954-want more compression-?how much? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

User Tag List

 
LinkBack Thread Tools
post #1 of 5 Old 04-25-2004, 12:20 PM Thread Starter
 
Join Date: 12-15-2003
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
954-want more compression-?how much?

I purchased a spare 03 cylinder head with 1500 miles of use.
I want to shave the head for more compression.
My question is, how much can I shave to get a full point in compression and will I have a valve clearance problem?
I think I will be fine moving up 1 point but any ideas from others may save me some time and money.

Thanks :
Paul Armstrong is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 04-25-2004, 4:35 PM
 
CBRBob's Avatar
 
Join Date: 07-29-2003
Location: Central NJ
Age: 52
Posts: 1,524
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 18
 
Re: 954-want more compression-?how much?

I believe Dan Kyle reccomended shaving .013 off but really didn't see enough difference to make it worth dropping the engine.

CBR Bob
TeamPromotion Coach#29TPM
Rider Ed. of N.J. Inc. Senior RiderCoachRENJ
CBRBob is offline  
post #3 of 5 Old 04-25-2004, 9:31 PM
 
Jungleboy's Avatar
 
Join Date: 03-02-2003
Location: Sydney, Australia
Age: 44
Posts: 998
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 18
   
Re: 954-want more compression-?how much?

I did some rough calcualtions a little whille back and worked out that machining 0.4mm of the head would raise the compression ratio to a little over 12.5:1 although as I didnt have the exact measurement of the chambers Its only a ballpark figure if you can cc the chambers I could work it out exactly for you, if you can set the head up to be level (use a good spirit level) and use alcohol or similar to cc the chambers (you will need to coat the valve seats with petroleum jelly as the alcohol will quickly disapear! I think the chambers would be between 18-22cc (just a guess) Anyway if you feel like doing this I will calculate how much needs to be machined off.

2004 1000RR Racebike

www.jungleboyracing.com
Jungleboy is offline  
Sponsored Links
Advertisement
 
post #4 of 5 Old 04-25-2004, 11:22 PM
 
Join Date: 08-28-2001
Posts: 3,203
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
       
Re: 954-want more compression-?how much?

I don't know if you can take enought off the head to raise it that much with the stock pistons, the valves are going to get real close to the pistons. Probaly would need hi compression pistons.
G-Force Junkie is offline  
post #5 of 5 Old 04-26-2004, 12:07 AM
 
Jungleboy's Avatar
 
Join Date: 03-02-2003
Location: Sydney, Australia
Age: 44
Posts: 998
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 18
   
Re: 954-want more compression-?how much?

yeah Good point G-Force, Im not really sure how much clearence there is there? I think there would be enough just going off a few other modded 954's Ive seen that had around about 12.5:1 with std pistons and larger cams, But that would definately be something that would need a closer look once you had it apart!

2004 1000RR Racebike

www.jungleboyracing.com

Last edited by Jungleboy; 04-26-2004 at 12:14 AM.
Jungleboy is offline  
Reply

  Lower Navigation
Go Back   Honda Motorcycles - FireBlades.org > Honda Motorcycle Models > Honda FireBlade

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Motorcycles - FireBlades.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
A valid e-mail address is REQUIRED. You will not have access to any site features until you activate your account using the activation e-mail that is sent to this address.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
929 or 954?  Should have kept... larddog954 Honda FireBlade 48 01-05-2017 6:00 PM
954 vs. New '04 R1 Mako Honda FireBlade 18 07-16-2005 1:11 PM
CBR1000RR vs 954 dilema StuUK Honda FireBlade 4 04-20-2004 7:42 AM
A 954 frame on a 929? Paul Honda FireBlade 3 03-15-2004 12:59 PM
954 shock for 929?, other "better" OEM? 2bitsamile Honda FireBlade 2 12-01-2003 7:36 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome