Rb30Det, Head Gasket Blown Between Cylinders?

[nicksamaniac]

Don't listen to the knockers. I fitted a turbo to an efi patrol. AFRs were fine up to 6 psi. Like has been said let the AFM do the work for u. Horses for courses....

This is actuall In a patrol aswell!

My first 30 powered gq I fitted vl na injection, ran it at 5 psi on the na tune,

then got rb20 injectors and a vlt tune at 10psi. Was pretty good truck.

then got this gq, straight lpg rb30,

that was a rubbish setup, always out of tune on the wideband, made 75.6hp atw!

Now it's an rb25/30det on fuel.

I love blasting uphill past Lexus/cruiser 200 series, prados, pajeros and new patrols!

[nicksamaniac]

The offending gasket and an engbay shot when it was first done, looks a tad dif now.

Specs - home made top mount manifold, Chinese t04e turbo .63 rear, .50 front.

50mm external gate, 3" mandrel exhaust, 3" cat, muffler, and 18"x3" resonator .

2.5" cooler pipes, 600-300-75 front mount, throttle body moved to front,

Massive intank pump -1l surge -044 external pump, (constant 12v supply controlled on/off by ecu)

pretty standard rest of setup, stock r31 block, r32 na 25 head untouched (hence the 20 style inlet)

standard tune.

Edited January 4, 2014 by nicksamaniac

[Simon-S14]

Looks like detonation caused that HG to blow out

[nicksamaniac]

Well yeah, as I had to limp it 350km home when it happened, it would've continued to push through the void into the next cylinder, back and forth.

it wasn't so bad to start with but she was pretty unhappy by the time I got home!

love my Nissan, far from stock, still it'll keep on goin till the end just to get me home.

couldn't do that in a landcruiser!

Edited January 5, 2014 by nicksamaniac

[Simon-S14]

yeah the rb30's take a punishment.

BTW the OEM headgaskets are the best to use on a budget. those cheap fibre ones from ACL or whatever are junk

[StevenCJR31]

Well yeah, as I had to limp it 350km home when it happened, it would've continued to push through the void into the next cylinder, back and forth.

it wasn't so bad to start with but she was pretty unhappy by the time I got home!

love my Nissan, far from stock, still it'll keep on goin till the end just to get me home.

couldn't do that in a landcruiser!

Ive had an engine do that, it had started to cut a groove in the head where the gasket had gone

[nicksamaniac]

Update, dropped the head off today for a rebuild, $650 for the full treatment. Deck the face, cut and grind all valves and seats. Pressure test and chem clean, and fully reassembled.

[nicksamaniac]

Well another update, got the big girl back together, gave it a rebuild while it was out,

-Acl race series main and big ends.

-Hastings moly rings.

-Mls-r head gasket.

-Fully rebuilt head with gtr valve springs. And other bits as required!

[nicksamaniac]

Few pics of the process-

Edited January 22, 2014 by nicksamaniac