Hi

Anyone on here please got experience of fitting and running a catalytic converter to 1300cc Ford Crossflow engines when required to do so in the 750 Motor Club Locost race series for cars built after 31 Dec 1999? This would have been for cars with no electronic management system, just distributors.

As far as I can tell this requirement came in sometime between 2007 and 2013 and was specifically withdrawn by the 2017 regulations (I have a copy of the 2007 regs where this cat requirement is absent but is in the 2013 regs until specifically withdrawn by the 2017 regs, see the 750 MC website: http://www.750mc.co.uk/formulae/locost/regulations.htm). I guess not too many of these race cars ran with a cat as the series at the time may have had many existing cars built before 1 Jan 2000.

My reason for asking is that to run my 1300 Crossflow Locost project that seems to have a lot of old 750 MC bits in hillclimbs and sprints this requirement for a cat might still apply when not running as a road car, but no cat needed for an SVA’d car running and competing as a road car (I am checking the regs, the MSUK Yearnbook, Section J Vehicle Regs, regn J5.16.17 https://www.motorsportuk.org/wp-content/uploads/2021/12/146-165-Vehicles-J.pdf & Section S for sprints & hillclimbs, regn 12.5.4: https://www.motorsportuk.org/wp-content/uploads/2021/08/2021-09-02-motorsport-uk-yearbook-2021-p349-359-specific-regulations-sprints-hill-climbs-and-d rag-racing-s.pdf)

Unfortunately although an old STM chassis, I am uncertain if it was ever a complete car on track (and looks like never on road) or by this cut off date.

The 2017 750 MC Locost race series regs deleted -‘ All vehicles constructed after 31/12/99 must be fitted with a catalytic converter in the exhaust system’ which was replaced by: ‘ As engines designed and manufactured before 31/12/99 catalytic converters are not required’. I note that Crossflow engines and A Series engines due to their age can also go through SVA for road use without a catalytic converter.

Cheers
Mike

[Edited on 20/1/22 by Mike Wood]

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Have a read of this:

https://forum.wscc.co.uk/forum/topic/134114-catalytic-converters-update/

Basically the cat does not need to function as intended to pass scrutineering, it just needs to be fitted to the vehicle, not neccesarily in the exhaust flow at all.

It's also mentioned that road registered cars that did not need a CAT for IVA, SVA or MOT are exempt under recent MSUK rule changes, but i don't know how correct that may be.

Dave

I always thought this rule was aimed at production based cars, not race cars/single seaters?

Edit, sorry yes kit cars included.

[Edited on 21/1/22 by bozla]

Hi ya, with regards to IVA tests, you need a cat if you have an engine fitted that when first registered it had a cat fitted then, ie my xflow didn't need a cat during the IVA test as it was first registered in 1978.