was wondering if you can get screw in welsh plugs in the size to suit a holden 6 block
screw in welsh plugs holden 6 block
#1
Posted 04 May 2016 - 04:34 PM
#2 _Agent 34_
Posted 04 May 2016 - 05:38 PM
Not to my knowledge ,
BUT i have seen a system where by the welsh plugs have been machined up out of flat plate aluminium and a " o ring put between the to mating surfaces. Then a nut on one side and a bolt running through the centre . pulling the two faces together then pushes out the O ring and seals against the block.
lot of mucking around - it has been done on a race engine - holden 6.
G
#3 _Muzzy_
Posted 04 May 2016 - 06:10 PM
#4
Posted 04 May 2016 - 06:29 PM
No reason it could not be done but why? They are not that hard to get to seal properly as long as the mating surfaces havent been gouged with a flat blade when removing the plug.
#5
Posted 04 May 2016 - 09:45 PM
cause if you run big boost/power and knowing how standard block moves around,,would save the standard welsh plugs popping out. and putting water under the wheels and putting car into the wall.
#6 _Bomber Watson_
Posted 04 May 2016 - 09:52 PM
I dont believe that has ever happened.....
#7
Posted 04 May 2016 - 10:02 PM
Having said that..I do agree that sqeezing a pressed metal cup into a cast iron block..is a cheap and nasty solution. But hey....millions of engines later, gotta say it works. The pressure applied to them is only = to the radiator cap pressure? Corrosion the real issue.
#8
Posted 04 May 2016 - 10:08 PM
202's are known to crack through the welch plug holes under the manifold but I fail to see how screw in plugs would prevent this?
#9 _datpsi_
Posted 04 May 2016 - 10:11 PM
#10
Posted 04 May 2016 - 10:38 PM
same reason why they put screw in welsh plugs in clevo/chev blocks,to add strength to block.
#11
Posted 04 May 2016 - 10:41 PM
and yes this does happen to holden 6 blocks as in popping welsh plugs out,im talking with turbo/blwn combos with big boost/power 500-600hp
#12
Posted 04 May 2016 - 10:54 PM
In severe applications the plugs can fall out.
I looked into this for a 308, ran into some issues.
Used to be able to buy a kit to do it, not anymore.
The screw in plugs are available but the correct size might be an issue and the tap for something that size is stupid expensive.
Otherwise a machinst with a cnc should be able to cut a thread but once again cost.
#13
Posted 05 May 2016 - 12:07 AM
my motor's have only cracked between the welsh plugs vertically,
but found this in the wiki:-
Quote - 'In some high-performance engines the core plugs are large diameter cast metal threaded' - end quote
https://en.wikipedia.../wiki/Core_plug
#14 _Agent 34_
Posted 05 May 2016 - 05:24 PM
A lot of nc guys run a strap down the side of the block just in case.. have tapped my front and rear ones as mentioned above.
Dan any more details on the welsh plugs and where you got them done ?
cost photos etc
#15 _datpsi_
Posted 05 May 2016 - 11:14 PM
#16 _duggan208_
Posted 05 May 2016 - 11:58 PM
I've wondered that if you had taped solid welsh plugs might add some strength to the block especially were they like to crack. Maybe even machine the block and bolt on a steel brace over the welsh plugs.
Regards
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