Austin Metro VDP Engine Specs
Dave Skirrow
Does anybody have detailed technical specs for easy metros?
I need to know the differences between an '82 Metro Vanden Plas engine and
an MG Metro engine. Or more specifically what I would need to do to get the
VDP engine in the same state of tune as the MG.
The engines to drop into a Mini and there seems to be conflicting info
around the net. It seems as though the engines are identical except for the
VDP has a lower compression ratio. Can anybody confirm this as being 100%
correct? Is there any point in phoning rover to ask them or would they just
laugh at my 21 year old rust bucket?
Cheers,
Dave
Dave Baker
>From: "Dave Skirrow" dski...@nospamntlworld.com
>Date: 29/01/03 12:51 GMT Standard Time
>Message-id: <S%PZ9.516$oV3...@newsfep3-gui.server.ntli.net>
Same pistons, same compression ratio from 1982 anyway according to my data
books. Not 100% sure if that's true for pre 1982 models. The pistons show as
different. If the rated power is the same anyway (73PS) then why worry about
trying to change anything? If you wanted more power you wouldn't care what the
original spec was as you'd tune the engine to suit your needs. A ported head
and manifold and a hotter cam can add a good bit to those engines.
Dave Baker - Puma Race Engines (www.pumaracing.co.uk)
You're a big man but you're in bad shape. With me it's a full time job. Now
behave yourself. (Michael Caine in Get Carter)
Tim..
"Dave Baker" <pumar...@aol.comma> wrote in message
news:20030129080949...@mb-ch.aol.com...
I'm fairly sure the cam is specific to the MG only and doesnt it use a 1
3/4in HIF? I seem to remember it was a nightmare to get some MG's to idle
smoothly at under 1000rpm due to the more bumpy cam.
Tim..
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Guy King
from pumar...@aol.comma (Dave Baker) contains these words:
> A ported head and manifold and a hotter cam can add a good bit to
> those > engines.
Time to dust of Vizzard!
--
Skipweasel:-
"...and ninthly...."
Guy King
from "Dave Skirrow" <dski...@nospamntlworld.com> contains these words:
> It seems as though the engines are identical except for the
> VDP has a lower compression ratio.
MG 10.5:1
VdP 9.4:1
Fairly sure the MG had difference size valves and a different camshaft, too.
Dave Baker
>From: Guy King guy....@zetnet.co.uk
>Date: 29/01/03 14:34 GMT Standard Time
>Message-id: <200301291...@zetnet.co.uk>
>
>The message <S%PZ9.516$oV3...@newsfep3-gui.server.ntli.net>
>from "Dave Skirrow" <dski...@nospamntlworld.com> contains these words:
>
>> It seems as though the engines are identical except for the
>> VDP has a lower compression ratio.
>
>MG 10.5:1
>VdP 9.4:1
>
>Fairly sure the MG had difference size valves and a different camshaft, too.
Nope, same cam, valves, pistons, compression ratio, in fact evrything internal.
I checked all the part numbers in the AE catalogue listing for both cars. The
CR is quoted as 10.5 in one of my books and 10.0 in another so god knows what
it really is but it's the same for both engines anyway. The clue is the
aluminium inlet manifold which was introduced on the MG and is a hell of a fine
flowing piece of kit and responsible for a good chunk of the power increase. If
the VDP has that then it's an MG engine. All other models had a cast iron one
which was integral with the exhaust manifold. The HIF44 is the same on both
too.
Pre 1982 VDPs were different though and are listed alongside the std 1.3 engine
so again the clue will be the manifold and the quoted power output which was
about 10 less - 62 to the MG's 73. Austin only had the two engine specs in
normally aspirated metros. There is no cross breed with the ally manifold but
the std internals. The manifold will definitely indicate which engine it is.
My old MG Metro made 84 at the wheels mind you - about 105 flywheel. All on the
std valve sizes, inlet manifold and SU carb. 20 hours on the flowbench, a 1380
bottom end and a 544 cam might have had a bit to do with it though :)
John Manders
on the
> std valve sizes, inlet manifold and SU carb. 20 hours on the flowbench, a
1380
> bottom end and a 544 cam might have had a bit to do with it though :)
>
>
> Dave Baker - Puma Race Engines (www.pumaracing.co.uk)
> You're a big man but you're in bad shape. With me it's a full time job.
Now
> behave yourself. (Michael Caine in Get Carter)
Same spec as my Min but I use 2x1.75 SUs & LCB etc. I believe the 544 is a
bit high on the valve acceleration figures. Since mine is a rally/road
engine I rev limit at 7K for normal use. Also managed to pursuade Mr Vizard
to look at & flow check the head. Perhaps that says how long ago this was.
Final power was about 90 BHP at the wheels but that is (within the R/R
error) just about the same.
Found out why it was a bit slow off the line, 900+ Kg weight. Must put that
car on a diet.
John
Fred
news:S%PZ9.516$oV3...@newsfep3-gui.server.ntli.net...
Tuning the A series engine by David Vizard..
A book worth reading.
A 649 kent cam works wonders too, if you sort the exhaust out.