redbull660
Addicted to ArboristSite
can someone photo shop me a MS991 !??!
Who's gonna pull apart a 1000 dollar unit to snap pictures of something inside the engine and void the warranty? If you say you would show me a picture
He was prolly bothered by the lack of stock finger ports. I'd be surprised if you could get a 661 for $1000I'm sure you would I probably would but I have no pictures and have never had an issue on a large 1000 dollar saw. What issues did you have on the 90cc saws?
I'm sure you would I probably would but I have no pictures and have never had an issue on a large 1000 dollar saw. What issues did you have on the 90cc saws?
well one of you experts should make a youtube video showing how to do it.
Thanks for that perspective. I guess the intake must be open just long enough enough to get the full volume of air into the case, but no longer, so that the intake closes sooner and allows the case to be pressurized. It's a balance between having a long enough duration to get the volume in vs. having enough pressure/velocity.Port shapes play a huge roll in these engines as well Hu. For instance, on many engines I will not lower the intake by grinding. I like to maintain a high case compression in a work saw, so that transfer velocity is as high as possible. That means that the time between the intake port closing, and the transfer ports opening needs to be kept constant between many models, even though transfer heights vary. Lowering the intake, and raising the transfers can kill some models. The MS461 and the MS661 both appear to be this way. In these saws, I alter the shape of the intake, rather than the height to get the time/area I'm needing.
So are you using that case compression angle as a rule of thumb, or is it more based on experience with a given type of saw/porting design?It's all about finding the sweet spot......I thought I was building some pretty stout saws two years ago, but looking back thru my notes from that time shows me how much better I understand the whole induction process now. The saws I'm doing today are in a whole different league, and when one isn't up the par (like the first attempt on this 661) I know it in the first couple of cuts.
Sheeez monkey l'm trying to buy two masterminded saws atm that are 2012 models from duromax. And now you tell us back then they are not as good. I wanna cry now! I thought buying some tidy used MMded saws was going to save me some $$$ and give me the fastest saws on the block. I'm shattered....It's all about finding the sweet spot......I thought I was building some pretty stout saws two years ago, but looking back thru my notes from that time shows me how much better I understand the whole induction process now. The saws I'm doing today are in a whole different league, and when one isn't up the par (like the first attempt on this 661) I know it in the first couple of cuts.
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