How to adjust....?
13-12-2005, 02:52 PM
#1
PassionFord Post Troll
Thread Starter
How to adjust....?
Hi peeps, just wondering how do you go about checking and adjusting the crankshaft end float of a typical engine?
also what methods are used to reduce piston side forces?
have a project thats due on thursday and these are the last 2 bits im stuck on so any help would be GREAT
bassboy
also what methods are used to reduce piston side forces?
have a project thats due on thursday and these are the last 2 bits im stuck on so any help would be GREAT
bassboy
13-12-2005, 02:58 PM
#2
Reduce piston side forces in what way?
when designing an engine from a blank bit of paper, or when rebuilding or building one from bought parts already designed?
Main thing is straightness of course, have a bent rod or similar and you are going to increase the side loading.
Not sure if thats what you mean?
With regards to end float, you check it with a dial guage, push the crank one way, set dial to 0, push it other way.
Its adjusted with thrust washers on centre bearing normally.
when designing an engine from a blank bit of paper, or when rebuilding or building one from bought parts already designed?
Main thing is straightness of course, have a bent rod or similar and you are going to increase the side loading.
Not sure if thats what you mean?
With regards to end float, you check it with a dial guage, push the crank one way, set dial to 0, push it other way.
Its adjusted with thrust washers on centre bearing normally.
13-12-2005, 03:07 PM
#3
PassionFord Post Troll
Thread Starter
hi chip thanx for the reply....im not exactly sure myself what is meant by the side forces...all that is written in the question is:
Describe the method adopted by the manufacturer of the engine allocated to your group for adjusting:
Valve clearences
Crank end float
Cam drive mechanism
and
what method was used to reduce the piston side forces?
:S
the engine was a Daewoo Matiz 3 cylinder engine but the information that we can give does not have to apply to that engine...
when i asked the lecturer he was saying something along the lines of where the gudgeon pin on the piston is and the height of the crank etc etc but he didnt properly explain it as he was in a rush to another lecture
also with the end float bit...what part of the crank are you actually checking? sorry to sound dumb but the guy in the lab forgot to do half the things we were meant to do hence us having to find out for any engine...
bassboy
Describe the method adopted by the manufacturer of the engine allocated to your group for adjusting:
Valve clearences
Crank end float
Cam drive mechanism
and
what method was used to reduce the piston side forces?
:S
the engine was a Daewoo Matiz 3 cylinder engine but the information that we can give does not have to apply to that engine...
when i asked the lecturer he was saying something along the lines of where the gudgeon pin on the piston is and the height of the crank etc etc but he didnt properly explain it as he was in a rush to another lecture
also with the end float bit...what part of the crank are you actually checking? sorry to sound dumb but the guy in the lab forgot to do half the things we were meant to do hence us having to find out for any engine...
bassboy
13-12-2005, 03:08 PM
#4
10K+ Poster!!
One method is to use one of the main bearings with a special design to the sides
The bearing on the top right is an example of that.
The side of the bearing matches with matching machines surfaces on the crankshaft. Different thickness of material on the bearing controls the end float of the crank.
Another method is to use C shaped washers.
These work in the same way but are just a different way of doing it.
Piston side forces are control by lots of things....
rod angle
bore / stroke ratio
you can reduce these by offsetting the piston pin (gudegon SP) or even off setting the crank jouran itself.
Hope that helps!
Alex
The bearing on the top right is an example of that.
The side of the bearing matches with matching machines surfaces on the crankshaft. Different thickness of material on the bearing controls the end float of the crank.
Another method is to use C shaped washers.
These work in the same way but are just a different way of doing it.
Piston side forces are control by lots of things....
rod angle
bore / stroke ratio
you can reduce these by offsetting the piston pin (gudegon SP) or even off setting the crank jouran itself.
Hope that helps!
Alex
13-12-2005, 03:25 PM
#6
PassionFord Post Troll
Thread Starter
thank you SO much for the input peeps!!!
what are you actually checking when you are checking for the end float of the crank? looking at stu's pic its to see if that surface is flat? or am i on the wrong lines here?
bassboy
what are you actually checking when you are checking for the end float of the crank? looking at stu's pic its to see if that surface is flat? or am i on the wrong lines here?
bassboy
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13-12-2005, 03:30 PM
#8
10K+ Poster!!
Originally Posted by bassboy
or is do you move the crank side to side to see if it moves the dial gauge?
Rember the clutch has to "push" on somthing... every action has an equal and oppsite reaction!
Alex
13-12-2005, 03:34 PM
#9
PassionFord Post Troll
Thread Starter
thanx everyone for their input...that question is now sorted...Stu hope u dont mind me using that pic in my report?
any help for the piston side forces by any chance?
bassboy
any help for the piston side forces by any chance?
bassboy
13-12-2005, 03:43 PM
#10
If you look at teh picture carefully you can see the crowbar i am moving the crank with 
Ive nothing around me to show rod angle though i must admit, you will have to do a diagram showing the differing forces that are present with differing stroke lengths. Look at teh difference between a 600 4pot bike engine and a long torquey 2.5litre 4 pot for an example.
Edited to add:
Use any pics you like of mine pal, no problem. Maybe there is some more you like in the CVH engine build topic i did, here: https://passionford.com/forum/viewtopic.php?t=99889
Ive nothing around me to show rod angle though i must admit, you will have to do a diagram showing the differing forces that are present with differing stroke lengths. Look at teh difference between a 600 4pot bike engine and a long torquey 2.5litre 4 pot for an example.
Edited to add:
Use any pics you like of mine pal, no problem. Maybe there is some more you like in the CVH engine build topic i did, here: https://passionford.com/forum/viewtopic.php?t=99889
13-12-2005, 03:53 PM
#11
10K+ Poster!!
Piston side forces are control by lots of things....
rod angle & bore / stroke ratio
This is basically to do with long and short stroke engines. The shorter the stroke, the great angle the rod will travel through.
Ways you can reduce this other than changing the bore:
You can reduce these by offsetting the piston pin (gudegon SP) or by off setting the crank journal itself. This alters the thrust angle of the conrod.
It also changes the exact piston pistion vs crank position - you can make the piston spend longer coming down the 1st half of the stroke (which is good for extracting force from the cylinder pressure! ie POWER). But thats probably not what you need to answer!
Alex
rod angle & bore / stroke ratio
This is basically to do with long and short stroke engines. The shorter the stroke, the great angle the rod will travel through.
Ways you can reduce this other than changing the bore:
You can reduce these by offsetting the piston pin (gudegon SP) or by off setting the crank journal itself. This alters the thrust angle of the conrod.
It also changes the exact piston pistion vs crank position - you can make the piston spend longer coming down the 1st half of the stroke (which is good for extracting force from the cylinder pressure! ie POWER). But thats probably not what you need to answer!
Alex
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