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bump

 

dont mill your head, especial when you plan on running bigger cams... Once that material is gone theres no way f ever getting it back... There are better ways to make compression IMO...

1. Reduce combustion chamber volume by welding the combustion chambers...

Heres an example...

This is a somewhat cloverleafed combustion chamber...



Here is more of a squared chamber...



2. High compression flat faced valves...



Hig compression valves generally rais compression about .2 which might not see like alot but in combination with a few other things in efforts to raise compression this may be what your looking for...Some times this may be a last ditch effort to gain compression due to the fact that the flat faced valves weigh slightly more than a dished valve... Its not enough weight to make a difference IMO, especialy when you consider the weight that is going to be saved by switching over to aftermarket valve train anyway...

3. Thinner head gasket...



Not my favorite aproach but it does the trick... Youll be minumizing clearancexs via the thinner gasket but youll generally be gaining anwhere from .4-.6 in compression...

Ive seen a lot of guys just run oem gaskets - layer/s or of course you have the option of an aftermarket gasket...

Hope this helps

 

Which method is better? Cloverleafed style or square? pros and cons? Who would do this kind of work?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Matgallis &raquo;</TD></TR><TR><TD CLASS="quote">Which method is better? Cloverleafed style or square? pros and cons? Who would do this kind of work?</TD></TR></TABLE>

I would like to know this as well.

 

ah yea I dug this one up while trying to find info on type s pistons. Still no answer yet though

 

for stock or aftermarket standard dome the squared chamber will be a bit better on street aplications due to the fact that the original combustion chamber shape/design was patterned around the OEM piston. By squaring it off (top/bottom) your still maintaining most of the original shape of the combustion chamber while gaining compression by minumizing cc volume...

Cloverleafing has been known to work well on standard dome pistons as well... Ive also heard of a few going as far as having molds of the new chambers poored to have a custom piston made that is designed specifically for the cloverleafed shaped chamber... Paulis Le of AEBS swares by this method...

I will be running a cloverleafed head for each of my up coming builds... 2.2 OEM block, 2.3 OEM block, 2331cc custom block and 2364cc custom block...

Its a great way to make compression with out sacrificing efficient flame travel on the higher domes that sit atop most of the high compression pistons available on the market today...

 

So this would be bad on a stock type-s piston set up? too hot from compression?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Matgallis &raquo;</TD></TR><TR><TD CLASS="quote">So this would be bad on a stock type-s piston set up? too hot from compression?</TD></TR></TABLE>

Im not sure if I understand your question...

:::shrugs:::

 

me either I'm an idiot.