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  #91  
Old 11-12-2013, 01:03 PM
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Quote:
Originally Posted by Stretch View Post
I think I'll swap the combined set in cylinder 3 with cylinder 4 so that the heaviest is next to the flywheel.
Looks good! Think I would have gone to the same O.C.D. behavior as you, as got to be close to perfect as possible!

Why put the heaviest to the flywheel?

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  #92  
Old 11-12-2013, 01:17 PM
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Quote:
Originally Posted by Stretch View Post
Thanks for the vote of confidence - I hope I haven't cocked it all up and taken out too much strength. Still this is the only way to learn!

Here's my final configuration



I think I'll swap the combined set in cylinder 3 with cylinder 4 so that the heaviest is next to the flywheel.
I'd whittle down the con rod's weight a gram... shouldn't take much.
which end is heaviest?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #93  
Old 11-12-2013, 01:29 PM
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Originally Posted by Stretch View Post
Have you got a link for your project?

(I guess you're on STD?)
I spent a good half hour grinding the plate, then taking it the shop, machine setup, turning so it would be pretty, and if you wanted to count it milling down the vac cover and brazing it up pretty







I probably gained like 0.75HP there
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  #94  
Old 11-12-2013, 05:01 PM
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Originally Posted by Adriel View Post

Why put the heaviest to the flywheel?
In the simple - over simple case - the crank is like a long beam with a big weight on the end (flywheel). Although the beam is supported at several points (main bearings) it will have a tendency to bend like a banana along its whole length. This is an exaggerated example of behaviour but there is usually a detectable vibration that is closely related to the length of the crank.

If you're adding four "bouncing" weights (pistons going up and down) at four different points along the beam you are better off putting the heaviest of these bouncing weights at the closest position to the big weight at the end of the beam (flywheel). This is because the effect of the heaviest piston is the least on the whole banana bending effect (that you might be able to imagine) of the beam when it is closest to the big dominating weight at the end (flywheel).

If you do the opposite and stick the heaviest piston furthest away from the flywheel then you might find that you exaggerate the banana bending effect and excite this vibration that is proportional to the length of the crank.

Generally speaking for most "normal" situation vibrations related to large parts of a machine are more of a problem because they often happen within "normal" operating speeds. So you want to avoid exciting / influencing / provoking the big stuff!

This whole model / approximation of bouncing weights on a beam with a big weight attached to the end of it supported at various points along its length, however, gets really complicated when you include the effects of combustion and sudden changes in engine speed...
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



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  #95  
Old 11-12-2013, 05:06 PM
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Originally Posted by vstech View Post
I'd whittle down the con rod's weight a gram... shouldn't take much.
which end is heaviest?
The conrod in the set up for cylinder 3? I could do - it would be nice. I'll have a look at it tomorrow

Do you mean which end of the conrod is heaviest? If so I feel a smart arse response coming on - the big end!
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #96  
Old 11-12-2013, 05:08 PM
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Originally Posted by Simpler=Better View Post
...
I probably gained like 0.75HP there
With out a doubt - you'll be flying along.

Did you do any porting work and unswept volume balancing acts on the head?
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #97  
Old 11-12-2013, 09:15 PM
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Originally Posted by Stretch View Post
With out a doubt - you'll be flying along.

Did you do any porting work and unswept volume balancing acts on the head?
What do you think I am, a ham shanker?

My OM617 Build

When it goes from storage to wrenching I'll probably post up a duplicate build thread here
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  #98  
Old 11-12-2013, 09:22 PM
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Quote:
Originally Posted by Stretch View Post
The conrod in the set up for cylinder 3? I could do - it would be nice. I'll have a look at it tomorrow

Do you mean which end of the conrod is heaviest? If so I feel a smart arse response coming on - the big end!
no arse... I mean which end compared to all the others is heaviest? is it the big end that's 2 grams heavier than the rest, or the small end or is it equal?

cause like I said early in this thread, the big end is counted differently from the small end on the balance of the whole....
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #99  
Old 11-13-2013, 04:26 AM
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Originally Posted by vstech View Post
no arse... I mean which end compared to all the others is heaviest? is it the big end that's 2 grams heavier than the rest, or the small end or is it equal?

cause like I said early in this thread, the big end is counted differently from the small end on the balance of the whole....
I thought you meant something like that - I've been avoiding that making that comparison because (and you may have noticed this with me) I tend to get sucked into things a bit and I end up wasting my limited time...

...I'm kind of hoping that making an over all weight comparison I'm gonna be more or less good.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #100  
Old 11-13-2013, 04:29 AM
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Originally Posted by Simpler=Better View Post
What do you think I am, a ham shanker?

My OM617 Build

When it goes from storage to wrenching I'll probably post up a duplicate build thread here
Ah ha there it is!

(I don't really think you'd be calling yourself that if you knew what I meant when I say it! It is a reference to masturbation {don't you know})
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #101  
Old 11-13-2013, 11:28 AM
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Originally Posted by Stretch View Post
Ah ha there it is!

(I don't really think you'd be calling yourself that if you knew what I meant when I say it! It is a reference to masturbation {don't you know})
I spend time and money working on 30 year old 100hp cars, when I could have built a hotrod turbo 4.6L V8 gasser for about the same investment. Technically, all I ever do is shank around in the shop...just with diesels and money

But yeah, I think Ham Shanker is the funniest way I've heard it put and it makes me snort so we're good
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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment
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  #102  
Old 11-13-2013, 02:34 PM
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Originally Posted by Simpler=Better View Post
I spend time and money working on 30 year old 100hp cars, when I could have built a hotrod turbo 4.6L V8 gasser for about the same investment. Technically, all I ever do is shank around in the shop...just with diesels and money

But yeah, I think Ham Shanker is the funniest way I've heard it put and it makes me snort so we're good
Cool - I didn't want you to have a nasty shock...

...so I guess you're the man to take on my direct injection OM617 project? (that's all in my head at the moment - a bit like mega squirt for your diesel)
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #103  
Old 11-13-2013, 04:04 PM
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Originally Posted by Stretch View Post
Cool - I didn't want you to have a nasty shock...

...so I guess you're the man to take on my direct injection OM617 project? (that's all in my head at the moment - a bit like mega squirt for your diesel)
When the time comes I can turn injector holders to replace the prechambers.

Fair warning, I'm beyond slow when it comes to making parts

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