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 Post subject: J18a or J20A converted to 2.3 90mm bore
PostPosted: Thu Oct 11, 2007 12:08 pm 
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Has anybody looked at changing the bore on a J18A or J20A to the same 90mm size of the 2.3? I don't have access to a 2.3 engine but was wondering if it is possible to do this.

The pics are of a 2.0
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J20ABlock1sml.jpg [ 106.67 KiB | Viewed 284 times ]


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 Post subject:
PostPosted: Sat Oct 13, 2007 6:55 am 
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I emailed LA Sleeve with the pics of the block and what I wanted to do and I just got a reply back.

"We haven't made a performance sleeve for the Suzuki yet but it looks possible. Looking at the picture you emailed, it seems to me like it would be simular to the Honda's we make sleeves for. We would make the flange bigger than the waterjacket. Usually 1.500" down on the flange. Then, the outer diameter would taper down below that. It would press on that area of the sleeve. Depending on what aluminum is left between each bore is what determines your press fit. The average press fit is .001 to .002. Let me know if you've any other questions."


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 Post subject:
PostPosted: Sat Oct 13, 2007 10:04 am 
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Looked into it but it's very risky, very expensive without knowing what the outcome could be. I had the ports reinforce welded to prevent movement under boost. J18 has a weaker crank compared to the j20 (don't ask me why).


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PostPosted: Sun Oct 14, 2007 11:10 pm 
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I was looking into using the J23 crank in a J20 block. I still can't get any definite answers on what the specs are for the J18, J20 and the J23.
Ie difference in rod length, crank differences and if the blocks are different betwenn all three.

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 Post subject:
PostPosted: Mon Oct 15, 2007 6:33 am 
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Given that the J20A and the J23A both have the same 90mm stroke and piston pin I'm not thinking about swapping cranks although it wouldn't be a bad thing to have it all balanced with the larger pistons.


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PostPosted: Tue Oct 16, 2007 12:11 am 
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OK, so can you answer these questions for me.

1. What is the bore size for all three motors?
2. You say the J23 and the J20 have the same stroke, can I assume that the rods are the same then?
3. If the stroke is the same on the J23 and the J23, can I also assume the crank is the same and the extra capacity is only in bore size?

thanks

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 Post subject:
PostPosted: Tue Oct 16, 2007 7:13 am 
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Bore x Stroke, Comp ratio, Power, Torqe

J18A 84mm x 83mm, 9.8:1, 89kW@6200rpm, 152Nm@3400rpm

J20A 84mm x 90mm, 9.3:1, 97kW@6300rpm, 166Nm@2900rpm (Vitara)or 94kW@6000rpm, 174Nm@2900rpm (Gen 1 Grand Vitara)

J23A 90mm x 90mm, 9.3:1, 116Kw@5400rpm, 206Nm@3000rpm

It is my understanding that the basic crank is the same between the 2.0 and the 2.3 but that the 2.3 may have a slightly beefier rod.


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PostPosted: Mon Oct 29, 2007 6:42 pm 
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So from these figures you are wanting to use the J18 crank and the J23 pistons in a J18 Block. You would have to get the block "sonic tested" to see how much the bore can be bored out safely.

Looking at your figures, I have a J20 and if that could be bored out to fit the J23 pistons, then that would be a good way to go?

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 Post subject:
PostPosted: Mon Oct 29, 2007 10:22 pm 
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I have a J20A and I'm trying to work out the feasibility of making it effectively the same capacity of a J23A by increasing the bore. Adding some pistons that would give something like a 10.5:1 comp ratio would be icing on the cake.


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PostPosted: Tue Oct 30, 2007 3:01 pm 
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cj_zuki wrote:
I have a J20A and I'm trying to work out the feasibility of making it effectively the same capacity of a J23A by increasing the bore. Adding some pistons that would give something like a 10.5:1 comp ratio would be icing on the cake.

Ok, we're on the same mission. I also have a J20 and was asking if it is just a simple matter of fitting the bigger pistons (if the bore allows for the extra size) to get to 2300cc. I was wondering if the crank was any different, but looking at your figures, the stroke is the same, so a good chance it is the same.
There is not much info on these motors is there?

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PostPosted: Tue Oct 30, 2007 3:32 pm 
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The 2.3 crank has a different part number but I believe it has slightly better rods. Any difference in manufacture will change the part number. Whether the rod length and piston compression height are any different is unknown but the stroke is the same so with the same bore, the capacity will be the same. Getting pistons and sleeves are all relatively easy but the unknown for me at this stage is can the block take the larger sleeves without issues.


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PostPosted: Tue Oct 30, 2007 7:49 pm 
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Definately has to be sleeved, and would probably be better for a n/a application. You guys got me interested in this so now I asked again about doing it, they said 6mm is a lot, better to go from 84mm to 87mm they also suggested honda rods and pistons. Will keep you guys posted.


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PostPosted: Wed Oct 31, 2007 8:47 pm 
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These guys onthe Arieo website have some info on the Jseries motors...
http://www.aeriostyle.com/forum/index.php

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Sat Jan 03, 2009 3:18 pm 
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another thread rebirth!

Bore x Stroke, Comp ratio, Power, Torqe

J18A 84mm x 83mm, 9.8:1, 89kW@6200rpm, 152Nm@3400rpm

J20A 84mm x 90mm, 9.3:1, 97kW@6300rpm, 166Nm@2900rpm (Vitara)or 94kW@6000rpm, 174Nm@2900rpm (Gen 1 Grand Vitara)

J23A 90mm x 90mm, 9.3:1, 116Kw@5400rpm, 206Nm@3000rpm

in theory, i could use combination of the J20A pistons and the J23A crank or J20A pistons and crank IF i have enough room for Stroke in my J18A, right?

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Thu Jan 22, 2009 8:20 pm 
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I think we've all given up!! :(

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Sat Mar 07, 2009 3:44 am 
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Why didn't anyone mention the easy one. J18 pistons into the J20 for higher comp. :lol: Also, my understanding is using the J18 head on the J20 would work as well. According to a mechanic in Greece. But I would think the timing is better on the J18 ECU for the higher comp, so possibly a better idea to go with the J18 ECU if your running the higer comp J20.

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Fri May 01, 2009 9:05 pm 
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It wouldn't work the bore is what determines the 1.8 2.0 etc the stroke always stays the same,
the 1.8 piston will be too small for the ports in the end you will still need custom pistons.

Ivé gone 87.5mm that has given me a 2.2lt, but I've had to sleeve and block guard the engine.
In the end like Subaru engines it's best to leave as much meat on those ports as possible thats why I believe a well built turbo j18 would be quite tough just make sure you stick a solid j20 crank in.

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Fri May 01, 2009 11:07 pm 
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But the bore is the same on the J18 and J20. What do you mean?

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Mon May 04, 2009 11:17 pm 
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I went and had a look you might be right that crank stroke looks like 84 but the j18 crank is still a piece of crap compared to the j20.

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 Post subject: Re: J18a or J20A converted to 2.3 90mm bore
PostPosted: Tue Dec 14, 2010 1:18 pm 
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I have a j18a 2.2..... I use j20a stroke 90mm and 84mm bore with stoke bore b20b honda piston.... That gave me a lot of power...


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