Martin S. Posted January 14, 2002 Share Posted January 14, 2002 My 2Ltr Dunnel Zetec has twin 45's fitted and every MOT I have to screw in the idle mixture screws (by which time it's running rough as ****) to get it through the emissions test, then after screw them out again. Is this normal or should I get the jetting looked at? Link to comment Share on other sites More sharing options...
Roger King Posted January 14, 2002 Share Posted January 14, 2002 You would normally expect acceptable emissions with the car idling happily. Is your MOT station aware that amateur built cars should be tested for visible smoke only? This problem shouldn't arise. Link to comment Share on other sites More sharing options...
Jam Mad Posted January 15, 2002 Share Posted January 15, 2002 echo that... at my last mot the mechanics looked at it, checked it for co2 but not emissions, had a fag, and then gave me my form. and it's a 1700 xflow... so not the most environmental motor car... i think you should change mot garage. cheers, j Link to comment Share on other sites More sharing options...
Martin S. Posted January 16, 2002 Author Share Posted January 16, 2002 Hmm though emissions test was CO2 test! Link to comment Share on other sites More sharing options...
Roger King Posted January 17, 2002 Share Posted January 17, 2002 For a non cat car, the MOT is looking for CO (not CO2) and hydrocarbons (unburnt fuel). For a cat car they will also look at the lambda (fuel/air ratio) reading. The permissible limits vary according to vehicle age. For amateur built vehicles they should test as though it is a pre 1974 (I think this is the right date) vehicle regardless of age. All this means is that they look for unacceptable levels of visible smoke. Link to comment Share on other sites More sharing options...
Sam Monoogian Posted January 17, 2002 Share Posted January 17, 2002 Wandering slightly off-topic, does the pre-1974 rule also apply to SVA tests. I've got a 1980 chassis that's been restored and will have to SVA it with a 1600 X-Flow of unknown age. Link to comment Share on other sites More sharing options...
Mark H Posted January 17, 2002 Share Posted January 17, 2002 When i MOT,d my 88 cross flow last year i was told that only factory built cars had to pass the CO2 test , not home built .does any one know if this is correct? Mark smile.gif Link to comment Share on other sites More sharing options...
philwaters Posted January 17, 2002 Share Posted January 17, 2002 Sam, has the Chassis never been registered before? If so, then you will not need to SVA - just update the registered details with the new engine details. If not then you are right - for a newly registered car it will have to be SVA'd. As far as I know if you can not prove the age of the engine then it is treated as new - but don't quote me. Phil Waters 1600 X/flow - soon to be 2000 Zetec wink.gif Link to comment Share on other sites More sharing options...
mike ashurst Posted January 17, 2002 Share Posted January 17, 2002 For the MOT and emissions, here is a good place to look, I went through the agony's last Feb. Mike Link to comment Share on other sites More sharing options...
hugh Posted January 19, 2002 Share Posted January 19, 2002 i have just passed the SVA 1650 CROSSFLOW, the following applied with regards emmissions pre 1976 engines a visual test is only required between 1976 and 1986 its tested on hydro carbons and co2 which is not very stringent (my engine with flat topped pistons and ancient carbs passed, by changing the main jets just for the test),emmision tests vary from one mot station to the other my local station used to only do a visual on my old w*******d and the same shall apply for the caterham in a few years time, my advice is find another testing station. Link to comment Share on other sites More sharing options...
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