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- Dec 24, 2015
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- Coastal Oregon
I know the builders name, DNT know him personally, I got 4 saws in that need reported or rebuilt with new cylinders, 2 others from another ported I know of by name only as well and a 460 Stihl that the owner knew was ported but not sure buy who, oddly the 460 needs a new bottom end but the top end held together well, the 460 work is very clean and I have a feeling I know who ported it by work. I was curious if anyone knew why someone would grind the uppers that way, figured maybe learn something new.
I think they’re trying to get the charge started in the right direction. But with the exhaust pressure still higher than the case pressure you can see them back feeding
There was a long-time builder here who was doing that - he claimed the higher velocity pushed the power band up by 3k, but what he really did was make a high-revving saw that had no torque. I've got several of his cylinders here and they're pretty much paper weights. They've got huge intake ports as well.