• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Lapping

Jethro

Jethro

Forum Sage
Past Site Supporter
TGSR Superstar
Charter Member
Now, I know my dog makes this sound when drinking out of the toilet, but in respect to my Suzuki- what the heck does lapping the valves mean?
 
It is a process during a rebuild A small amount of grinding compound is put on the valve and the valve is rotated back and forth to get the best seal possible against the valve seat
 
Lapping the valves seems like religion. You'll never convince me that you need to do this if a proper valve job has been done. I have never heard of high end racers doing it. As a matter of fact, some of the articles I've read that were written by the likes of Keith Black specifically went out of their way to say they DON'T do it.

To each his own I guess. I look at it as 'shade tree'.
 
Lapping is not really worth the trouble. First the compond can get into the valve guide causing trouble. Second the process of lapping the valves flattens out the seats on both the valave and the valve seat. There is supposed to be a .5 to 1 degree difference between the two to enable the carbon build-up to be chipped away with the movement of the valve. The chipping action is also helped along with the sharpness of the edges on the ground edges. lapping rounds out these edges.
To be able to propely lap valves you still have to take the head completely apart. While the head is apart to the point that you can lap the valves, you might as well just pay some one with the correct tools to grind the valves and seats. If you are trying to save some money, you could take the head and the valves to the machist after you have disassembled and cleaned everything. Most machist will do a simple grind for less money than if they have to disassemble clean and then reassmble the head.
Now, that I am registered with this site I wuill try to help out on the techinical questions. If for some reason that someone wants my input and I have not responed then please e-mail me.
I have worked in the past as a ASE certified master machinist and master mechainic. I have worked on just about any type of motor and/or engine. I also have an extensive backround in the electronic industry.
 
You must log in or register to reply here.

Similar threads

crazyramen
Low Compression in 3 Cylinders 100 Miles After Rebuild
Replies
16
Views
338
rphillips
R
tlg1100
Coffee withdrawals
Replies
19
Views
321
Nessism
Nessism
crazyramen
Question on Points Ignition - maxxed out?
Replies
7
Views
225
crazyramen
crazyramen
F
Engine Knock
Replies
19
Views
350
DimitriT
DimitriT
adam83
Shifter feels weak when going into 1st. Sometimes wont catch, other times it's fine.
Replies
2
Views
129
adam83
adam83
Back
Top