Griff new owner
Discussion
Hello everyone,back in the Tvr fold having owned two wedges in the very distant past.had the griff about a month,and working through bits and bobs that need doing.now this is probably a daft question does my griff 500hc have cats?previous owner says no it doesn’t,car registered may 1994.
Thanks for replies in advance.
Thanks for replies in advance.
If you have the collector that is connected to the manifolds with clips instead of bolts, it will be a catalyst car. I would expect it to be if it is a 1994 car. There was a crossover period in early 1993 where some manufacturers had cars still to be registered, but as a low volume seller, TVR made all the 500s with cats, unless it was an export repatriated?
There's a chance someone may have gutted it to remove the honeycomb catalyst internals and there are also pre-cats inside the manifold to reduce emissions when the engine is cold. Even more of these have been removed. Emission tests are done on a warm engine so it should pass if the main cat is still in place. Some cars can be run lean enough to pass the test without a cat fitted, but unlikely in this case! There are the cliché 'friendly' MoT testers of course.
There's a chance someone may have gutted it to remove the honeycomb catalyst internals and there are also pre-cats inside the manifold to reduce emissions when the engine is cold. Even more of these have been removed. Emission tests are done on a warm engine so it should pass if the main cat is still in place. Some cars can be run lean enough to pass the test without a cat fitted, but unlikely in this case! There are the cliché 'friendly' MoT testers of course.

The precats are inside the exhaust manifolds. There are several threads on here regarding them no doubt, here's one I found with a search. It's not easy and they'd have to come off the car to do it:
https://www.pistonheads.com/gassing/topic.asp?t=16...
https://www.pistonheads.com/gassing/topic.asp?t=16...
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