Still ms180 compression

[Tom Bullman (Tomit)]

Does The Stihl ms180 have a lower compression rate than say a ms250. Regards tom

[bmp01]

Simple answer probably about the same, no reason why the manufacturer would derate one or the other intentionally.

 

In a bit more detail,  they are both 'home owner' saws,  both "clam shell" type of engines, so with out a big amount of effort there is little you can do to improve the compression ratio. There is therefore little interest in measuring their compression unless diagnosing a sick engine.

If i were to hazard a guess id say the MS025/250 would have a slightly higher ratio - they both have the same spark plug so each has to accommodate that feature which is of a certain volume.  That will 'hurt' the ratio of the smaller engine more but it's probably insignificant. ....

 

HTH,

BMP01