And everyone would know what was on his mind
What did you build this week?
- Thread starter SONICJK
- Start date
CarbsAndCylinders
Careful With That Axe Eugene
I saw through him right away.
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And he's got a memory like a sieve
SONICJK
Reminds me of...me No, I'm sure of it. I hate him
CarbsAndCylinders
Careful With That Axe Eugene
Did you do all of this yourself?
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sav0r
Coast to Coast
Thats a standard head the was welded up by my father. He gave me squish size and combustion chamber volume specs, I created a model of a combustion chamber that met those specs. I then used that model to create the program to mill the combustion chambers and spark plug holes, as well as face the head off and take care of a few other little things.
Here's the head before being machined.
Here's the head before being machined.
CarbsAndCylinders
Careful With That Axe Eugene
Impressive!Thats a standard head the was welded up by my father. He gave me squish size and combustion chamber volume specs, I created a model of a combustion chamber that met those specs. I then used that model to create the program to mill the combustion chambers and spark plug holes, as well as face the head off and take care of a few other little things.
Here's the head before being machined.
I had no idea the barrels weren’t evenly spaced on the GT750. Is it for the cam chain?
*lmao*
Seriously though, why the spacing between #2 and #3?
Primary drive is between two and three to keep the clutch tucked in and transmission centered. Kawasaki triples have the drive off the crank end and need a longer gearbox output shaft to get the chain run right. This arrangement is nice but makes the crank longer.
So to keep it as narrow as possible, the transfer ports are twisted (rotated) and that complicates things a bit more.
So to keep it as narrow as possible, the transfer ports are twisted (rotated) and that complicates things a bit more.
sav0r
Coast to Coast
I was typing a response but teazer beat me to it. Getting the dimensions worked out to do this project was a bitch. I have three heads available to me, and when you start measuring that first that becomes apparent is that they vary wildly. So I ended up scrapping all my previously put together models (hours of work) and started over just last week. To deal with this I bought a CMM plugin for my mill control and instead of measuring heads I measured the cylinder. Then I imported that data into CAD, and started again. Having the cylinder data made everything so much easier, I wish I had started this way from the get-go.
Pic of probing the bolt holes and cylinders. You can probably see that if the parts were much larger they wouldn't fit on my mill. Some days I'll get a big boy machine, today is not that day.
Pic of probing the bolt holes and cylinders. You can probably see that if the parts were much larger they wouldn't fit on my mill. Some days I'll get a big boy machine, today is not that day.
Manufacturing and casting tolerances were a bit different back in the day. I have heads that are a good match and some that are miles off. On a high compression or high performance motor it's critical to get the bores and combustion chambers matched and concentric.
kickracingmotorcycles
Been Around the Block
kickracingmotorcycles
Been Around the Block
I made this little 4 foot by 17inch work table for the shop! I originally had the bottom shelf almost to the floor but moved it up so I could slide a chair under it.
Thanks Teazer (and Savor)... makes sense now
And yea... "complicates". I was searching the GT750 heads and barrels, and noticed how the ports are basically twisted in order to give the appearance of even spacing.
Engineering is a fascinating profession
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