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jamestar

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489 Posts
Member #: 9159
Senior Member

Devon

3rd Nov, 2011 at 09:45:32pm

bought myself a cheap 998 block +40, pocketed, 11 stud, nitrided crank, with pistons and rods.
i'm wandering if it's going to be cheaper for me to turbo it instead of my 1293, so i don't have to buy a straight cut gearbox and drops cos it will be making less power?

anyways the pistons themselves are marked '21965 + 508' anyone know if these are suitable for turbo use, and any idea where i can get a set of rings from?

cheers!

wil_h

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9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

4th Nov, 2011 at 08:04:21am

I'm not 100% on what the pistons are. Try phoning minispares and asking them if they have rings for them.

Might just be easier to get some new pistons though.

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

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of 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.


Paul S

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Formerly Axel

Podland

4th Nov, 2011 at 09:02:35am

Just check that the block is +0.040".

0.508mm is 0.020"

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."

jamestar

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489 Posts
Member #: 9159
Senior Member

Devon

6th Nov, 2011 at 11:34:05am

Just checked and it is infact +40, i contacted the seller and the pistons were from before it was rebored and are +20. So looks like your right Wil i might just get some new pistons.


Also do you think its a necessity to have a straight cut box and straight cut drop gears on a turbo'd 998?
the spec being:
998 +40
8:5.1
Standard 12G940 33/29mm 28cc
SW5
GT1752

GT box
3.1 Fd
X pin diff


The story goes that i have a 1293 that was rebuilt a couple thousand miles ago, that i was going to turbo but with the power it would be making, it would need a straight cut box and drop gears.
However i don't a have a specific power target. I just want something quicker than the NA 1293, so i'm wandering wether it would be more suitable and cheaper for me to just turbo the 998.

Any advice welcome :)

Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland

6th Nov, 2011 at 01:46:41pm

Stick to no more than 12 psi boost and you should have around 100-120hp which will be fine with helical gears.

It wont be long till you want to turn up the boost though :)

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."

jamestar

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489 Posts
Member #: 9159
Senior Member

Devon

6th Nov, 2011 at 09:17:56pm


Hopefully by then i will have built the 1293, and found some money to buy a SC box! *happy*

On 6th Nov, 2011 Paul S said:
It wont be long till you want to turn up the boost though :)
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