Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Engine cover plus 4 2020 trad model

An engine cover is certainly a smart move to protect the most vulnerable bits from the wet. I have a plan for some protection for mine when I get some time. However I’m still not convinced yet of the commonly held louver/rusty plug theory.

I can’t comment on the GDI but having owned a Duratec without bonnet louvers and still suffered rusty plugs, I can’t help thinking that there is something else going on. My money is on condensation on the plugs owing to internal engine gases breaching the less than perfect internal cam cover sealing around the plug cavities. Paradoxically a well thought out vent hole/tube next to the plugs in the plastic cover might help.
Just a theroy but perhaps something to consider. A previous rant starts on this page...