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Location:
Rocklea qld
Registered:
February 2003
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rc crank same as rg??
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Sat, 12 February 2005 11:50
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im currently just building a 18rg from some left over gear i have and i had a complete block with some gear on it and crank already installed but it had no pistons...ive fitted some rg pistons but as soon as i tension up the pistons the engine jams up. is it possibhly the bottum end i have used has a rc crank in it. does the rc crank have smaller bearing journals then the rg and thats why the rg pistons are grippingh on the edge of the rc crank??? if that makes senser
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Location:
Adelaide
Registered:
June 2003
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Re: rc crank same as rg??
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Sun, 13 February 2005 05:40
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How about that, I had just tracked down the answer to that question and then I found this poor neglected post.
Answer:
18RG crank - Forged
18EC grank - Cast
So no, they are not the same.
Now I am just waiting for a reply on how to tell the difference.
This will have a fair bearing on my plans and coonfidence as I'm pretty sure I have an 18RC block (dip stick in wrong place for RGEU), but I'm not sure about the rods and the crank.
I had a little trouble making sense of what you were implying here.
Pistons gripping on Crank? I don't quite understand what you mean.
Have you got the correct main bearings in there for the crank ad block?
The are more than one type of main bearing,
1. Separate thrust
2. Integral thrust
My brother's 18RGU uses an integral thrust bearing set
The first set we ordered were separtate thrust.
Depending on teh age of the block/crank, they require different bearings.
Hopefully you don't have an old crank with a new block or vice versa. If you have miss matched them it may not work.
I am unaware of any differences between 18RC and 18RG conrods other than the tightening torques, but there may well be.
I saw on an old post that CelicaRA45 was at some stage selling factory STEEL conrods for an 18RG.
Whether this means that the 18RG ones are forged and the 18RC ones are cast I have no idea.
If someone is able to clear up this issue I am sure we'll all be glad.
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Location:
Adelaide
Registered:
June 2003
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Re: rc crank same as rg??
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Sun, 13 February 2005 05:48
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Another thought-
Have you made sure that you've got matching bearing caps and rods?
Are the caps on the right way around compared to the rods?
This may make a fair difference to the engine being able to turn.
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Location:
Rocklea qld
Registered:
February 2003
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Re: rc crank same as rg??
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Sun, 13 February 2005 07:38
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i grabbed a block that had a crank in it already. when i put thge pistons in and do the nuts on the rods finger tight everything spins perfect and pistons go up and down. as soon as i do the rod bolts up to the tension everything jams up. ill try turning a rod cap around and see how i go but im sure there right. the marks are lined up. i thought the outside edge of the rg rod was gripping on the inside edge of the rc crank. but only when tensioned up
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Location:
Rocklea qld
Registered:
February 2003
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Re: rc crank same as rg??
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Sun, 13 February 2005 07:42
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PROBLEM SOLVED...turns out the pistons i grabbed and rods/caps have been marked wrong. sinstead of someone putting the marks on the rods and caps so they line up when u put it together they put them opposite so was going together wrong..
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