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Relief for Exhaust Valves #4503173
08/31/17 09:41 AM
08/31/17 09:41 AM
Joined: Jan 2006
Posts: 2,648
Idaho
SubLGT Offline OP
SubLGT  Offline OP
Joined: Jan 2006
Posts: 2,648
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 20C 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 todays 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 26C and 32C. The improvement in exhaust valve head temperatures was even greater; on a solid valve the peak was reduced by up to 70C and on a hollow, sodium-filled valve, by up to 67C

...HTC (High Thermal Conductivity) materials and TIM (Thermal Interface Material) coating to reduce valve head temperatures by up to 70C, 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.

Re: Relief for Exhaust Valves [Re: SubLGT] #4503190
08/31/17 10:06 AM
08/31/17 10:06 AM
Joined: Nov 2006
Posts: 19,910
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,910
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.
Re: Relief for Exhaust Valves [Re: SubLGT] #4503194
08/31/17 10:12 AM
08/31/17 10:12 AM
Joined: Nov 2008
Posts: 12,533
NH
supton Online content
supton  Online Content
Joined: Nov 2008
Posts: 12,533
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, 163k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 144k, ours
1999 Toyota Camry LE, 2.2L/4AT, 190k, his
Re: Relief for Exhaust Valves [Re: supton] #4503257
08/31/17 11:28 AM
08/31/17 11:28 AM
Joined: Feb 2014
Posts: 2,490
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,490
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
Re: Relief for Exhaust Valves [Re: Trav] #4503379
08/31/17 01:19 PM
08/31/17 01:19 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
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

Re: Relief for Exhaust Valves [Re: supton] #4503402
08/31/17 01:46 PM
08/31/17 01:46 PM
Joined: Jun 2003
Posts: 17,348
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,348
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.

Last 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
Re: Relief for Exhaust Valves [Re: SubLGT] #4503741
08/31/17 07:20 PM
08/31/17 07:20 PM
Joined: May 2014
Posts: 1,232
Minnesota
philipp10 Offline
philipp10  Offline
Joined: May 2014
Posts: 1,232
Minnesota
Huh? Not sure how you all came to such a negative reaction to an article on the engineering of valve.....jeeez


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