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piston rings size
http://auszookers.com/forum/viewtopic.php?f=5&t=17123		 Page 1 of 1
Author:  zooky08 [ Sun Nov 28, 2010 10:28 am ]
Post subject:  piston rings size
after pulling apart my g16a engine down to nothing ready for a rebuild i found theres not much cross hatching left in the cylinders, and a fair bit of scratches in all cylinder bores hence why i think my piston rings are shot. so need a hone and some rings, but i dont no much about the sizes and all that.

what is the standard piston size for a g16a. mine said 0.50 on top. not sure if thats over size or not. does suzistore have rings for this piston.

another thing is i see on cylinder two and three is on the bottom of the sleeve its chiped away, or looks like it wasnt made properly from factory

Aaron
Author:  Damo [ Sun Nov 28, 2010 10:41 am ]
Post subject:  Re: piston rings size
Standard bore size for g16 is 75mm
Author:  zooky08 [ Sun Nov 28, 2010 7:02 pm ]
Post subject:  Re: piston rings size
Mine measured around the 76mm mark(dogey) ill have to measure it properly
Author:  Damo [ Sun Nov 28, 2010 11:06 pm ]
Post subject:  Re: piston rings size
zooky08 wrote:
Mine measured around the 76mm mark(dogey) ill have to measure it properly


It could be overbored already?
Author:  want33s [ Sun Nov 28, 2010 11:33 pm ]
Post subject:  Re: piston rings size
If the pistons have "0.50" on them it has been bored half a mm (or 20 thou).
So bore size should be 75.5mm
Author:  zooky08 [ Mon Nov 29, 2010 12:17 am ]
Post subject:  Re: piston rings size
want33s wrote:
If the pistons have "0.50" on them it has been bored half a mm (or 20 thou).
So bore size should be 75.5mm
measured bore with veniers and got 75.5mm so you are correct. Will it be ok to give the bore a hone to get my cross hatching back nd does suzistore have rings for these piston if not weres the best place to get good qaulity rings
Author:  want33s [ Mon Nov 29, 2010 2:05 am ]
Post subject:  Re: piston rings size
zooky08 wrote:
want33s wrote:
If the pistons have "0.50" on them it has been bored half a mm (or 20 thou).
So bore size should be 75.5mm
measured bore with veniers and got 75.5mm so you are correct. Will it be ok to give the bore a hone to get my cross hatching back nd does suzistore have rings for these piston if not weres the best place to get good qaulity rings

Any auto parts shop should be able to supply an oversize ring set.

Honing and 0.5mm rings will get you going but won't last anywhere near as long as new +1.0mm pistons and rings and rebore.
I recently had an F10A bored and honed 40 thou (1.0mm) for $120.
Author:  zooky08 [ Mon Nov 29, 2010 2:56 am ]
Post subject:  Re: piston rings size
didnt wont to get new pistons. the list is pretty big atm. i guess its better in the long run to get new pistons.my best mates dad is a engineer who rebuilds speedway cars, so ill ask him if he can rebore my block.

can you get 1.0mm piston and rings from repco, suzistore or lowrange. considering to get some high compression pistons if they will fit with out much work (valves) i see lowrange have them in 20, 40 and 60 thou but is that standard or 20, 40 60 thou over standard. i dont really get all this thou shit :?

Aaron
Author:  royce [ Mon Nov 29, 2010 3:52 am ]
Post subject:  Re: piston rings size
40 though to a mm, best to not buy pistons till a mchine shop or somebody with the CORRECT gear can measure your bore, its likley to be out of round lower down and 1.0mm pistons might not be enough
Author:  zooky08 [ Mon Nov 29, 2010 4:10 am ]
Post subject:  Re: piston rings size
i measured all bores witha vernier and got 75.5mm but i guess verniers are shit. the piston is 75mm. my bores are out of round now cos one way its 75mm and the other is 75.5mm. gonna take it to a engineer.

thought this was going to be a cheap rebuild, im thinking different now :S
Author:  Damo [ Mon Nov 29, 2010 4:46 am ]
Post subject:  Re: piston rings size
zooky08 wrote:
i measured all bores witha vernier and got 75.5mm but i guess verniers are shit. the piston is 75mm. my bores are out of round now cos one way its 75mm and the other is 75.5mm. gonna take it to a engineer.

thought this was going to be a cheap rebuild, im thinking different now :S


One point Royce was trying to make is that verniers are not what you should be measuring the bore with.
Author:  zooky08 [ Mon Nov 29, 2010 5:00 am ]
Post subject:  Re: piston rings size
Damo wrote:
zooky08 wrote:
i measured all bores witha vernier and got 75.5mm but i guess verniers are shit. the piston is 75mm. my bores are out of round now cos one way its 75mm and the other is 75.5mm. gonna take it to a engineer.

thought this was going to be a cheap rebuild, im thinking different now :S


One point Royce was trying to make is that verniers are not what you should be measuring the bore with.
i get what he saying. i just used verniers to get a estimate and verniers are much better then a ruler :lol:
Author:  royce [ Mon Nov 29, 2010 5:05 am ]
Post subject:  Re: piston rings size
the real wear will be down lower, up the top the piston hasnt touched so will read pretty good :)

set of pistons and a bore is pretty cheap over the next 200000km
Author:  zooky08 [ Mon Nov 29, 2010 6:08 am ]
Post subject:  Re: piston rings size
ok ill just take it to a engineer and see what he says
Author:  got_bar_work [ Mon Nov 29, 2010 6:19 am ]
Post subject:  Re: piston rings size
i just went through this last week and 40 thou is about as big as u want to go before the bore ends up bigger then the head gasket opening
Author:  steak_knife [ Mon Nov 29, 2010 6:23 am ]
Post subject:  Re: piston rings size
got_bar_work wrote:
i just went through this last week and 40 thou is about as big as u want to go before the bore ends up bigger then the head gasket opening


Tic tic tic tic... :lol:
You could get a gasket made....
Author:  zooky08 [ Mon Nov 29, 2010 6:47 am ]
Post subject:  Re: piston rings size
head gasket is the last thing on my mind :)
Author:  Jester [ Mon Nov 29, 2010 8:08 am ]
Post subject:  Re: piston rings size
well mate, youre doing better then me, just pulled it down and found a dirty great crack between piston 1 and 2, so im on the look for another block
Author:  zooky08 [ Mon Nov 29, 2010 8:25 am ]
Post subject:  Re: piston rings size
oh thats not good. only bad thing about my block im not sure about is that at the bottom of the cylinder sleeve is broken/chiped away or might just be when it got manufactured
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