7 replies to this topic

[SolarB]

I’m giving some serious thought to doing a little porting on an MG Metro cylinder head. Nothing too radical, just cleaning up and removing material around the guide boss and other areas. The yellow bible shows me where the material should and should not be removed, I’ll study that this week.

I’ve borrowed a variable speed drill (max. speed 22,000 RPM) with a flexi shaft but can anyone tell me what type of cutter I need? I’m assuming tungsten carbide ball type cutters but could someone point me in the right direction for size, shape and maybe a supplier?

[01smartc]

Search google for chromwell tools.. loads of carbide cutters and grinding stones, thats where we get ours

Cheers Chris @ Smart Performance

Here you go

http://www.cromwell....r...amp;x=0&y=0

[SolarB]

Just what I was after, thanks.

I didn’t realize there was such a choice of shape. I see cylindrical, ballnose, round tree, pointed tree, a couple of conicals and a flame in the 3mm I need. Could I get away with buying just two for porting a single head, and if so (you know what’s coming next), what shapes should I buy?

[bmcecosse]

I have always used mounted points - very much cheaper and more suited to my relatively slow running electric drill! You say '3 mm' - which is very small shank. It's not a Dremel - is it ??

[SolarB]

It's not a Dremel - is it ??

It is a Dremmel, an obsolite model which has been replaced by this - Link

It'll take a larger tool, I hadn't realised there was a collet in the chuck but you've now got me wondering if the thing is man enough for the job. Is a 300W tool going to be able to port a head?

[bmcecosse]

Err - NO ! That's just for model making I think! I use an old electric drill with simple mounted points - not ideal by any means - but it works for 'one off' jobs. Will wreck the drill (hence old) - use a vac cleaner to suck away the dust/grit while working - and wear dust mask and eye protection.

[Brams96]

I bought a 6mm carbide bit with a 150mm shaft and a cheap drill from screwfix to get right inside the port and used a normal length one to do the more outer work. It takes a lot of time and yes use a mask and vacuum, unless you want to look like you just came from the coal face
A dremel isn't really fast or strong enough, you'd go through soooo many bits by the time you were done too.

Edited by Brams96, 20 January 2010 - 09:57 PM.

[shorty]

i agree wear goggles, the dust mask isn't needed much if your doing it in an open area or have a tendancy to keep your mouth open lol

but definitely goggles