Piglet's Rebuild Of His Busted Tomei 2.8

[Piggaz]

Rightio guys.

Just a little build thread thanks to my oil pump destroying itself and taking my engine with it.

A little bit of history of how things were 6 weeks ago;

- GT block

- Tomei 2.8 (86.5 mm pistons)

- "Ported and polish head"

- Tomei Procams (270 @ 10.25mm)

- Garrett -5's with a slightly modified turbine housing

- Tomei Series 1 dumps

- Racepace Motorsport twin 3 inch from dump pipes back

- Link G4 ECU

- ID 2000 injectors

- Nismo 100 mm intercooler

- Nismo intake plenum

- Standard Airbox

- Ross crank trigger

That setup on Unigroup Engineering's dyno made 426 RWKW at 24 psi dropping off to 22 psi top end.

Dyno graph below:

OK, so onto the failure.

Oil pump into 9 pieces, lost oil pressure, Exhaust cam welded itself to a few cam caps and pistons and valves got a bit raunchy in the chamber. . The bottom end somehow survived! The engine was together for 7 years and just on 35,000 KMS.

Picture of the oil pump:

Drive of the pump.

All exhaust valves cracked

Uh huh Uh huh

Engine oil. Now with glitter and sparkles.

The valves. The "tapping" that shouldn't have happened

Big end bearings. Look good for the damage done!

OK. Enough of the destruction. Now the fix.

I decided to keep the 2.8 as much I wanted to go 3.0, I couldn't justify moving away from the 2.8 when it was all good.

Over the last 14 months I have been building a head at HKS Japan (Thanks Marcus for all those 2 hour talks and organising this for me). The guy that has built this head also ported the HKS drag R33 GTR back in the day.The spec of this head is;

- "port and polish" for engines up to 900 HP

- JUN Ti retainers

- 1.5 mm oversize valves

- HKS step 2 valve springs

- JUN 264 @ 10.5 mm cams. I was originally going to go with the Mines 252 @ 10.05 mm BUT I may run V-cam at a later stage. They recommend a 264 degree cam for 2530's/-5's, so the choice was made.

- The head also copped the full treatment from NAPREC. This consists of taking one of the squish pads out, reshaping the combustion chamber and decking the head 1.0 mm. (thats the short version of it)

I also had a set of standard manifolds ported to the head and sent a manifold to turbo gasket to Japan to get matched up. The other side a 'balance tube' was sourced (the bit between the throttles and the head) and matched that to the head also.

A few cheeky photo's of the head;

Pistons got ordered this arvo which are 87 mm Tomei pistons which will be valve recessed to suit the 1.5 mm OS valves. As soon as that is done they will be flown over so I can assemble the bottom end, then wait for this head to rock up.

- A racepace 9 Litre sump has been organised to be drained by a Tomei oil pump.

- My gearbox got a quick strip down, inspect and reassemble as we found 2 'locator pads' on the magnet.

- A Quaife front diff has been bought and is going in the sump/diff when I get it.

- Alcon 6 pot 365mm front/4 pot 350 mm brakes are on the car. I'll take some pics tomorrow and throw them up.

I was very surprised with the clutch and how it came out. Anyone that has seen me drive it knows the launches this thing gets. I have done 250 launches atleast since I have owned it and i'm just going to put it back in the car. Love those coppermix Nismo's .

[N1GTR]

Haha dont forget the "mmm whats missing...." pic

Also a hillclimb pic;

And a big smoky launch;

The aftermath of taking the engine out; (Yes, thats a GT block)

[zebra]

Put a shirt on paul

[levinboy]

That head sounds and looks paaaawwwwwnn

Where and how much you get the brakes??

Looking to upgrade soon

[GTRNUR]

Keen to see what changes you end up making Paul. Looking at the dyno sheet I should have taken you up on that test drive offer too.

How does the crank journals look? Considering the mains still look reasonable (despite particles), i'd imagine they look ok if the nitriding has held up.

Were you using cut back valve stem's? Just wondering what caused the valves to make contact... Did the belt slip too?

You didn't say what brand of pump that was either...?

[Piggaz]

Keen to see what changes you end up making Paul. Looking at the dyno sheet I should have taken you up on that test drive offer too.

How does the crank journals look? Considering the mains still look reasonable (despite particles), i'd imagine they look ok if the nitriding has held up.

Were you using cut back valve stem's? Just wondering what caused the valves to make contact... Did the belt slip too?

You didn't say what brand of pump that was either...?

If i wasn't so hungover and struggling from the previous nights stupid decisions I might have had a chance of giving you the keys. It also had no PS belt and on semi's... it was such a prick to drive around town!!!

Crank looks fine. It's polished up and will be reused.

Yeah the belt slipped when the EX cam siezed in the head. The pistons and valves had sexy time because the pistons were not valve relieved and the lift on the cams (10.25 mm)

It was an N1 pump.

It only had to last a few more months. I was going to change it when the head came (which is next month)

[tweety bird]

also keen to see.

[GTRNUR]

Yeah the lack of PS was the main reason I wasn't too keen.

Sucks the pump didn't survive. I don't think there is such a thing as luck with performance cars. You can just count on everything going wrong when you least expect it too.

[Piggaz]

That head sounds and looks paaaawwwwwnn

Where and how much you get the brakes??

Looking to upgrade soon

England I got them from. A bloke on the pommie site had them on special but have since gone back up. Landed they were about $6000 after getting raped by customs!

I'll post some pics soon.

[Piggaz]

Yeah the lack of PS was the main reason I wasn't too keen.

Sucks the pump didn't survive. I don't think there is such a thing as luck with performance cars. You can just count on everything going wrong when you least expect it too.

Oh well. Take it for a belt at this years nationals if you're coming down.

[levinboy]

England I got them from. A bloke on the pommie site had them on special but have since gone back up. Landed they were about $6000 after getting raped by customs!

I'll post some pics soon.

That's actually quite a good price for front and rears, cant wait to see them on the car

[Piggaz]

Front passenger

Same behind a buddy club QF

[bigmikespec]

Inlet ports look polished.

[Piggaz]

Inlet ports look polished.

Well its a carbon copy of Elrodeo666's head which was good enough for 445 kw at 1.4 bar on -5's.

[DaveO74]

Such a shame it decided to lunch itself Paul.

I remember seeing your ride at unigroup and having a chat to you about it. (I just finished my 33 and brought it down to show the boys)

The new setup sounds even more impressive.

[bigmikespec]

Well its a carbon copy of Elrodeo666's head which was good enough for 445 kw at 1.4 bar on -5's.

Must be ok then

[zebra]

Paul, what did you do with your old brakes? Weren't they big enough? lol

Cant wait to see this up and running again

[Piggaz]

Paul, what did you do with your old brakes? Weren't they big enough? lol

Cant wait to see this up and running again

Nah, couldn't stop the prick at Wakefield (braking before the kink and still having issues).

They went to Milano (Aggroman).

[mico]

why the hell are your valves cracked ?

[Piggaz]

why the hell are your valves cracked ?

Cam stopped spinning.. Bottom end kept rotating. Piston and valves weren't in sync... BOOM!

Damn interference engines