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Registered:
May 2005
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18RG, need new OS pistons
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Mon, 18 July 2005 08:25
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okay, gota get my block rebored and will need an OS piston. just wondering where or who can supply this and how much it will roughly cost.
i read in some old topics of some 9.7 OS 0.5m pistons, do geniun still sell these or what?
what about pistons from another motor?
any help would be great.
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Location:
Tamworth
Registered:
August 2004
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Location:
townsville NQLD
Registered:
February 2004
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 09:38
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im pretty sure that 20R pistons work and they are still available.
also, i think i recall somebody saying that you can get these pistons genuine from toyota still 
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Registered:
May 2005
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:17
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what comp ratio will the 20Rs give me and what diamater are they. i think from memory my bores are 88-89mm. If i can get second hand or even a piston from another engine would be great, coz atm i dont want a $1500 dollar bill. but if i really need to get new pistons i will do.
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:19
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special pistons in melb will do forgings for about 1100 aussie with pins and rings and any size you wont in comp or over size
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Registered:
May 2005
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:23
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by the looks of things pistons will be around $600.
i will not need a forged piston as im not going to run any form of boost. so a standard piston will do
generally id love to spend as little as possible on pistons. thats why im looking towards another make of piston from another motor.
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:26
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i think you will find that 20 r are flat top pistons not the same as 18rg dome jobbies
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Location:
townsville NQLD
Registered:
February 2004
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:33
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if its not for a turbo application, why not just source some second hand 18rg pistons.
see "mr dohc" 's thread - i think he is selling some
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Registered:
May 2005
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 10:36
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i have 18rg pistons, but my bore is slopping.
ie, my ring at the bottom of the bore has a 20thou gap and at the top it has a 30 thou gap.
unless there are different diamiter RG pistons??
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Location:
Adelaide
Registered:
June 2003
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 16:23
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You could get some early edition 22R pistons and have them remachined to suit the 18RG valves.
The absolute cheapest forged option is pfobably a set of Mahle Forged VW 311 bigbore pistons. $600, you'd have to get the 92mm/39mm comp height ones and get the block skimmed 0.5mm to get a compression ratio of 7.5:1 maximum. If you want 9.7:1 these are not an option, obviously.
The custom cast pistons from JP Engineering (Adelaide) are a reasonable option. You'd want to upragde the rings to chrome ones though.
Used to be $660 per set, don't know about now.
Contact me if you nee more info, those guys have a few attitude issues on occasions, I have all the specs for the pistons thay've already done.
Whatever compression you want upto 12.5:1.
Then it comes down to what Jeffro RA28 posted for the websites.
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Location:
Nor Calif USA
Registered:
June 2002
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Re: 18RG, need new OS pistons
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Mon, 18 July 2005 23:55
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| CelicaRA45 wrote on Mon, 18 July 2005 20:26 |
i think you will find that 20 r are flat top pistons not the same as 18rg dome jobbies
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No your wrong.
the 20R are dome pistons I do have a set of the in a RG block.
here is a pic of the 20R forged pistons in the RG block.
by the way. the pistons are 90mm the stock 18RG pistons are 88.5mm
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Registered:
May 2005
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Re: 18RG, need new OS pistons
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Tue, 19 July 2005 06:51
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so what comp would these 20Rs leave me with? i dont mind if i have standard comp or high comp.
do the 20R pistons need to be modified at all?
are the 20R still a common piston and would soucing them be easy.
coz right now its either leave my block and throw my new rings on or spend at the most $300 for other pistons and machining.
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Location:
Brisbane
Registered:
October 2002
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Re: 18RG, need new OS pistons
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Tue, 19 July 2005 12:33
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hey turboRG, what brand are they
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Location:
Nor Calif USA
Registered:
June 2002
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Re: 18RG, need new OS pistons
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Tue, 19 July 2005 17:41
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| ra40coupe wrote on Tue, 19 July 2005 16:51 |
so what comp would these 20Rs leave me with? i dont mind if i have standard comp or high comp.
do the 20R pistons need to be modified at all?
are the 20R still a common piston and would soucing them be easy.
coz right now its either leave my block and throw my new rings on or spend at the most $300 for other pistons and machining.
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All I had to do was over bore the cylinders and I'm still using the stock RG connecting rods.
there easy to get here in the States. I paid $350 USD.
the compression is almost 9to 1.
I have a friend that's using flat top forged air cooled vw piston.
his compression is in the 7s and he runs 16lbs of boost on the street.
Mr DOHC hey turboRG, what brand are they
they are Wiseco
http://pg.photos.yahoo.com/ph/toyceli72/my_photos
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