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Rb20det Knock Diagnosis - Video

foodie

By foodie,
in Engines & Forced Induction

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foodie Newbie

foodie

Posted
Posted

Hey Guys,

Great forum and I am sad to say that my first post is a question of which I rekon I already know the answer but am after some direction from any RB20det owners.

Below is a video of my beast idling and you can hear a dead set knock of death.

The car is a datsun 260z and I am looking at getting about 300-320rwhp reliably.

Mods so far

IC

microtech ecu

t3/t4 turbo

soon. supra injectors

fuel reg

larger fuel pump (if needed)

Question: Should I just pull the sump off and replace the busted bearing (if thats all it is) or would the RB20det need new pistons, rings and a clean up to acheive 300-320rwhp reliably?

I have no idea on how many K's the engine has done. Conversion was done in 2005 and hardly any miles put in it since then.

Thanks for your time.

shit, the video link -

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https://www.sau.com.au/forums/topic/185375-rb20det-knock-diagnosis-video/
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Green_s13 Proficient

Green_s13

Posted
Posted

yes that does sound like bearings, i personally would rebuild the thing while you are at it, the motor might last a few years with that power or could last a few days, all depends on the condition of the rings and ring lands.

Simon-S14 Grand Master

Simon-S14

Posted
Posted

you COULD just replace the bearings, but keep in mind that they dont start knocking for no reason... something have starved them of oil so if you go down that path its most likely going to do it again. You oil pump could be on the way out or you could have other issues.

Personally, i would just get another good con bottom end 2nd hand and wack it in and thrash it

foodie Newbie

foodie

Posted
  • Author
Posted

Wack it in and thrash it! I love it!

Any tips on where to look for rb20 bottom ends? Apart from here, ebay and other forums.

I see some rb25's complete for like $1500 - maybe I should search on exchangability of parts and just step upto one of them.

foodie Newbie

foodie

Posted
  • Author
Posted

Lifters are the higher pitch ticking which goes away once the oil pressure goes up. Well mine do.

Sent a dozen e-mails to some wreckers on quotes. rb20's seem to be cheap!

Pistons etc seem overly expensive for what an entire motor is worth. any OEM suppliers out there?

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