I fooked up but how bad? water feed... Updated 18-11 new pics on page 3
Turbo Mini Forums

Ok so after putting this job off for a while, dredging It would go wrong, when I got around to it, it did go wrong!

so I started with a 5mm pilot hole nice and central on the stub or the back of the block. kept going deeper and deeper not thinking I had hit anything. I read somewhere it was in a fair way in, looking back I would have gone about it very differently but it's done now!

anyway after getting about 110mm deep I broke through to... somewhere. Then started with a 8mm bit, after the bit wasn't long enough (100mm deep) for the depth I started to think something was up, 'got a torch out and a poker and shoved it in the hole' to discover a 10mm ish hole joining the one I have drilled at the top at around 90mm which I believe to be the water jacket.

now I am fairly sure the 5mm pilot hole had hit the combustion chamber. I can feel a curved wall at the very bottom of the hole which adds up with the chamber. with the piston at the bottom off the stroke it doesn't feel/look any different. so the skirt of the piston can't drop as low as the hole?

so my question is how bad is it? I figure worst case is I need a new block? or i need to strip it get the hole welded up then honed? or what I am hoping is I can tap the hole and plug it with a decent grub screw and plenty of lock tight?

what would you do?
cheers
James

Edited by maccamcvey on 18th Nov, 2012.

Does this help?

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I was just about to look for that pic

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

that is a very useful pic, but If I shine a bright light in the dizzy hole I can see a light at the end of the tunnel as it were! :(

There's no way you've gone through the bore wall. Look at the gap, your drill would have jumped into the coolant void giving you a tell tale that you had got somewhere. Get a bit of something and measure how deep you have gone. Should be easy enough to take a measurement from another block to compare.

I am 100% it's gone into the bore. I believe the pilot hole I drilled has gone through the roof of the void, as I would have felt a gap like that. then when i have drilled a larger hole it has broken into the void. when useing a thin probe in the hole going right to the bottom, the bottom of the hole curves to the left (towards #3) then marking the depth on the probe, I remove it and offer it up on the deck (head is off) and it all lines up that the 'curved wall' is the chamber.

Thanks for the replies

Edited by maccamcvey on 22nd Oct, 2012.

Pull the block of the box and have a look up your bore. It should be fairly obvious if you've gone through.

Have you got a pic to show us where you have drilled the hole?

If youve gone where the drain plug would be the 100odd mm is probibly about right judging by that picture

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

stick some water in and see if it comes out the sump plug,

Schrödinger's cat - so which one am I ???

ok some pictures for clarity...

the not so glorious hole...


very bottom of the hole as deep as possible...


once removed and placed on the deck...


other end of the stick/probe/poker with a bend on it...


with hook in the 'void' as deep as pos...(the tape has moved from the last pic)


with hook in the 'void' as shallow as pos...


then on the deck...

the engine is a brand new build so it had no fluid in it yet, the dead give away is shining a bright torch in the dizzy hold I can see light at the bottom of the hole.

I only have the rent on my lock up where I am doing body work until the 4th if nov so I am currently in a mad rush to get as much as possible done once I have done that I will pull the clutch and box off to have a look...

cheers for the input guys I am pretty gutted tbh...

Shit the bed you went in deep there!!

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

If something is worth doing, it's worth doing half of.

well I am use to going in deep you see

i know you havent got much time, but i would be stripping it and seeing for my self whats happened. get the gearbox off. Looking at the pictures though, its not looking good, and it looks like its right on the tangent of the bore, so a plug may not do the job.

I think you need to strip it personally, if you have broken through into the bore there will be swarf and shite in your gearbox now.
I know you were not looking forward to this job, but why on earth have you left it till the engine was already built! All drilling jobs should be done when machining is done, then the block needs to be cleaned thoroughly through all oilways etc.

I will strip it in a week or two. the engines in the garage at my parents house and the car is in my lockup (which is where I don't have much time)

as for drilling it now I bought the engine 3 years ago from Steve and we built it together it has being sat in my garage since then waiting of me to get a move on with having a shell worthy of a nice engine.

If your seeing light when you look down the dizzy hole the surley your not in the bore?

I dont think you would see over to the edge of number 4 that easilly.

As fenton said strip it down, and hope for the best

13.95 1/4 mile on a 2.95 fd. Carnt be that hard to beat!

are you sure, you have drilled so deep? i dont know your drill, but i think you have to feed until the chuck, to reach the bore. (my 5mm drills are shorter)
and you would slip of, when you arrive so tangential.

Edited by akirch on 22nd Oct, 2012.

http://www.minifreunde.at

Sorry to go off topic. But what is this mod you are doing? Cheers Johnny

Johnny, he is drilling into the water jacket that goes around the 4th bore - this is high pressured water and can use it as a feed for the turbo.

I have done this myself. Me and my dad found that it was about 80mm deep we had to drill and when we broke through into the water jacket the drill struggeled a bit which was a sign we had cut through.

Blow through the hole and see if there is air comming out of the water hole on the deck.

It should of been pretty obvious if you broke through the water jacket and then started drilling into the bore - I mean wouldnt you feel it jump through the air gap??

How square did you drill the hole? Did you use a Black and Decker?