Lapped my head

MrLarkins · #11 (**permalink**) 06-29-2008, 08:55 AM

Quote:

Originally Posted by jasonh

shaving a wee bit off the bottom of the head will make your combustion chamber a little bit smaller, thus increasing the compression of the motor. This will give you a little more power, and a little more efficiency.

Plus, making sure it is flat and true will help reduce head gasket leaks.

i must be seeing that wrong in my head...but it seems to me that removing material would make the chamber larger and thus have lower compression...

Pablo · #12 (**permalink**) 06-29-2008, 09:08 AM

The material being removed is coming from the sealing surface of the head, not inside the head, so the chamber gets smaller.

Skyliner70cc · #13 (**permalink**) 06-29-2008, 02:47 PM

Pablo,
I hope to heck it was the head bolts and not the bottom of the threaded head stud that backed out and loosened your head. This is a very common problem which is why I JB weld or red locktite the bottom headstud threads into the block.

MrLarkins · #14 (**permalink**) 06-29-2008, 02:56 PM

oh, the part where the scratch was...i got it (visually) now.

jasonh · #15 (**permalink**) 06-29-2008, 05:10 PM

Quote:

Originally Posted by Skyliner70cc

Pablo,
I hope to heck it was the head bolts and not the bottom of the threaded head stud that backed out and loosened your head. This is a very common problem which is why I JB weld or red locktite the bottom headstud threads into the block.

I'd hate to see what happens when you have a JB Welded stud snap off in the block...

A properly sized and torqued quality stud should not back out.

Pablo · #16 (**permalink**) 06-29-2008, 06:50 PM

The loosening is normal (I guess) with these heads and new Al gaskets. After about 3 cycles of heat-cooling-retorquing the torque holds. I'm betting there are a lot of folks who need their head nuts torqued.