GOLD_JET Posted September 26, 2007 Share Posted September 26, 2007 hey guys looking at a new car. guy said it has an rb25 in it but im not to sure. what are the visual differences between an rb20 and rb25. it has no coil pack cover and the timing cover dosnt say anything? any help would be great. cheers Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/ Share on other sites More sharing options...
Cubes Posted September 26, 2007 Share Posted September 26, 2007 If its the R32 RB25DE then there's no way you can tell the difference without pulling the motor apart. They look 'identical'. Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3375527 Share on other sites More sharing options...
blind_elk Posted September 27, 2007 Share Posted September 27, 2007 Turbo or N/A? Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377016 Share on other sites More sharing options...
funkymonkey Posted September 27, 2007 Share Posted September 27, 2007 reach down the side with a flashlight and read the engine block number? should tell you if its a 20 or a 25. Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377036 Share on other sites More sharing options...
blind_elk Posted September 27, 2007 Share Posted September 27, 2007 On a RB25DET, the hose joining the 2 rocker covers points forwards. Also, the hose to the PCV valve is smaller, and comes out the side of the driver's side rocker cover. On a RB20DET, the hose joining the 2 rocker covers points backwards. And the hose to the PCV valve is larger, and comes off the top of the driver's side rocker cover. And, yes, the engine number should have the engine designation (RB20, RB25) as the first characters. Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377250 Share on other sites More sharing options...
MZTRBO Posted September 27, 2007 Share Posted September 27, 2007 A rb20det and a rb25det have different plenums...The rb20 is much rounder and longer, where as the rb25det is much shorter. Cheers Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377512 Share on other sites More sharing options...
Cubes Posted September 27, 2007 Share Posted September 27, 2007 Unless its an R32 Rb25 then it looks identical to the rb20. Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377515 Share on other sites More sharing options...
MZTRBO Posted September 27, 2007 Share Posted September 27, 2007 Oh my bad, just took rb25 engine as rb25det. So how does the N/A plenum look on a rb25de (r32 series), Im taking its identical to the rb20det plenum. Cheers Link to comment https://www.sau.com.au/forums/topic/186911-visual-difference-between-20-and-25-heads/#findComment-3377523 Share on other sites More sharing options...
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