Cats for S.V.A.
Discussion
The donor car I have used was a '94 year model so I thouight I wouldn't need to fit a cat but it now seems as though I might have to as the car was originaly fitted with one.
So does anyone know if there might be a dodge around this requirement.
If not are there any catalists available that are very low back pressure which wont affect the power too much.
So does anyone know if there might be a dodge around this requirement.
If not are there any catalists available that are very low back pressure which wont affect the power too much.
No, you should be OK as long as you can PROVE the age of the engine. I assume that the car will be "amateur-built". If so, it will go to SVA and they will do a "CAT" emissions test on it (they call it the "Basic Emissions Test" -BET). Naturally it will fail this because it won't have a cat but the next box on the flowchart in their manual says to then go to "CAT1" test. When you do this, the next box asks if the "effective date" (i.e. the age of the engine) is between 1/8/92 and 31/7/95? The answer will be "Yes" so it then asks to see if there is an "exact match" in the "emissions publication". This is the book the MOT testers use to decide what vehicles should have to do cat tests. Obviously, your VEHICLE won't be listed (although the vehicle from which the engine came might!) The important thing here is that the whole vehicle has to match the description - not just the engine. As soon as the answer to the question is "No", you go to the 3.5% CO etc.
Thanks for that - M.O.T. tester told me something similar tonight. He said that at the last training meeting he attended all the M.O.T. testers were given a short test and this came up as one of the questions and they all got it wrong (same as me, not reading the flow chart absolutely logically)
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