The head gasket was a Focus RS gasket, these are multipart steel shim
type gaskets and good for lots of power, also available in several
thickness.
I had problems on my ZVH with Felpro gaskets failing between cylinders
about once a year, change the the Focus RS one and no problems since.
Jim
On 14/01/2012 13:55, Matthew Wastell wrote:
Hi,
Honestly I've no idea about what is the best material. I saw an article in some
kit car about a tiger with a decomp plate and tracked the guy down. Asked him
what he did and then did the same basically.
Ferriday aluminium decomp plate with one later metal head gasket on the block
side and a bit of blue hylamar on the head side.
This was actually planned to do this way but we did a full forged piston route
instead. That don't last and the decomp plate was an emergency plan Along with
a 100k+ auto mondeo Zyrtec engine, (I had the decomp sat on a shelf already and
the complete mondy was almost free) to get me to Ireland in time for the
owners trip.
Supposedly standard valve springs are good for one bar max boost so unless you
change them 2.5mm is no trouble. I'm over boosting to 1.1 bar before the
controller brings it back to .9 with no issues so far (apart from keeping it in
a straight line)
So I can only say aluminium worked for me for around 10k of punishing miles.
Matthew
On 14 Jan 2012, at 09:27, nigelp<[email protected]> wrote:
The engine's coming out for gearbox overhaul, new clutch and drilling
the oil return for the turbo into the block, probably like Jim's ZVH
conversion. Manged to win a bid for a Garrett turbo from an SX200
last night and have started laying out the manifold plate on CAD and
will then CNC machine the plate at work.. Question is I need to get a
blanking plate to lower the compression on the head. Does anyone know
if the profile is the same for silver top and black top 2L engines?
I am going the decompression plate route, certainly for this initial
stage, I haven't yet run the calcs on plate thickness required, buit I
notice a web site where someone has used 2.5mm and I think Matthew
said his was 2 mm ah just checked Matthews was 2.5mm, so may as well
do the same. Anyone any idea what material is best for the plate, I
notice Ferriday use aluminium and another company I talked to at the
Autosport show yesterday used stainless. I can see arguments for and
against both, so Matthew do you remember what material yours was?
Thanks, Nigel
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