How thick

[cabrioman]

My Cabrio (Hunter) chassis is currently away at the powder coaters being refurbed and is hopefully comming back shiny new (well matt) this Friday.

One of the first jobs when it arrives back is to build the engine mounts for the rebuilt M20 thats sitting there waiting to go in it.

I tend to be a bit over the top belt and braces as a rule, and was planning on using 4mm mild steel (triangulated) for the mounts, is this over the top, can anyone tell me what thickness marlin used for the factory mounts.

The thicker it is the harder it is to work so if 3mm will do the job ???

Advice needed.

John

[Chris Cussen]

Hi John,

I was expecting to read a DOH! entry.

Chris
PS I'd go for the 4mm, overengineered is fine. On my old Spartan Trekka the had used some bent baco-foil for an engine mount, and I finally replaced it with some disk-pad left overs welded up and it never gave any problems after that.

[Mike]

Hi John

My Marlin engine mounts are only 3mm thick- note only. Marlin designed a long offside engine support for my M50 engine - probably 250mm from engine to support, and it is barely adequate : it definitely flexes when the engine is under load.
More important than the thickness is the depth of your support. I would aim to make a stronger one than Marlin. I know the exhaust headers, and the steering shaft may affect the design, but if you can make the support deeper than mine I definitely would.
I may strengthen mine at some point in the future.

If you would like more dimensions, let me know, though I guess the Sportster guys with M20s might be more useful?

[cabrioman]

Mike

Cheers for the info, I'll go with 4mm and beef it up if the design I am forced to use to avoid steering/exhausts requires it.

John