Rb20e Not Reving

[who's next]

I have a cefiro with a rb20e engine, the head gasket blew and when i pulled off the head it was in a bad state. I purchased a rb20e (carb) head and block, took off all my parts and put it on to the new head and block (converted it to fuel injected, so i used my distributor, air intake etc.) set the timing to tdc, at first it would not start so pulled of my injectors cleaned and reinstalled, it starts and idles at about 500rpm however when i put my foot on the X to rev it i get no response, it feels like its going to cut off and when i remove my foot it picks back up. any ideas?

[Nic_A31]

Running in 3 or less cylinders

Bad Fuel

Timing

Air Flow Metre

Get a DE atleast mate then boost.

[sh@un]

TPS working properly?

[TurboX]

If it goes better when you back off from WOT then it means possibly that your AFR is out. Probably the timing as well.

You would have to assume that if you have replaced a faulty Head/Block with OK replacements,

and your bolt ons were running ok with your old Head/block prior to the faulty head problem,

then somehow your fitting of the items causes the engine to not start.

This could include the cam timing setup as well as the possibility of air leaks causing AFR problems.

1. RECHECK TIMING

2. CHECK for AIR/VACUUM LEAKS

3. CHECK FUEL DELIVERY & PRESSURE

4. CHECK SPARK

[who's next]

thanks guys

i would run back over everything and make sure it was hooked up right, quick question is there any way to test these sensors? before i look to buy replacement parts, the car was down for over a year

[daisu]

I was not aware of any RB20 heads with carbuerettor. Are you sure it's not an RB30 head?

[Nic_A31]

RB24S .... 2.4 L SOHC Carby RB...only sold in indonesia I think, where the left hand drive Cefiro's were sold. A Few have made their way to NZ and Aus.

Maybe one of those? or a 30 head?

Edited November 8, 2009 by Nic_A31

[who's next]

the block had rb20 as part of the engine number, the head looks like the ones that came on the rb20et. The block also looks different than mine in that it looks stronger, now in trinidad the a31 were sold new as the altima which came with rb24 single cam carb., this engine was bought from a foreign used dealer who imports used parts from japan, so i am not sure if thats how it came stock.

[Nic_A31]

Probably 24 heads...and your problem, heads and block having timing trouble.

Check out what all the guys suggested, if it's still not fixed, engine swaps are f**kin easy on these things.

or even strip out the bay down to the block, and go DET heads and loom.

[kamakazi]

hey man where abouts r u if u in perth i got a free rb20e u can have came outta one of my old cefs

[who's next]

Hey, thanks for the offer but I am way on the other side of the world in the Caribbean. Trinidad to be exact. I'll let you guys know how it all turns out.

[daisu]

An RB24S uses the same head as the RB30 (they have the same 86mm bore) the RB20 has a smaller bore (something like 79mm?)

[who's next]

so do you guys think the engine i bought came so (stock) or is it something someone put together in japan before being bought to sell over as foreing used parts?

[daisu]

Sorry, I just reread the first post.

I thought you had bought a replacement head and put it on your existing block.

Just to clarify, You originally had an RB20E (fuel injected) and you bought a replacement motor which was carburettor.

Then you swapped all of your EFI stuff onto the replacement motor.

As far as I understand, RB24S and RB30S were the only carburettor RB engines. So I'm guessing that maybe you were sold an RB24S.

Although, you also said that the block has an RB20 engine number..... can you double check that?

[Sarumatix]

After some searching I have found nothing relating to RB20S's. However the wiki article makes reference to a common mod being to put the a DE head on but retain the carbys for an RB24s. Perhaps you have an RB24s in disguise with an RB20DE head on top? or perhaps just an RB20e head? odd thing to get though .

Quick edit: can't be a 20 head on a 24 because they are incompatible.

[who's next]

Daisu you are correct, my original engine was fuel injected, but it was hard to find a replacment one in good condition. this guy who i have bought engines in the past said he had a rb20 but with carb. and all i needed to do was use back my intake system along with the distributor. the engine was in good condition so i took it. on the block the engine number starts with RB20, i even took of the carb. myself, so it came like that from japan. now the tapit pan cover is shaped like the ones you find on the rb20ET. Based on what you guys are saying (that rb carbs mainly came on the rb24s and rb30s) so i am guessing that the person who had it in japan did a mix and match meaing put a 24 or 30 head on the rb20 block, If this was done to gain HP i don't know. I have tried to research the rb20 carb on the net but came up empty. The block is also different than my orig. one. it looks stronger, there are ribs on the side roughly where each piston chamber starts and finishes (like the rb30 block or even rb20ET) here are some pics

Edited November 9, 2009 by who's next

[Conrad 2NR]

Man, please don't tell me you have a RB30 here in T'dad. I'll take it off of you!

You could have my engine for cheap and use back your old head. Only the lifters were beginning to make noise on my RB20E.

[who's next]

i wish, nah ifeel its a 24 head or 30 head they put on a 20 block, why i don't know, but its going by the mechanic on wednesday i fedup trying and with no luck, so i would let him sort it out, so lets hope