Machine Head Project

[mdm]

Terry, the picture seems to have disappeared,

[Mark Halligan]

And finally, this one showing what the first 90 mins of cartridge rolling can do to an EX port.

Paul

Try using a rotary rasp for the initial removal of metal. It's much quicker, and then switch over to the cartridge rolls for finishing.

As long as you are careful with the rasp you will be fine, you'll also save money on cartridge rolls too

Cheers

[S2central.net]

By 'rasp' you mean like a flappy wheel or something else ?

It is a bit of a learning exercise... I'm ready to get the valve guides removed on four of the cylinders so I can get in there. I'm very dubious about taking too much material off in those raised areas near the guides - guessing there must be water channels in that area.

I'll leave the 5th cylinder untouched for now to get comparative analysis on a flow-bench.

[S2central.net]

Oh and Mark - I've been remiss about sending that water rail template back to you... Send me a PM with your address when you get a chance.

[s2_bo]

If you look in my project thread you will see how i mounted the hall sender on my 3B block.

Paul are you still going to beed blast your head? I heard some horror storys

You can get the head hot tanked or acid bathed. Thats what i did and it got rid of all the crap on there...

[terrybullwon]

You can get the head hot tanked or acid bathed. Thats what i did and it got rid of all the crap on there...

Or degrease and use a commercial dishwasher

[Jas11n]

Rotory Burrs.

[terrybullwon]

Rotory Burrs.

Good picture Jas..

Mine were slighty, worse for wear after porting

[Mark Halligan]

Rotory Burrs.

Them's the things

[S2central.net]

Ahh those burrs - yes tried some small ones of those - they clagged up quite a bit and I personally found the cartridge rolls to be nice to control... But it gets a bit dull changing them so rapidly - the co**** ones really shift metal.

Actually - I've collected as much dust of the head that I can... Its a good visual as too how much metal is removed. I'll use the homologation papers as a guide to just how wide to open the ports at the manifold faces. I've just been tidying up in that area and not made big openings (also for fear of going too far).

[S2central.net]

Jees - someone change the swear filter - I'm trying to say c0**** !!!!!!!!!!!

[S2central.net]

**** sake ---> c-o-a-r-s-e

[mcandmar]

**** sake ---> c-o-a-r-s-e

Oh hes off again

[Jas11n]

These clog up less, but are harder to control the amount removed. (maybe what Mark was meaning with "rasp")

[Mark Halligan]

(maybe what Mark was meaning with "rasp")

These look similar to the ones I got from Machine Mart, nice and cheap and they don't easily clog up. But they are great for removing a lot of metal quickly if you are careful.

http://www.machinemart.co.uk/shop/product/details/2540-rotary-rasps