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**my Rb20det Rebuild Questions Advice Needed**

mattR32gtst

By mattR32gtst,
in Engines & Forced Induction

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mattR32gtst Explorer

mattR32gtst

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Posted

Hi everyone ill try and keep this short.

Iv been running my rb20det for 6 months at the final map of 402bhp fly and 375lftb.

On attending a drift day at one of the bigger tracks ready for next years competition season to start i developed a knocking noise, it was then deemed to be bottom end :happy: .

So... i want to rebuild the 20 ( no i dont want to go rb25 before anyone says it will save money )

so as you guys down under seem to be pretty keen on the rb20's what info and sources can you give me on getting uprated parts for decent money as no wear in the uk supplies such things.

Im talking forged pistons & rods etc...

any help and input appreciated

BlueRB240 Collaborator

BlueRB240

Posted
Posted
Hi everyone ill try and keep this short.

Iv been running my rb20det for 6 months at the final map of 402bhp fly and 375lftb.

On attending a drift day at one of the bigger tracks ready for next years competition season to start i developed a knocking noise, it was then deemed to be bottom end :happy: .

So... i want to rebuild the 20 ( no i dont want to go rb25 before anyone says it will save money )

so as you guys down under seem to be pretty keen on the rb20's what info and sources can you give me on getting uprated parts for decent money as no wear in the uk supplies such things.

Im talking forged pistons & rods etc...

any help and input appreciated

Did u spin a rod bearing? You could try and find a good crank and add the oil pump collar and a oil restrictor to the head. Just throw in some new rings and bearings and be on your way. http://www.spoolimports.com/ sells forged rods and pistons for the RB20 if u want to go that route.

mattR32gtst Explorer

mattR32gtst

Posted
  • Author
Posted
Did u spin a rod bearing? You could try and find a good crank and add the oil pump collar and a oil restrictor to the head. Just throw in some new rings and bearings and be on your way. http://www.spoolimports.com/ sells forged rods and pistons for the RB20 if u want to go that route.

I havent taken it all of yet to see axactly what has happened.

sorry if i sound stupid here but whats an oil pump collar and oil restrictor to the head is it something to prevent oil starvation like the 26's suffer from.

Iv been reading lots of other threads about the 2. builds and im definatley thinking of doing the 2.2 which involves parts that are fairly easy to come buy .

boostn32 Mentor

boostn32

Posted
Posted (edited)

ive built a 20 that will be sure to produce the goods. there are so many ways people will tell you to go. i dont use the rods as mentioned above i dont use oil restrictors as that isnt the problem as every one thinks.

Edited by boostn32
AndrewJZX100 Mentor

AndrewJZX100

Posted
Posted

^ pretty sure not, but I'd love to know for sure as well cause my 20 is poo'd out and my mate has a 25de with a snapped cam that I'm currently in the midst of sourcing a head for.

If they fit that'd be great to know.

Roy Grand Master

Roy

Posted
Posted

I have been making about 425hp at the fly for a while now and the internals seem pretty happy. Before buying parts be sure to remove the engine and strip it down and make sure you know the root cause of your problem.

After stripping you may find that your pistons and rods are fine, but your crank badly damaged from a spun bearing. If thats the case then it would confirm what i suspect and thats the internals are ok for that power, but what you have to work on is the control of oil pressure, oil temperature and coolant temperature. You may find you will just as easily spin another bootm end bearing with a fully forged motor if you have not addressed oil presure and tempeature issues and made sure you keep coolant temp under control as well.

So the money you are about to spend on rods and pistons may be better spent on Tomei/Jun/Grex etc oil pump and better oil cooler setup

mattR32gtst Explorer

mattR32gtst

Posted
  • Author
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Cheers Roy some good advice there i must say i was planning on uprating the oil pump and also fitting an oil cooler.

does anyone know of what 4agze pistons i need or where i can get fully forged rb20det ones ???

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