I have prepared this article on exhaust systems as they relate to the Rover SD1 3500cc V8 engine.

Before making any decisions on what type of exhaust to fit it would be useful to understand the general principles of exhausts and why they are designed the way we have to buy them.

In addition what changes can be made and how will they affect the performance of the engine.

Finally, in practical terms what modifications might we make when seeking improvements.

This document in PDF format attempts to provide the insight needed to understand all the above issues.

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/AboutExhaustSystems1.pdf

Ramon

http://uk.blog.360.yahoo.com/maureen9235

http://www.vintagemodelairplane.com

Since 1996 I have been intrigued by this subject, then in 2006, Campbell Macrae found a 1986 Technical Newsletter that Rover sent to its Australian Dealers which threw new light on the subject. The following extract defined Rover’s problem:

“Fuel vaporization can occur at the injectors when a vehicle with the engine at warm to hot operating temperature is parked in the sun for a short period and then restarted. Should a customer complaint of this nature be experienced, the following action ------- etc, etc.”

Whatever solution Rover devised, it had to work seamlessly from the ignition key in order to satisfy indignant owners suffering this hot start problem every time the sun shone on their executive car just a few years after they purchased it. Not good PR methinks?

Although the original circuit diagrams are still missing I have pulled all the other loose ends of the story together to explain the physics of what happened and how Rover’s solution worked. I hope the science bears scrutiny regarding this somewhat mythical problem.

Read or Download the PDF from this Location:

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/EfiHotStart01.pdf

and the original Rover Technical Newsletter (400mb) can be found here:

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/EfiHotStart02.pdf

Ramon

http://uk.blog.360.yahoo.com/maureen9235

http://www.vintagemodelairplane.com

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Stats

This material is drawn from a technical bulletin specifically regarding engine idling problems on the Rover SD1 Vitesse with Twin Throttle Plenum, but much of the program may be applied laterally to the Single Plenum installation on both the Earlier Vitesse and Efi Vanden Plas.

It addresses a common fault known as “Idle Speed Hang-up”. Excess friction in the assembly is a killer caused variously by damage, misalignment, contamination and maladjustment. Blocked airways and air leaks are also a concern. Here is an action program to resolve the problem.

Read or download the PDF from this location:

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/Idling01.pdf

However, it covers only a small part of the complete Efi system. If there are other fuel injection problems requiring attention, they can be addressed using a Testing and Adjustment Program to be found elsewhere on the blog, or from this link:

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/EfiTestAdjust01.pdf

Ramon

http://uk.blog.360.yahoo.com/maureen9235

http://www.vintagemodelairplane.com

Here is a methodical program to test, correct and adjust the Rover SD1 Efi System that has gained an undeserved reputation for unreliability. On many cars, this is wholly due to long term neglect, lack of cleanliness and poor maintenance.

It is possible to use a scattergun approach to testing but the chances of hitting the right solution are significantly reduced. The sequence recommended in the document link below offers the best chance of solving problems. Also, bear in mind that there may be more than one fault present, thus, completing the whole program offers a good probability of curing them all.

Read or Download the PDF from this Location

http://uk.geocities.com/ramon.alban@btinternet.com/RoverVitesse/EfiTestAdjust01.pdf

Hopefully, study of the recommended process will enlighten the reader that the Rover SD1 Efi system isn’t rocket science and that by performing these simple, orderly tests, anyone might improve the performance of an afflicted system.

Ramon

http://uk.blog.360.yahoo.com/maureen9235

http://www.vintagemodelairplane.com