I just put an after market cam in my '78 Spitfire. It said on the box the
cam was for a Mk.3 and I ordered standard Mk.3 cam bearings. The machine
shop just pressed the bearings in, no boring.
Joe Curry wrote:
> The recent thread about Cam Bearings has stirred me to do some research
> and after doing so, I am no more clear on the subject as I was before
> the study. Here's what I found:
>
> The three different cams I found are
> 1. All Mk1 Spitfires
> 2. Mk2's and Mk3's
> 3. '69 Mk3 through 1500
>
> The cam bearings being offered appear to cover all Spitfires to 1972
> 1300 engines.
>
> Ny quandary is: If the cams are the same from 69 through the 1500's, the
> bearing journals must all be the same size and in order to install cam
> bearings in the engines that do not have bearings, one would have to
> align bore the block to the size that will allow the bearings from
> earlier engines to fit. I had that done with my 1500 engine, but I
> don't know if the machine shop used early Spitfire cam bearings or some
> "off-the-shelf" ones that they had.
>
> Anyway, if anybody can add anything to this (or tell me that I am full
> of ****) please do.
>
> Regards,
> Joe
> --
> "If you can't excel with talent, triumph with effort."
> -- Dave Weinbaum in National Enquirer
|