Maybe this is how they solved the intake valve carbon build up problem

Gruber

Senior Member
First Name
Mark
Joined
Jan 27, 2018
Threads
2
Messages
2,309
Reaction score
1,521
Location
TN
Vehicle(s)
2018 Honda Civic Sport Touring; 2009 Honda CR-V EX-L
Country flag
... The sodium helps just conduct it. The oil and water remove the heat on a turbo, with the water doing the bulk of the work when off, since there's no oil flow at that point. Still, the heat sink is the oil/water running then water when off. The sodium for the valves isn't the heat sink (it's internal to the valve)... it just helps the heat transfer happen better because it allows head to transfer down the stem into a larger portion of the head. More effective surface area... better heat transfer.
As far as cooling is concerned, sodium in a car engine does exactly the same thing as water and oil. All these fluids only distribute heat and equalize the temperature by circulating in closed spaces between hotter and cooler engine/transission parts.

But in the end, all cars are air-cooled. Only the air is really the heat sink that can reject the heat.

(Yes, submarines, in contrast to automobiles, are water cooled :) )
Sponsored

 
Last edited:

charleswrivers

Senior Member
First Name
Charles
Joined
Nov 3, 2017
Threads
43
Messages
3,736
Reaction score
4,468
Location
Kingsland, GA
Vehicle(s)
'14 Odyssey, '94 300zx, 2001 F-150
Vehicle Showcase
1
Country flag
Kind of... my point was sodium is internal to the valve and isn't a heat sink in itself. It doesn't remove heat in the valve... it distributes it throughout the valve.... whereas oil/water actually is a heat sink as it removes heat from the turbo. Sure... the ultimate heat sink is the environment. I just didn't want someone thinking there was some sodium loop to some heat exchanger through piping or something. I don't know of anything else that is cooling valves other than them seating to their seat on the head and down the length of the stem at the guide. I know fuel will change temperatures as well in the combustion chamber (DI atomization... running rich, etc)... but I've only heard of this using being touted for preventing detonation and not directly at helping cool the valves.

I still have things requiring valve lash adjustments... so caring about it is still a thing for me. Most cars are self adjusting now so it isn't something folks mess with anymore.
 


frontlinegeek

Senior Member
First Name
Jason
Joined
Feb 25, 2018
Threads
6
Messages
765
Reaction score
313
Location
New Brunswick, Canada
Vehicle(s)
2020 CRV Touring, 2017 Civic EX Sedan Honda Sensing
Country flag
I remembered this thread when I saw an animation put out by Honda showing the direct injection system: https://global.honda/innovation/technology/automobile/Vtec-turbo-picturebook.html

The videos on that page show the injectors spraying on the valves.

Screen Shot 2019-12-04 at 9.15.47 PM.png
And when we consider that Honda has been using DI on engines since 2012/13, I would suspect they have been doing it this way for a while as we don't hear anything at all about Accord or CRVs from the pre-turbo era having any carboning issues.
 

Micah

Senior Member
Joined
Oct 19, 2017
Threads
22
Messages
2,203
Reaction score
1,461
Location
Toms River, NJ
Vehicle(s)
'17 Si 4DR FlashPro +9psi (3k-14k) Ktuner TSP Stage 1(14k-30k+) '17 Traverse LT AWD
Country flag
While that may be the case, the 10 year unlimited mileage warranty coverage they have mailed owner's about two or three times ensures that it will take a major reason to justify not keeping the car for 10 years.
 

frontlinegeek

Senior Member
First Name
Jason
Joined
Feb 25, 2018
Threads
6
Messages
765
Reaction score
313
Location
New Brunswick, Canada
Vehicle(s)
2020 CRV Touring, 2017 Civic EX Sedan Honda Sensing
Country flag
While that may be the case, the 10 year unlimited mileage warranty coverage they have mailed owner's about two or three times ensures that it will take a major reason to justify not keeping the car for 10 years.
Ya, if I had a turbo 1.5, I would absolutely hold it for the full 10 years.

Still funny that there has been no news or noise from 1.5T Accord owners or K20C turbo owners in the Accord and Type R. Seems like the only engines that were affected in a major way or any way at all are the Civics and CRVs.
 

BriteBlue

Senior Member
Joined
Jul 6, 2018
Threads
30
Messages
843
Reaction score
393
Location
Illinois
Vehicle(s)
2018 Civic EX-L
Country flag


REBELXSi

Señor Member
Joined
Aug 12, 2018
Threads
44
Messages
2,443
Reaction score
2,377
Location
215
Vehicle(s)
'18 Si coupe RIP, '20 CRV EX-L Hybrid
Country flag

REBELXSi

Señor Member
Joined
Aug 12, 2018
Threads
44
Messages
2,443
Reaction score
2,377
Location
215
Vehicle(s)
'18 Si coupe RIP, '20 CRV EX-L Hybrid
Country flag
I seen nothing about the rotating valves or mention of carbon build up deterrent
Rotating valves?

The carbon build up deterrent is the fact that the injectors are spraying the intake valves.
 

Oddwayne

Senior Member
Joined
Mar 3, 2019
Threads
6
Messages
581
Reaction score
249
Location
Nj
Vehicle(s)
19’ Si coupe & 99 ej6
Country flag
Rotating valves?

The carbon build up deterrent is the fact that the injectors are spraying the intake valves.
I see more often than not, people saying the valves rotate. I find this to be untrue and have been looking for some documentation showing what people are saying. I still think it’s impossible cause I would think that would wear out the keepers.
 

fenix-silver

Senior Member
Joined
Nov 12, 2018
Threads
27
Messages
1,184
Reaction score
968
Location
Central PA
Vehicle(s)
2019 Si
Country flag
I see more often than not, people saying the valves rotate. I find this to be untrue and have been looking for some documentation showing what people are saying. I still think it’s impossible cause I would think that would wear out the keepers.
This is above my pay grade, but from what I've read, valves just naturally rotate a bit, so it doesn't sound like Honda is doing anything to force them to rotate.
 

P51

Member
First Name
Eric
Joined
Dec 1, 2019
Threads
0
Messages
6
Reaction score
6
Location
Southern Calif.
Vehicle(s)
2017 Civic Hatchback LX
Country flag
Can you please clarify why it's impossible that valves would rotate? I can't see why not. If they did not rotate, the valve would have perfect up-and-down scoring lines where it rubs the valve guide.

View attachment 188457
Sponsored

 


 


Top