racin-type wrote:I think the reason Unorthodox underdrives the crank is to get the max weight loss where it counts. I think my stock crank pulley was like 6.5lbs or so. Unorthodox Racing's crank pulley weights in at 1lbs 9.2oz. Did you say yours was gonna weight around 3lbs?!
So you are underdriving the accessories? That means they will be bigger in size correct? Won't that weight increase just offset the weight loss from your crank?
Also have you done testing of the underdriven alternator's percentage (15%) to see what voltage the charging system will be at, at idle? And since you're underdriving your accessories pulleys, that means people that already have Unorthodox cranks can't use your accessories if they only wanted those, because it would be super underdrive their belt system.
Can you explain more about this "rotational stability to assist in dampering/balancing?. Whats dampering? And couldn't the pulleys be balanced no matter the size?
You still haven't posted a picture of some type of aluminum cnc'd product to show your machine work.
Thanks, I am really interested in your set but would like more info.
You CAN underdrive the crank pulley, however doing so removes minimal mass, you CAN remove the same if not more mass from a stock diameter as well. however, when you underdrive the power side (crank pulley) the diameter gets smaller and that is it.It has nothing to do with mass...but some companies that make dampers ( harmonic balancers/crank pulley) say that there is crankshaft vibrations that the damper compensates for, that lightweight crankshaft pulleys can't compensate for. This IS TRUE, however in our race experience we have seen no problems associated with the pulley sets.By NOT underdriving the crankshaft pulley there is more mass towards the outside circumference of the pulley(like a tightrope walker with the long extending pole to assist in a easier/ more accurate balancing.Doing so allows for less wiggle/vibrations in the crankshaft pulley, inturn it takes away from the vibrations of the crankshaft so it will make it easier on the crankshaft.
Pulleys can be balanced in any way shape or form, however, with the statement above on dampering...By placing weight as far away from the rotational center of the pulley it allows for more balancing WITHOUT more mass added. Honestly this is a problem/situation that all manufacturers of lightweight pulley sets DO NOT consider, hence the harmonic balancer industry hates on pulley sets.
We are pioneers in anything that we do here at STiLL RACiNG, just wait until you hear of some of the other stuff in the works! It'll blow your mind.
As for the pics....They will be up by wednesday, our prototypes are still on their way to us, and they are sending me on a trip to NYC for biz. So I'll be posting again by wednesday.
Also with the prior statement of dampering....By underdriving the accessories, it adds diameter to the pulley, not neccessarily adding weight. Its all in how you engineer the part... And because there will be no real weight added it WON'T compensate out for crankshaft weight loss. It will be a straight across the board loss of rotational mass with good balancing/dampering still.
And this is being sold as a set, so I would suggest selling the crank pulley if you want a set, but some people might want to super-underdrive their system anyways...
As for the alternator, I set a good number on that one, we have an electronics engineer here too, and basically we have shot for a good balance.
As for the 3 lb statement...I had stated that as a HIGHEND approximation. It will be much lighter than that.
I hope this answers your question.
