Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Incredibly violent banging under hard acceleratio?

Good morning Greg. Having owned from new and driven 9000 miles in a 2016 M3W, I'm a little alarmed in this thread and another you started that so little consideration is being given to the running-in process which as already mentioned is ECU controlled up to 20 hours on the engine. Your initial comment the engine wouldn't rev beyond 5000 rpm and now full throttle issues in low gears with only an hour or two on the engine raise further concerns! My own thoughts are that extreme early hard use has highlighted a bevel box location issue. This could be as already suggested, a loose NVH mount which cushions the location of bevel box or even a broken mounting lug for same. Either way the considerable torque reaction from the engine is likely smashing this box against the chassis giving rise to the horrendous sounds you are hearing and feeling. It may be solved by tightening drive belt but I never had to touch mine during the two and a half years of ownership. To give you a guide, when new tension was such I could only twist top of belt through maximum of 30°and was still exactly the same after 9000 miles.

As suggested Phil Bleazey is the man to contact for long term solutions to the M3W drivetrain he has developed, although in the short term, a visit to your dealer for belt tension check or warranty work if more serious problems are found may be in order. I wouldn't mention to the dealer your early hard use though if you want the factory to cough up on possible repairs.