VIS .....What does it stand for?

[miketata]

this is peronal opinion only ....the 1.8 ...fantastic engine ,,,the best torque. smooth power. pickup , rev range. easy servicing .....blows up


diesel .... stunning power, economy ....let down by fuel pumps,mafs , flywheels clutch

v6 ...amazing sound and performance ..WHEN THE VIS WORKS ..almost always doesn't

[Jules]

In a nut shell yes!!
Apart from Wot about the V8
Mine's been pretty bullet proof so far

(apart from fan resistor and a radiator!!)

[JohnDotCom]

.....and trailing undertray.....

[Departed]

Originally Posted by Jules

Agree with Miketata
Thinking back to my old J reg Rover 827 Sterling (what a fantastic motor that was), the Honda Legend engine was completely trouble free even after 180,000 miles.

The variable inlet tracts on that were vacuum operated with a few linkages.
(didn't even have to adjust them after all those miles)

It still puzzles me how manufacturers in this day & age can produce a duff design after all previous mistakes have been learned.

I had a 2.7 Sterling too.

Generally good, but:

sump gasket started to leak best part of 30 squids for a new one,
tappetts rattled
water pump leaked when warm (not hot, not cold, only warm)
and the VIS didn't work.


Mind you the last one was because Cowley never plugged it in!


And why do manufacturers have problems? Well the supplier of one part won't want to give the secrets of their designs to another parts supplier. Bear in mind things like the VIS motors are designed by the companies who supply them, not by the Engineers at the car manufacturer. So the supplier of the 'last one' may have learned, but the supplier of the new one may not have (for example).

[miketata]

as many of you know, the 75 vis system and intake won engineering awards and trophies for design and being assembled out of light plastic instead of heavy metal.

all very wonderful except it is not durable ...we are now paying the price for plastic assembly.

the added complication was that mechanics don't underestand its technical complexity and call for an entire new manifold , not even realising the "kids toy vis motors" can be replaced.

it is basically the only archilles heel of the 2.5, if you disregard fan motors.

we were disappointed when MGR chose the old fashioned, superceded, stone-age, slow mustang tractor engine for the v8. but guess what...it's simplicty has proved to be durable and trouble free..a few ancilliaries are NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- like heater design, diffs, coolant etc but the American metal is lasting well

[Rovernut]

Miketata

"the added complication was that mechanics don't underestand its technical complexity and call for an entire new manifold , not even realising the "kids toy vis motors" can be replaced."

Isn't the main problem with sticky oil glue causing overload of the motors and subsequent disengagement of the motor gears?

Is the rattle worn valves in the manifold or noise from the motors?

Chris

[Departed]

Originally Posted by Rovernut

Miketata

"the added complication was that mechanics don't underestand its technical complexity and call for an entire new manifold , not even realising the "kids toy vis motors" can be replaced."

Isn't the main problem with sticky oil glue causing overload of the motors and subsequent disengagement of the motor gears?

Is the rattle worn valves in the manifold or noise from the motors?

Chris

No, the main problem is the soldered joints between the microswitches and the PCB. The motors themselves are usually not at fault, and toy or not, you'll find them all over the place (ever looked inside your electric mirrors for example?)

For me the jury is still out as to whether the joints fail because of movement of the switch, vibration, or poor process in the first place exarcebated (sp?)by the previous two.

[Tatts]

Here's the link to the company that repairs Manifolds.

[capese21]

My Vis motors failed yet the arm of the manifold was totaly free to move not gummed up in any way.

The weakness of the vis motors is imho the soldered joints. They lasted 60k miles and I hope they last another 60k, £120 to replace, so although a weakness not a major expense in the long run.

E.

[MN190]

Originally Posted by Tatts

Here's the link to the company that repairs Manifolds.

Anyone got any experience of using this company?