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Difference between Mk7 and MK7s 
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Joined: Mon Aug 20, 2012 10:29 am
Posts: 2
Location: Ashford, Kent
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Post Difference between Mk7 and MK7s
What is the difference between the MK7 and the MK7s.? How many had the BMW engine fitted and which BMW engine was used?


Mon Aug 20, 2012 9:42 pm
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Joined: Wed Feb 03, 2010 7:52 am
Posts: 959
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Post Re: Difference between Mk7 and MK7s
The Elva Mk.VII was designed by Keith Marsden, being built during 1963 and proved to be a great success, particularly the fantastic win for the "out-of-the-box" Porsche engined car at Elkhart Lake for the Road America 500. There were 19 of the Elva-Porsche cars built, other engines include Climax, Ford DOHC, Ford 1100 & 1600, and Osca. Two cars were suppled less engine.
The Mk.VIIS was the upgraded car for 1964 when the BMW power unit became the engine of choice, and this included modifications to the chassis (particularly to strengthen the engine bay area), larger brakes with Girling AR calipers, wider wheels to 6" & 7" rims, modified bodywork to accommodate and various other detailing. The build list suggests 15 BMW powered cars were factory built, however a number of earlier cars have subsequently been modified to BMW power and to Mk.VIIS spec. The BMW engine was developed in junction with BMW by Nerus Engineering under the control of Frank Webb based on the 1500 unit. It was offered as a race engine in 1600 and 2000 format, the dry sump system being designed by Ted Martin. Only one 1600 appears to have been factory fitted, for a hillclimb car, the rest being the 2000 units giving around 182bhp. These engines are now producing more than 220bhp through engine builders such as Lester Owen. It is likely that nearby Weslake Engineering would have had input into the combustion chamber design in conjunction with Nerus.
There are many more words and pictures to be found in the Elva book available from "all good bookshops" or of course online. ;)


Tue Aug 21, 2012 7:40 am
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Joined: Mon Aug 20, 2012 10:29 am
Posts: 2
Location: Ashford, Kent
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Post Re: Difference between Mk7 and MK7s
Many thanks for the detailed reply.
Do you know the build dates and build numbers of the BMW Mk VIIs and how many are in use today?


Tue Aug 21, 2012 11:50 am
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Joined: Wed Feb 03, 2010 7:52 am
Posts: 959
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Post Re: Difference between Mk7 and MK7s
Yes and No. We have the build details of the Mk.VII variants (and others) as recorded by the General Manager Bill Meace. While I cannot be precise, it would be fair to say that most have survived plus the earlier cars which have since been upgraded to Mk.VIIS + BMW power spec.


Thu Aug 23, 2012 6:49 am
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