Author Topic: Direct Injection - Carbon Build Up  (Read 6309 times)

Derkie54

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Direct Injection - Carbon Build Up
« on: June 07, 2020, 07:16:03 PM »
Looking at this Honda media release it seems the 1.3 engine has direct injection.

https://hondanews.eu/gb/en/cars/media/pressreleases/58326/2015-jazz

Is there anything you should do to reduce the carbon build up on the valves over time, or is it not a big problem on these engines ?

Have many of you done high mileages........... without any issues ?


« Last Edit: June 07, 2020, 07:18:10 PM by Derkie54 »
It will be alright in the end, if it's not alright then it's not the end !

monkeydave

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Re: Direct Injection - Carbon Build Up
« Reply #1 on: June 07, 2020, 07:47:27 PM »
1.5 has direct injection the 1.3 has multipoint

so the de tuned mk4 1.5 must have direct injection too
« Last Edit: June 07, 2020, 07:52:36 PM by monkeydave »

Derkie54

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Re: Direct Injection - Carbon Build Up
« Reply #2 on: June 07, 2020, 07:59:55 PM »
Not according to the Honda media release, it states 1.3 direct injection engine.
« Last Edit: June 07, 2020, 08:18:04 PM by Derkie54 »
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jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #3 on: June 07, 2020, 08:57:09 PM »
Looking at this Honda media release it seems the 1.3 engine has direct injection.

https://hondanews.eu/gb/en/cars/media/pressreleases/58326/2015-jazz

Is there anything you should do to reduce the carbon build up on the valves over time, or is it not a big problem on these engines ?

Have many of you done high mileages........... without any issues ?
I can officially declare that our 1.3 i-Vtec has port injection.
3 years, 37600miles, no problem at all.
In case of direct injection, a good tip is to use oils with low noack value, this  to reduce fouling.
« Last Edit: June 07, 2020, 09:00:20 PM by jazzaro »

jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #4 on: June 07, 2020, 09:04:33 PM »
so the de tuned mk4 1.5 must have direct injection too
De-tuned, with an higher RC and  Atkinson Cycle operation. Apart from the direct injection, this last 1.5 is very similar to our "old" 1.3.

Derkie54

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Re: Direct Injection - Carbon Build Up
« Reply #5 on: June 08, 2020, 03:52:38 PM »
Thanks for replies Monkeydave & Jazzaro.

I think you could be right, looking at a lot of reviews and technical specs of 1.3 cars for sale they all say multi point injection.  :)

The Honda release does say 1.3 but they must mean the 1.5 engine......missleading.  :(



It will be alright in the end, if it's not alright then it's not the end !

jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #6 on: June 09, 2020, 01:39:02 PM »

I think you could be right, looking at a lot of reviews and technical specs of 1.3 cars for sale they all say multi point injection.  :)

Years ago I read the same spec list you've posted, then after parking the Jazz in my box I've opened the bonnet and checked with my own eyes: fuel injectors are placed just over each inlet manifold, where the air flux can meet and mix with the fuel.  The head design is similar to many other L series engines with port injection, and the pattern is very similar to this:


Check after minute 10:00, you will see fuel rail and injectors fixed on the head assy after the guy removes the inlet manifolds.
In the 1.5 d.i. the injector is placed just UNDER the inlet manifold, between the air duct and the block top: here you can see a detailed view:
https://paultan.org/2012/11/16/honda-1-5-litre-i-vtec-direct-injection-engine-and-g-design-shift-cvt-sampled-along-with-cr-z-facelift/1-5-di-and-new-cvt-02/
So the 1.3 is definetly port injection.

EDIT
This is a comparison between two L-series heads, you can see where injector holes have been put.

« Last Edit: June 09, 2020, 02:03:31 PM by jazzaro »

Derkie54

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Re: Direct Injection - Carbon Build Up
« Reply #7 on: June 09, 2020, 05:28:59 PM »
Thanks.....that's all the proof I need  :)
It will be alright in the end, if it's not alright then it's not the end !

jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #8 on: June 10, 2020, 03:21:57 PM »
Doh, I found a pic of a L13B2, the close up of the front side without intake manifolds: intake ports and fuel injectors are clearly visible, so this is another proof about port injection.

« Last Edit: June 10, 2020, 03:23:33 PM by jazzaro »

Derkie54

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Re: Direct Injection - Carbon Build Up
« Reply #9 on: June 10, 2020, 06:19:03 PM »
Doh, I found a pic of a L13B2, the close up of the front side without intake manifolds: intake ports and fuel injectors are clearly visible, so this is another proof about port injection.

Thank you jazzaro you really have been helpful on this post  :)
It will be alright in the end, if it's not alright then it's not the end !

jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #10 on: June 11, 2020, 10:26:25 AM »
Doh, I found a pic of a L13B2, the close up of the front side without intake manifolds: intake ports and fuel injectors are clearly visible, so this is another proof about port injection.

Thank you jazzaro you really have been helpful on this post  :)
You're welcome. :)
Anyway, Honda DI engines seem to be ok with this problem, both because the injector is placed laterally so it can partially spray fuel over the open intake valves (washing and cooling them), than because in LIVC Atkinson Cycle engines (as the 1.5 hybrid ICEs) there is a slight backstream of fuel mixture, and this is good for keeping intake valves clean.

TnTkr

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Re: Direct Injection - Carbon Build Up
« Reply #11 on: June 11, 2020, 11:21:27 AM »
There has been some cases about carbon buildup in direct injected L15B engines in US, which is also used in 1,5 GK5 Jazzes also in Europe, but that may due to low quality fuel compared to what we have here in Europe.

jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #12 on: June 11, 2020, 02:31:37 PM »
There has been some cases about carbon buildup in direct injected L15B engines in US, which is also used in 1,5 GK5 Jazzes also in Europe, but that may due to low quality fuel compared to what we have here in Europe.
Yep, low quality fuel but more probably low quality oil. Or short trips usage, so oil does not warm and it does not "purify itself" from water and fuel.

HungaryGK

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Re: Direct Injection - Carbon Build Up
« Reply #13 on: June 15, 2020, 07:53:26 PM »
Hi!

Honda Jazz GK 1.5 Earth Dreams
82000Km.
Hungary



jazzaro

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Re: Direct Injection - Carbon Build Up
« Reply #14 on: June 16, 2020, 08:53:28 AM »
Nice!
And how did you discover it? Why the engine is opened?

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