Stock head volume?
- Thread starter Tommyz125
- Start date
This is just from memory, but I believe it is 25-28cc and milled under 23cc will knock.
Now that i have put that out there someone will correct me for sure.
With the head rechambered you can get the volume down to about 18cc and still run pump fuel.
The nice thing is you do not have to run it that close to the wire.
Anything in the 20-22cc range will make great power, going even smaller is very little gain.
Now that i have put that out there someone will correct me for sure.
With the head rechambered you can get the volume down to about 18cc and still run pump fuel.
The nice thing is you do not have to run it that close to the wire.
Anything in the 20-22cc range will make great power, going even smaller is very little gain.
ken says its 22cc
but i dont know
there is threads on here but i cant find them right know.
http://www.kenoconnorracing.com/Blaster Cylinder Head.html
but i dont know
there is threads on here but i cant find them right know.
http://www.kenoconnorracing.com/Blaster Cylinder Head.html
Ken is dialed in on the CC's being 22CC's.
I just measured four (4) stock heads and they vary a bit by castings (castings Y1, Y2) and I came up with between 22.3CC's and 22.8CC's. Its a casting, so it can vary quite a bit. I imagine that I will find a few more in the future that are either a bit smaller in volume, or a bit larger in volume. The important thing is to be sure the head's spark plug threads are in good shape and that it has no broken fins. When you purchase a used head to re-chamber, this gives you a little bit of bargaining power. That's because the combustion chamber can be so screwed up and mangled, it doesn't matter, because ALL of that mess gets cut away when its machined. So, if you happen to see a "or best offer" on ebay, you know what to do.
I just measured four (4) stock heads and they vary a bit by castings (castings Y1, Y2) and I came up with between 22.3CC's and 22.8CC's. Its a casting, so it can vary quite a bit. I imagine that I will find a few more in the future that are either a bit smaller in volume, or a bit larger in volume. The important thing is to be sure the head's spark plug threads are in good shape and that it has no broken fins. When you purchase a used head to re-chamber, this gives you a little bit of bargaining power. That's because the combustion chamber can be so screwed up and mangled, it doesn't matter, because ALL of that mess gets cut away when its machined. So, if you happen to see a "or best offer" on ebay, you know what to do.
yeah i wanted to say above there was probably a . point after that
and i had 3 in mind but i do remember seeing it wrote on here
and i had 3 in mind but i do remember seeing it wrote on here
So Joe the head that you have rechambered for me is 1cc smaller , its not much , does it raise te static compression compared to stock?
Its negligible. Its the combustion chamber shape, squish band width, and squish clearance that does the work. Have you tried it out yet? When you assembled the top end did you install new rings with a fresh hone? That will jump compression! With the porting that your doing, that head will work great!
Yeah i have
I hav'nt tried it yet but soon as possible, rings ,piston and bore are fresh. There are still honing marks and i have measured ring gap that are in specs. 125psi sith stock head. Have you ever done an stock vs moded head swap on the same engine to compare power?
"Have you ever done an stock vs moded head swap on the same engine to compare power?"
Yes I have, and what a difference! Especially when the jetting is perfect.
No worries!
I did this to my ported engine on my personal blaster. The difference is very apparent. You won't be disappointed.
Yes I have, and what a difference! Especially when the jetting is perfect.
No worries!
I did this to my ported engine on my personal blaster. The difference is very apparent. You won't be disappointed.
it is not the cc you should be worried about
if you want ''17cc'' then you will need RACE GAS
I DONT WANT TO SPEAK FOR @OConnor Racing
but i think and dont hold me to this his head mod
is the same cc as a stock head...........
stop worrying about it
your stock compression will be ''Much more with this head mod''
''and hp.''.....
i bet ken will have summin to say about this tomorrow cuz i just
TAGGED him in this post
FINISH your project and tell us what you think
no need to over analyze this he he
if you want ''17cc'' then you will need RACE GAS
I DONT WANT TO SPEAK FOR @OConnor Racing
but i think and dont hold me to this his head mod
is the same cc as a stock head...........
stop worrying about it
your stock compression will be ''Much more with this head mod''
''and hp.''.....
i bet ken will have summin to say about this tomorrow cuz i just
TAGGED him in this post
FINISH your project and tell us what you think
no need to over analyze this he he
More efficent burning lead to more pressure. I think I begin to understand.it is not the cc you should be worried about
if you want ''17cc'' then you will need RACE GAS
I DONT WANT TO SPEAK FOR @OConnor Racing
but i think and dont hold me to this his head mod
is the same cc as a stock head...........
stop worrying about it
your stock compression will be ''Much more with this head mod''
''and hp.''.....
i bet ken will have summin to say about this tomorrow cuz i just
TAGGED him in this post
FINISH your project and tell us what you think
no need to over analyze this he he
also joe cut this for you........
have some faith in the craftsmanship of your 4 fathers
he he
its just a bunch of guessing for you just finish it off and be WOWED
have some faith in the craftsmanship of your 4 fathers
he he
its just a bunch of guessing for you just finish it off and be WOWED
AMEN!also joe cut this for you........
have some faith in the craftsmanship of your 4 fathers
he he
its just a bunch of guessing for you just finish it off and be WOWED
I tested between a stock head and a re-chambered head on a ported and piped blaster engine that had the transfer ports "matched" to the case, running a stock mikuni VM26 carb, no lid on the air box, Uni filter, correct jetting, and factory oil injection system. I remember saying "Wow!" each time I hit the throttle with the re-chambered head. I then swapped back to the stock head and re-tested to make sure I wasn't fooling myself, and then swapped it back to the re-chambered head. there was no fooling, it makes a big difference.
