Got some head pics from Top Power Racing. The Pics show deshrouding of the valves, a technique that allows for better breathing in the head. Maybe someone has some good links to info on deshrouding, but it's a good power making technique, good for high lift/duration cams






To quote Dirtylude, "All deshrouding really means is cutting away the little skirt area that comes on the head around the valves and taking away some material around where the valves meet the edge of the chamber. On a stock head the top of the chamber would be perfectly circular, on those above you can see where they've cut out some material around the valves. I assume you're running larger then 87mm pistons. Since the bore will be bigger you have more room to cut out material around this edge of the valves, which is what they did. "

I am running 89mm pistons, so from the pics you can see how the valves now sort of 'stick out' of the 87mm chamber bore, they have been deshrouded to the full 89mm Now this is a power maker

 

nice pics

 

nice & clean

 

damn... sometimes i wish my feet looked as good as your engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Elkins911 &raquo;</TD></TR><TR><TD CLASS="quote">damn... sometimes i wish my feet looked as good as your engine.</TD></TR></TABLE>
um.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Elkins911 &raquo;</TD></TR><TR><TD CLASS="quote">damn... sometimes i wish my feet looked as good as your engine.</TD></TR></TABLE>

Toenail clippers and tinactin tends to help fyi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Elkins911 &raquo;</TD></TR><TR><TD CLASS="quote">damn... sometimes i wish my feet looked as good as your engine.</TD></TR></TABLE>

eww!

 

Thanks for posting the pics

 

that looks great, the only problem i can see is that i dont have enough money to get it done to mine.

 

well on a stock head you would only see gains mildly dessrouding..nothing crazy like this..

 

So this deshrouding process will lower compression, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChurchBoyRacer &raquo;</TD></TR><TR><TD CLASS="quote">So this deshrouding process will lower compression, right?</TD></TR></TABLE>

well it would have, had we not milled the head a little to get it back.

This isn't a TON of material, but yes if you did nothing it would lower compression.

 

milling the head brings comp ratio up..

 

Is there a rule of thumb to how much you can mill off a cylinder head before it becomes useless?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Prelude Vtec 23 &raquo;</TD></TR><TR><TD CLASS="quote">nice pics </TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChurchBoyRacer &raquo;</TD></TR><TR><TD CLASS="quote">Is there a rule of thumb to how much you can mill off a cylinder head before it becomes useless? </TD></TR></TABLE>

I haven't heard of anyone going over 30 thousandths

 

my roomates was 60 thousandths over...
thats gude for yea

 

what valves are you using?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tuney &raquo;</TD></TR><TR><TD CLASS="quote">what valves are you using?</TD></TR></TABLE>

stock