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robbo_rb180

Rob's 180sx track car

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So starting a separate build thread for the race car as its about to go through another small build/update. 

Original build starts around page 2 https://www.sau.com.au/forums/topic/472170-robs-sil80-more-skyline-than-s-chassis/page/2/

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The car has been great since originally putting it together but after 18 months of use it is showing a lot of signs of use. So after the last event it was showing signs of heavy blow by and lower compression since last compression test 150ish down to 115. Decided to pull the engine out and do a freshen up with rings, bearings and gaskets but after pulling off the turbo found oil had been leaking into both housings. After a bit of investigation I found the restrictor wasn't a restrictor but just an adapter 😅

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Wasn't going to pull the motor down as found where the oil was coming from but I just kept thinking while the engines out......... 

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Spent the afternoon stripping it down and I was surprised with what I found 

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This was the worst of the 2 rod bearings and one of the mains had marks in it along with the exhaust cam. Cylinders 1 & 2 both had marks in the bores so hopefully honing will help.

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Seeing a machine shop later in the week to see what can be done. Will definitely be doing rods and pistons now. 

While the engines out I'll be tidying up the engine bay. Fix the hacked up cooler holes, dodgy tower repairs, clean up wiring and a new colour maybe silver or grey to help spot leaks. 

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Specs as of 13 october 2020

Engine- sr20
arp headstuds
metal head gasket
gtx gen2 2867
1350cc injectors
Aeroflow fuel reg
walbro 460L
Link G4+ ECU
fmic
3 inch exhaust
turbosmart BOV

Driveline
s14 5 speed
NPC RB Heavy duty conversion clutch
4.3 diff ratio
Nismo centre
5 bolt axels

Suspension & brakes
s15 5 stud
urethane bushes
MCA X-R coilovers
whiteline sway bars
kazama rear camber, toe & traction arms
gktech castor arms
r33 brakes unknown rotors
Elig race pads front, street pads rear
hel braided lines

wheels & tyres
TE37 17x9 +22
255 40 17 Advan A050

Inside
Cobra suzuka seat
5 point harness
AGI Half cage
Defi guages- water & oil temp, oil pres & boost
works bell quick release
keys racing suede wheel
battery in rear seat area

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Been slowly collecting parts and the new internals arrived this week so engine was dropped off for machining. Just going to get crank linished, rotating assembly balanced and deck the block. Heads getting hot washed then returned so I can start porting it before being machined. 

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Hit some suspect areas in the engine bay with a wire wheel and found some dodgy repairs 

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Plan is to sand blast the bay and see how bad it is. 

Also got to see the plans for the new track and stage 1 looks good but is now 12 months away so going to try and get the car all sorted for japnats at QR in April 

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11 minutes ago, iruvyouskyrine said:

Where is this new track at? That bearing wear is unbelieveable haha, making any noises? did you have an oil pressure sensor?

Track is 40 mins west of Townsville at Calcium.
No noise but I have an oil pressure guage and it did show low pressure a few times at idle in the last sprint session. Will be wiring a pressure sensor to ecu and setting up a rpm limiter on the new motor.

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New year updates

Got the engine back a few days before Xmas and everything was here ready for the build.


Did some prep of rebleeding the lifters, cleaning the cam caps and rockers, Clean and primed oil pump, linished the crank and did a board of torque settings & clearances.

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gave the block a really good clean and blew it out with compressed air ready for final measure and assembly
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Gapped the rings, assembled piston & rods and got into it. Had the rotating assembly in first then had a bit of spare time left so got the head on too.

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Before i put the cams in I had to helicoil a cam bolt thread and with that done got the top end assembled. Ended up doing it twice as I thought I had the inlet cam a few teeth off but was fine, nothing wrong with double checking.
I put the sump on with all fresh gasket sealant and started threading in the bolts to find the rear 2 were stripped so off with the sump, ran a tap thru and put it on only to find bolts still not grabbing :rant: so just ended up chucking new bottom on to seal the engine until I get another helicoil kit. Got a heap of little bits on but still need new fan bolts, paint cam cover & port/tidy exhaust manifold.

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Bar a few little things its 90% done, been pretty satisfying so far but will see how it all goes when I go to run it :7_sweat_smile:

Fixed up 2 of the castor box nuts that had broken off the frame and patched part of the chassis which was damaged, welded plates into the castor boxes and fitted new lca with plates & new ball joints.
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Will get the few keep doing small bits as need to do a big clean up and reorganise the shed to install the hoist 

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