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eaton_mini

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West Sussex - dreaming of forced induction!

29th May, 2009 at 03:00:50pm

Hi Guys, what sort of bore clearance are people using with these??

Going to get my block(s) bored out on monday so need to let the guy know this figure *oh well*

Rod S

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Rural Suffolk

29th May, 2009 at 03:09:49pm

What size engine (ie, bore diameter) ???

Schrödinger's cat - so which one am I ???

eaton_mini

238 Posts
Member #: 1649
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West Sussex - dreaming of forced induction!

29th May, 2009 at 03:22:26pm

1 x 1380 (1275 +114) and 1 x 1040 (998 +120)

wil_h

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Betwix Harrogate and York

29th May, 2009 at 03:56:49pm

Standard is 2.6 to 3.6 thou piston to bore clearance.

I use 4 thou on the racer, but this means it does have a bit of blowby on the racer.

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.


Rod S

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Rural Suffolk

29th May, 2009 at 04:36:34pm

I can only speak for the 1380 (I actually used the 73mm pistions so am at 1360 but the 73mm and 73.5mm Hypatecs are the same design)

I used 0.06mm (2.4 thou) at the bottom of the skirt which is the top end of the factory spec.

Be careful with factory figures though, they are different top and bottom of the skirt (because the skirt isn't parallel on standard pistons). On the 73mm Hypatechs (at the least the ones I got) they had parallel skirts (in the load plane) most of the way up with reduced diameter ring lands and crown. Hence me quoting the bottom clearance which is the smaller one.

Schrödinger's cat - so which one am I ???

eaton_mini

238 Posts
Member #: 1649
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West Sussex - dreaming of forced induction!

29th May, 2009 at 05:41:42pm

So 2.4thou at the bottom of the skirt it is then :o)

Vegard

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Norway

29th May, 2009 at 07:07:38pm

I also use 0.06mm on my engines.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

29th May, 2009 at 07:11:14pm

do you mean 2.36 thou?

whats with this metric crap...

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

https://joe1977.imgbb.com/



eaton_mini

238 Posts
Member #: 1649
Senior Member

West Sussex - dreaming of forced induction!

29th May, 2009 at 11:35:58pm




On 29th May, 2009 mini13 said:
do you mean 2.36 thou?

whats with this metric crap...


*happy* Metros were metric werent they??!?!

Vegard

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I pick holes in everything..

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Norway

30th May, 2009 at 12:12:47am

As long as we quote piston size in metric. ie 71.12 etc, it fucking ridiculous to quote clearance in imperial.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

n.g.l.

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Chard, Somerset

30th May, 2009 at 08:03:57am

In the Ebay listing below it give the clearances for the 73mm pistons about half way down the blurb. How useful this info is though is debateable as the seller is a numpty.
http://cgi.ebay.co.uk/Mini-73mm-Pistons-Ro...%3A1%7C294%3A50
Seems a good price though.

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

30th May, 2009 at 10:07:01am

They went cheaply!

Edited by Vegard on 30th May, 2009.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

tadge44

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Buckinghamshire

30th May, 2009 at 12:17:49pm

Was that £50 ish each, or for a set ?

Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

30th May, 2009 at 01:02:04pm

71.12?

do you mean +20 thou?


On 30th May, 2009 Vegard said:
As long as we quote piston size in metric. ie 71.12 etc, it fucking ridiculous to quote clearance in imperial.

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

https://joe1977.imgbb.com/



Oli

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Wilts

30th May, 2009 at 02:29:58pm

eg. 2.8 inch lol

On 30th May, 2009 mini13 said:
71.12?

do you mean +20 thou?


On 30th May, 2009 Vegard said:
As long as we quote piston size in metric. ie 71.12 etc, it fucking ridiculous to quote clearance in imperial.

On 15th Jul, 2009 fastcarl said:
 the pissed up clown stood back up, did a twirl and left bollock naked,


Rod S

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5988 Posts
Member #: 2024
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Rural Suffolk

30th May, 2009 at 02:59:03pm

It must be the hot weather......

I can work in either units but metric is so much easier for doing calculations....

And the big Hypatecs are actually "genuine" metric sizes (73mm and 73.5mm).

Now back out in the sun everyone.....

Schrödinger's cat - so which one am I ???

Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

30th May, 2009 at 09:43:40pm

sorry,I was only joking, but i think your right Rod, all this week i've been irritating the fuck out of everyone at work for the sake of it, must be the heat...

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

https://joe1977.imgbb.com/


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