18:1cr on PETROL!!

ryeman · 03-12-2013, 08:37 PM

Mazda has plans to up its skyactive engines fm 14-18:1cr on petrol report fm GOAUTO.
It's 14:1 engines run on CNG as well but surely not at 18:1.

mcnews · 03-12-2013, 09:18 PM

With modern cylinder head design and engine management this might be doable. A lot of bikes are running 14:1 now.

ryeman · 03-12-2013, 09:27 PM

There was a time when Honda were THE leaders in engine tech, certainly not now.

madmelon · 03-12-2013, 09:31 PM

The 18:1 CR engines are expected to be HCCI engines, so not your typical petrol engine.

ryeman · 03-12-2013, 09:45 PM

Quote:

Originally Posted by madmelon

The 18:1 CR engines are expected to be HCCI engines, so not your typical petrol engine.

Yeah, but COMPRESSION IGNITION !!?

XR Martin · 03-12-2013, 09:52 PM

Quote:

Originally Posted by ryeman

There was a time when Honda were THE leaders in engine tech, certainly not now.

Problem is Mazda is still playing with N/A engines when everyone else is going turbo.
This could be like how they were the only ones who eventually played with rotors.

ryeman · 03-12-2013, 10:02 PM

Quote:

Originally Posted by XR6 Martin

Problem is Mazda is still playing with N/A engines when everyone else is going turbo.
This could be like how they were the only ones who eventually played with rotors.

Their target is a competitive NON turbo (without all the higher real costs over time) but with ultra low fuel consumption.
I wouldn't want the complexity of a TSI4 long term, false economy but reasonable brochure figures.

XR Martin · 03-12-2013, 10:30 PM

Quote:

Originally Posted by ryeman

Their target is a competitive NON turbo (without all the higher real costs over time) but with ultra low fuel consumption.
I wouldn't want the complexity of a TSI4 long term, false economy but reasonable brochure figures.

LOL.
If anyone is fudging economy figures its Mazda, I dont think anyone has gotten close to their claims with their new engines.
Wheels long term CX5 2.5 is averaging 11.5L/100km

ryeman · 03-12-2013, 10:33 PM

^^^so who do YOU trust?

ratter · 04-12-2013, 08:27 AM

please disregard

madmelon · 04-12-2013, 08:27 AM

Quote:

Originally Posted by ryeman

Yeah, but COMPRESSION IGNITION !!?

Yes, compression ignition, but only up to a certain rpm- after that, spark ignition takes over. HCCI is a very efficient way of operating in comparison to SI.

chevypower · 04-12-2013, 08:42 AM

They lowered the CR on their diesels, so now are their petrol engines higher CR than their diesels? Aren't their diesels like 14:1 now?

ryeman · 04-12-2013, 08:54 AM

Quote:

Originally Posted by chevypower

They lowered the CR on their diesels, so now are their petrol engines higher CR than their diesels? Aren't their diesels like 14:1 now?

Manufacturers seem to be moving away fm Diesel engines now with Honda about to introduce their first here.

Rodge · 04-12-2013, 10:19 AM

Quote:

Originally Posted by chevypower

They lowered the CR on their diesels, so now are their petrol engines higher CR than their diesels? Aren't their diesels like 14:1 now?

Yes they are, go figure.

Quote:

Originally Posted by ryeman

Manufacturers seem to be moving away fm Diesel engines now with Honda about to introduce their first here.

That'd be Honda's "cunning" marketing stratagy.

ryeman · 04-12-2013, 11:04 AM

I bought a,new Civic in'73 and have been a fan, at least of their engines, ever since but their distraction with its last failed effort in F1 (not to be confused with its previous success) seems to have had a disastrous effect on its R&D and thus sales performance over the last decade now.
Peugeot is now phasing out diesels with small capacity turbo petrol.
With the phasing out of local refining, high quality petrol will come by tanker fm Singapore it seems and then we might have cutting edge HCCI engines here.
There will be big winners and big losers come out of this perhaps with so many competing technologies....gas,petrol,solar/battery, diesel...........

mcnews · 04-12-2013, 12:46 PM

Three letters.... GFC..... Most Japanese manufacturers virtually halted all R&D and spending. What we are starting to see now we would originally have seen four years ago.

ryeman · 04-12-2013, 01:04 PM

Quote:

Originally Posted by mcnews

Three letters.... GFC..... Most Japanese manufacturers virtually halted all R&D and spending. What we are starting to see now we would originally have seen four years ago.

But Mazda had on just crawled out of its hole before the GFC and yet now with its product range is set to take advantage of VW's stumble over QC.
(SAE Int has an extensive article on the 2014 Mazda3 and it's HMI)

**ebxr8240** · 04-12-2013, 08:06 PM

Did compression ratios drop in diesels to add extra boost being turbo charged ??

ryeman · 04-12-2013, 09:49 PM

My guess is it was to do with euro emission requirements.

**ebxr8240** · 05-12-2013, 12:04 AM

The Mitsi 4WD has lower comp, more boost, more power over the 2WD..
Yes pumping more air through diesel engine will possibly help emissions..

Bossxr8 · 05-12-2013, 04:57 PM

GM and Mercedes are both doing a lot of development on these "diesotto" engines. It's probably the next big thing in engine development, combining the best features of diesel and petrol engines.

imugli · 05-12-2013, 05:12 PM

Hyundai is working on a CI petrol engine as well, so it seems there's a fair bit of backing for it...

Franco Cozzo · 05-12-2013, 08:12 PM

Quote:

Originally Posted by ebxr8240

Did compression ratios drop in diesels to add extra boost being turbo charged ??

Its only direct injection turbo diesels which seem to have the lower compression ratios, my IDI 6.5L TDV8 is 20.3:1, but it only runs about 8psi boost and thats a factory setup.

Focus is something in the 16:1 range but runs 16psi.