Head job.

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cbaker65

cbaker65

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I decided that I will use my 23cc as an experiment in trying to gain a little bit more power out
of it!
I had the head off before ,but really did not pay any attention to what it looked like inside ,an that was
quite a few years ago!
Here lately ,I been watching some of those porting an transfer timing vids ,so I went out back an looked
at a couple of cylinder heads that I had laying around ,I found one an inspected the transfer ports on it ,
an boy ,I was amazed on what I seen on it ,so just by watching a few vids showed me what to look for ,
an what I seen inside the port was a nasty carbon up oily gunk that almost had the port completely seal
shut ,that maybe the reason why that peticular item didn't get fixed ,the piston an sleeve looked new with
out no scaring ,so it visually looked fine!

When I watched the porting vids ,one person actually opened that transfer port up more by removing
some of the material ,but ,they did pull & mic measurements for port timing ,I don't have the Deg. wheel
to do so ,but I am going to try to open up the main transfer port up a little to see what type of change
will happen in the performance!

I will put up a pic of the head that I was looking at earlier here in a bit!
 
cbaker65 said:
I decided that I will use my 23cc as an experiment in trying to gain a little bit more power out
of it!
I had the head off before ,but really did not pay any attention to what it looked like inside ,an that was
quite a few years ago!
Here lately ,I been watching some of those porting an transfer timing vids ,so I went out back an looked
at a couple of cylinder heads that I had laying around ,I found one an inspected the transfer ports on it ,
an boy ,I was amazed on what I seen on it ,so just by watching a few vids showed me what to look for ,
an what I seen inside the port was a nasty carbon up oily gunk that almost had the port completely seal
shut ,that maybe the reason why that peticular item didn't get fixed ,the piston an sleeve looked new with
out no scaring ,so it visually looked fine!

When I watched the porting vids ,one person actually opened that transfer port up more by removing
some of the material ,but ,they did pull & mic measurements for port timing ,I don't have the Deg. wheel
to do so ,but I am going to try to open up the main transfer port up a little to see what type of change
will happen in the performance!

I will put up a pic of the head that I was looking at earlier here in a bit!
Click to expand...
? There's sites where you can print out a degree wheel btw ?
 
Ok ,here is some pics ,now ,this is not an RC engine ,but it has the same thing ,its parts like coil ,intake port is in a different
location is all!

Here is the piston ,it is only gunked up with no scaring ,nothing to prevent from running any way!



The head over view!






Ok ,here is the inside ,you can see in the cylinder wall where the ports come out ,they are almost sealed shut
with the oily gunky carbon!




 
cbaker65 said:
Ok ,here is some pics ,now ,this is not an RC engine ,but it has the same thing ,its parts like coil ,intake port is in a different
location is all!

Here is the piston ,it is only gunked up with no scaring ,nothing to prevent from running any way!



The head over view!




Ok ,here is the inside ,you can see in the cylinder wall where the ports come out ,they are almost sealed shut
with the oily gunky carbon!
Click to expand...
You got a big head Mr ?? what size?
 
mark35 said:
The piston has worn in that engine
Click to expand...

Yes ,this engine is one of those newer style Echo hand held leaf blowers ,a customer brought it to me to fix ,
I could not figure out why it wouldnt run ,I just told him to buy another!

I believe that it also had one of those plastic flywheels ,so with seeing that ,I told him that it was junk!...:cool:
 
mark35 said:
I meant to say piston ring??‍♂️ the carbon has past by and down the transfer ports to the case??
Click to expand...

The blower looked to be very new when the person brought it to me ,so ,maybe it could had been in
the oil or his mix is the reason why it was like that ,but when I was watching a vid ,the person talked about oils ,
they said that some oils wont burn off very good ,an some engines need to run longer period of time to burn
the oil off ,with a blower ,some folks around here only run them for a few minutes ,long enough to blow the
dust off their drive ways!...LOL
 
At half throttle, with the choke on no doubt ?. I'd skip the transfer for right now, and map out your intake and exhaust travel on the piston. See what kind of room you have to work with. Transfer timing can be a bit tricky at first. (Clean the transfers out obviously) think the rule of thumb was 70% of cylinder (usable) area for the size of the intake and exhaust ports as a start. Make sure you chamfer the edges of the ports so the ring don't get caught.
 
Seandonato73 said:
At half throttle, with the choke on no doubt ?. I'd skip the transfer for right now, and map out your intake and exhaust travel on the piston. See what kind of room you have to work with. Transfer timing can be a bit tricky at first. (Clean the transfers out obviously) think the rule of thumb was 70% of cylinder (usable) area for the size of the intake and exhaust ports as a start. Make sure you chamfer the edges of the ports so the ring don't get caught.
Click to expand...

Yea ,chaffer the edges an make sure no sharp edges & burrs?
 
I am still trying to figure out why my weed eater engine is faster than Baja engine!...FEK...:unsure:

Examined the piston ,they are the same size ,weed eater is a T260 ,but it is the same size as the
23 cc ,don't make sense ,260 skirt is about a 1/4 '' longer ,an the transfer ports are slightly different.

Transfer port on the Baja has a little wall ,the T260 head has no wall at all ,I need to inspect the timing!...:geek:
 
It's all about the porting mate. Cc doesn't = power if the porting sucks. Also think of all the different applications that 2 strokes are used in. Difference in timing, port size and shape all affect how the engine runs. Take for example your weedwacker they are made for top performance wide open. Well guess somewhere around 15k rpm. They don't really make a lot of low end, but once wound tight they are great. Now stick that same displacement in a small saw. Were not terrible worried about tons of top end power, so the porting has to be changed to make more power in the low to mid range. Here in this application were worried about being able to pull a chain through the wood. So you would favor porting for torque. Port both of them and all bets are off. The deeper skirt will affect port timing as well.
 
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