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Rick.SPI

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Thrapston, Kettering, Northants NN14

has anyone on here used the decompression plates (the sort u get with supercharger kits) aswell as low comp pistons and head in order to run mega boost.

im not planning on doing this i just wondered whilst at work bored today whether any1 uses them on turboed motors.

if not why?

is there only so low on compression you want to go?

cheers *smiley*

Edited by Rick.SPI on 9th Feb, 2010.

On 17th Feb, 2011 apbellamy said:
I popped my first one out the other day...


AlexF2003

5795 Posts
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AFRacing LTD

Newbury, Berks

beacuse you can grind the head out and get below 7:1 with 14cc pistons if super low comp is your bag :)

AlexF


Rick.SPI

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Thrapston, Kettering, Northants NN14

so basically its just cheating?

On 17th Feb, 2011 apbellamy said:
I popped my first one out the other day...


Paul S

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Formerly Axel

Podland

It's a bodge.

The only people to have tried it have largely regretted it.

A search would reveal a number of posts about the subject.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


robert

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uranus



On 9th Feb, 2010 Rick.SPI said:
has anyone on here used the decompression plates (the sort u get with supercharger kits) aswell as low comp pistons and head in order to run mega boost.

im not planning on doing this i just wondered whilst at work bored today whether any1 uses them on turboed motors.

if not why?

is there only so low on compression you want to go?

cheers *smiley*



yes rick ,i built a decompression plate for my turbo 500 twin bike ,running it between two of the original gaskets ,i made 135 bhp on 15 psi ,its run this way for 7 years with no problems .
i ran 2 head gaskets on my mini for a while .up to 10 psi 150 bhp no problems .
my friend john still runs 2 head gaskets with no probs at 8 psi .

the audi rs2 runs a 2.3 litre at 325 bhp approx ,and uses a steel decomp plate ..as standard .

thats about all i have on it .:)

oh i tell a lie ,the fiat 16v headed a series i built had a 1.5mm decompression plate ,9ran for all of 5 minutes lol),also ,a engine i had a hand in in the 80's had a 1.7mm stainlesss decomp plate on a suck through setup ..running 15 psi and methanol injection ,it never blew a head gasket.

Edited by robert on 9th Feb, 2010.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM


Paul S

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Formerly Axel

Podland

There is always an exception to a rule, usually robert *happy*

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


evolotion

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Glasgow, Scotland

dont run an alloy decomp plate :) mine fucked right up, stainless one was ok :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.


Rick.SPI

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1596 Posts
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Thrapston, Kettering, Northants NN14

ah... mixed views lol :)

i dont plan on using one really but is nice to know. cheers for all the info so far *wink*

On 17th Feb, 2011 apbellamy said:
I popped my first one out the other day...


BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

YES! its a band ade for not doing it right.

the gaskets blow and or .... the decompression plate lets go under the slightest touch of detonation

you need to lower the CR in the head chambers and or ..... chose the the correct piston dish a combination of the two will get the job done correctley






lockfast

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Aberdeen

I didt it as a trial for my engine with the supercharger before I went grinding the head etc. It worked ok but on srtipping the engine it had been blowing between cylinders 2 and 3. If you want one I can sell you one he he


Rick.SPI

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1596 Posts
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Thrapston, Kettering, Northants NN14

im alright thanks, i wanna spend the money and get my engine right and proper haha :)

On 17th Feb, 2011 apbellamy said:
I popped my first one out the other day...


8PortChris

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Advanced Member

Cumbria

I ran one , and never had any problems

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