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Turbo Tel

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Delaware, USA

27th Aug, 2008 at 09:16:01pm

To help answer some questions can those that use Mega pistons post the engine details..

eg mine is

Compression= 9.0-1 (+20 standard head-11cc dish 4.1cc deck)
Boost=8psi
Intercooler=no/yes
max advance=30/25 degree
purchased=Jan 2007/June 2007
Terry

Edited by Turbo Tel on 18th Nov, 2008.

website:- http://www.terryhunt.co.uk


Turbo Tel

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Delaware, USA

27th Aug, 2008 at 09:16:32pm

Omega's as well?? would make a nice comparison.

website:- http://www.terryhunt.co.uk


Turbo Phil

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

Lake District

27th Aug, 2008 at 10:25:22pm

Out of interest Tel, how are you getting 8.8-1 compression on a stock chambered head & only 11cc pistons ? Is there are big piston crown to block deck height, to lower the compression ?

Phil. :)

WWW.TURBO-MINI.COM


Turbo Tel

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Delaware, USA

27th Aug, 2008 at 10:26:38pm

No I screwed up!! its 9:0 to 1

11cc dish but the Megas have a lower crown height... gives 3 cc extra..

The +40 turbo pistons sold now also have the lower crown height and have 9cc dishes.

Edited by Turbo Tel on 27th Aug, 2008.

website:- http://www.terryhunt.co.uk


turbodave16v
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***16***

SouthPark, Colorado

28th Aug, 2008 at 01:22:40pm

My Engine is 8.6CR. Circa 16psi, occasional 18psi. Running Megas with no failures.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Turbo Tel

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Delaware, USA

29th Aug, 2008 at 06:09:21pm




On 28th Aug, 2008 TurboDave said:
My Engine is 8.6CR. Circa 16psi, occasional 18psi. Running Megas with no failures.



When did you buy them Dave??

website:- http://www.terryhunt.co.uk


turbodave16v
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SouthPark, Colorado

29th Aug, 2008 at 06:18:20pm

I bought them because I was informed they are modelled on the AE turbo piston (which they certainly appear to be) and are easilly as robust, if not more so due to more modern materials / manufacturing.

I've also had mine machined to 'greater than' 15cc without issue.

I am not sure why some work, and some don't. All I do know is I'm running Zetec under-crown cooling jets, that will add stability to a highly-stressed piston than running without oil spray cooling.

Incidentally - I also believe Carl runs Cast Megas in the Don - with reliability given the HP output and RPM used - AGAIN - he is running under-crown cooling.

Maybe this is a key to the sparadic failure puzzle that hasn't yet been considered?



On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



turbodave16v
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10980 Posts
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***16***

SouthPark, Colorado

29th Aug, 2008 at 06:19:21pm

oops, you asked me when, not why!

Hmmm, Must have been April 2004 at a guess.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Turbo Tel

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Delaware, USA

29th Aug, 2008 at 06:24:49pm




On 29th Aug, 2008 TurboDave said:
oops, you asked me when, not why!

Hmmm, Must have been April 2004 at a guess.


Enjoyed both answers!! And I felt the same 2 years ago when I decided on them.. wonder when Carl bought his ones??

I was wondering if nowadays we are running higher Comps asd more relying on Mj to retard and its not enough..

website:- http://www.terryhunt.co.uk


turbodave16v
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SouthPark, Colorado

29th Aug, 2008 at 06:28:32pm

Well, I've been using DTA long before I was using megas...

I think the oil spray is more where you should be focussing - at least in regards to some working and others not working.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY


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