tim's wrx

thought this was interesting


http://www.subaru.com.mt/html/leftfr...300/index.html

Paulo P

iTrader: (42)

That's an interesting thought. I wonder if it really makes any difference though.

banny sti

iTrader: (68)

Flat four layout is smoother as the opposing pistons cancel the vibrations out. Looking good in jap tuner mag paul!

James Neill

iTrader: (1)

The inline model shows the crank shaft going up and down. Is that really right?

ALi-B

iTrader: (1)

Something else of interest:

http://www.e31.net/engines_e.html

Yup nice and smooth...Only for it all to be messed up by unequal length headers

Can't beat a straight 6 or V12 though

Bubba po

Only in an extremely exaggerated way. It's showing the direction of vibration, not the true extent.

Bubba po

Which makes it sound wonderful.

ALi-B

iTrader: (1)

Anders_WR1

iTrader: (8)

Is the design on the two cylinder right? It seems mad to have the pistons going up and down at the same time. Why not have them split by 180 degrees like this?

http://www.billandelaine.co.uk/scoobystuff/2c.jpg

Anders

wide

Isnt that the reason for engine mountings

ALi-B

iTrader: (1)

Yup it is correct: It's a parallel twin...almost every old British twin cylinder motorbike ever made is like that (one cylinder at TDC on exhaust, other at TDC on compression/ignition). Gives a great sensation through the nads when you wind them up to 5000rpm

Welloilbeefhooked

iTrader: (3)

Its not the crank that is going up and down, its the centre of gravity that the engine is altering slightly. Think I'm right on this.

ALi-B

iTrader: (1)

What is interesting is on bikes is the gyroscopic effect. An engine with a large rotating mass will actually be harder to lean into bends. You'd think just teh wheels would cause this, obviously. But the engine does too.

I doubt it would have any effect on a car as the overall weight difference of the chassis vs rotating mass of the engine is far too negliable to have any effect. And the balance of the engine would be a similar story.

Gary C

what bollocks, how many inline car engines have a single cyclinder or all 4 going up and down together.

when 2 are going up, 2 are going down. The masses are roughly balanced and some 4's have a balancer shaft to ofset the small amount of imbalance in a 4 but its more for NVH than any affect on the chassis.

Marketing bollocks

Baggers

fantastic links, interesting reading. Maybe an insight into the scoob vs evo maintenance / failure related experiences.

KiwiGTI

http://en.wikipedia.org/wiki/Image:4-Stroke-Engine.gif

looks nicer.

KiwiGTI

This was interesting too.

http://en.wikipedia.org/wiki/Boxer_engine

Anders_WR1

iTrader: (8)

So what's the technical benefit, apart from making the bird on the back of your bike smile? Couldn't you fit smaller weights on the crank if it was designed the other way?