r
Novice Class
Posts: 45
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posted April 09, 2006 10:42 AM
okie thanks guys will keep the counter balancer in
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entropy
Moderator
Posts: 8671
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posted April 09, 2006 10:49 AM
jaws,
only a couple more weeks till i see yr project. And after that we'll let my company treat us to some fine Singapore black pepper crab and beer! WOO-HOO!!
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This moderator uses moderation in moderation
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted April 09, 2006 05:52 PM
quote:
jaws,
only a couple more weeks till i see yr project. And after that we'll let my company treat us to some fine Singapore black pepper crab and beer! WOO-HOO!!
Now that sounds GOOD!!!
I have mine out and never noticed any vibration with my balanced crank...
of course I do not street ride very much anymore....
but that is going to change this year....
MM
____________
200-MPH CLUB MEMBER!
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jaws12r
Novice Class
Posts: 45
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posted April 10, 2006 06:24 AM
quote:
jaws,
only a couple more weeks till i see yr project. And after that we'll let my company treat us to some fine Singapore black pepper crab and beer! WOO-HOO!!
Yeah and hopefully my APE valves would have arrived by then and after dat will show u the night life of Singapore after the pepper crabs !!! Remeber to give a call when u are here ya cheers !!!
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jaws12r
Novice Class
Posts: 45
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posted April 10, 2006 06:32 AM
quote:
quote:
jaws,
only a couple more weeks till i see yr project. And after that we'll let my company treat us to some fine Singapore black pepper crab and beer! WOO-HOO!!
Now that sounds GOOD!!!
I have mine out and never noticed any vibration with my balanced crank...
of course I do not street ride very much anymore....
but that is going to change this year....
MM
Hi mike i need a set of ur Cam degree timing kit Can u let mi know the cost for sending a set over to Singapore thanks
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TRNorBRN6001
Needs a job
Posts: 2021
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posted April 10, 2006 08:11 AM
Entropy, ya best be getting rid of that stroker crank cause its got way
too many cycles on it. It might let go at any time! I'll take it off ya nice and
cheap though so ya don't have to risk it anymore.
____________
TFA 200MPH CLUB MEMBER!
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megabyte
Pro
Posts: 1047
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posted April 10, 2006 07:43 PM
My 1361 was smoother than stock @ low RPMs, especially around 4000.
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We First make our habits and then our habits make us.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted April 11, 2006 02:00 AM
Yea i'd have to say the 1375 is very smooth. Less vibration in some areas, but a little more in the feet at certain areas. I havent really payed that much attention to it to say what rpm I feal it in the feet.
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jaws12r
Novice Class
Posts: 45
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posted April 11, 2006 05:58 AM
really can't wait to start riding my 1375
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted April 11, 2006 09:06 AM
did ya get my email?
thanks...
if not try this
madmike1209@mchsi.com
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200-MPH CLUB MEMBER!
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jaws12r
Novice Class
Posts: 45
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posted April 14, 2006 06:47 AM
quote:
did ya get my email?
thanks...
if not try this
madmike1209@mchsi.com
Hi sorry mike i did not receive ur e-mail but i just sent u a e-mail  awaiting ur reply cheers
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