Clam shell porting?

[merc_man]

Was wodering if clam shell motors are any good for porting. Would most of the gains come from the muffler mod?
What all else could ya do other then widen the ports since ya cant really deck them.

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[Jimmy in NC]

Was wodering if clam shell motors are any good for porting. Would most of the gains come from the muffler mod?
What all else could ya do other then widen the ports since ya cant really deck them.

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Yes... its considered a standard woods port. Lots of gains by shaping and blending.

 

[fearofpavement]

I rarely do any porting on a clamshell. When I have, I just widen the ports a bit and clean things up. I am not really sure how much "gain" there is as I haven't done any timed cuts or other than the "I think it feels stronger" which may be wishful thinking, lol. I mainly work on the 1127 series Stihls and they get significant gains from just a muffler mod.

 

[Mastermind]

Adding a little intake timing and widening the ports adds more than you might think......well worth doing. Be sure to try advancing the timing some too.

 

[merc_man]

I been wanting to try porting again since i did the husquvara 353. Whitch saw should i try my echo cs 510 or ms 250.
The echo i already did a muff mod and it seemed to help it.

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[Mastermind]

I don't know much about the 510.

 

[Dub11]

I port clams on the daily

 

[Chainsaw Jim]

I port clams on the daily

I bet a roll of tp lasts a couple weeks at your place.

 

[Red97]

I don't know much about the 510.

510 Should be pretty much the same thing...

 

[merc_man]

I don't know much about the 510.

Oops 520 not 510.
Dam little numbers on phone.

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[merc_man]

I port clams on the daily

Now youve gone and made it a dirty thread lol.

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[Dub11]

All joking aside I was about ready to do some grinding on some ms390 heads bit sent them off to @Black Dog Chainsaw so he can test that new pop up.

 

[sawfun]

Chainsaw Jim has a 180 Stihl that will spank hard a couple of good 200t's. I have a MMWS Husky 36 that would surprise a few folks.

 

[Keith Gandy]

Thoso ringends get mighty close on the transfers

 

[drf256]

Just a bigger PITA to port a Clammy. Adjusting squish very difficult.

 

[Czed]

All joking aside I was about ready to do some grinding on some ms390 heads bit sent them off to @Black Dog Chainsaw so he can test that new pop up.

I've done several 017 018 290 310 390 stihls very happy with the result just widening and blending the ports advanced the timing well worth it.

 

[JT78]

I have a ported 142 clamshell there are still nice gains to be had from a little widening and some small timing changes.

 

[Al Smith]

I did some work on a 2.8 cubic inch Poulan/Craftsman.It did improve it .It needs seals which I've yet to get around to changing .

 

[Czed]

Once you get used to the stihl clams they are easy i was surprised at the gains haven't done any husky or echo clams yet.

 

[Chainsaw Jim]

I'd definitely say you can get good gains from a clam shell....