Filmed in April, 2022.
I had done a fair amount of saw testing on a couple of the ms400s over the last month or so. Small variations of the zippkit tweaking process. I was curious to see how the magnesium piston was going to hold up.
One of the "phases" of testing was 4 different am air filters. So in that session there are 5 runs. The trouble with this log is that it is riddled with knots. It is therefore hard to get an accurate (fair) determination. I plan on reevaluating at some point.
The 400 seen here has been tweaked 3 times. The initial zippkit, then 2 slight changes as I was easing into the "Mag" Slug concept. What we see here is a 400 in Psy-Ko S trim.
The pun on the meteorological conditions was to address the fact that the 5ooi was run when the air was much cooler the evening before. Cool air is more dense generally speaking. Water vapor plays a part in the density as well. More dense air gives better performance to an internal combustion engine.
I cannot say enough about the transformation of the "little turkey" as is seen here besting Stihl®s "golden boy" saw.
Looking at the displacement numbers and how they are derived:
ms400 has a piston swept volume of 66.8cc - 50mm bore x 34mm stroke.
ms500i has a slug swept volume of 79.2cc - 54mm bore x 34.6mm stroke.
Looking at the Stihl® factory rated hp (where hp is relative):
ms400 is 5.4 bhp.
ms500i is 6.8 bhp.
Looking at the timed runs:
4oo @14,040 302R tach & 14,100 edt-9 tach went 10.88 down and 10.88 up.
5oo @ 13,380 with the edt-9 went 12.41 down, 11.29 up, and 10.95 up.
Do I even need to discuss the chain stall...
In the end, a saw down on displacement by 12.4cc was running a little better than the current boy wonder in the saw world. The 400 wins against the 500i again.
I was becoming more well pleased with te 400 the further along I went with the SawShop MakeOver process.
At the time of your viewing this, I may, or may not, be immediately available for custom saw modifications. I am booked out several months regularly. If you are interested in having a saw zipped, please shoot me an email. That is the best, first point of contact.
danger_cat@rocketmail.com
Thanks for watching.
12 сен 2024
