... out the standard H22 intake manifold mouth to 68mm?

You mean port and maybe polish right?

You bore and hone piston walls.

If so get a dremel and various heads and do it yourself.
I'll be doing this soon for a secret project.

Sorry, I say bore to mean cut out/enlarge a circular hole

And to confirm my thoughts, "Honing" in the words of Answer.com
"The process of removing a relatively small amount of material from a cylindrical surface by means of abrasive stones to obtain a desired finish or extremely close dimensional tolerance."

Basically I want to widen the opening mouth of the intake manifold to 68mm diameter to take a 68mm throttle body.

Your right, that sounds like the honing I know - but not for intakes and heads.

You can and I've seen many people using dremels to 'port' out the intake to match a larger throttle body, plus if you have the small extensions to work the runners too and smoothing out any casting imperfections. Then using buffing wheels to polish them to a smooth finish for improved airflow.

The pro's have the right tools for a proper port but it aint rocket science. I wouldn't touch my head though. You'll be fine with your intake though if you've got some time and patience. Like I said, all things going smoothly over the next couple of months I may be doing exactly this (to a degree) for my project - I'll take lot's of pics and post a little how to if you like.

You still coming Sunday I assume? We can chat more then, might even spill the beans on my plans.

I thought about dremelling, but for one I haven't got the time to do it really... Ideally I need to remove the top portion of the intake, give it to a pro to bore it out to 68mm and then have it back. Secondly... It ain't gonna end up round if I do it myself I've got a steady patient hand, but I like things perfect and I doubt I'll be able to achieve that

I've got a few mods I wanted to do to my intake as well, but I'm going to wait until I've got a bit of spare cash lying around to pick up a spare.

But yes... We can discuss all on Sunday I must remember to right down the address. The one on the website I assume?... He's not relocated or anything?

Boring and honing can be applied to any cylindrical component, have a scan of your local yellow pages to find your nearest engineering/machine shop company and get them to price it up for you. Prices will vary depending on setup costs - could be anywhere from £40 - £100.

Or

Scribe the diameter and port it out yourself.

Cheers.

Incidentally, how hard/tough is the intake?... Is a dremel going to make fast work of it, or is the intake going to eat the dremel tools?

are you going to gain that much by putting a bigger thottle body on or is it just for throttle response? and also do you need a remap or anything else?

cheers
phil

Fingers crossed I should make a bit of a gain

... Along with my BMC CDA, Mugen manifold and downpipe, ProSpeed decat and exhaust, AC fuel rail, FSE Power Boost Valve, and mapped P28

glad my p28 is coming to good use.

i have a dremel to if u need. but u will have to buy the dremel tools. as alot of mine are now shot. its not dear. if u wana go down that route then let me no.

BUT if it was me id get a pro 2 do it.........then u no its 100%

Cheers Rob I've actually found a good friend of mine who I always forget has all the milling and boring and honing equipement and skill I need I went over and saw him earlier and he's more than happy to do it for me