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Oli

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Wilts

16th Jul, 2009 at 12:38:19pm

On 16th Jul, 2009 Rod S said:
The bore walls for example, if you believe Vizard, whilst they may not fail, the amount they will distort and flex can actually reduce power.


Thats a good point, i never thought about power loss through bore flex. Common sense really lol.

What wall thickness have you got between cylinders 2 and 3?

Don't minispares now sell 73mm pistons? I take it they have a slot instead of hole?

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


hughesmarkie

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16th Jul, 2009 at 12:45:07pm

Just my tuppence worth as I have owned/own both types of car wht you are looking into, both a n/a 1430 fully built stonker with 136bananas on the rollers and I currently own a 1293turbo (and in the middle of building a 1380 turbo but thats taking forever*happy* )

IMO for big power and reliability go turbo, the 1430 was no where near the power/torque I get from my turbos,yes you could just hit 100mph in third but to drive it was a pig in comparison, with such a cammy engine it was purely suited to track sessions, I love cammy engines butI think for the money and potential power one word? Turbo!!! *smiley*

Mark

Oli

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Wilts

16th Jul, 2009 at 12:54:02pm

You've hit the nail on the head there Mark... Depends what you want it for.

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


Oli

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Wilts

16th Jul, 2009 at 12:54:03pm

EDIT - Double post

Edited by Oli on 16th Jul, 2009.

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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16th Jul, 2009 at 01:10:13pm

On 16th Jul, 2009 Oli said:
On 16th Jul, 2009 Rod S said:
The bore walls for example, if you believe Vizard, whilst they may not fail, the amount they will distort and flex can actually reduce power.


Thats a good point, i never thought about power loss through bore flex. Common sense really lol.

What wall thickness have you got between cylinders 2 and 3?

Don't minispares now sell 73mm pistons? I take it they have a slot instead of hole?


I achieved 3.75mm between 2 - 3 with 3.95mm between 1 - 2 and 3 - 4

That was by using a VERY good old skool machine shop (Scholar in Suffolk).

The gasket fit was here,





Although this actual gasket has never been used - one of the dodgy Belgium ones.

As for the 73mm pistons, I think it was Vegard who has said MiniSpares are now selling the Hypatec ones, although presumably at a higher price than you can import them from Oz..... :)

EDIT - I should add, those photos were a trial fit with the Hypatecs with their standard dish, before I machined them out to 14cc (there is another thread on the machining).

Edited by Rod S on 16th Jul, 2009.

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

Oli

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Wilts

16th Jul, 2009 at 01:24:11pm

Thats a surprising amount of mental left between the bores. Good work there Rod!

Thats given me food for thought.

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


AWDmoke

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16th Jul, 2009 at 02:59:30pm

James,

I am impressed with my 1430 It's an absolutely awesome road car, and manages fairly well on track too. Love it !!!

Realistically, it could never manage the performance of a well built turbo motor, and the extra safety margin of not having to offset bore or have a stroker crank would give a slightly overbore turbo motor the advantage in reliability too in a track application.

On 24th Dec, 2008 Nic said:
 eyh? im drubj but very confused##]#IU

John

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Mongo

Barnsley, South Flatcapshire

16th Jul, 2009 at 03:09:58pm

Rod S.

Any chance of the measurements you used to get your block machined like that?

Perhaps something I could provide a machine shop with?

If something is worth doing, it's worth doing half of.

miniswordsman

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Pueblo, Colorado, USA

16th Jul, 2009 at 03:39:55pm

Hmm... I think I'll go with a 1293cc then... I'm looking for the best of both worlds, and if the 1430 would not be good fore turbo then I'll not use it. Or maybe contemplate it later, after I've run a turbo on a large bore for awhile. Thanks for all your input guys!

-James

Rod S

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16th Jul, 2009 at 03:42:17pm

mmmm ??? (MiniMadMotorMan)

Here's a scan of the actual piece of paper I gave to Scholar (Rendalsham, Suffolk) and the "expected" measurments are exactly what I got back.


It's basically what Visard recommends for 73.5mm and 74mm blocks, but after accuarately measuring my own block (the top figures) and measuring the gasket, I decided it was worth it for 73mm too.

But measure your actual block first....

If you want a high res image, PM me your real email address.

Rod.

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

John

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Mongo

Barnsley, South Flatcapshire

16th Jul, 2009 at 03:45:14pm

Thanks Rod. I understand I would have to measure my own block but think it would be worth it for head gasket longevity on a 73.5mm bore.

If something is worth doing, it's worth doing half of.

Oli

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Wilts

16th Jul, 2009 at 03:55:45pm

I've looked at bored and standard blocks before, measured and compared them. And i realised that there is a great deal of difference.

But only now i have seen that diagram, it has hit me, and i realise the extent of how the wall thickness is greatly reduced.

Thanks for posting that up Rod!

Edited by Oli on 16th Jul, 2009.

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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16th Jul, 2009 at 04:05:07pm

The ironic thing is that because Scholar's are so "Old Skool" they insisted on the measurments being in imperial as well as metric....

And although I am seriously old, I don't use imperial !!!!!

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

rubicon

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LONDONSHIRE

13th Feb, 2011 at 11:14:36pm

Rod where could i get a set of decent 1430 pistons?

On 2nd Oct, 2009 Vegard said:

On 1st Oct, 2009 Jimster said:
I bet my first wank came quicker than your first mini turbo


These new modern turbos with their quick spool up time, would make the competition harder.


On 15th Aug, 2011 robert said:
phew!!! thank you brett for smashing in my back doors .( not something i imagined writing... EVER)

danrock101

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Nottingham

13th Feb, 2011 at 11:29:27pm




On 13th Feb, 2011 rubicon said:
Rod where could i get a set of decent 1430 pistons?

Do you mean 73.5mm pistons to use with a stroked crank? To make 1430? Because to make that capacity with a standard stroke crank you need triumph pistons iirc 74.7mm


rubicon

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LONDONSHIRE

14th Feb, 2011 at 10:12:00pm

sorry thats what i meant, 74.7's
got a block with some nice steel caps ,
just need something to fill the holes...

On 2nd Oct, 2009 Vegard said:

On 1st Oct, 2009 Jimster said:
I bet my first wank came quicker than your first mini turbo


These new modern turbos with their quick spool up time, would make the competition harder.


On 15th Aug, 2011 robert said:
phew!!! thank you brett for smashing in my back doors .( not something i imagined writing... EVER)

John

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Mongo

Barnsley, South Flatcapshire

15th Feb, 2011 at 08:37:53am

You bought the KAD block off ebay then?

Keep your eye out for a set of triumph pistons.

Out of interest the caps would be able to be used on another block but you would have to mill about 20thou of the bottoms of each for them to be line bored again.

If something is worth doing, it's worth doing half of.

Sprocket

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Preston On The Brook

15th Feb, 2011 at 11:22:24am

I had a set of Triumph standard six pistons. I threw them away, as they were far from performance items, but I have seen some Hepolite 'PIP' pistons for that engine, so all is not lost.

Also worth trying to find out what engine the Powermax 1380 pistons are actually from since they come on 'STD' and '0.51' (73.5 and 74mm respectively) Surely they would also do a '+1.00)?

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

rubicon

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LONDONSHIRE

15th Feb, 2011 at 10:18:02pm

i did john, well i thought i did,
turns out they wanted more than the £134 i bid,they are asking £200 for it,they forgot to put a reserve on,
nevermid
just something else for me to spend money on...lol

On 2nd Oct, 2009 Vegard said:

On 1st Oct, 2009 Jimster said:
I bet my first wank came quicker than your first mini turbo


These new modern turbos with their quick spool up time, would make the competition harder.


On 15th Aug, 2011 robert said:
phew!!! thank you brett for smashing in my back doors .( not something i imagined writing... EVER)

John

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Mongo

Barnsley, South Flatcapshire

15th Feb, 2011 at 10:33:43pm

ebay rules they should give it to you for the selling price.

If something is worth doing, it's worth doing half of.

rubicon

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I like granny porn.

LONDONSHIRE

15th Feb, 2011 at 10:52:25pm


tbh,
it would have just sat in my lounge for the next year or so....lol
would have been worth it for the caps though....

On 15th Feb, 2011 John said:
ebay rules they should give it to you for the selling price.

On 2nd Oct, 2009 Vegard said:

On 1st Oct, 2009 Jimster said:
I bet my first wank came quicker than your first mini turbo


These new modern turbos with their quick spool up time, would make the competition harder.


On 15th Aug, 2011 robert said:
phew!!! thank you brett for smashing in my back doors .( not something i imagined writing... EVER)
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