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Location:
Launceston, Tasmania
Registered:
May 2002
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18-RC to 18-RG
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Wed, 19 June 2002 00:40
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I am planning to replace my 18-RC (currently in RA40) with an 18-RG. I have been told that is is possible to convert an 18-RC in to an 18-RG by replacing the head, pistons, chain etc. I have found somewhere to get the head cheep and have been told that the pistons are only $107. If i was to only get the head and the pistons would that give much of an advantage over the standard 18-RC? anyway, what are peoples opinions on this.
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Location:
Newcastle
Registered:
May 2002
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Re: 18-RC to 18-RG
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Wed, 19 June 2002 01:02
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Cam i think you would be much better off just buying an 18R-g
the parts for these motors are very hard to get. i have just finished rebuilding my 18R-GEU and it was a real pain ib the arse you also have to think of how long your car is gunna be off the road when you have to wait a couple of weeks for a part. there are other small differences too. you need a new timing chain cover. rods are different from an 18R-c (18R-GEU ones are anyway. and while you are replacing all that you may as well do a full rebuild. so it would be eaisier on yourself to jsut buy the motor outright. i think there are small differences in the oil pump shaft.
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Location:
Brisbane
Registered:
May 2002
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Re: 18-RC to 18-RG
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Wed, 19 June 2002 07:57
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Way, way easier to buy a complete 18R-G and drop it in. It's theoretically possible to build a twincam 18R-C using parts from the 18R-G, but it's a big job and basically not worth it.
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Location:
Penrith
Registered:
May 2002
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Re: 18-RC to 18-RG
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Wed, 19 June 2002 12:33
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I agree with them. There are other differences such as the exsillary (sorry about the spelling) shaft is longer with a gear to drive the dizzy out of the timing chain cover, the oil pump in the 18rg is a high volumn compared to the 18rc, the pickup in the sump is different, as well as the baffels, then you will need to get carbies and manifold, or EFI and exhaust, as well as some chain guides. If you had done this before it would be to bad!?! I'd buy a complete 18RG. Good luck.
Mark
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Location:
Launceston, Tasmania
Registered:
May 2002
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Re: 18-RC to 18-RG
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Wed, 19 June 2002 23:10
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yeah i thought it would be a better idea just to keep looking for a complete 18-RG but it was worth a try  thanks all!
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Location:
Western Sydney
Registered:
May 2002
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Re: 18-RC to 18-RG
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Thu, 20 June 2002 10:25
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What's the difference between the RC and RG rods? Currently my RG uses an RC bottom end, so when I put it back together, I want to make sure I'm using the best parts. I've got two sets of RG rods and pistons at home. Pistons aren't any good to me thanks to my massive cams though.
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Location:
Tasmania
Registered:
May 2002
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Re: 18-RC to 18-RG
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Thu, 20 June 2002 22:24
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What? Your 18R-G pistons are no good for big camshafts? Strange. Are you using 18R-C pistons now?
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Location:
Brisbane
Registered:
May 2002
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Re: 18-RC to 18-RG
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Fri, 21 June 2002 09:18
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Big cams tend to open earlier and close later, and also have more lift (ie push the valves down more than the stock ones). In some circumstances this can result in contact between the valves and the pistons. Obviously not a good thing! The solution is to have reliefs cut into the pistons to clear the valves.
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Location:
Western Sydney
Registered:
May 2002
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Re: 18-RC to 18-RG
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Sun, 23 June 2002 05:00
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The motor's dead at the moment. But it does have 18R-C pistons in it. After an incident with a loose cam bolt, all four inlet valves were bent, so there isn't much clearance there. When I pull it apart to find out why it died a couple of months ago, I'll be working out exactly how much clearance I have when the cam timing is set properly, so maybe I can run the RG pistons.
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