V-compression to kick in YO!| Grassroots Motorsports forum |

drummerfromdefleopard GRM+ Memberand SuperDork
4/27/15 2:11 p.m.

http://www.gizmag.com/porsche-variable-compression-engine-patent/37186/

Porsche and Hilite patent a variable compression system, theoretically to work in conjunction with direct injection turbo applications to increase efficiency and decrease turbo lag.

Swank Force One MegaDork
4/27/15 2:22 p.m.

No sir i do NOT want it.

drummerfromdefleopard GRM+ Memberand SuperDork
4/27/15 2:30 p.m.

dean1484 GRM+ Memberand MegaDork
4/27/15 2:42 p.m.

A huge question mark still hangs over whether the resulting engine will be cheap

Really. New technology from PORSCHE cheap? Did pigs fly today or something?

Fueled by Caffeine MegaDork
4/27/15 2:49 p.m.

Saab did variable compression a little bit ago. Iirc the head was hinged on one side to the block and hydraulics moved it up and down.

Fueled by Caffeine MegaDork
4/27/15 2:57 p.m.

http://www.saabnet.com/tsn/press/000318.html

edizzle89 Reader
4/27/15 3:18 p.m.

i've had cars with variable compression before, it just depends on which cylinder you put the compression tester

Swank Force One MegaDork
4/27/15 3:20 p.m.

My variable compression device is called a "turbo."

Fueled by Caffeine MegaDork
4/27/15 3:45 p.m.

https://www.youtube.com/watch?v=oxR-3Un6WkU So weird to see the head tilt.

codrus GRM+ Memberand Dork
4/27/15 3:49 p.m.

Hm. I can't think of any way that rod design could possibly go horribly wrong. :)

Still, cool tech.

rob_lewis SuperDork
4/27/15 4:38 p.m.

Really cool idea. As the article stated, Porsche is on it just from a consulting aspect. Anyone could use it. I think that 20 years ago, it'd be a pipe dream, but with the incredibly low tolerances of modern engine building, this could be viable.

I guess I'm just a sucker of any new automotive technology that doesn't include batteries or cars that drive themselves.....

-Rob

The0retical Dork
4/27/15 5:17 p.m.

Interesting. I do wonder how it would hold up as the bearings wear though.

mad_machine GRM+ Memberand MegaDork
4/27/15 6:51 p.m.

Fueled by Caffeine wrote: https://www.youtube.com/watch?v=oxR-3Un6WkU So weird to see the head tilt.

imagine replacing that gasket

T.J. PowerDork
4/27/15 6:52 p.m.

Interesting. I would've guess a normal piston and the trickery in the head, not a fancy rod.

Knurled GRM+ Memberand UltimaDork
4/27/15 6:57 p.m.

I'd rather get the variable compression with adjustable intake cam timing. Which is already here. And doesn't berk up the combustion chamber.

t25torx HalfDork
4/27/15 7:12 p.m.

Combined with Direct Injection, and the Cargine FreeValve system you could get a 90mpg 1.8L with 160hp still. It would be a bitch to service though.

Knurled GRM+ Memberand UltimaDork
4/27/15 7:13 p.m.

In reply to t25torx:

Aw man, the engineers on Speedtalk had a field day with that nonsense...

Toyman01 GRM+ Memberand MegaDork
4/27/15 7:39 p.m.

Swank Force One wrote: No sir i do NOT want it.

Holy oil pan full of tiny parts. Agreed.

Toyman01 GRM+ Memberand MegaDork
4/27/15 7:42 p.m.

Fueled by Caffeine wrote: https://www.youtube.com/watch?v=oxR-3Un6WkU So weird to see the head tilt.

That makes much better sense than that abortion of a rod posted above.

WilberM3 Dork
4/27/15 9:29 p.m.

i'd hate to see the effect extended length oil services have on a system like this

Mitchell UltraDork
4/28/15 12:47 a.m.

dean1484 wrote:
A huge question mark still hangs over whether the resulting engine will be cheap
Really. New technology from PORSCHE cheap? Did pigs fly today or something?

Porsche is going mainstream. They even make a hybrid now.