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Home > 998cc > using a 940 head and a decompression plate and 2 head gaskets.

booton

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has any ones used a decompression plate. any issues.

found a high quility one
http://www.ebay.co.uk/itm/Classic-Mini-Dec...5#ht_570wt_1165

could easily lower the compression and not pay over the odds for a 295 head.

just a thought.


Carl S
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Stourport-on-Severn

Have a search booton, this has been discussed lots of times before.

Cheers,
Carl.

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apbellamy

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I helped keep this site alive!

15728 Posts
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King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

de comp plates are a bodge

On 4th Apr, 2014 oli79 said:
I miss wr london *crying*

On 30th May, 2014 lee.pb said:
when pulling it in the garage.

On 11th Sep, 2014 Shauna said:
I don't really fancy blowing a hoe!


bennyy

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Doncaster, yorkshire

For the price of a de comp plate and 2 headgaskets your nearly at the price of one of the head gurus opening out your chambers, benross or turbo phill can do this.

Audi s4 b5 - 470bhp & 486ft lbs

On 15th Mar, 2012 wil_h said:

Yes, Carl says he gets requests for rimming all the time

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble *wink*


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex


On 11th Feb, 2012 bennyy said:
For the price of a de comp plate and 2 headgaskets your nearly at the price of one of the head gurus opening out your chambers, benross or turbo phill can do this.


what he said!

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

http://s95.photobucket.com/albums/l154/min...2006/?start=all



stevieturbo

2875 Posts
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Northern Ireland

Cant think of any circumstances I'd ever consider using a decompression plate.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


fastcarl

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Fastest A Series Mini in the World

leeds/wakefield.

What makes you say they are a quality item,


On 11th Feb, 2012 booton said:
has any ones used a decompression plate. any issues.

found a high quility one
http://www.ebay.co.uk/itm/Classic-Mini-Dec...5#ht_570wt_1165

could easily lower the compression and not pay over the odds for a 295 head.

just a thought.

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE


booton

23 Posts
Member #: 9792
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fair enough,
thanks for your reply's.
guess its not worth it then.

thanks for the advice.


robert

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back home in oxfordshoire.

booton ,

in case it helps , i know of two turbo mini engines running with two head gaskets ,up to 12 psi , neither suffered any problems .

i also know of a turbo min running 15 psi with water meth inj using a 1.8mm stainless spacer plate with one gasket either side . it never blew either .

editted to add ,

i completely forgot !! my own 498cc bike uses a decomp plate ,i knocked up from a sheet of 1.8mm mild steel ,been fine for 10 years on 15 psi ,135 bhp .11000rpm max .

Edited by robert on 12th Feb, 2012.

620 kg ,old falkens ,open diff.13.1s @109.1mph . (wheelspin from mid track)
88mph to 112mph in 4.39s.highest 1/4 terminal 112.1mph


wil_h

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Betwix Harrogate and York

I think a decomp plate is a bit of a bodge, but there are several reasons where there is a god argument to use on.

One important point if you do decide to use one. The link you have is for a small bore. If you are using a 12G940 you need a largbore plate and largebore head gaskets.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Alex

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Woolavington, Zummerzet

Some years ago a friend obtained a development A-Series head from the back door of the factory that was totally flat - no combustion chambers at all. To get a sensble compression ratio he had to run a decomp plate and was forever blowing gaskets.
One quick chat with the metallurgists at work later, he had another plate made up out of cast iron - and never blew another gasket.

All the commercially available plates I've seen are made of aluminium, which has a dramatically different expansion ratio to cast iron - best guess was that the plate tears the gaskets during warm up/cool down.

Metric is for people who can't do fractions.

Home > 998cc > using a 940 head and a decompression plate and 2 head gaskets.
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