Engine Porting

gosport86 created the topic: Engine Porting

** This thread discusses the Content article: Engine Porting **

how do you reach the egde of the port to chamfer it?
#2682

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Scott replied the topic: Re:Engine Porting

If your question pertains too the Re-chamfering after you have cut the ports shape differently ?
That I do by hand (Fingers) using first 600 grit wet/dry paper, then finished off with 1500.
Being the bore is chrome plated, all you really need to do is bevel lightly the chrome edge. A large radius like factory does prior to plated cannot be done.

Scott

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#2685

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gosport86 replied the topic: Engine Porting

a large radius like factory does prior to plated cannot be done.

what doe this mean scott? how do you know when you chamfer the egde right? thanks
#2697

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Scott replied the topic: Re:Engine Porting

If you look at the edges of the factory ports you will see a very pronounced bevel that was cut prior to the plating process. In areas that we cut doing porting mods, this bevel is completely cut away leaving a square 90* corner.

* If you run your finger across this sharp 90* corner it feels sharp. As you lightly sand this edge evenly, the sharpness you felt before will become a dull edge. If you look under strong light you can see the corner is slightly rounded. Thats is all one needs to do, eliminate the SHARP CORNERS on all ports cut upon that the piston and ring work against.

Scott

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#2705
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nikolas replied the topic: Engine Porting

after all them the horsepower it will have roughly?
#3023

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Scott replied the topic: Re:Engine Porting

nikolas wrote:

after all them the horsepower it will have roughly?


If one does the degree of work shown in the How Too article, and has done a good job at it ? .... The power with a good pipe will be very near 6HP give or take.

MANY engines built like posted race head to head with the big name tuners engines and are at NO disadvantage.

Best part is you did the engine mods yourself saving money :woohoo:

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#3028

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nikolas replied the topic: Engine Porting

thanks.
#3032

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fred replied the topic: Re:Engine Porting

Hi Scott,

I'm from Asia, this is apply to chainsaw engine?
#3885

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Scott replied the topic: Re:Engine Porting

fred wrote:

Hi Scott,

I'm from Asia, this is apply to chainsaw engine?


If you have the material around ports, then YES, mods such as this could be applied to saw engines too :cheer:

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#3888

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bahamadude replied the topic: Engine Porting

Hi scott
To reduce error, are there any measuring tools you can recommend whilst modding an engine ?
Micrometer etc ??
#4059

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