Author |
Message |
mitcharvey Samba Member
Joined: October 24, 2004 Posts: 87 Location: lompoc, cali
|
Posted: Tue Oct 25, 2005 2:07 pm Post subject: Head cc difference |
|
|
I cc'd my heads and one came out to 51cc and the other 53cc. straight up that gives me compressions of 8.83/1 and 8.58/1. Is this gonna be bad? honestly I wouldn't put full faith in my measuring. is it ok to pretend they are both 52cc? |
|
Back to top |
|
|
veedubcrazy Samba Member
Joined: February 14, 2005 Posts: 2130 Location: La Porte, Tx.
|
Posted: Tue Oct 25, 2005 2:17 pm Post subject: |
|
|
man, measure it again twice. i would want mine to all be he same. thats a .25 diff in comp ratio. alot in my book. _________________ 1967 Deluxe Sedan |
|
Back to top |
|
|
mitcharvey Samba Member
Joined: October 24, 2004 Posts: 87 Location: lompoc, cali
|
Posted: Tue Oct 25, 2005 4:07 pm Post subject: |
|
|
wow, for real? I didn't actually think it would matter.
I checked it twice again (more carefully) and came up with almost the same thing. the head with 51cc is actually a liberal 52cc and the other head is a conservative 53cc.. what ever that means
are you sure it really matters? it just seems that there's a good margin of error between head cc's and deck height, and that good round numbers are just ideal. but I honestly wouldn't know... |
|
Back to top |
|
|
randy2 Samba Member
Joined: October 25, 2002 Posts: 220
|
Posted: Tue Oct 25, 2005 5:00 pm Post subject: |
|
|
1cc is considered acceptable for stock specs if I remember correctly.
It would be advisable to get them within at least the stock spec's if not better. _________________ After reading some of these forum questions / answers I would enjoy watching some of these people work on there car!!!!!!!! ( I could use a good laugh ) |
|
Back to top |
|
|
60sunroof Samba Member
Joined: November 16, 2003 Posts: 345 Location: INDY
|
Posted: Tue Oct 25, 2005 6:00 pm Post subject: |
|
|
I would machine the other to 51.
I ran into the same problem and corrected it. |
|
Back to top |
|
|
Blaubus Samba Member
Joined: October 25, 2003 Posts: 5153
|
Posted: Wed Oct 26, 2005 5:07 am Post subject: |
|
|
matters big time. 2cc diff will make your engine run like shit. i get mine to 2/10 cc difference and it runs so even and smooth. i use a gene berg semihemi cutting tool to balance them out |
|
Back to top |
|
|
chazavw Samba Member
Joined: March 03, 2005 Posts: 472 Location: cleveland, ohio
|
Posted: Wed Oct 26, 2005 6:16 am Post subject: |
|
|
the ones that arent 53cc you can make to 53cc......
get a dremel and take out the cc that you need to take out....
what size engine is this in??
what king of heads??
what cam are you running too? |
|
Back to top |
|
|
mitcharvey Samba Member
Joined: October 24, 2004 Posts: 87 Location: lompoc, cali
|
Posted: Wed Oct 26, 2005 8:16 am Post subject: |
|
|
it will be a 1904cc
043 heads
engle 110 cam |
|
Back to top |
|
|
chazavw Samba Member
Joined: March 03, 2005 Posts: 472 Location: cleveland, ohio
|
Posted: Wed Oct 26, 2005 8:25 am Post subject: |
|
|
1904 huh....
that is 90.5 cylinders right?
the 043 heads were originally set up to handle 85.5mm cyl/pistons....
so the combustion chamber inside the head can be opened a little without affecting anything....... and get the desired 53cc that you need in all 4 to keep the c/r where you want it....
the valves are currently shrouded by the material that is left when boring the heads to make 90.5mm cyl/jugs fit in to the heads that were designed for 85.5mm cyl/jugs to fit in......
so you can open them up just a little bit to get the desired cc's........ hell maybe you can inspect each combustion chamber and see what the differences are..... it might just be a machining error.....
i personally took my 55cc head and turned it in to a 60cc head..... on my cb 044's with 40 x 35.5 valves....
look at this..... read the whole article on head porting...... over at the cal-look.com forum
tom is an awesome guy by the way........ i have personally seen him do things that will boogle your mind!!! props to tom.....
http://www.cal-look.com/index2.html
then go in to technical and then basic head porting and then to page three it shows what i am talking about.....
you will need to grind out the 2cc's that you need on the combustion chambers that arent correct. then polish/buff out the combustion chamber when you are done...... |
|
Back to top |
|
|
mitcharvey Samba Member
Joined: October 24, 2004 Posts: 87 Location: lompoc, cali
|
Posted: Wed Oct 26, 2005 7:27 pm Post subject: |
|
|
thanks for the help! great link! it turned out pretty well, i think. 53cc's on both heads now. |
|
Back to top |
|
|
|