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Articles on Engine Knock

Started by SHOdded, April 05, 2016, 08:29:17 AM

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FoMoCoSHO

You know, I keep seeing these fancy cleaners yet I haven't heard of any oem saying any are safe with GTDI equipped vehicles. They never seem to address those concerns. I find it hard to believe they aren't aware of what happens when chunks of carbon break off and fly through the cylinder and turbos.

Methinks these companies care more about their bottom line than our carbon issues.




SHOdded

Why would oems say they are safe unless they get some promotional value out of it?  No freebies.  In any case, this cleaner is meant as a regular maintenance item every 10K miles, not for use once the problem has already gained a foothold.  Definitely would like to seem some sort of progressive tests as the miles roll by like BG did with their products, tho.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

#17
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SM105K

"It has nothing to do with the amount of oil in the combustion chamber, or if the engine is consuming oil or not. There's going to be oil in the upper ring zone in every properly lubricated engine. It's a question of whether the oil in the upper ring zone has a tendency to hold fuel, or not. If the fuel mixes with the oil, and the oil creates an emulsion, if you will, where it holds the fuel in the oil, that's where things can begin to go bad," says Speed.

Profound, and easily interpreted. 
"M" 2013 SHO PP | AJPTurbo E30 Tune | FS HPFP | Stock IC with Ice Water DIY Sprayer | PPE Downpipes | Custom Magnaflow Resonator | 3rd Cat Delete | Derale Upgraded Trans Cooler | Dicunzolo Gen2 Trans Mounts| EPP Noisemaker Eliminator | MSD Coil Over Plugs | SP-542's | UPR Dual Valve Catch Can | K&N Drop In | Power Stop Slotted and Drilled Rotors with Stock PP Pads | H&R Springs  | AVS Flush Deflector | 802SHO Custom Splitter | Duraflex Chin Spoiler | Curva Concept C7's | Continental DWS06 Extreme Contact Rubber | 411 HP and 546 TQ |

"The Fukus" 2013 Focus ST | Boomba BOV | FSWerks Short Shifter | Power Stop Brakes | Continental DWS06 Extreme Contact Rubber |

SHOdded

https://alternatesupercars.com/direct-injection-piston-damage-could-be-your-oil/

Direct Injection Piston Damage? Could Be Your Oil
HOW THE WRONG OIL CAN RUIN YOUR NEW DIRECT INJECTION PERFORMACE ENGINE
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

Mike, if you want to try a different oil, you could use the most upside down formula tested to date on this spreadsheet
https://docs.google.com/spreadsheets/d/1gEMTa3YOBIYBTYiaEhQLfooPohN_l645z1DaWRuFzC0/edit#gid=1618148264

Catrol Edge ... though 5W20 in this sample, I am sure the philosophy carries through to the 5W30 as well.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

https://www.underhoodservice.com/oil-direct-fuel-injection/

"High-Pressure Fuel Pump and Oil
The main destroyer of high-pressure fuel pumps is delayed oil changes. Wear between the camshaft lobes and the high-pressure pump follower prevents the pump from generating enough piston movement. Less movement of the pump means less pressure. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high-pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the stroke of the pump.

You should examine the lobes on the camshaft before installing a new, expensive high-pressure fuel pump. A lack-of-power complaint may improve from this measure, but will never be completely corrected."
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

https://www.lubrizoladditives360.com/wp-content/uploads/2018/09/Mitigating-LSPI-Over-the-Drain-Interval.pdf

To be taken with a grain of salt :D since neither the levels of additives tested nor the base stocks are specified in the article.  Nonetheless, an important note on engine oil performance over the OCI.

QuoteA total of four oils were tested: a baseline oil – all calcium detergent system (poor LSPI performance); Formulating solution 1 – calcium is reduced and magnesium is added; Formulating solution 2 – molybdenum dialkyldithiocarbamate (MoDTC) is added; and finally Formulating solution 3 – the addition of titanium.

The results of the tests found that all three formulation strategies were successful at mitigating LSPI in fresh oil; however, following the aging process, the propensity of LSPI was observed to be very different. Both formulation 2 and 3 showed very poor LSPI durability, while formulation 1 was the only oil to continue to mitigate LSPI when aged.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

Fuel property effects on low-speed pre-ignition

https://www.sciencedirect.com/science/article/pii/S0016236118308858

QuoteAbstract
This work explores the dependence of fuel distillation and flame speed on low-speed pre-ignition (LSPI). Findings are based on cylinder pressure analysis, as well as the number count, clustering, intensity, duration, and onset crank angle of LSPI events. Four fuels were used, with three of the fuels being blends with gasoline, and the fourth being neat gasoline. The blended fuels consisted of single molecules of different molecular types: a ketone (cyclopentanone), an alcohol (2-methyl-1-butanol), and an aromatic (ethylbenzene). All three pure molecules have RON values within ±2 and boiling points within ±5 °C. These fuels were blended with gasoline to a 25% mass fraction and were used to run the engine at identical LSPI prone operating conditions. The findings highlight that fuels with similar boiling properties and octane numbers can exhibit similar LSPI number counts, but with vastly different LSPI magnitudes and intensities. Moreover, the results highlight fundamental fuel properties such as flame speed are critical to characterizing the LSPI propensity and behavior of the fuel.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

Why it is important to shift to SN+ certified/compatible oils - not only for drag strip conditions, but at long stoplights or onramps or city driving.  Many will face this situation on a daily basis as traffic continues to deteriorate.

QuoteThe raw fuel doesn't have sufficient time to fully vaporize, due to a lack of turbulence and an abbreviated dwell time. This fuel can puddle between the upper piston ring and ring land. When mixed with the oil, it can produce this low octane compound. When the throttle pedal is punched after extended idling, this compound can pre-ignite, causing severe damage to the piston rings and lands.

Another factor contributing to LSPI is a fuel's distillation curve, which displays how easily a fuel evaporates. Interestingly, whereas a racing or premium fuel is typically desired for performance driving, a standard fuel will vaporize more easily. While it is still necessary to have a high-enough octane to support an engine's compression and performance needs, some racing fuels with a high distillation temperature can be detrimental in direct-injected engines. This is due to the higher octane racing fuel's resistance to vaporization and the resulting LSPI occurring in direct-injected engines.

https://www.lsxmag.com/tech-stories/engine/the-highly-specific-life-of-ls-and-lt-based-motor-oils/

2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

SHOdded

Octane - RON more relevant than MON.  Also, intake air temperature, pressure, and engine speed seem to affect knock readings more than octane.

https://www.thefreelibrary.com/Understanding+the+octane+appetite+of+modern+vehicles.-a0478823007
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!