Head skim

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

im gunna do my own head skim....any objections to leaving the valves in? they are about 2mm down so unless i do a horrendously deep cut resulting in 15:1 odd comp i think it wil be ok.

ta kindly

jonboy

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

why not go for it.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

shall do in that case...hopefully give it a go this week

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

it should be happenin tonight...watch this space for pics later...will either be nice raw surface or a fucked head with big gouges where the cutter caught it and flung it across the workshop...lol...but hopefully not eh./

this head i think is not likely to see service again tho...so just gunna use it for practising stuff on.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

make a decision, if your gonna use it then do it carefully, if your gonna just play with it, chop the thing in half.

Cut through a port etc, learn something from it.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

now thats an interesting thought....be hard feckin work cuttin through all that with a hacksaw...but it would be worth it.............hmm ponder ponder

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

I have done it. Aluminium is easy, try doing it on a cast iron head!

Anyway you get to see the water ways, oil channels and the ports.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

another thing i heard of for similar stuff is to fill the ports with latex or silicon or something, let it go off and pull it out and u got a nice rubber mould of the port to look at....i guess this would be good for working ports, gettin them all equal...just being able to see whats goin on inside.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

problem is getting the silicone out, it tears.

The 16V head is cack tbh.

If I was designing it then I would probably gain another 10 or so horses and a good bit more torque and that would be before any hand fettling.

Main problem is the 2 inlet valves per cylinder do not flow the same amount.

Lots of probs with the head, its not that good.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

JOB DONE! 0.7mm i took off in the end....discovered head was 0.1mm thicker along one edge to the other...not anymore Wink

and this is whats left of the corner where the bolt snapped...can see the shape of the hole is still bad and the grooves are still visible even after the skim!

and heres an sction shot lol...bad quality cos was on my phone....

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

0.7 is quite a chunk to take off. but aye looks good.

How do you have the machinary to do it?

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

looks like you made 2 passes at it with the cutter as well, which is not ideal, but looks like you got a nice result.

Mine had a bit of corrosion still evident in exactly the same place, but as the corrosion coincides with the edge of the block anyway, it really makes no odds. As long as it seals round the necessary places, i figured all would be well, and it has...

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

we got a little workshop in work...simple milling machine, lathe, metalworking stuff....so i can just popp in ther in the evenings to do stuff. dead handy.

yeah 0.7 is a chunk but like i said i was just havin a go..not necessarily gunna use it. if i do hopefully ill be havin 11:1 fun Very Happy

but hopefully without goin pinkpink

Youre right neal i did have to make 2 passes cos the cutter i got is only 4" which isnt enough to do it in 1 pass...plus due to the size of the bed i could only do it by clamping on the top of the head so had to do one half move clamps and do other half...

still the mark you see is just a visual thing...cant feel it with your finger so it would be fine...