Spuds Porting and Tuning Thread

[Acg128]

HI STEVE will a ported 461 on a 20" bar see off a 650 on a 20" bar thanks jon

 

Yeah JON!! Spud will sort you out. Thanks mate

[spudulike]

Yeah JON!! Spud will sort you out. Thanks mate

 

I also believe that in a fight, a grizzly bear will see off a wolf:thumbup:

[wyk]

Wolves VS Bears!

 

https://www.youtube.com/watch?v=08kObcEjtfc

 

AH yeahhh.

[spudulike]

Been porting a MS460 this weekend, standard figures off the degree wheel are: -

 

Exhaust Duration - 160*

Inlet duration - 142*

Blowdown - 23.5*

 

Now the figure that stands out is the blowdown so set out to maintain the exhaust duration, increase the inlet duration to 150* and reduce the blowdown figure to around 18*

 

The final figues were 160* exhaust, 150* inlet and 18.5* blowdown, the muffler was opened up as was the internal baffle plates, the ports were widened and the base gasket was reduced to 0.12mm.

 

The saw now picks up pretty fast and sounds pretty good.

[spudulike]

Well, it has been pissing it down all day, I have had in mind to go back to my 346XP and 357XP to lok at some of the earliest portig I did and check out if it could be improved.

 

From the pile of aluminium powder left on the bench at the end of the day - it was obvious my technique has changed a fair bit. The ports shape has squared up, the blending in of the internal port to external port has improved and I leveled up the transfers on the 357 as the piston crown was showing decent blowdown on one side only.

 

Will see how they go in time.

[div_h]

So you where holding back on my saw? was using it on Saturday and it's stop on:thumbup:

[spudulike]

So you where holding back on my saw? was using it on Saturday and it's stop on:thumbup:

 

My one was the first one I ever ported - yours was done quite recently so benefits from a few years experience:thumbup:

[Stubby]

My one was the first one I ever ported - yours was done quite recently so benefits from a few years experience:thumbup:

 

Will mine need a " refresh " Steve ? Mine was early I think .....

[spudulike]

Will mine need a " refresh " Steve ? Mine was early I think .....

 

Don't know what sort of difference I will get on mine, probably not worth doing as I remember trying yours and it pulled pretty well from what I remember - think I had a vid somewhere....here it is:thumbup:

[Stubby]

Don't know what sort of difference I will get on mine, probably not worth doing as I remember trying yours and it pulled pretty well from what I remember - think I had a vid somewhere....here it is:thumbup:

 

It still as good as ever Steve ! Just kidding mate .