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 <nigel...@tiscali.co.uk> 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 > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to quantumowners@googlegroups.com > To unsubscribe from this group, send email to > quantumowners-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s).
