Recent Topics
GM Ecotec 2.4 - Cracked Exhaust Manifold
by The Critic
06/22/18 05:05 AM
Half Price - Shell Helix HX7, Castrol Edge and GTX
by SR5
06/22/18 03:59 AM
Why hang your bicycle from the ceiling?
by mjoekingz28
06/22/18 03:47 AM
Oil For High Sustained RPM on BMW S52
by ZEK
06/21/18 10:41 PM
Chevy brought the blazer back
by WiskyBadger
06/21/18 10:07 PM
LC20 and uses in modern motor oil
by synman
06/21/18 10:01 PM
Full Synthetic CJ-4 or > 5W-30 or 10W-30
by LeTempt
06/21/18 09:57 PM
2018 RAM 1500 EcoDiesel
by OVERKILL
06/21/18 08:37 PM
Fram SureGrip coating
by mobilaltima
06/21/18 08:24 PM
Manual transmissioned electric car
by mjoekingz28
06/21/18 06:45 PM
1991 Toyota Previa New JDM engine Redline
by Kurtatron
06/21/18 06:26 PM
8 yr old channeling John Bonham
by Toy4x4
06/21/18 06:02 PM
Traveller nlgi 2
by Spitter
06/21/18 05:33 PM
Upgrading the Kohler 7000 series air cleaner
by Patrick0525
06/21/18 05:08 PM
Any nano reefers here?
by RichardS
06/21/18 05:04 PM
ARC remanufactured Power Steering Pump
by Pajero
06/21/18 04:58 PM
John Deere "Easy Change" System gimmick
by SnowmanCO
06/21/18 04:55 PM
Oz Planstic Bag Bans - not so green.
by Shannow
06/21/18 04:31 PM
help me choose...
by chaindrive
06/21/18 04:07 PM
France F1 Grand Prix
by DeepFriar
06/21/18 03:16 PM
Newest Members
Fatbrowndog0822, DRNJR, ZEK, Dudewayne, kmdz
65294 Registered Users
Who's Online
50 registered (bullwinkle, bmod305, Astro14, Astro_Guy, 87sammy, 2015_PSD, 6 invisible), 899 Guests and 25 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65294 Members
67 Forums
285753 Topics
4768945 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4503173 - 08/31/17 09:41 AM Relief for Exhaust Valves
SubLGT Offline


Registered: 01/31/06
Posts: 2646
Loc: Idaho
Thats' what Federal-Mogul is offering.

http://articles.sae.org/15575/

Quote:
...At the 2017 IAA motor show in Frankfurt, Federal-Mogul Powertrain plans to reveal advances aimed at cooling the valves of downsized boosted engines via significant heat transfer. For exhaust valve head alloys, every 20°C reduction in temperature negates the need for an upgrade to the next, more expensive alloy specification….

...Gian Maria Olivetti, Chief Technology Officer, explained ... “The extreme valve temperatures experienced on today’s highly boosted downsized engines can lead to reduced valve fatigue life and critical valve guide and stem seal temperatures, resulting in the need for expensive valve steel alloys. If late ignition timing is used to reduce knock and enrichment is protecting components from critical temperatures, CO2 emissions are increased."…

...tests involving “highly rated turbocharged gasoline engines” using a combination of HTC and TIM technologies are stated by Federal-Mogul to have reduced peak inlet valve head temperatures by between 26ºC and 32°C. The improvement in exhaust valve head temperatures was even greater; on a solid valve the peak was reduced by up to 70°C and on a hollow, sodium-filled valve, by up to 67°C…

...HTC (High Thermal Conductivity) materials and TIM (Thermal Interface Material) coating to reduce valve head temperatures by up to 70°C, allowing improved combustion and lower emissions. HTC can also contribute to obtaining a more even circumferential temperature distribution on the valve seat insert and surrounding cylinder head material. By doing so, local hot spots can be avoided, so reducing wear reduction and temperature-related distortion….

Top
#4503190 - 08/31/17 10:06 AM Re: Relief for Exhaust Valves [Re: SubLGT]
Trav Offline


Registered: 11/20/06
Posts: 18885
Loc: MA, Mittelfranken.de
We found a way to reduce cyl head temps so we can use cheaper materials that will probably fail sooner than later but hey we can use the public as a test mule and as long as its out of warranty who cares we will blame it on them.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

Top
#4503194 - 08/31/17 10:12 AM Re: Relief for Exhaust Valves [Re: SubLGT]
supton Offline


Registered: 11/09/08
Posts: 11963
Loc: NH
True, but most people don't want to own outside of warranty anyhow. They might have unexpected repairs, like needing tires or something really expensive like spark plugs.
_________________________
2011 Toyota Camry, base, 2.5L/6MT, 162k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 143k, ours
1999 Toyota Camry LE, 2.2L/4AT, 183k, his

Top
#4503257 - 08/31/17 11:28 AM Re: Relief for Exhaust Valves [Re: supton]
Lolvoguy Offline


Registered: 02/06/14
Posts: 2336
Loc: Canada
Originally Posted By: supton
True, but most people don't want to own outside of warranty anyhow. They might have unexpected repairs, like needing tires or something really expensive like spark plugs.


...or "break" pads wink
_________________________
06 Lexus IS350- Wife
88 BMW 325is- Mistress
03 Suzuki SV650S- One night stand

Top
#4503379 - 08/31/17 01:19 PM Re: Relief for Exhaust Valves [Re: Trav]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
What
Originally Posted By: Trav
We found a way to reduce cyl head temps so we can use cheaper materials that will probably fail sooner than later but hey we can use the public as a test mule and as long as its out of warranty who cares we will blame it on them.

Ding ding ding

Top
#4503402 - 08/31/17 01:46 PM Re: Relief for Exhaust Valves [Re: supton]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Originally Posted By: supton
True, but most people don't want to own outside of warranty anyhow. .
huh? The motoring public is clueless when it comes to choosing good and bad cars. At least around here they are. If gm found a bunch of vegas or 80s cadillacs the public would buy them up without ever checking the cars past history.


Edited by Chris142 (08/31/17 01:47 PM)
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

Top
#4503741 - 08/31/17 07:20 PM Re: Relief for Exhaust Valves [Re: SubLGT]
philipp10 Offline


Registered: 05/09/14
Posts: 1174
Loc: Minnesota
Huh? Not sure how you all came to such a negative reaction to an article on the engineering of valve.....jeeez

Top