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RB20DET Timing Problem

osiris23

By osiris23,
in Engines & Forced Induction

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osiris23 Rising Star

osiris23

Posted
Posted

Hey.

Well cracked a piston ring in my car so i ended up ringing around and found a mate with an RB20det head and bottom end cheap so i grabbed that.

Motor was from a late modle Cefiro 4WD auto.

Had to do a few little modifications like the sump but other then that we just bolted on everything from my old motor onto the new one and dumped her in.

The problem is that when it was all together and in everything wired up it would turn over but wouldnt start. Straight away started thinking timing but checked once, checked twice, checked 3 times and the cam gears where lined up with the factory marks etc.

Next, tried moving the crank angle sensor around but still wouldnt work, un did the bolts off it and moved it around more and it did start and was running fine. Problem is that where it is to be running is around so that the crank angle cannot be bolted down in the correct holes..

So obviosuly something somewhere is not lined up correctly..

The guy whos doing the motor swap just asked if i can manage to find a picture of the cam timeing marks or something which can help him..

Alternatly does anyone know what could be wrong? Where useing the Crank angle sensor off my old RB20 if that would matter at all?

Could the cams be different to the ones from my old motor?

The old motor was from a R32 GTST im pretty sure so yer is there any difference..

Please can someone help with ideas or hopefully know whats going on??? :D

Cheers :(

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https://www.sau.com.au/forums/topic/82152-rb20det-timing-problem/
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Cubes Grand Master

Cubes

Posted
Posted

Check the cam timing..

Different cams won't cause it not to start. Hell the stock ecu ran the rb30det in fine and that was running a rb25 head with different cams, bigger valves and bigger ports. :D

I'd be inclined to say the cam timing is out.

Its very simply to do.. Line up the crank at TDC then the both cams at TDC.

If the dude doing the engine swap can't find the marks or doesn't know where to look I would seriously doubt is ability. :(

osiris23 Rising Star

osiris23

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Posted

nah he has everything lined up, the cam gears are lined up with the marks on the plastic back part and he said the cams are lined up as well... Hes going to work on it again tomorrow and said it should only be about an hours work but i thought id ask on here anyway...

would it have anything at all to do with useing the crank angle sensor off the other motor? i would say not but just to be curious???

My car has an EMS computer as well if thats anything to do with anything??

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