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Home > Help Needed / General Tech Chat > Max boost for 1275 Metro Turbo Pistons?

racer_pete

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Isleworth

3rd Apr, 2011 at 01:59:48pm

Hi, did search but couldent really find a straight answer,

what is the max boost i could safely run with these pistons and also what bhp could i expect?

spec is roughly -

t3 turbo
avonbar head with 27.5 chambers
ford escort series 2 intercooler
turbo dizzy
phase 2ish cam and duplex
C/R will be around the 8.7:1 mark.
s/c box etc..

thanks.

Turbo Phil

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My sister is so fit I won't show anyone her picture

Lake District

3rd Apr, 2011 at 02:11:58pm

I've personally run over 15psi on them with no probs. They're a very sturdy piston.

WWW.TURBO-MINI.COM


apbellamy

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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

3rd Apr, 2011 at 02:13:47pm

WE routinely ran 15psi in the van, and at times 20+ and they where fine. Our CR is around 8.2.

Check your CR calcs, ours is a standard block (flush to the top of the pistons) and a 28cc head and is 8.2ish

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

racer_pete

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Member #: 4826
Advanced Member

Isleworth

3rd Apr, 2011 at 05:00:22pm

wow didnt know they where capable of that much boost!, i think i have messed up my calcs too ap, should be around what yours is then, apart from i havent had the block skimmed (and sit around 1mm down the block?). what kind of power would i expect at 15psi? Im looking for around 140 - 150bhp anything around that mark i'd be happy with. Also would a orange diaphram be up to it, or should i just buy a grey?

cheers, Pete.

wil_h

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Betwix Harrogate and York

3rd Apr, 2011 at 05:03:26pm

15psi will easily achieve the bhp that you want.

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



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.


Turbo Phil

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4641 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

3rd Apr, 2011 at 05:05:44pm

If the pistons are sitting 40 thou down the bore you'll have around 4cc of volume there, but you need to measure this accurately to determine exactly how much.
The orange diaphragm will not be suitable, just stick a grey in there.

WWW.TURBO-MINI.COM


apbellamy

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16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

3rd Apr, 2011 at 05:29:09pm

Our van made 153 bananas on 14-15 psi with a fairly well ported head (valves and guides where fooked) and an mg metro cam.

Being honest, it wasn't that nice to drive at that boost level. When we dropped it to 10-12 it still went like stink but was much nicer to drive.

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*
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