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Author Topic: stihl 048 piston  (Read 301 times)

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Offline Cut4fun .

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stihl 048 piston
« on: October 09, 2014, 07:00:00 pm »
Rob says this is a west coast piston mod done on a stihl 048. 

He says the top of the piston has been cut down in in 3 spots, v-shaped if you look close.

Any info on this?


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Offline farmboy

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Re: stihl 048 piston
« Reply #1 on: October 09, 2014, 10:57:05 pm »
Way out of my league. 
Shep
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Offline aclarke

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Re: stihl 048 piston
« Reply #2 on: October 10, 2014, 12:58:53 am »
Kev,  looks like the exhaust and transfer timing has been altered by cutting the piston crown down.  Works and can be a good way to experiment with timing changes on a piston which is a lot less costly than a cylinder. In my experience, .100 of an inch of material remaining over the ring land is absolute minimum.
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Offline Cut4fun .

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Re: stihl 048 piston
« Reply #3 on: October 10, 2014, 06:43:49 am »
Quote from: aclarke on October 10, 2014, 12:58:53 am
Kev,  looks like the exhaust and transfer timing has been altered by cutting the piston crown down.  Works and can be a good way to experiment with timing changes on a piston which is a lot less costly than a cylinder. In my experience, .100 of an inch of material remaining over the ring land is absolute minimum.

Thats what I was thinking transfers and exhaust timing change. But pic was so bad I couldnt make out what was happening for sure.
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Offline aclarke

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Re: stihl 048 piston
« Reply #4 on: October 10, 2014, 09:07:16 am »
Pretty fuzzy pic.  You can trim the skirt on the intake side for timing changes too. 
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