stroker

[avistar23]

I am posting here because i cant find a straight answer, long story short im changing from my 7 bolt to 6 bolt because of crank walk i am tired of changing my thrust bearings and its time to move on from the 7 bolt. I am going to be stroking my 6 bolt but i cannot figure out if it will be necessary to remove the balance shafts or not. i would like to keep them in the motor because i have no method of getting the motor balanced locally and to ship it to the USA to be balanced would cost far too much, the motor will be built by me at my house. I have read in some places that the balance shaft will hit the rods and other place so no it will not. Does anyone have a straight answer?

 

[Supa Dexta]

You're just building a time bomb if you aren't going to balance your motor. Balance shafts aren't a shortcut to not doing things properly.

 

[SlickGSX]

I have not heard of a stroker motor rod making contact with the balance shafts, I do know that you will have to clearance the block by the #3 cylinder and grind down the bridges on the mains/girdle.
http://www.dsmtuners.com/forums/stroker-tech/246078-i-got-4g64-crank-what-else-do-i-need.html

 

[avistar23]

i saw that post but i just wanted to be certain.

supa dextra: its not about not doing something properly or not. its not fesible to buy a balanced stroker from the states and have it imported i do not have that type of cash.

 

[SlickGSX]

There are many guys on this site who have built their own motors without having a machine shop balance their rotating assemblies, piston and rod manufactures package sets that are within a few grams of each other.

 

[avistar23]

well thats fine then i have no looked completely into what kits are available and what i will use, i just wanted to be sure of weather or not i will have an interference issue.

 

[Clutch GSX]

Crank balancing is completely overrated. While the motor is moving there is no balance in the motor at all. Different pistons are flying up and down with different pressures behind them etc. Plus stock cranks are pretty balanced anyways. There are a few reasons to balance them but its not that big of a deal.

 

[TunaTalon]

The decision to keep the balance shafts or not should have no effect on the decision to have the engine components balanced. The design of the balance shafts assumes that the engine is perfectly balanced and compensate only for second order harmonic vibrations.

If you use light weight pistons and rods the imbalance forces from the stroker will be about the same as the stock engine. See Figure 19 on page 23 of my StrokeOrNot document ( http://www.kidzuku.com/StrokeOrNot.pdf) for more on the forces involved.

 

[avistar23]

Thanks allot for the reply, i saw that article some time ago and found it on my computer last night, it is the best set of information i have found on the subject

thanks alot!