I was kinda curious... cylinder heads are cast... I've welded plenty of cast before... but my question is...

if one did weld the chambers to lower CC's .. I heard that even if you weld away from the seats, you'd have to change them. is this true? how about the guides?

because if you had to change all the seats and guides, that would be costly for such a mod ?

so the question is.. MUST you change the seats if you weld. if not is there a specific distance one has to be far from ?

since heads are pretty beafy. would it warp?

 

Because headgasket and valve sealing is sensitive to small variations it is much safer to replace or remachine the valve seats and check the head to ensure it remained flat after welding. The real question is...why do this? adding material to the head can negatively affect airflow around the valves, cause hot spots etc. If you're after increased compression, why not use higher compression pistons, mill the head, or use a thinner headgasket?

 

I've got an RSX-S head that mishifted and broke a couple seats (one chamber) ... so i have to weld a chamber so when the head is warmed up it's easy enough to add meterial to the quench pads in the other chambers.. to increase the CC's..

the head is an RSX-S... ti's kinda rare, and because of IVTEC you can't really mill that much, because then you'll need to get custom pistons for the valve releifs, i'm allready running cams that I had to limit the VTC advance... the issue is it's computer controlled so I had to machine a stopper, so I wouldn't have valve to piston collision.

for the price of a headgasket and "free welding etc" i'd be game to try..

just kinda curious on past experiences....

basically for about 100$ i can increase the C/R a half point to a full point, I can't do that normally under a 900$...

idea's...


example see how the quench pads were welded. ?




compard to this one





Modified by HotWheelz at 11:34 AM 1/3/2006

 

dude that 'welded' head is a GSR head, they are the only ones with that area filled in

 

i just used those pics as reference... i knew it's a GSR head... here how about another view or what i'm looking at..



there.. with a bit of searching found it... i noticed he punched the guides out, and replaced all the seats, after it was welded.... so i may have found my answer.. just looking for others. out there ?

 

pm MAX_CFM.......he'll let you know

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HotWheelz &raquo;</TD></TR><TR><TD CLASS="quote">i just used those pics as reference... i knew it's a GSR head... here how about another view or what i'm looking at..



there.. with a bit of searching found it... i noticed he punched the guides out, and replaced all the seats, after it was welded.... so i may have found my answer.. just looking for others. out there ?</TD></TR></TABLE>

Why not ask the guy whom you stole that photo from?

 

if you look closely, i didn't "STEAL" it... I simply advertized by stating it's link where he publicly allowed others to view the info.

i may do that.

 

I have welded them a few times and the people didn't change the seats.But if it was me I sure would.Because when you get close to the seat when your welding it ,It pulls away from the seat.Even if you peen it or center punch it.Also when you weld on an alum. head don't heat it up.And use helium or helium mix.So the head doesn't get to hot.When alum. gets over 600degs it loses its heat treat.And goes dead soft.
Here is a B16 head that was milled about as far as you can go

]



Modified by RMF at 8:37 AM 1/5/2006


Modified by RMF at 8:41 AM 1/5/2006

 

haha, look at ya, showing off your dual port head to see if anyone notices!

 

haha **** i didnt see the dual ports till u mentioned it

 

Well I'll be ,That is that head isn't it Tony? LOL . That Tony 1.Nothing gets passed him.

 

i was thinking...wtf? I didn't know hondas had two ports?!??! they must have ported those out when I looked at all of the heads in the shops in ptown. lol.