First time porting

[merc_man]

gonna try my first shot at porting. Whats a good start. I dont plan on changing timing would like to keep it simple. (For now)
I know it would be a little advance for me but wanna put a degree wheel on to get a better understanding of your numbers you guys talk about and what they mean.



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[merc_man]

Oh ya forgot to mention i decided to try on the husky 353

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[lwhaples]

Maybe start with gasket delete and a muffler mod?

 

[merc_man]

Heres a pic of the port shapes

First is exhaust second is intake.

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[merc_man]

Pic of cylinder bore measurement

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[merc_man]

Trying to figure my max width i could go on exhaust port. If bore is 1.774 i multiply it by 0.70 and get 1.2418.

So 1.2418 should be my max 70 percent. This dont mean i gotta try and go this wide.

The pic shows the stock port opening with a line on either side to show my max i could open it to.

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[tree monkey]

I shoot for 65% on work saws, 70% on race saws, if I can give it good shape and the skirt is wide enough

 

[merc_man]

I shoot for 65% on work saws, 70% on race saws, if I can give it good shape and the skirt is wide enough

How do you determine if skirt is wide enough. if skirt not wide enough do you go by a percentage of the skirt

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[tree monkey]

461 piston, you can see the scribe line of the port. I like to have .050 overlap on the side for a work saw. .020 for a race saw

 

[Mastermind]

I thought I was the only one that used a scribe to make a mark on the piston. Can't see that little scratch hurting a thing........and it's easy to see.

 

[merc_man]

Sorry for the dumb question and hope reusing your pic was ok.

So you measure 50 though from the straight part of piston(virticle edge) for work saw.

And also good to know a scribe will not hurt i used a pencil.

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[tree monkey]

I also mark the port on my sanding mandrel, here you can see how much I changed the exhaust port

 

[merc_man]

View attachment 13217

I also mark the port on my sanding mandrel, here you can see how much I changed the exhaust port

That mandrel must be upside down?
Do you try to draw a line on inside of cylinder so you know where to grind to?

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[tree monkey]

Sorry for the dumb question and hope reusing your pic was ok.

So you measure 50 though from the straight part of piston(virticle edge) for work saw.

And also good to know a scribe will not hurt i used a pencil.

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from the scribe line to the edge of the piston skirt, or 65% on a full circle piston

 

[merc_man]

Is mine what you consider a full circle piston

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[tree monkey]

i'll make a video and post it latter today on how I do this

 

[tree monkey]

Is mine what you consider a full circle piston

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yes

 

[merc_man]

ausome thanks cant wait to see it.

 

[merc_man]

that top ring on your piston, would the ring end be a problem. just curious if it would be too close to the edge of port opening and be a snag issue.

 

[merc_man]

Thought i would try to draw on paper what i plan to try and see what you all think.

I traced the port on paper and drew out about 64ish percent cylinder bore. Let me know what ya think of the shape. Would this work?

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