Balancing question ????

[SNOWBUM101]

So im gonna send my engine to trygstad for him to go through and replace my crank, and some porting and what not, talking to them i ask if i should also do the perks spin balance on my clutch and mag???because what i saw looked lageit!! they told me that it was not worth the money and it does nothing for the engine what do you guys think is it worth the 400 bones!! to"spin balance " the clutches or just make sure my crank is balanced and good to go

 

[gus bohne]

Dave makes NO money on clutch balancing, therefore he is against it.

the crank balance on the R is off, but NO magic occurs when you have it balanced, the recut of the counterweight to a pie style shape is what changes the moment of inertia and the polar moment. that is what makes the crank work payoff.

balance the clutch,, if they will do the flywheel more power to you..

Those 2 items should be done first, the crank is low on the list. If it were on the top of the list,, the race dept would have them on hand..... they dont,


Gus

 

[SNOWBUM101]

so you say clutch balance a must !!does make sense thanks

 

[ARMYSLEDER]

so you say clutch balance a must !!does make sense thanks

Gus Bohne knows the XP's inside and out. I would do just as he says.

 

[byeatts]

So im gonna send my engine to trygstad for him to go through and replace my crank, and some porting and what not, talking to them i ask if i should also do the perks spin balance on my clutch and mag???because what i saw looked lageit!! they told me that it was not worth the money and it does nothing for the engine what do you guys think is it worth the 400 bones!! to"spin balance " the clutches or just make sure my crank is balanced and good to go

I run balanced clutches on the BB,s and they help. What perks does for 400 bones is balance the whole motor ,Thats Clutch ,Flywheel and the crank/pistons all as one unit.This is called" Blueprinting a motor", They spin it and like all Doos they vibrate terribly , When hes done it spins with no shake/movement. You will get a motor that will free up HP and last.When you BB a motor the crank counter weight/piston weight relationship is now altered.Even in stock form they are way out.Think about it.There is a relationship with the vibration that all Doo,s do and the short crank life.Each and every motor part has an accumulation of errors in respect to weight/balancing.Start with a trued new crank-assembly motor without the head and ship her to perks.I will be monitoring the newly built SHR ported /Engine tech 880 head which is done this way, I check runnout often and will post results.

 

[winter brew]

I just had Perks do my primary....quick turn around and he does good work. Noticably less vib at idle and it can't help but add to clutch, belt and engine life.

 

[lost]

I just had Perks do my primary....quick turn around and he does good work. Noticably less vib at idle and it can't help but add to clutch, belt and engine life.

What was the cost to having your clutch balanced?

 

[gus bohne]

The downfall to balancing a pressed together crank is you have to take it apart to do the job.. Now the press fits are weaker .

Crank rebalancing has always scared me from the ones Ive seen first hand that never stay true.. get re done get keyed get glued get welded GET a new crank !!!

If Perk can do it wthout teardown he has a new method I am not aware of..

Just driiling the counterweights for tungsten is a huge chore,,, those are hardened ( case ) and do not drill,, they kill carbide and diamond bits for fun !!
When I was wth Land and sea we did them for the outboards,, lots of sweat and drillbits

its a lot of work for sure..

Keep us posted on the 880 man,, Im vry interested in new methods.


Gus

 

[byeatts]

The downfall to balancing a pressed together crank is you have to take it apart to do the job.. Now the press fits are weaker .

Crank rebalancing has always scared me from the ones Ive seen first hand that never stay true.. get re done get keyed get glued get welded GET a new crank !!!

If Perk can do it wthout teardown he has a new method I am not aware of..

Just driiling the counterweights for tungsten is a huge chore,,, those are hardened ( case ) and do not drill,, they kill carbide and diamond bits for fun !!
When I was wth Land and sea we did them for the outboards,, lots of sweat and drillbits

its a lot of work for sure..

Keep us posted on the 880 man,, Im vry interested in new methods.


Gus

Cost to balance clutch only is 50 Bones plus ship. Perks stock 800 If I recall its a 09 .He claims 13 MPH top speed gains with the Blueprinted motor.we all know it has to free up HP.how much as has not been seen yet on the hill.However we throw 400 bucks into Motor mods without a worry to grab one foot on a highmark,It really dosnt matter how strong your sled runs as long as its stronger than your buddy,s!

 

[Hardass]

If your interested just go to perks spin balance and see what he's doing.

 

[SNOWBUM101]

Thanks guys I'm going to differently send my clutch to perks and get it done and balanced. I 'am pretty sure that my crank is ok only 1500 miles on it just that my hands fall asleep 5 min into the ride every day and so i was thinking i need my crank trued up (if thats what they call it) dont know? but any way that is why i was thinking trygstad because he has a complete rebuild kit for the 800r includes BRP rebuilt cranks shaft, customs pistons, all new bearings and gaskets, isoflex grease, diamond hone cyl,and assembled for $1,150.00 big ones! so my Q is do i still need to do the rebuild kit or just new top end and spin balance or just do both and have a new motor that should be good to go for 10,000 miles lol

 

[byeatts]

Thanks guys I'm going to differently send my clutch to perks and get it done and balanced. I 'am pretty sure that my crank is ok only 1500 miles on it just that my hands fall asleep 5 min into the ride every day and so i was thinking i need my crank trued up (if thats what they call it) dont know? but any way that is why i was thinking trygstad because he has a complete rebuild kit for the 800r includes BRP rebuilt cranks shaft, customs pistons, all new bearings and gaskets, isoflex grease, diamond hone cyl,and assembled for $1,150.00 big ones! so my Q is do i still need to do the rebuild kit or just new top end and spin balance or just do both and have a new motor that should be good to go for 10,000 miles lol

guys only get 2000 to 2500 miles on the stock crank for mountain conditions. If your is vibrating that much have the run-out checked,You might be closer than you think for bottom end.This is the short crank life I described.

 

[winter brew]

Snowbum, start with checking PTO runout....if it's excessive then you have your answer. If it's good then you get by a while longer if you choose.

 

[diamonddave]

I would also be checking motor mounts...have found a few with broken mounts with less than 1,500 miles. They vibrated alot less after I installed new mounts.

 

[i'llDooit]

is it perks.com???????? sounds like a belt cooling device?!!!! is there any recomendation of adding a floating secondary?,,,, or is the floating secondary not needed with the propper setup?

 

[mil81]

Subscribed

 

[revx827]

is it perks.com???????? sounds like a belt cooling device?!!!! is there any recomendation of adding a floating secondary?,,,, or is the floating secondary not needed with the propper setup?

http://www.perksbalance.com/
Depending on how far off the alignment is will decide if floating the secondary will be needed. I see them off 2-5mm usually.

 

[byeatts]

http://www.perksbalance.com/
Depending on how far off the alignment is will decide if floating the secondary will be needed. I see them off 2-5mm usually.

It always helps to float.A no brainer especially when the stupid shaft is not connected to the Clutch,A clutch is a service part and needs pulled down inspected /cleaned. Dumbest idea ever." Perks spin balance.com"

 

[BBP]

So if all of these cranks are out of balance, what part of the crank is the heavy side, the rod side or the counter balance side? Could you just grind a little off the heavy side & if so, how much? Lighter piston, heavier piston? Does a big bore make it better or worse?

 

[gus bohne]

crank balancing is NOT like tire, clutch or wheel. you are NOT looking for an even mass .

Their are 4 planes of motion to address and putting more or less force on any plane will alter the shake moment in that plane. sleds need like to use a vertical shake to prevent any added clutch missalignment.

letting the engine move in the veritcal plane ( up down ) is hard on mounts and chassis but easier on center to center pull and push.

thats just tid bit, there is much more to a balanced rotating assy than that..

Gus