dave_s2_rst

iTrader: (2)

Evening all,

So the lovely day which all RS owners come to finally arrived. The head cam off due to the cam and a tappet being munched as suspected.

The head was removed(been on car for 3years) and noticed the pistons looking rather caked! along with the top end, is this from running rich?








Also I noticed the head had been welded as seen here:





So should I ditched the head, is this bodged? Also what are the standard inlet/exhaust port sizes?

Many thanks

Dave

studabear

Is that a zvh as my pistons didn't look like that, if it is that may be why the head has been welded

dave_s2_rst

iTrader: (2)

Yes it is a zvh,

Ah i see

studabear

I'm no expert but I'm sure I've read somewhere that when the heads been welded its to allow use of a differant headgasket, focus rs springs to mind

dave_s2_rst

iTrader: (2)

I'll have a look into that, cheers dude.

The one removed looked to be a triple layer type?

studabear

http://www.quantums.info/zvh.htm#Cylinder Head gasket

dave_s2_rst

iTrader: (2)

cheers mate

pinched this from the site

"The oil feed to the Zetec head goes closer to the edge of head than on the CVH and if you put a Zetec head gasket on a CVH head the oil just leaks out the gap. You can get the side of the CVH head built up with weld and then the head skimmed to enable you to use Zetec head gaskets."

dave_s2_rst

iTrader: (2)

Just another question, what are the normal exhaust port sizes in compared to a ported type.

Here is mine:

Rob_DOHC

iTrader: (4)

It looks like your exhaust ports have been opened up mate, they are no where near that size stock, and are flat bottomed. I've got an old thread some where showing some standard ports if you wanted a comparison.

Rob,

muz

Not sure what the pistons are, is it a 1.8 or a 2.0? What does the bore measure?

The head has been welded up to use a Zetec headgasket. Much better.

The exhaust ports are very big. They look like 39mm. Mine have been worked and are 37mm

muz

On a side note though, the valves themselves look standard, in size and material? What do they measure?

dave_s2_rst

iTrader: (2)

i'll have a check and update you guys, would be good to get info on what has been done previously.

Its a 2.0 zvh

dave_s2_rst

iTrader: (2)

inlet is 40mm

exhaust is 35mm

does that mean anything?

muz

Valve sizes? Standard valves should be 42mm inlet 37mm exhaust. I think most heads can only accept a 43mm inlet 'oversize' valve without a crosshatch head but keep the same sized exhaust valves.

dave_s2_rst

iTrader: (2)

i'll having a measure with my rule once out, sounds like they are more or less standard sized.

dave_s2_rst

iTrader: (2)

i'll having a measure with my rule once out, sounds like they are more or less standard sized.