Comments on: Variable Compression Ratio Engine Concepts

By: Sam

Sam — Mon, 09 Apr 2012 07:31:13 +0000

” VCR has probably been made outdated by direct injection”
Not true, VCR can work with Direct Injection to yield greater fuel efficiency, more low end torque and reduce emissions. the SAAB VCR engine was running up to 14:1 compression with up to 30psi of boost.

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By: mdabduh.mdazhar

mdabduh.mdazhar — Tue, 12 Feb 2008 08:47:58 +0000

BRAVO…BRAVO….PROTON CAN DO IT..WELL DONE.

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By: Alifz

Alifz — Sun, 10 Feb 2008 05:07:28 +0000

Good to hear back the Variable Compresson Ratio engine is BACK, on production.

I’ve read read about this long time ago, i’ve think somewhere in 1999, as mentioned by Paul Tan by Saab, really good in paper but i think it’s not quite reliable cause the engine designed will have problem when switching the compression as top of piston is pivoting. Glad to hear at last Nissan had resolved this problem.

This engine is for sure a millenium revolutions, as what VTEC did it on nineties..

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By: proton GL

proton GL — Sat, 09 Feb 2008 06:53:46 +0000

anyway i do agree with paul,
VCR is too mechanical, and bulk,
DI is capable of a very lean combustion ..so,high efficiency enough and ,its a lighter solution for greater outcome,

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By: Scania Irizar

Scania Irizar — Sat, 09 Feb 2008 03:18:52 +0000

Yo Paul, Happy New Motoring Year man!

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By: syamdoll

syamdoll — Fri, 08 Feb 2008 09:53:41 +0000

is this system did’n have any problem???when this engine will used in malaysia????

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By: syamdoll

syamdoll — Fri, 08 Feb 2008 09:53:41 +0000

is this system did’n have any problem???when this engine will used in malaysia????

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By: proton GL

proton GL — Fri, 08 Feb 2008 04:47:08 +0000

saab way of doing seem like,
1st draft, idea,
nissan bit batter ,and claim smoother though multilink con rod look kinda,
for me, we always talk about mechanical llightness ,but if efficiency over rule than might be just batter,

we ll see if any comes with simpler way of VCR

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By: maibatsu_thunder

maibatsu_thunder — Fri, 08 Feb 2008 02:03:12 +0000

Yeah I remember reading about the Saab thing way back … its like some pistons sort of rocked the whole block up to lower the C/R.

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By: 4G63T DSM

4G63T DSM — Fri, 08 Feb 2008 01:00:24 +0000

I don’t think the additional complexities that come with the variable compression engines are worth the extra costs and complexities.

The future of internal combustion may as well lie with the Diesotto engine. Couple that engine with a hybrid system and you have an powertrain with a massive torque output as well as efficiency. Unfortunately however, Mercedes holds the patent to it.

If anything, the SAAB system is more efficient as it has less rotating mass.

However, the SAAB engine is designed in a time that direct injection petrol engines are just a rarity (only Mitsubishi’s GDI engine is in production) as the “GDI” has inherent emmisons issues due to the lean burn characteristics (high NOx). With the high NOx issue largely solved by manufacturers, we have a good selection of direct injection petrols (FSI/GDI..etc). I feel the VC engine has been made redundent by that development.

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By: LittleFire85

LittleFire85 — Thu, 07 Feb 2008 16:56:41 +0000

I think when Proton did it, is beyond 2020… If i not mistaken the saab engine is turbocharged wif SVC so it can have massive output. Proton dont even have a simple turbocharge engine until now…

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By: nmh

nmh — Thu, 07 Feb 2008 16:42:33 +0000

whoa…saab 1.6 engine var. compression can squeeze out 225bhp 305nm. yummy. How much actually our campro 1.6 capable. I believe campro also can do at least 150bhp 200nm….i mean, come on proton, you can do it

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By: LittleFire85

LittleFire85 — Thu, 07 Feb 2008 16:42:14 +0000

I tot this technology have been talk for quite sometime now… Now a lot of them are talking about turbo diesels wif hybrid system, i think this will even save more fc.

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By: Roti Naan

Roti Naan — Thu, 07 Feb 2008 15:25:58 +0000

That is good news esp. in the light of the ever increasing price of fuel. Cars need not rely big cc engines for power.

With more introduction of electronic in controlling engine functionality, one day, all the old uncle/sifu mechanics in Malaysia will go out of business. Slowly but surely.

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By: nmh

nmh — Thu, 07 Feb 2008 15:20:03 +0000

we can have normal vtec and type R vtec engine in one package. Push R button to race

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By: MaverickNeo

MaverickNeo — Thu, 07 Feb 2008 13:40:23 +0000

Hrmm…Variable compression ratio, interesting….and i thought that mankind has reached the peak in the evolution of the internal combustion engine…lolz…

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By: szw

szw — Thu, 07 Feb 2008 13:21:41 +0000

that is smart…

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By: nmh

nmh — Thu, 07 Feb 2008 12:15:58 +0000

Paul I really need your review comparison between Captiva, Santa Fe and Everest complete with test drive. Its a very hard decision esp between Captiva Diesel and Santa Fe diesel. I think Everest a little off the league since its based on pickup truck which comparable to Fortuner.

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By: nmh

nmh — Thu, 07 Feb 2008 12:11:52 +0000

Now everything in the engine can be variable. Variable displacement, var valve timing, etc. In future maybe we dont have to chose engine variant. Everything all in one and we can simply switch it on and off

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