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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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18R-G high comp pistons wanted - 9.7:1 or higer
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Sun, 16 November 2003 09:29
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rebuilding time... i want some higher compression pistons than the wussy 8.7:1's that are found in my 18R-GU.
Forged, cast, whatever you have let me know!
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Location:
1st street on the right
Registered:
November 2002
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Sun, 16 November 2003 11:13
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Only source I've found has been JP's in Adelaide. Steve M on here set me the following and can organise as he lives nearby (something I'm yet to do)
Yes, the 9.7:1 dome i slightly over size should give you a CR of a little over 9.7:1.
I have the Hastings part number for the 89mm bore (0.5 OS)
(Hastings premium RS1294020CR4H) is for 89 bore (.020" OS)
I think rings are available for upto 1.5mm over size in .5mm increments, but can not remember for sure. The part number is pretty easy to understand and I could make that one up for you if you want.
IF you went for the 89 bore then the the 9.7:1 dome would give you comprtession readings between 188psi and 184psi ish. That is what we got with the same set up at least, and the cams that you are running will make a difference too. Ours were 88251 cams, which would account for the readings being slightly higher than the book's 179psi ish figure.
THe best way to go is to get the pistons and then get the block bored to suit, as there are bound to be very small differences between them.
SOMETHING TO NOTE:
Do not follow the .08 - .1mm end gap figure that the book gives. The end gap should be around .356mm minumum
(our end gap was .39 after the boring and new pistons and new rings, the guy who did the work on the engine said that about right)
Justin
PS if you are thinking of ordering let me know as I need same and they need to be made anyway, should be just under $600 without rings (they supply but aren;t that great)
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Sun, 16 November 2003 21:17
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well in comparison to buying a set of 10.5:1 forged pistons with 92mm bore from Toysport in USA for $US500.... i think i might know where my money is going!
Also makes life a LOT easier considering i'll be going to their shop in less than 3 weeks 
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Location:
Canberra
Registered:
December 2002
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Mon, 17 November 2003 01:15
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I just bougth a genuine 1MM oversized from toyota. Give it a go you never know your luck in the big city.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Mon, 17 November 2003 06:49
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i did.... $160 per piston for the 8.7:1
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Location:
Adelaide
Registered:
June 2003
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Tue, 18 November 2003 03:50
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$160 each, geez that's high.
My brother paid $344 for an entire set of 9.7:1 pistons in .5 oversize, genuine parts.
There were two sets of these pistons left in Sydeny a few months ago.
I can find them if you want, I don't know where they are, but I do know who can get them for around that price.
Let me know if you are interested.
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: 18R-G high comp pistons wanted - 9.7:1 or higer
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Tue, 18 November 2003 10:56
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might have some 11to 1 forgys by this week end remind me am picking up heaps of stuff in the rg department
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