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PostPosted: Wed Nov 28, 2018 7:47 pm 
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Joined: Sat Aug 20, 2016 10:07 pm
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Car Model: 99 EMS 1976
Hi,

I am looking for some new pistons for my 1977 99 EMS. It has the AB pistons fitted and it is the 2 litre B series engine. NOS ideally but would consider some in good used condition.

Cheers

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77 99 EMS (Charcoal Grey Metallic)
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PostPosted: Wed Nov 28, 2018 10:51 pm 
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Joined: Mon Jan 16, 2006 5:48 pm
Posts: 250
I have some 8.7:1 compression ratio. 0.25mm oversize. Made by Mahle. They are NOS still in the box


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PostPosted: Sat Dec 01, 2018 4:50 pm 
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Light Pressure Turbo
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Joined: Sat Mar 03, 2007 12:34 am
Posts: 515
Location: Haverfordwest, Pembrokeshire, West Wales
Car Model: 1974 Silver 2dr 99 EMS
The 8.7:1 compression ratio is Pre 1975 1985cc engines.

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PostPosted: Sat Dec 01, 2018 7:28 pm 
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identical to later engines , they just have a very slightly larger bowl in piston crown


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PostPosted: Sat Dec 01, 2018 11:16 pm 
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Light Pressure Turbo
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Joined: Sat Mar 03, 2007 12:34 am
Posts: 515
Location: Haverfordwest, Pembrokeshire, West Wales
Car Model: 1974 Silver 2dr 99 EMS
AlexW wrote:
identical to later engines , they just have a very slightly larger bowl in piston crown


So they would be lower compression then as per pre 75.

<1975 8.7:1
1975> 9.2:1

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76 99 Ems 2dr
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PostPosted: Sun Dec 02, 2018 9:07 am 
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Gosh you know your stuff


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PostPosted: Sun Dec 02, 2018 3:53 pm 
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Joined: Mon Nov 21, 2011 12:23 pm
Posts: 1908
Location: London & Suffolk
Car Model: Saab 99 Turbo
Never mess with a mad Welshman... :lol:

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PostPosted: Sun Dec 02, 2018 6:13 pm 
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I have fitted them to later engines no problem and just skimmed the head slightly to bring back the compression ratio


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PostPosted: Wed Dec 05, 2018 4:56 pm 
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Light Pressure Turbo
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Joined: Sat Mar 03, 2007 12:34 am
Posts: 515
Location: Haverfordwest, Pembrokeshire, West Wales
Car Model: 1974 Silver 2dr 99 EMS
AlexW wrote:
I have fitted them to later engines no problem and just skimmed the head slightly to bring back the compression ratio


Please don't think I was saying they wouldn't work Alex.
As you rightly say, the head could be skimmed to bring the compression to somewhere near standard for the other type piston.

Whether or not Olly wants to go this route or not, I'm not sure, but it is an option for sure.

Will

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76 99 Ems 2dr
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