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Location:
Melbourne
Registered:
July 2002
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Location:
Brisbane
Registered:
May 2002
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Re: Stroking 18r.. can it be done easily
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Thu, 10 April 2003 07:50
 
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Yes, you can use a 20/21/22R crank in an 18R block, but some machining is required to make it fit. It has been done before.
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Location:
Melbourne
Registered:
July 2002
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Re: Stroking 18r.. can it be done easily
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Thu, 10 April 2003 23:01
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wicked
cheers,
do i need to use the 20/21/22R rods and pistons too, or can i get away with just using the crank??
What would that stroke it out to?
Anyone know what machine work needs to be done??
i'd assume the bearing lobes or something like that??
cheers,
marki
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Location:
Brisbane
Registered:
May 2002
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Re: Stroking 18r.. can it be done easily
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Fri, 11 April 2003 02:57
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You'll definitely need different rods and possibly pistons, but I don't know the specifics sorry. If you can find the specs for the 18R and 22R you should be able to figure out what needs to be done. As for machining, I believe the block has to be machined to clear the crank counterweights, but again I'm not 100% on the specifics. Any machinist should be able to figure it out for you anyway.
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Location:
brisbane
Registered:
March 2003
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Re: Stroking 18r.. can it be done easily
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Sun, 27 April 2003 11:51
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oo oo i know this one...... you can bore an 18r to a 2.2 safely meaning you can use the 20r pistons then you can stroke it using the 22r crankshaft but you have to machine the crank in 3 places to fit to the 18r block.. it is alot of money involved but it is well worth it in the end.. it is a huge power gain.
that will bring it out to 2.4 ltr's from the 22r crank.. i am pretty sure you can use the 18r con rods as they take the same con rod bearings as the 22r but the 22r's use different crank and main bearings thats why you have to machine the crank to suit. they have slightly bigger diameter main and crank bearings.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Stroking 18r.. can it be done easily
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Sun, 27 April 2003 14:31
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if you were boring out the cylinders, and used a lower compression piston, would it not be defeatist?
i mean, going from a 9.7:1 piston from the 18R-G down to a 8.5:1 (pulled a figure) for the 20R, would that not almost lose the power before you gain it in some sense?
I realise that boring would increase toqure, but wouldn't it be far MORE beneficial to maintain a similar compression ratio?
Im just wonder guys... no criticism of what you are doing here of course! 
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Location:
Brisbane
Registered:
May 2002
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Re: Stroking 18r.. can it be done easily
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Sun, 27 April 2003 23:25
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I have spoken to a couple of people who have built 2.4 litre 18R-G's, and in their opinion the gains simply aren't worth the effort involved. You'd get much better results for less effort and cost by slapping a turbo on a stock 18R-GU.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Stroking 18r.. can it be done easily
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Mon, 28 April 2003 05:58
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thats what i wanted to hear from you norbie!!
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Location:
Brisbane
Registered:
May 2002
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Re: Stroking 18r.. can it be done easily
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Mon, 28 April 2003 11:33
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Why are you sitting in front of your PC when you should be putting a turbo on your 18R-G? Go outside and do it now!! 
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Location:
brisbane
Registered:
March 2003
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Re: Stroking 18r.. can it be done easily
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Mon, 28 April 2003 12:04
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i would except that the 18rg isnt even in my car yet i stil godda do a few little things to it bfor i put it in
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