satan_srv

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

Prelude Vtec 23

nice pics

Sticky Tires

nice & clean

Elkins911

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

Boostless97Lude

<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.......

GODluvsLUDES

<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

satan_srv

<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!

flyrod

Thanks for posting the pics

CHK4TIX

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

satan_srv

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

CBR

So this deshrouding process will lower compression, right?

satan_srv

<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.

BoostedH23a1

milling the head brings comp ratio up..

CBR

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

prelude1897

<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>

satan_srv

<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

BoostedH23a1

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

Tuney

what valves are you using?

satan_srv

<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