Ausmini
It is currently Wed Nov 22, 2017 1:59 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Sat Apr 29, 2017 12:04 pm 
Offline
848cc
848cc
User avatar

Joined: Mon Dec 17, 2007 4:31 pm
Posts: 61
Location: Melbourne, AUS
Hi guys I've done something pretty dumb.

Removing the welch plugs on a 998cc block I'm about to rebuild and I put a drill into the side of the cylinder. :evil:

It's a 3mm diameter hole about 2.4mm deep into a 5.2mm thick wall.

Do I get a workshop to braze it or chuck it?

To complicate things this cylinder has been sleeved previously. The sleeve is about 1mm thick,, so there isn't much of the original cast iron left there. It is otherwise a very tidy block.


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 12:45 pm 
Offline
Yay For Hay!
User avatar

Joined: Wed Sep 08, 2004 9:27 pm
Posts: 14685
Location: Wodonga - Vic/NSW border
WTF were you doing?? you don't need a drill to remove welsh plugs, a tek screw & claw hammer work better

so the bore itself has a 1mm sleeve, then ~1.8mm of cast iron, then your hole? I can't see it causing a problem unless you're going to run massive boost. The only issue I can think of is that it might corrode away and make the hole deeper, in which case your brazing idea would be the go

_________________
did I tell you that I won a trophy?


Top
 Profile  
 
PostPosted: Sat Apr 29, 2017 1:19 pm 
Offline
848cc
848cc
User avatar

Joined: Mon Dec 17, 2007 4:31 pm
Posts: 61
Location: Melbourne, AUS
Yeah I'm furious at myself. I didn't have a tec screw and claw hammer handy. I had a step drill and a slide hammer. I went one step too deep on the drill.

I was hoping not to have to bore out the cylinder as they are in good nick. BUT if any brazing is going to be done then it will almost certainly need a slight bore to remove any thermal distorsion.


Top
 Profile  
 
PostPosted: Sun Apr 30, 2017 8:27 pm 
Offline
Yay For Hay!
User avatar

Joined: Wed Sep 08, 2004 9:27 pm
Posts: 14685
Location: Wodonga - Vic/NSW border
Daniel Butler wrote:
if any brazing is going to be done then it will almost certainly need a slight bore to remove any thermal distorsion.


a gentle hone should find anything & take it out

_________________
did I tell you that I won a trophy?


Top
 Profile  
 
PostPosted: Wed Jun 14, 2017 10:14 am 
Offline
998cc
998cc

Joined: Sun Sep 04, 2011 10:46 pm
Posts: 525
Location: S.A
First thing I would think of is how far down the Bore?

Will the weakened section of the bore ever be exposed to cylinder pressure? the piston might not actually go down that far.


Top
 Profile  
 
PostPosted: Wed Jun 14, 2017 11:46 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 38141
Location: near Baulkham Hills, NSW
I wouldn't be brazing in there. The metal needs to get to red heat for this, it would take heaps of heat, and it's an invitation to crack it.
I would clean around the hole and fill it with Devcon. :)
[edit] Devcon is a filled epoxy. it's pretty strong stuff.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

Image


Top
 Profile  
 
PostPosted: Wed Jun 14, 2017 12:00 pm 
Offline
848cc
848cc

Joined: Tue Jan 24, 2017 7:10 am
Posts: 108
If it hasn't gone all way through or touched the sleeve I'd leave it alone or fill it or as suggested with Devcon or one of the metal type epoxys.


Top
 Profile  
 
PostPosted: Sun Sep 10, 2017 7:20 pm 
Offline
848cc
848cc
User avatar

Joined: Sat Oct 03, 2009 10:21 pm
Posts: 403
Location: Perth
I've got a spare 998 full engine if you want it! But I might be a long way away :)

_________________
Regards,

Mike
"He who dies with the most toys wins."


Top
 Profile  
 
PostPosted: Sun Sep 10, 2017 7:28 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sat Jun 09, 2007 2:01 pm
Posts: 3284
Location: melbourne ferntreegully
got a couple of spare blocks here

_________________
65 panel van sprog
73 panel van iggy
2004 cooper S imp


Top
 Profile  
 
PostPosted: Mon Sep 11, 2017 7:13 am 
Offline
1098cc
1098cc

Joined: Sat Jul 23, 2011 8:17 am
Posts: 1820
Location: san remo nsw
She'll be right, just put it together and forget about it. I've seen worse with zero affect. I've seen rust holes through bores fixed by sleeving. There could be rust holes bigger and closer to bore wall In yours but you'd have to X-ray the whole block to see them. It's a mini engine not a 1000hp dragster.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

cron

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.