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[Shackeng]

Mark's excellent how to requires the upper tail to point to the rear of the vehicle. Looking at the OE springs removed, this would appear to offer no problem, given the tapered tails which fit neatly inside the last fat spring coil. However the aftermarket BOGE springs I am fitting are the same diameter throughout, and the tail is chopped off square and not recessed into the penultimate coil. If the spring is fitted as recommended the sharp fat bottom tail is at the front, and as it is compressed the  lower sharp coil end digs deeply into its rubber mounting plate, and within a few miles will be grinding into the steel base plate beneath. However if turned through 90' the fat part of the last coil sits on the rubber.
For what reason is it required to face the upper tail to the rear, given that the upper spring mount remains almost square throughout the range of movement, whereas the angle of the bottom mount alters continuously.?

[Shackeng]

Perhaps this only specifically applies to OE spring fitment. I would welcome an expert opinion.

[chrisgixer]

Summats not right there. A pic perhaps?

[Shackeng]

Summats not right there. A pic perhaps?

I could post one tomorrow, but the new springs are - temporarily - in place prior to bolting up the axle. I imagine you have come across this Chris when fitting aftermarket springs.

[Shackeng]

Perhaps I should re-word this:
When members have fitted after market BOGE rear springs, are they happy with the position of the bottom tail pointing forward when the upper tail is pointed to the rear of the car?

[chrisgixer]

Top,points to the rear to avoid whistling in air flow.

Description of the springs sounds odd though.

[Shackeng]

Top,points to the rear to avoid whistling in air flow.

Description of the springs sounds odd though.

I'll drop one out tomorrow and photo alongside the old ones.

Can't see it whistling hidden up there!

[chrisgixer]

Top,points to the rear to avoid whistling in air flow.

Description of the springs sounds odd though.

I'll drop one out tomorrow and photo alongside the old ones.

Can't see it whistling hidden up there!

No, but you might hear it. . ...might

I don't think it matters, other than that slight off chance of a whistle.

[Shackeng]

Top,points to the rear to avoid whistling in air flow.

Description of the springs sounds odd though.

I'll drop one out tomorrow and photo alongside the old ones.

Can't see it whistling hidden up there!

No, but you might hear it. . ...might

I don't think it matters, other than that slight off chance of a whistle.

Definitely not with Shack-ear!

If that's the only reason,then I'll leave them in at a position which seems sensible in engineering terms to me, as I prefer not to take one out just to take a pic.

[chrisgixer]

I did say might.

Wasn't suggesting remove spring.

The lower arm obviosly works on a radius. So will have parrallel surfaces at a point near or beyond full compression. As the arms drops that radius/parallel relationship is maintained. (Sorry don't know the geometric terms)

So with that in mind, your description if the tail end digging of the spring digging in the spring cup concerns me, as the base of the springs should be shaped to cope.

If the aping diggs in, it could force the arm over on the bushes, if u nderstand it correctly?    ...."Could"

But as long as your happy.

[Shackeng]

I did say might.

Wasn't suggesting remove spring.

The lower arm obviosly works on a radius. So will have parrallel surfaces at a point near or beyond full compression. As the arms drops that radius/parallel relationship is maintained. (Sorry don't know the geometric terms)

So with that in mind, your description if the tail end digging of the spring digging in the spring cup concerns me, as the base of the springs should be shaped to cope.

If the aping diggs in, it could force the arm over on the bushes, if u nderstand it correctly?    ...."Could"

But as long as your happy.

?


Its probably worth saying that the KYB springs shown in the How to look identical in design to the OE springs, where the BOGE are much cruder, and are the same diameter throughout.

[Shackeng]

Got it 'spring' 

[Shackeng]

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As you can see from the pic, the tail of the new spring is just chopped off square and is normal spring diameter, whereas, although not obvious here, the OE tail is tapered, and tucked in almost level with its next coil. If this is mounted as per the guide, the new tail is at the front, and, as the swinging arm moves up in an arc it gouges into its rubber base plate, and will be contacting the metal base in about 10 miles!

[TheBoy]

I have never paid much attention to where the bottom points, just the top pointing rearwards.

[Shackeng]

I have never paid much attention to where the bottom points, just the top pointing rearwards.

Any idea why this is required?

The best position for these BOGE springs to avoid gouging by the tails, top or bottom, is 90' from the recommended position.