Broke The Rb20 ,name That Failure?

[Dan_J]

so after i fixed all the boost leaks,i found that the adjustable cam gear bolts came loose. started dialing them back in to spec with test runs that i did 4th gear full boost to where it was and even better so under 3.5k to full boost with more adjustment in them.

while testing i heard a loud backfire and engine stalls, tried to start it after awhile and i only get a loud backfire under cracking.

fuel pump works and plugs just changed now, compression tested and is fine

if valves were gone pretty sure that would have shown up on compression

i'm just curious know what it could be with out taking it apart

Edited April 27, 2014 by Dan_J

[89CAL]

Has a hose popped off?

[joe blo]

intercooler pipe blown off

[HR32GTS 4DOOR]

I'm guessing the key in the exhaust cam came off and you put the cas back on in the wrong spot.

[iruvyouskyrine]

I'm betting it's something to do with the CAS.

[89CAL]

  On 27/04/2014 at 9:56 AM, HR32GTS 4DOOR said:

I'm guessing the key in the exhaust cam came off and you put the cas back on in the wrong spot.

Yeah something along those lines is my next bet but seen as the car ran ok until it popped I thought maybe cooler pipe. Sounds like something could have happened to the CAS otherwise but

[Dan_J]

  On 27/04/2014 at 9:56 AM, HR32GTS 4DOOR said:

I'm guessing the key in the exhaust cam came off and you put the cas back on in the wrong spot.

yea i was thinking it could also be something like that, will give it a once over tomorrow

other wise will swap out the engine when i can be bothered

[89CAL]

Swap out the engine? Because you don't know whats wrong with it?

:S

[HR32GTS 4DOOR]

Seeing as it was running and then stopped makes me think the exhaust cam pulley may have either jumped a tooth or wasn't done up right and retarded itself.

Would a cooler pipe blown off cause it to backfire on startup? When I blow one off (lol) it will still fire then just die.

[Dan_J]

  On 27/04/2014 at 12:57 PM, 89CAL said:

Swap out the engine? Because you don't know whats wrong with it?

:S

i work on the principle of expect the worse yet hope for the best and i think i was pushing my luck with air leaks fixed on a responsive untuned motor.... think i'll leave it at that and let trent dail the rest of the adjustment in as shown in the pic attached

Matt wins a prize on this one!

all i have to offer is much cyber #homolove

[89CAL]

Change the engine instead of something you can buy for less than $200....

I was going to say CAS originally but didnt seem right because the car drove ok then stopped and had problems. Looks nasty lol

[Dan_J]

had a spare so it runs fine now and the beauty of it is these engines are about that price range

the reason it broke is because i took off the cam gear cover and did the bolt up as per usual, where as when i dialed in cam gears for the first time i had the cover on making the process back and fourth much longer.

the gear cover has a 4mm spacing to the cas mount doing it up tight with no cover or spacer is its downfall, so i made a spacer out of 3mm flat bar

Edited April 28, 2014 by Dan_J

[Ben C34]

I take it you weren't checking your ignition timing each time you took off the cas?

Otherwise you would have spotted the problem straight away.