Rb25 Powered Gq, Head Removal?

[zac320]

Hey guys i know its not a skyline but you guys will know all because after all its an rb25.

Well the car drowned(fully under water, dnt ask haha) had a snorkel but obviously not sealed. Motor had water in it and now it wont turn over fully, i put a wrench on the harmonic balancer nut and it will turn over to a point then i have to go bak the other way till it gets to the same point again. Also when i go to turn it goes soft hard soft hard, i thought with the spark plugs out it would be all the same resistance? Have i bent the rods?

Im half way in removing the head, nearly at the stage of undoing the head bolts. So i will know more tomorow.

Its an S1 RB25 BTW, i might have to do a rb25/30.

For those reading thanks for your time as i know its not a skyline

Zac

Edited August 20, 2012 by zac320

[The Dan]

Remove spark plugs and crank it over to get the water out?

Then drown it in WD40 and repeat

[zac320]

hey mate ive already removed plugs and it wont crank over fully mate

[The Dan]

Then you probably have internal damage. I would say bent rod forcing a piston against the cylinder wall

[GTR260]

She's buggered mate

[zac320]

Guys i know somethings buggered hence im taking the head off, just thought it might be a valve bent stopping it from fully turning over, if its the rods, ill get the head worked a bit and just throw a RB30 A6 bottom end in it. Looks like its a pretty straight forward conversion

[The Dan]

It can't be a bent valve from a hydraulic lock.

Refer 2 posts up

[zac320]

really? Sorry mate someone has told me that even with a bent rod it should still turn over, so i just assumed valve because i know these arnt free flowing.

Rb30 here i come haha. Can i use the rb25 ecu with the 30 bottom end?

Thanks for the replies

[kitto]

New long motor, throw it in, done.

[zac320]

rb30 but yeah? no point putting in a 25 bottom end when its a pretty simple swap aint it?

[zac320]

Hey guys got the head off today, what should I do to the head while it's off? Like I might aswell do it up abit. It looks like cyl 3 and 4 have bent rods, so instead of doing the 30 bottom end I'll see if I can source some cheap rods, does anyone have some laying around?

Cheers

[GTScotT]

try get a running motor. pulling the motor appart will cost you a motza to do it right. you cant put a RB30 straight in as it will need an ecu and tune at a minimum.

2nd hand motor, pop it in, rock on out.

[GTR260]

Do the rb30,

[zac320]

Yeah but the easiest thing to do is just put 2 new conrods in, take sump off and undo 4 bolts and there out, then the head just goes straight on and hook everything back up, then I can build up the rb3O I got

[zebra]

errrm

I highly doubt the bores will be very healthy

[34GeeTeeTee]

Old 253's and low tech stuff may be that simple but i cant see an RB25 being that simple due the clearances etc........But hey, prove me wrong Good luck either way.......... 2ND hand motor seems the simplest!

[urtwhistle]

if yours only takes 4 bolts then I think its missing the cradle also lol. I think its gonna be a LOT cheaper to swap the whole block out in 1 go. rather then pull it apart

[zac320]

Bores fine mate? Not a mark or score. Well I recon ill just re ring the 30 bottom end and put that in and get new valves springs for the head?

[zac320]

Okays guys well because my patrol had a RD28TD in it the rb25 swapped straight over, well im picking up a rb30 N/A engine for pretty cheap, i dunno whether to just re ring it and new big end bearings because that can be done pretty cheaply. Or just throw it in and boost it and buy a bottom end thats been done already when one comes up for sale? Also what should i get done to the head? Its had new coil packs but ive heard there no good and i should use spitfire ones? Also i know ill need a new ecu so whats the best bang for bang so i can look out? At the moment it just has a 25 ECU but it would be waterlogged.

Thanks again.

[kitto]

Set yourself a budget and work from there. Seriously.