Pagoda SL Group

W113 Pagoda SL Group => General Discussion => Topic started by: Naj ✝︎ on October 25, 2007, 06:11:19

Title: Suck, Squeeze, Bang, Blow.
Post by: Naj ✝︎ on October 25, 2007, 06:11:19
Here's how it works:

http://www.gizmodo.com.au/2007/10/micro_camera_shows_the_working.html


10/27
 :?:  :?:  :?:  :?:  :?:

Okay, everybody,
Now look again and see when the spark occours: aTDC or bTDC?

naj

68 280SL
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: mbzse on October 25, 2007, 13:28:15
quote:
Originally posted by naj

Here's how it works:
http://www.gizmodo.com.au/2007/10/micro_camera_shows_the_working.html
naj

That really is some spectacular filming... And the events going on in there actually are just like we all have read and seen on all those cut-open engine illustrations ;)

.

/Hans in Sweden
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: J. Huber on October 25, 2007, 14:45:37
Wow. So which side is the intake?

And if I have it right:

suck = intake
squeeze = compression
bang = combustion
blow = exhaust

James
63 230SL
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: Paddy_Crow on October 25, 2007, 14:57:35
quote:
Originally posted by J. Huber

Wow. So which side is the intake?

And if I have it right:

suck = intake
squeeze = compression
bang = combustion
blow = exhaust

James
63 230SL


Intake is to the right. The clip ends with the exhaust valve open, so maybe 90 of the 720 degree cycle is missing.

Democracy is two wolves and a lamb voting on what to have for lunch...
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: al_lieffring on October 25, 2007, 15:01:25
quote:
Originally posted by J. Huber

Wow. So which side is the intake?

And if I have it right:

suck = intake
squeeze = compression
bang = combustion
blow = exhaust

James
63 230SL


The intake valve is always the larger of the two,
so the intake valve apears to be the one on the left.

With that being the case, then this video is actually playing backwards,
The visible gas would be the exaust and should be flowing out the smaller (exaust) valve. the fuel vapor would most likely not be visible because the comcentration of fuel to air is so low. Most of the intake stroke has been edited out.


Al Lieffring
66 230Sl
a-cheesin with a new 85 l. tank
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: Paddy_Crow on October 25, 2007, 16:38:04
quote:
Originally posted by al_lieffring

quote:
Originally posted by J. Huber

Wow. So which side is the intake?

And if I have it right:

suck = intake
squeeze = compression
bang = combustion
blow = exhaust

James
63 230SL


The intake valve is always the larger of the two,
so the intake valve apears to be the one on the left.

With that being the case, then this video is actually playing backwards,
The visible gas would be the exaust and should be flowing out the smaller (exaust) valve. the fuel vapor would most likely not be visible because the comcentration of fuel to air is so low. Most of the intake stroke has been edited out.


Al Lieffring
66 230Sl
a-cheesin with a new 85 l. tank


I believe the clip is running forward.

It is true that the intake valve is larger, but I can't tell which is actually larger. It is an extremely wide angle lens, so there is significant distortion in the image.

The main reason I believe it is running forward is that the combustion stroke should begin with the piston close to TDC and continue as the piston moves down, which it does in this clip. If it were running backward, it would look as though combustion started at the bottom of the stroke and ended at the top.

Democracy is two wolves and a lamb voting on what to have for lunch...
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: al_lieffring on October 25, 2007, 16:52:27
I looked at the clip again and I agree, the spark is before the fire starts so it is running forward,

The smoke could have been added to the intake for studying the intake swirl pattern of the comubustion chamber,

Al Lieffring
66 230Sl
a-cheesin with a new 85 l. tank
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: Paddy_Crow on October 25, 2007, 17:20:20
quote:
Originally posted by al_lieffring

I looked at the clip again and I agree, the spark is before the fire starts so it is running forward,

The smoke could have been added to the intake for studying the intake swirl pattern of the comubustion chamber,

Al Lieffring
66 230Sl
a-cheesin with a new 85 l. tank


I believe you are seeing atomized fuel during the intake stroke. It appears to be IVO port fuel injected. Injector is targeted at the top of the intake valve, which would be pretty normal.

Democracy is two wolves and a lamb voting on what to have for lunch...
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: PnHi on October 26, 2007, 07:56:01
So... When an engine is doing 6,000 rpms this process is repeated how many times per second?
Title: Re: Suck, Squeeze, Bang, Blow.
Post by: Klaus on October 26, 2007, 08:06:36
quote:
So... When an engine is doing 6,000 rpms this process is repeated how many times per second?


50 times (per cylinder)

Klaus
1969 280 SL