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Location:
Brisbane
Registered:
July 2004
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different 18R Pistons
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Wed, 21 July 2004 00:27
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I have been looking for a set of pistons for an 18R-GEU. i phoned all the toyota dealerships in brisbane, and i found that the GEU pistons are very different to the G pistons. the g pistons are dome top and square where the pin goes through the skirt and i believe they have a compression ratio of 9.7:1 . the GEU pistons are flat top and have no flat areas where the pin meets the skirt. both sets of pistons have fly cuts for the valves which is what sets them apart for the 18R-C pistons. the delima i face is that i need the GEU pistons for the lower compression ratio as i am turbo charging the engine, and i cant machine the G pistons as that would weaken the crown and i would burn holes in them. does anyone have any ideas about wot i could do? i cant get the GEU pistons from anywhere in bris, i found a set of G pistons that are 40thou OS but cant use them.
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Location:
Bendigo
Registered:
July 2004
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Re: different 18R Pistons
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Wed, 21 July 2004 01:14
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Are you sure you cant machine the G pistons we used to take of up to 10mm then flycut for conversion in L20 datsun motors to run on avgas.
regards
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Registered:
November 2002
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Re: different 18R Pistons
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Wed, 21 July 2004 01:25
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I remember reading somewhere that the pistons that VW sell as standard replacement parts can be used in boosted / blown 18R/RG engines, they are standard forged items and suit a lower comp. ratio.
Pick the brain of the VW parts dealer.
Mitch.
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Location:
Bendigo
Registered:
July 2004
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Re: different 18R Pistons
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Wed, 21 July 2004 01:26
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Sorry meant to say 18r pistons not g.
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Location:
Brisbane
Registered:
July 2004
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Re: different 18R Pistons
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Wed, 21 July 2004 03:21
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Cheers for that mitch. i will do some more research and see what i can come up with. Its an interesting concept using VW pistons because i know that they have an unusual offset for the pin. somthing to do with the design of the flat 4 motor.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: different 18R Pistons
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Wed, 21 July 2004 05:12
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I wouldnt go for the VW pistons, last i heard someone ended up with a 7.0-7.5:1 compression ratio  I would never want something that low.
If you have a spare set of 18R-G pistons, i might be interested in them as a temporary measure for myself, (Maybe)
I too am going the path of the exhaust driven sucker, and am currently looking at some aftermarket forged pistons for my 18R-G. At the moment there is two of us looking at buying these pistons, so if you joined in it might help make prices a little nicer (already below $1000, more like 800-900).
Contact me if you want more info.
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Location:
tas
Registered:
June 2002
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Location:
Brisbane
Registered:
July 2004
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Re: different 18R Pistons
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Wed, 21 July 2004 06:36
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These Forged pistons u r organising, are they the flat top low compression or the dome top? i would definatly be interested if below $1000. PM me with some contact details and i will let you know.
Cheers
Dan
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Location:
Brisbane
Registered:
July 2004
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Re: different 18R Pistons
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Wed, 21 July 2004 06:38
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Thos pistons u posted photos of look like 18R-C pistons. the only difference i can see by those photos, is the oil gallery on the side near the pin holes. hope that helps
Dan
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Location:
tas
Registered:
June 2002
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Re: different 18R Pistons
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Wed, 21 July 2004 06:45
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thanx for clearing that up.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: different 18R Pistons
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Wed, 21 July 2004 06:52
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Read the part number off them if you can.
As for the forged pistons. Yeah we are looking at around mid 8:1 compression, perfect for turbo. Probably Wiseco items. PM sent.
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Location:
tas
Registered:
June 2002
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Re: different 18R Pistons
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Wed, 21 July 2004 07:02
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two numbers inside the actual piston, on one side it says 34010 and the other side 61. Any idea if the 18-RU pistons are just the same as 18-RC?
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Location:
SYDNEY
Registered:
August 2003
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Re: different 18R Pistons
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Wed, 21 July 2004 11:49
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If your looking specifically for forged with low comp, I cannot help. But if your looking for 18rgeu with 8.2 comp I have a set if thats what you may want.
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