Are there any standard pistons available with cut-outs for valve clearance
which would also lower the CR as a bonus? May be a simple effective route
and minimise leakage possibilities?
Martin
----- Original Message -----
From: "Matthew Wastell" <[email protected]>
To: <[email protected]>
Cc: "Quantum Owners Group" <[email protected]>
Sent: Saturday, January 14, 2012 1:55 PM
Subject: Re: [Quantum Owners] Xtreme Zetec Turbo
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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