Mk8 A series

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matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Mk8 A series

Post by matnrach »

Good to see a new forum for Davrians.
Here are some pics of my Mk8 I have been rebuilding and developing for a number of years
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Last edited by matnrach on Sat Jul 23, 2011 4:38 am, edited 2 times in total.

matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

Just went out for a run today with the boost turned up to full bananas on the new rebuilt engine.
Bigger valves, shorter duration cam, modified inlet manifold, better head gasket and bolts and competition clutch.

Wow its quick!
And its dry so loads of grip!
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matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

Oops!
Too much boost and I have just blown the head gasket.
I will do an 11 stud head conversion but it will have to wait a bit as I'm currently doing loads of jobs on my '72 Scimitar.

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Dave6091
Posts: 147
Joined: Wed Aug 26, 2009 4:01 pm
Location: Hornchurch Essex

Re: Mk8 A series

Post by Dave6091 »

Sounds like you were having way too much fun!.

Is there not a 'wills ring' type cure for the mini as used on the imp?.

D.

matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

I guess you could engineer a Wills ring or another kind of sealing ring arrangement but it blew because there was insufficient clamping on the rear cylinder. The extra stud should cure it fine as long as I don't keep putting up the boost!

matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

I found this video from last year.
Boost gone up considerably since then though (hence gasket failure) - Must get it fixed



http://www.youtube.com/watch?v=7RVweeex6zk

matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

Bit of an update.

I found out what caused the gasket failure in the first place. It was detonation.
So with a new gasket fitted with a bit more head bolt torque, the spark was retarded by 5 degrees above 0.7bar boost and looks as though its sorted.
Boost now raised to just over 1bar.

New problem. Just destroyed the diff!

So I'll be replacing it with a Tran-X 4 pin type which is much stronger.

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Hal Mercier
Posts: 182
Joined: Sat Apr 16, 2011 9:02 am
Location: SW France
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Re: Mk8 A series

Post by Hal Mercier »

Have you got any idea what sort of power it's putting out? It sounds like you could use a simple ECU to keep the advance in line with the boost! :mrgreen:

That's not Ian Sykes's old car, is it?

matnrach
Posts: 51
Joined: Sun Nov 15, 2009 9:57 am

Re: Mk8 A series

Post by matnrach »

Its got about 165hp at the moment

It has got an ECU ( no carbs or distrubutor there!).
Since its all bespoke I had to map it all myself and it needed a little fine tuning

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Hal Mercier
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Joined: Sat Apr 16, 2011 9:02 am
Location: SW France
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Re: Mk8 A series

Post by Hal Mercier »

Why didn't I see that! (The injectors)

What kit is that then? I know very little about the A series engine these days...is it something you can buy off the shelf or did you develop it yourself?

What capacity is the engine?

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