Bang For Bucks! What To Do!

[Oblivion]

Hey dudes and gals!!

I recently just find out that i have a minor knock in my rb20 at 3k-4k anything thing under is fine atm. (but still not driving it)

and i would like to know and to talk about what is the best way to go with what engine.

I could rebuild this and just replace the damaged parts for a few grand i guess..

i could buy another rb20 to put in and be unhappy with the car, and prop sell the car.

i could be a 25 and drop it straight in and hope like the other 20 that nothing goes wrong.

i could rebuild the 25 i have in my shed for anywhere between 4K-6K i guess.

or i could rebuild this 20 for the same amount.

I would like to know peoples views and ideas on this area.

Cheers.

no jokes just facts, post up some results if you have them from your own build etc.

[abu]

2nd hand RB20 motor, cost about $300 - $600?

If you get a good condition one it will last you for a while.

Otherwise if your not happy with the RB20, like your saying, just go with an RB25 like most others do, or if you want to be creative go an RB26?

Edited September 17, 2007 by abu

[abu]

But, if you want to spend that sort of money (4-6k for a rebuilding the RB25) you might as well do an RB26/30setup.

I'm sure you wont get bored of that.

Personally I would go for the RB30 bottom end if I was going to spend that sort of money. There not as expensive as people think they are. Should have a read through the thread.

http://www.skylinesaustralia.com/forums/in...showtopic=15420

Edited September 17, 2007 by abu

[BAMR33]

RB30 with 25de head would be the most feasible way making power without excessive amounts of work and extra parts. This option you can build the motor on the side and keep on driving your car right up until it's ready to go in. The rb30 bottom ends are fairly hardy so you may be able to get away with just new rings, bearing, water pump etc. just small inexpensive stuff.

The only problem with the rb30 conversion is the need for a stronger gearbox, which would probably be needed with a rb25 anyway. A New turbo will also be needed, so I suppose that's another cost to take into consideration.

[Oblivion]

thanks guys

yes i know the rb25/30 cost about the same amount to build etc....but it also sits higher in engine bay i dont want to get a modifed bonnet...so its out of the equation, but it would be nice.

abu: my 20 was supposed to last me a while yet, but stuff knows where this problem came from. i dont want to have to spend 600 on a 20 when it has a chance of buggering up, dont get me wrong i have owned my car with its 20 for 2 years now, and it has never missed a beat is always serviced, so still has me puzzled.

i not after an insanely powerful engine either, but weekend fun in the 20 has it limits and the small power it has i do not enjoy it anymore.

[TTT]

what is this knock?

only under load?

or even if cruising?

has anyone diagnosed the problem with the current engine?

I don't know if I'd go jumping in to new engines and rebuilds etc before getting a professional opinion.

if you are tight for cash, I'd either fix what is broken or get a replacement rb20, then strip and sell your current one.

use the money from that for new turbo, injectors, pump and remap.

I don't see why you would be unhappy with it after that.

[Oblivion]

what is this knock?

only under load?

or even if cruising?

has anyone diagnosed the problem with the current engine?

I don't know if I'd go jumping in to new engines and rebuilds etc before getting a professional opinion.

if you are tight for cash, I'd either fix what is broken or get a replacement rb20, then strip and sell your current one.

use the money from that for new turbo, injectors, pump and remap.

I don't see why you would be unhappy with it after that.

yes i went and saw a mechanic last night and he went over it.

the knocking starts at about 3 - 4K on the rev range and continues up, i personally has checked and rechecked for loose bits and vibration bits and i cant find shite.

i do have a 25 block and head sitting in my garage atm. so i dont know whether to sell that and fix and mod the 20 or the sell the 20 and fix and mod the 25. basically.

the car atm has a chip and remap, and fuel pump.

[TTT]

how many monies do you have to spend?

[Oblivion]

at the max 6k, but i dont really want to spend that much.

[TTT]

I would:

get another RB20 and have it put it.

Strip your Broke RB20 for parts and advertise here.

strip the RB25 bits you have and sell for parts here.

you will have got your car back on the road and MADE money.

which you can use for turbo, injectors and rechip.

[Oblivion]

ok Cheers

you have me thinking.

[TTT]

yeh.. I always tend to come up with great tightarse options.

[Oblivion]

yeh.. I always tend to come up with great tightarse options.

:laughing-smiley-014:

got me stuffed to know why you would though

i wont be doing exactly what you said...but the 20 i will be selling though.

[assyrian4evaa]

personally i'd sell of anything to do with the 20 and rebiuld the 25 after all it will make more power with a standard rebiuld

or maybe go for the Tomei 2.8 stroker in the 25

[SiR_RB]

2.8 stroker for rb26 isnt it? not 25

anywhos, i'ld do a basic rebuild on the 25 and chuck that in along with a 25 box

[assyrian4evaa]

2.8 stroker for rb26 isnt it? not 25

anywhos, i'ld do a basic rebuild on the 25 and chuck that in along with a 25 box

yes but can be used for the 25 also

RB28

[Grunter]

That's one thing I can't wait to see people fitting

Tomei 2.8 strocker kit's in there RB25.Wonder

how long before that is the new trend???

[Oblivion]

im too poor to start that trend sorry!! lol

yeah anyone want some rb20 parts...there is nothing wrong with it honest!!!

but seriously anyone...make me a resonable offer...chiped and tuned ecu...newish coils.

[R34GTFOUR]

that sounds very much like a big end knock

if i was you i would get a set of big end bearings and wack em in there (wouldnt be much more than a 100bucks) as long as it hasnt been knocking for long otherwise its probably scored the crank or rod cap.

or

go out get standard rings and bearings and give the whole engine a freshen up, if you do the work yourself it wont set you back more than 500bucks for parts including a gasket kit and as long as the engine isnt pumping rediculous amounts of hp it should be very reliable.

or

if you have a rb25 in the shed i would use it, but thats just me

[Oblivion]

that sounds very much like a big end knock

if i was you i would get a set of big end bearings and wack em in there (wouldnt be much more than a 100bucks) as long as it hasnt been knocking for long otherwise its probably scored the crank or rod cap.

or

go out get standard rings and bearings and give the whole engine a freshen up, if you do the work yourself it wont set you back more than 500bucks for parts including a gasket kit and as long as the engine isnt pumping rediculous amounts of hp it should be very reliable.

or

if you have a rb25 in the shed i would use it, but thats just me

cheers for the ideas.

wouldn't a big end knock happen all the time?

i was considering rebuilding but have only just thought of something else, a while ago i was noticing the oil pressure was dropping, but when i turned off and started it again it would go back to normal...i would go for a drive and keep it below 4k, but if i'd rev it out it would drop again...again stop the car and start it again and it would be fine. the light never came on, so i thought i must be dodgy P/S. and i didnt think anything of it.

but that has passed.

So say if i were to use the 25 how stoopid should i go with it?

say for 350HP

cams?

forged?

head work?

shot peening?

and what turbo would be good for a response build say full boost by 3k?

cheers.