360 LA turbo exhaust question
- Thread starter Plato2k5
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Fix it and rip it some more!
You just found the boost fuse.
73golddusterkid
Gold Duster Kid
Would love to see some video of that Jeep ripping and boosting!
dusted
Well-Known Member
It’s amazing what an added atmosphere will do for power!
Looked down intake runners.... found bits of metal balls. Pulled #2 plug, the gap I had is no longer lol. My guess is piston ring land let go.
I have a good running 360 from a friend I’ll be picking up. I’ll pull heads and re gap rings, throw in an lms head gasket, arp head studs and arp main and rod bolts.
The oil leak was fixed. My pcv was putting pressure into crankcase and blowing out the front seal. That was fun to figure out.
The thing that fell off the Jeep in the video... billet muffler was just slipped on.
Only vids I have
I have a good running 360 from a friend I’ll be picking up. I’ll pull heads and re gap rings, throw in an lms head gasket, arp head studs and arp main and rod bolts.
The oil leak was fixed. My pcv was putting pressure into crankcase and blowing out the front seal. That was fun to figure out.
The thing that fell off the Jeep in the video... billet muffler was just slipped on.
Only vids I have
dusted
Well-Known Member
Awesome! I just let my breathers vent to atmosphere. I’ve seen some catch can setups, but not a fan on older stuff. Might be time for some methanol injection also. What was your IAT temps? Noticed no intercooler.
dusted
Well-Known Member
Kinda of fun to find the limit of components.
I do have meth injection. I was just spraying water though. Not sure what the IAT was. I know as soon as I roll into it, it comes way down with the water. I don’t really have room for intercooler.... May have to make room though.
I did end up just running another breather.
I did end up just running another breather.
T56MaxTorq
Well-Known Member
Metal balls would be melted bits of piston. My guess would be from detonation. Did you ever run it lean?
Breaking a ring land is possible, On oem pistons, if the gap was pushing .030” I would be doubtful. When the ring land let’s go, it takes the head and valves with it. Along with some bent pushrods. Turbo would be shelled out. Burning the piston from running a lean mixture melts the tops and plug and the aluminum oxides with the excess o2 and then changes phases from solid to liquid. Keeping it rich and free of o2 prevents the phase change because it is extremely hard to melt Al without oxygen present.
Next motor, after a few passes, try pulling every plug and cutting them open. AFR gauges are a great tool, but every cylinder and injector is a little different.
Breaking a ring land is possible, On oem pistons, if the gap was pushing .030” I would be doubtful. When the ring land let’s go, it takes the head and valves with it. Along with some bent pushrods. Turbo would be shelled out. Burning the piston from running a lean mixture melts the tops and plug and the aluminum oxides with the excess o2 and then changes phases from solid to liquid. Keeping it rich and free of o2 prevents the phase change because it is extremely hard to melt Al without oxygen present.
Next motor, after a few passes, try pulling every plug and cutting them open. AFR gauges are a great tool, but every cylinder and injector is a little different.
dusted
Well-Known Member
My experience has been when a ring butts or touches, it take the top of the piston and or ring lands off. Detonation was what I was thinking also from high IATs.
anything is certainly possible. Guess I will find out once I pull the heads. This engine was probably a 9.5:1 NA engine. I had no detonation (that could be heard). I had it running around 10:1 under full load.... was actually going to tune it out in the sand and slowly pull fuel out.
I just figured piston land because something hit the spark plug to make the center electrode touch the grounding electrode. The plug looked normal other than that. The pistons are Hypereutectic and have no idea what the ring gap was set to. Built this engine 12 or so years ago.
At any rate, new engine will go in and it will be far better suited for boost.
I just figured piston land because something hit the spark plug to make the center electrode touch the grounding electrode. The plug looked normal other than that. The pistons are Hypereutectic and have no idea what the ring gap was set to. Built this engine 12 or so years ago.
At any rate, new engine will go in and it will be far better suited for boost.
Updates:
So I tore the engine down.... Number 2 piston was completely trashed. Skirt was cracked and so was the entire pistone. Definitely from detonation like suggested above. Number 6, 7, 8 had cracks in the ring lands as well. The cylinder wall on number 2 is cracked in 2 spots...block is junk.
Picked up another engine to do a quick hone and throw together with new bearings and rings. I CCd the block and heads. I'll be rite at 8.5:1. I will be controlling timing with the computer this time around as well using a new MSD billet dizzy.
I completely failed to realize my timming was way to much with the rush of getting it built in time for my trip. My total advance was around 33-34.... lol. Live and learn and like they say, the first engine you add a turbo to will not last long.
With the computer able to control timing, I'll be pulling timing as boost goes up. Also, I can have it pull timing when the intake air temps go up. Another feature I like is I can have it protect against over boost by cutting fuel and spark together.
So I tore the engine down.... Number 2 piston was completely trashed. Skirt was cracked and so was the entire pistone. Definitely from detonation like suggested above. Number 6, 7, 8 had cracks in the ring lands as well. The cylinder wall on number 2 is cracked in 2 spots...block is junk.
Picked up another engine to do a quick hone and throw together with new bearings and rings. I CCd the block and heads. I'll be rite at 8.5:1. I will be controlling timing with the computer this time around as well using a new MSD billet dizzy.
I completely failed to realize my timming was way to much with the rush of getting it built in time for my trip. My total advance was around 33-34.... lol. Live and learn and like they say, the first engine you add a turbo to will not last long.
With the computer able to control timing, I'll be pulling timing as boost goes up. Also, I can have it pull timing when the intake air temps go up. Another feature I like is I can have it protect against over boost by cutting fuel and spark together.
dusted
Well-Known Member
You did-a great job!!! Love the carnage!
Back in the day with the grand national, we pulled 1 degree of timing with 1 pound boost. My car is set to 26 and the truck is at 28.
Back in the day with the grand national, we pulled 1 degree of timing with 1 pound boost. My car is set to 26 and the truck is at 28.
Yeah it was a nice surprise! Was hoping I could re use the block....that sucked when I found it was cracked 
That's exactly what I plan to do...1 PSI pull 1*. Not sure how much I'll run total...maybe 18 to be safe for now. I don't need to make the most power. I have a 74 360 block as well that I will use to build a good engine. For now, this engine just needs to last for the rest of the season.
That's exactly what I plan to do...1 PSI pull 1*. Not sure how much I'll run total...maybe 18 to be safe for now. I don't need to make the most power. I have a 74 360 block as well that I will use to build a good engine. For now, this engine just needs to last for the rest of the season.
Did you open the ring gaps up when you put the motor together?
It looks like the top compression ring butted together under boost.
It looks like the top compression ring butted together under boost.
67Dart273
Well-Known Member
When you do PLEASE put up a detailed progress thread and details what/ how / who etc
T56MaxTorq
Well-Known Member
Wow that’s some good stuff, how unfortunate. Mega squirt is a great tool and offers lots of features for ignition and fuel. I use it, too. You can also use boost control to limit boost instead of fuel and spark cut, which is more of a protection-limiting feature, not a controlling feature. You don’t want to be in the thick of it, and be bouncing off/on of fuel and ignition cut-outs. You want the wastegate to primarily throttle turbine inlet pressures, not fuel or ignition.
That piston sure looks like a ring land butt-up blowout. Damn shame. Although with the low boost you desire, you can build a small block with a lot of oem parts, cheaply, and have 400 lb Tq. easily.
I was just gloating your raspberry pi and tunerstudio lcd gauge display in the small block forum earlier today. Looks good!
That piston sure looks like a ring land butt-up blowout. Damn shame. Although with the low boost you desire, you can build a small block with a lot of oem parts, cheaply, and have 400 lb Tq. easily.
I was just gloating your raspberry pi and tunerstudio lcd gauge display in the small block forum earlier today. Looks good!
I did not open he gaps. I thought that was the issue....but a pro builder told me it was detonation. Makes sense since I was on 87 and way to advance with high compression
Oh I have a waste hate to control the pressure. I was more saying “if” the ease gate were to stick closed.
Love the pidash! I actually had left the Bluetooth keyboard in the truck and was unable to change the VE table. Not that I needed to hahaha
Oh I have a waste hate to control the pressure. I was more saying “if” the ease gate were to stick closed.
Love the pidash! I actually had left the Bluetooth keyboard in the truck and was unable to change the VE table. Not that I needed to hahaha
Awesome build! I've often read that the hypers shatter like that under detonation.
Been beating the hell out of it on the roads near my house for a while. Day before I was to leave to Silver Lake sand dunes here in Michigan, on a 1 - 2 shift, it started to make horrible noise.... thought I blew it up. Pulled to the side and got out...no oil, no holes...but god awful mechanical noise. Limp it a mile home. Pull valve covers. Number 5 exhaust pushrod pushed through the rocker. This also took out the intake pushrod and made it a nice "s" shape. Next day ordered chrome moly pushrods and new rockers.
Installed them and loaded it on the trailer.
First drive out to the dunes I noticed my blow off valve stopped working. No biggie, don't really need it with 6 psi. Thrashed it hard that friday night. Installed a 6 gallon water jug in the back to ensure I don't run out of water to spray to keep the IAT numbers down. Runs hard and strong. Exhaust likes to glow and shoot flames. Managed to roll it once lol.
Get home and decide to see why the BOV was no longer working.... WTF is the nut!?!??! and WHY IS THERE A NUT !??!?!?! Pull the intake elbow and use my snake camera...find the plate hanging out on the #5 intake valve. Luckily its a huge plate or else it would of been a bad bad bad day. The threads had no trace of loctite.
Installed them and loaded it on the trailer.
First drive out to the dunes I noticed my blow off valve stopped working. No biggie, don't really need it with 6 psi. Thrashed it hard that friday night. Installed a 6 gallon water jug in the back to ensure I don't run out of water to spray to keep the IAT numbers down. Runs hard and strong. Exhaust likes to glow and shoot flames. Managed to roll it once lol.
Get home and decide to see why the BOV was no longer working.... WTF is the nut!?!??! and WHY IS THERE A NUT !??!?!?! Pull the intake elbow and use my snake camera...find the plate hanging out on the #5 intake valve. Luckily its a huge plate or else it would of been a bad bad bad day. The threads had no trace of loctite.
dartfreak75
Restore it, Dont part it!
That's just awesome I love turbos and jeeps!! Following
dusted
Well-Known Member
That’s awesome!!! Was that a “China” part that failed!!! Hahaha. Did you find the nut? Glad there wasn’t more damage
Its definitely a different kind of power while off roading. Have yet to have it on any sort of trails...just the sand dunes. But it had more power than my previous hopped up NA 360 before that blew with the turbo lol. Plus now its actually quite enough to where you can talk to the passenger and not get a damn migraine after a days worth of driving. I do miss that lopey/choppy idle though
The BOV was an on3performance branded one...a china copy of a TIAL. I grabbed my brothers off of his 6.0 mustang (another project) and tore it apart to loctite all the screws. I did find the plate with a machined nut by the intake valve. Luckily it was not small......
The BOV was an on3performance branded one...a china copy of a TIAL. I grabbed my brothers off of his 6.0 mustang (another project) and tore it apart to loctite all the screws. I did find the plate with a machined nut by the intake valve. Luckily it was not small......
dusted
Well-Known Member
Boost is addictive!
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