nib1980
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| posted on 25/10/09 at 11:36 AM |
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Engine Alignment - what can you do?
Hi All
I'm in the process of fitting the new engine (4age)
I've made the diagram below
Apologies for the size
I know the ideal condition is setup A, all perfectly inline with the centre line of the chassis.
But i can't do this because of fouling issues with the gearbox with the chassis and clutch cylinder.
SO
Should I move the engine and gearbox be parralell to the chassis centre line and put a angle in the prop.
OR
move the engine tokeep the prop in line square to the gearbox, and have an angle at only the diff end?
OR
can i do something else?
Many thanks
[img][/img]
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prawnabie
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| posted on 25/10/09 at 11:41 AM |
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Ideal alignment is not A, the engine needs to be offset to avoid brinnelling of the prop joints!
Try to get the propshaft at a different angle to bothe the box and the diff flanges as this will vastly affect the longevity of the Uj's!
[Edited on 25/10/09 by prawnabie]
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A1
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| posted on 25/10/09 at 11:44 AM |
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id say setup B. mine is like that.
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speedyxjs
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| posted on 25/10/09 at 11:48 AM |
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Mine is more like B. It helps with weight distribution (if car is RHD) and also helps the UJ and they can seize if they arnt being operated at an
angle.
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britishtrident
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| posted on 25/10/09 at 11:54 AM |
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Has to be set up A anything else will cause unequal angles in the UJ which will cause cyclic vibration. Also as already said having the engine prop
and diff set up without an offset (the offset can be either in the horizontal or vertical plane or a combination) is a bad thing, ideally the diff
input shaft and the gearbox output shaft should be parallel but offset.
If parallel the angles in the front and rear UJ are the same the cylic velocity variations due to angular deflections cancel each other out. See
Double Cardan Shaft http://en.wikipedia.org/wiki/Universal_joint
[Edited on 25/10/09 by britishtrident]
[Edited on 25/10/09 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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blakep82
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| posted on 25/10/09 at 02:06 PM |
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gearbox output, and diff flange should be parallel, but you need an angle in the prop
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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maartenromijn
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| posted on 25/10/09 at 02:16 PM |
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I would go for setup A only.
1. Place the engine and gearbox further forwards, us a longer propshaft
2. Modify the chassis
BLOG: http://thunderroad-super7.blogspot.com/
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blakep82
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| posted on 25/10/09 at 02:56 PM |
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what diff/axle are you using?
just a thought, so could be wrong, angle the gearbox up, and the diff flange down (so they're still parallel) as much as reasonably possible,
just to get a bit of angle in there
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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02GF74
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| posted on 25/10/09 at 05:29 PM |
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i'm in agreement with BT.
any up/down axle movement iwll pit some amngle on the UJs - not convinced about having to run them on an angle.
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RAYLEE29
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| posted on 25/10/09 at 05:42 PM |
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I find this interesting having been an engineer in many factories that use propshafts it is inmo usual to have the input flange and out put flange
parallel but the shaft at an angle
in your case id say move the engine g/box assy across but keep the crankshaft/gbox shafts inline/parallel to the centreline of the chassis you can
also have it above the diff input shaft too
the shaft doesnt care if its offset in any particular direction as long as the flanges are parallel hope this makes sense
Ray
p.s. above it says about brinnelling can someone explain this to me as i havent heard the expression before pls?
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prawnabie
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| posted on 25/10/09 at 05:45 PM |
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http://en.wikipedia.org/wiki/Brinelling
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turbodisplay
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| posted on 25/10/09 at 05:56 PM |
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Option b, but use a cv joint. I think my celica gt4 has a cv joint in the prop, could be a cheap donor?
You will probally need two cv joints, then a centre bearing, then two uj, or just two cv joints.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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RAYLEE29
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| posted on 25/10/09 at 06:58 PM |
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thanks prawnabie and sorry for hijacking the thread
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scutter
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| posted on 25/10/09 at 09:44 PM |
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I would say Set up A, angle for the UJ's will be taken up by the axle being below the level of the gearbox. Sorry for Very poor pic!! I am
ashamed!!
 
ATB Dan.
[Edited on 25/10/09 by scutter]
The less I worked, the more i liked it.
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MikeRJ
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| posted on 25/10/09 at 11:27 PM |
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Setup C is ok if the angles between the gearbox and prop and the prop and diff are equal. The Strikers engine is like this.
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