Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Crank balance 3 cyl

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
silver_notch138
New Member
New Member
Posts: 25
Joined: Sat Jan 02, 2010 10:50 pm
Location:

Crank balance 3 cyl

Post by silver_notch138 »

Hi all, I have 3cyl Yamaha 998 turbo snowmobile crank and assembly that needs balanced for cp pistons and rods.
Anyone have experience with these cranks? I’m curious on reciprocating %. That have a counter balance shaft in the engine as well.
Thanks
User avatar
Baprace
HotPass
HotPass
Posts: 1728
Joined: Sun Aug 06, 2006 4:57 am
Location: Henrietta NY 14623

Re: Crank balance 3 cyl

Post by Baprace »

silver_notch138 wrote: Wed Jan 13, 2021 11:11 am Hi all, I have 3cyl Yamaha 998 turbo snowmobile crank and assembly that needs balanced for cp pistons and rods.
Anyone have experience with these cranks? I’m curious on reciprocating %. That have a counter balance shaft in the engine as well.
Thanks
Silver_notch138 , I have a Hines balance specification program and it specifies 3 cyl Yamaha engines to use 50% recip and 100% rotating values. There is no reference to balance shaft engines. Not sure if this number is still valid. PHONE: (734) 769-2300. [-o<

I don't have any experiance with balancing a ( Turbo assembly ) but I figure the piston weight may be lighter than the actual weight because of turbo/blower psi pressure on the piston, better call them and ask their recommendation with the turbo, please post their reply if you can.
TSN
HotPass
HotPass
Posts: 4
Joined: Sun Oct 08, 2017 1:36 pm
Location:

Re: Crank balance 3 cyl

Post by TSN »

I just balanced the same set up as you.
I used 50%

I had to add weight 15grams front and rear
Carrillo rods. CP pistons.
I didn't have the stock components to weigh
silver_notch138
New Member
New Member
Posts: 25
Joined: Sat Jan 02, 2010 10:50 pm
Location:

Re: Crank balance 3 cyl

Post by silver_notch138 »

Ok good to know. That the same components as this one. Unfortunately now that I’m into it my bob weights won’t go light enough to do it. I have a cwt machine.
TSN
HotPass
HotPass
Posts: 4
Joined: Sun Oct 08, 2017 1:36 pm
Location:

Re: Crank balance 3 cyl

Post by TSN »

I have a set of small narrow bob weights that worked
TSN
HotPass
HotPass
Posts: 4
Joined: Sun Oct 08, 2017 1:36 pm
Location:

Re: Crank balance 3 cyl

Post by TSN »

I have a smaller narrower set that worked on my machine.
Post Reply