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vin91
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Darwin
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August 2003
18 R pistons Sat, 20 September 2003 04:28 Go to next message
will the Conrods from an 18R engine fit the 2T Crank.

Bored the 2T out to 89mm and was hoping to fit 18R .5mm oversize pistons to the block the only problem is the Conrods, will the 2T conrods fit these pistons or is it possible to use the 18R's Conrods.
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earlyrolla
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Location:
Perth
Registered:
May 2003
Re: 18 R pistons Mon, 22 September 2003 02:59 Go to previous messageGo to next message
I am pretty sure that the 18R has a larger big end journal size so the rods wont fit the 2T crank (please note I am not 100% sure on this).

In terms of 18R pistons into the 2T, again I am pretty sure they run different gudgeon pin heights and different gudgeon pin diameters.

You should do some research first by looking at some of the catalogues available (if you haven't already done so), here is the ACL site:

http://www.acl.com.au/web/aclwebsite.nsf/pg_cust_p cat?OpenPage

Download their piston catalogue and have a look through, you might find a different piston that is more suitable.

[Updated on: Mon, 22 September 2003 03:02]

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vin91
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Darwin
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August 2003
Re: 18 R pistons Mon, 22 September 2003 03:47 Go to previous messageGo to next message
Have looked and while there are a number of pistons out there It does not mention the gudgeon pins which I would think would be the easiest.
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vin91
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Darwin
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August 2003
Re: 18 R pistons Mon, 22 September 2003 07:13 Go to previous messageGo to next message
Have downloaded a Piston Catalogue and there is not much difference between the pistons. The Piston Dia is 88.5 for the 18R the Gudgeon Pin is 22mm and the Comp height is 39.3mm Locking for Pin is different but will it matter?

The 2T is 85mm, 22mm, 39.0mm
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earlyrolla
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Perth
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May 2003
Re: 18 R pistons Tue, 23 September 2003 06:21 Go to previous messageGo to next message
It has been a while since I looked myself Embarassed
Didnt think they were so close, sorry.

I know that the 18R has a fully floating gudgeon pin which means that the piston has groves for circlips and the small end of the conrod has a bronze(?) bush in it.

Are the 2T gudgeon pins press fit?

Even if they are, provided that gudgeon pin hole in the piston was EXACTLY the same between the 2T and 18R then there would be no problems in leaving the gudgeon pins as press fit and leaving out the circlips in the piston(not needed on press fit pins). This could be done as the gudgeon pins press fit into the rods and not the pistons.

If the 2T rods are already fully floating then it would only be a matter of using the right length gudgeon pin for the piston used.

If the 2T rods are press fit and you want to convert them to fully floating then you will need enough 'meat' around the small end to bore the small end oversize and press in a bush.

Does this answer the question?

[Updated on: Tue, 23 September 2003 11:51]

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vin91
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Darwin
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August 2003
Re: 18 R pistons Tue, 23 September 2003 10:48 Go to previous messageGo to next message
Thankyou The 2T Pistons are press fitted but I don't foresee that as a problem, So it looks like 18R Pistons will go into my 2T. Now anyone tell me what Cubic Capacity (litres) 89mm Pistons will make in a 2T. Thank's again
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earlyrolla
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Location:
Perth
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May 2003
Re: 18 R pistons Tue, 23 September 2003 12:04 Go to previous messageGo to next message
Ok,

area of a circle = pi x radius^2
volume of a cylinder = area x height
volume of 4cyl is therefore = pi x radius^2 x height x 4 (cyls)

where pi = 3.141592654
radius = bore / 2 (in centimetres)
height = stroke (in centimetres)

for the original 2T
volume (cc) = pi x (8.5/2)^2 x 7.0 x 4
volume (cc) = 1588.86

for the o/s 18R pistons
volume (cc) = pi x (8.9/2)^2 x 7.0 x 4
volume (cc) = 1741.92

Or 1.74 Litres
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Norbie
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Location:
Brisbane
Registered:
May 2002
Re: 18 R pistons Tue, 23 September 2003 23:36 Go to previous messageGo to next message
Or you could just use 3T internals which will give you 1.77 litres. Sounds heaps easier to me!
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vin91
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Location:
Darwin
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August 2003
Re: 18 R pistons Wed, 24 September 2003 00:34 Go to previous messageGo to next message
Yeah Perhaps except I have 2 2T Blocks and it is heap cheaper to bore and put new pistons in than to get a 3T block or modify the 2T block for a 3T cranks as well as the fact that Longer stroke=slower revving while bigger bore and short stroke means fast revving and Maybe broken conrods.
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Norbie
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Brisbane
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May 2002
Re: 18 R pistons Wed, 24 September 2003 02:31 Go to previous messageGo to next message
You can pick up a complete 3T for a couple of hundred bucks tops at the wreckers. Do you really think it will cost less than that to bore out your 2T with new pistons rings etc?

The 3T is still well oversquare so you won't have any problems revving it. I used to have one in my first TA22 and it would happily bounce off the redline all day.
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vin91
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Location:
Darwin
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August 2003
Re: 18 R pistons Wed, 24 September 2003 12:23 Go to previous messageGo to next message
Maybe a couple of hundred in southern states but there are none in the Northern territory Darwin, I have tried every wrecker in Darwin but no hope so my only choice would be to import one and that is expensive. There are only 2 TA22 Celica's in the wreckers, all others are RA series. There are not many T series cars up here at all.
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Norbie
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Brisbane
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May 2002
Re: 18 R pistons Thu, 25 September 2003 00:32 Go to previous messageGo to next message
3T's come out of T18's, not Celicas.
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vin91
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Location:
Darwin
Registered:
August 2003
Re: 18 R pistons Thu, 25 September 2003 04:54 Go to previous message
Thanks didn't know that, will look for a T18 in Darwin
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