Forced Induction motors that have died

phunk · 05-22-2014, 07:47 PM

Quote:

Originally Posted by 1slow370

since we are having blown motors this is a good readEngine Detonation

is that your website?

1slow370 · 05-22-2014, 08:07 PM

No zero affiliation just a good read

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phunk · 05-22-2014, 08:10 PM

right on. its been like 9-10 years since i have dealt with that guy but he used to get on my nerves lol

1slow370 · 05-22-2014, 08:23 PM

I mean its not the best some of it seems specific to one application like the knock hertz and the figures for peak pressure, and some info is left out like knock windowing but it is a good intro to the concept

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1slow370 · 05-22-2014, 08:25 PM

The article on compressor maps im not fond of there were a lot of generalizations like using the simplified ideal gas law instead of the full equation sooo...

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blak max · 05-23-2014, 04:34 PM

anyone currently have a blown motor?

Dajerseyrat · 05-23-2014, 04:52 PM

Quote:

Originally Posted by 1slow370

No blowing a second ring sounds like the boost was getting trapped in the rings which leads to fluttering and cracking ring lands, that or that wasn't an issue and the shiz just let go, who knows?

Excessive EGT's or lack of oil, or cylinder wash from running too rich, or detonation...Boost does not get caught in the rings...There is a thing called blowbye...

1slow370 · 05-23-2014, 04:58 PM

I simplified it ****, more boost =more blow by meaning on a fi motor you want to run a wider second compresion ring gap, especially since the factory pistons have no accumulator groove between the rings. The motor comes stock with the second ring running a tighter gap than the first ring which leads to flutter on a boosted engine since there is more blow by

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future370zzz · 05-23-2014, 05:12 PM

Just picked up the Z with Stillen upgraded impeller and 9PSI pulley. Added a temperature sensor just before the Stillen manifold. I'm seeing about a 20-25 degree difference from the IAT MAF sensor to the manifold. I.e. 100 degrees at the MAF sensor and 125 degrees just before it enters the Stillen manifold.

Should have really tapped into the Stillen manifold right before it enters the engine since there is a cooling core within the manifold that should bring the temps back down, just don't know by how much and if its close to the MAF readings. That is the next step.

Mr.Squeeze, what AFR and Octane were you running?

EDIT: Just looked at AIT = 95 degrees and temperature just before entering manifold cooler was at 145 degrees. Ambient temp was about 75 only. Holy crap, can't wait for summer time. ughhh Again, I wonder what temp it is after the manifold cooler.hmmm My mechanic/tuner/z guru is wondering that too.hahahah

shadow85 · 12-23-2016, 02:39 AM

Oh man 3 pages and only one person man'd up lol!

ANMVQ · 12-23-2016, 01:10 PM

Quote:

Originally Posted by JWillis72

After reading all of the recent stories of motors that didn't survive going F.I. I'm curious about how often this has happened. If you have had a motor die on you I would like to know the details of what happened.

What was the WHP?
What wtrq?
How long did it run before it died?
Was it ever 100% running right before it died?
What kit?
What PSI?
What was the cause if you know?
What year was the car?

Hey Jay ,

incase we forgot my story as it was a few years ago.

What was the WHP? 465
What wtrq? 330
How long did it run before it died? 3DAYS!!!
Was it ever 100% running right before it died? Yes, long story
What kit? Stillen SC
What PSI? 13 PSI
What was the cause if you know? Cyl 3 went bye,
What year was the car? 2011 G37X Coupe

Long story was a drove the car for 6 months @ 412 WHP and 300WTRQ, had some issues with the SC ingesting water, then TB harness broke, fuel pump feed line split cause it was wrong. Pretty much all this happened the same time. So I upgraded the impeller and got a retune from Kaizen. The car ran great for 3 days the blew up.

Not to revisit the whole story but I think the tune was part of the issue on top of the tuner making multiple WOT pulls on the dyno and telling me the car is way down of fuel. They probably could have diaq'd it better and making WOT pulls before finding the feed line was split to the fuel pump. Hell I suggested that over the phone after they had the car for like 2 weeks!

I also upgraded everything under the sun and still failed

TopgunZ · 12-23-2016, 03:57 PM

Don't you think it could have been intake temp related? 13psi and not knowing temps....?

SG4247 · 12-23-2016, 09:45 PM

Quote:

Originally Posted by 1slow370

I simplified it ****, more boost =more blow by meaning on a fi motor you want to run a wider second compresion ring gap, especially since the factory pistons have no accumulator groove between the rings. The motor comes stock with the second ring running a tighter gap than the first ring which leads to flutter on a boosted engine since there is more blow by

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+1
We now do this to the rings on very high compression natural aspiration racing engines as well. Improved oil consumption, improved high RPM ring seal (flutter), and less ring failures with this gap strategy, even though it seems to go against conventional wisdom. We use very thin, light tension rings.

JWillis72 · 12-23-2016, 10:02 PM

Quote:

Originally Posted by ANMVQ

Hey Jay ,

incase we forgot my story as it was a few years ago.

What was the WHP? 465
What wtrq? 330
How long did it run before it died? 3DAYS!!!
Was it ever 100% running right before it died? Yes, long story
What kit? Stillen SC
What PSI? 13 PSI
What was the cause if you know? Cyl 3 went bye,
What year was the car? 2011 G37X Coupe

Long story was a drove the car for 6 months @ 412 WHP and 300WTRQ, had some issues with the SC ingesting water, then TB harness broke, fuel pump feed line split cause it was wrong. Pretty much all this happened the same time. So I upgraded the impeller and got a retune from Kaizen. The car ran great for 3 days the blew up.

Not to revisit the whole story but I think the tune was part of the issue on top of the tuner making multiple WOT pulls on the dyno and telling me the car is way down of fuel. They probably could have diaq'd it better and making WOT pulls before finding the feed line was split to the fuel pump. Hell I suggested that over the phone after they had the car for like 2 weeks!

I also upgraded everything under the sun and still failed

I asked this question in 2014 and unfortunately I joined the club of blown motors this year! Was your tuner named Rob by chance?

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jax4557 · 12-24-2016, 12:37 AM

What was the WHP: NO DYNO
What wtrq: NO DYNO
How long did it run before it died: 4 Months
Was it ever 100% running right before it died: It seemed strong and fine with slight gremlins
What kit: BP v2 PT 6766
What PSI: 14 PSI
What was the cause if you know: Cyl 1 ringlands broke and dropped rings
What year was the car: 2014 370Z Sport
Tuner: SEb at Specialtyz
Software: Ecutek
Fuel: Flex ( E81 at time of failure )

The tune was complete and I was happy, I did notice that I would have issues starting after driving somewhere and it sitting for 30 minutes or so.. (hydrolock)? I also thought I was smelling E85 in the oil but I could not confirm this. I was doing a roll in Mexico against a gtr and although I won I noticed slight smoke. I pulled off to a gas station and could not find any smoke so I drove home and the next morning I started it and it was smoking profusely. A teardown revealed cyl 1 ringland and rings dropped but no denotation that was obvious on the piston.

05-22-2014, 08:07 PM	#32 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	No zero affiliation just a good read Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

05-22-2014, 08:10 PM	#33 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,654 Drives: 370 Rep Power: 944523	right on. its been like 9-10 years since i have dealt with that guy but he used to get on my nerves lol __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

05-22-2014, 08:23 PM	#34 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	I mean its not the best some of it seems specific to one application like the knock hertz and the figures for peak pressure, and some info is left out like knock windowing but it is a good intro to the concept Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

05-22-2014, 08:25 PM	#35 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	The article on compressor maps im not fond of there were a lot of generalizations like using the simplified ideal gas law instead of the full equation sooo... Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

05-23-2014, 04:58 PM	#38 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	I simplified it **, more boost =more blow by meaning on a fi motor you want to run a wider second compresion ring gap, especially since the factory pistons have no accumulator groove between the rings. The motor comes stock with the second ring running a tighter gap than the first ring which leads to flutter on a boosted engine since there is more blow by Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST** Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

05-23-2014, 04:34 PM	#36 (permalink)
blak max Enthusiast Member Join Date: Apr 2014 Location: CFL Posts: 476 Drives: Ls swapped 370z Rep Power: 3368	anyone currently have a blown motor?

05-23-2014, 05:12 PM	#39 (permalink)
future370zzz Track Member Join Date: Dec 2011 Location: Bay Area Posts: 555 Drives: 10 Nissan 370z Rep Power: 14	Just picked up the Z with Stillen upgraded impeller and 9PSI pulley. Added a temperature sensor just before the Stillen manifold. I'm seeing about a 20-25 degree difference from the IAT MAF sensor to the manifold. I.e. 100 degrees at the MAF sensor and 125 degrees just before it enters the Stillen manifold. Should have really tapped into the Stillen manifold right before it enters the engine since there is a cooling core within the manifold that should bring the temps back down, just don't know by how much and if its close to the MAF readings. That is the next step. Mr.Squeeze, what AFR and Octane were you running? EDIT: Just looked at AIT = 95 degrees and temperature just before entering manifold cooler was at 145 degrees. Ambient temp was about 75 only. Holy crap, can't wait for summer time. ughhh Again, I wonder what temp it is after the manifold cooler.hmmm My mechanic/tuner/z guru is wondering that too.hahahah ChaseZ likes this. Last edited by future370zzz; 05-23-2014 at 07:51 PM.

12-23-2016, 02:39 AM	#40 (permalink)
shadow85 Track Member Join Date: Jul 2015 Location: South Australia, Austra Posts: 917 Drives: 15' 370Z A/T AMM TT Rep Power: 24	Oh man 3 pages and only one person man'd up lol! Last edited by shadow85; 12-23-2016 at 08:37 AM.

12-23-2016, 03:57 PM	#42 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6833	Don't you think it could have been intake temp related? 13psi and not knowing temps....? jwick, ANMVQ and shadow85 like this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

12-24-2016, 12:37 AM	#45 (permalink)
jax4557 Base Member Join Date: Nov 2014 Location: Jacksonville Posts: 102 Drives: 2014 370z Sport M6 Rep Power: 10	What was the WHP: NO DYNO What wtrq: NO DYNO How long did it run before it died: 4 Months Was it ever 100% running right before it died: It seemed strong and fine with slight gremlins What kit: BP v2 PT 6766 What PSI: 14 PSI What was the cause if you know: Cyl 1 ringlands broke and dropped rings What year was the car: 2014 370Z Sport Tuner: SEb at Specialtyz Software: Ecutek Fuel: Flex ( E81 at time of failure ) The tune was complete and I was happy, I did notice that I would have issues starting after driving somewhere and it sitting for 30 minutes or so.. (hydrolock)? I also thought I was smelling E85 in the oil but I could not confirm this. I was doing a roll in Mexico against a gtr and although I won I noticed slight smoke. I pulled off to a gas station and could not find any smoke so I drove home and the next morning I started it and it was smoking profusely. A teardown revealed cyl 1 ringland and rings dropped but no denotation that was obvious on the piston.

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