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740 Bilsteins in 240?

SteveMD

Membro
Joined
Feb 15, 2004
Location
Well, I switched baristas.
Call this a tb memory test. I am pretty sure a few years ago someone mentioned 740 Bilsteins worked good in the rear of the 240, valving better than 240 Bilsteins. Anyone recall that?
 
Here are the specs for each car's shocks from the Monroe catalog (too bad bilstein doesnt publish all this info, but it should be close for the bilsteins too I'd imagine)

240 rear:
Part Number: 5868
Upper Mount: LS38 - 1/2" hole with a 1.5" long sleeve
Lower Mount: LS30 - 12mm hole with a 1 7/8" long sleeve
Collapsed Length: 11.500
Extended Length: 17.500
Travel: 6.000

740 Rear:
Part Number: 5930
Upper Mount: LS32 - 12mm hole with a 2.125" long sleeve
Lower Mount: LS32 - 12mm hole with a 2.125" long sleeve
Collapsed Length: 11.875
Extended Length: 18.375
Travel: 6.500

So the lengths are pretty close, a little less compression stroke but a bit more droop with the 740's.
And it looks like the 740 mounting holes would have to have the sleeves shortened and possibly the upper one drilled out to 1/2".

Perhaps you could try contacting Bilstein for the shock valving info (if you do that post it up here because I'd like to know too), but it would stand to reason that the heavier car would have a bit stiffer shocks.

Edit:
And now that you got me looking through the monroe catalog the 960 and S90 rear shocks are pretty close too:

S90
Part Number: 5978
Upper Mount: LS32 - 12mm hole 2.125" long sleeve
Lower Mount: LS83 - 18mm hole 2" long sleeve
Collapsed Length: 12.125
Extended Length: 19.125
Travel: 7.000

960
Part Number: 5979
Upper Mount: LS32 - 12mm hole 2.125" long sleeve
Lower Mount: LS83 - 18mm hole 2" long sleeve
Collapsed Length: 12.125
Extended Length: 19.125
Travel: 7.000

It would be some work to fit those, too, because of the different sized mounting eyes. But probably do-able.
The size specs between the 960 and S90 shocks are all the same, but having different part numbers I'd assume the valving was different.

Just more for you to think about I guess.
 
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Say, fellas. I have installed two set of Bilsteins in my '81 240 GLT Turbo and both sets made noise; specifically, the shocks had internal knocking. Bilstein provided the second set and same problem. (I had a set of Bilsteins in my '81 242DL without problems; however, in the 240 GLT Turbo they knocked). I took them out and replaced with KYB gas and voila! - no noises. Have you or anyone else noticed this? Is this the impetus for going with the 740s?

Any insight would be appreciated. I rebushed the rear end and the only variable was the shocks. I can see no other reason. Bilsteins in - noise; KYB's in - silence (but not the ride I want). I'm absolutely stumped. I want to install the suspension kit and I really like the control of the Bilsteins. Perhaps as an alternative the Koni's may work but I have no experience with them as I have always used Bilsteins.


What say ye?
 
Maybe because they're stiffer than the KYBs they require the upper and lower mounting bolts/nuts to be even tighter and/or they're bringing out a flaw in your car's aged body? Check the tightness of the upper mount on the inside of the framerails. These nuts should be about as tight as you can get them.

Regarding the 700 rear shocks vs. the 200s, I'd much rather have the shorter of the two at full droop as it will put your axle on the exhaust, AND they will allow your rear springs to come further unseated(not good if you have cut and/or lowering springs).
 
The rear 740 Bilsteins I have, are the weeny little 40mm OD body, rather than the 50mm OD body of my 240 Bilsteins.

All three sets are HDs.

Its probably irrelevant for a road car, but the larger body has been proven to be significantly better in motorsport applications (bigger valve area, greater oil volume, etc) and I'd prefer the 50mm bodies.

Internal knocking? All the time? Just over big bumps? Big solid 'thunk' or a lighter, rattly 'clink'?
I've never had it happen, nor have I spoken to anyone who's had it, but I've seen this mentioned a few times on the internet...
My first thought is similar to klr's.
Second thought is to check whether you can replicate it by compressing the shock on the ground. There's just not that many bits inside a monotube shock.
Either its the external bump-stop plate (often not fitted to shocks where the shock doesn't incorporate the bump stop, like a 240/740 rear), or its the valve piston - if its the valve piston then you should be able to feel something wrong with the shock's action in your hands (mostly likely a 'loose spot' where the shock does nothing, particularly on the transition from compress to extend.
 
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Good enough - thanks for the input. It was only noticeable over light choppy roads at lower speeds where I could hear it. Actually, I had this happen with some Monroes on my 142 before I switched to the Bilsteins now that I think about it. When I tear the suspension apart this spring, I'll have a close look at everything. I had the Bilsteins installed rather than doing it myself due to time constraints which I don't have now.
 
I have bilstein tc on my 1986 volvo 240 and the rears are doing the same thing. Light clunking noises over small bumps. Very annoying!! I will tighten them up tomorrow to see if the noise goes goes away. They have 15,000 miles on them
 
My 740 HDs did the clunking as well. Passenger side, you could hear it if you had your head under the car while someone lightly stepped on the rear bumper. Weirdest damn thing. I took it to be slack in the upper mount (where the HD metal bushing sleeve might be a touch too short). Couldn't get the rubber donuts in on the HD stubs, but switching to Konis with the bushings made it go away.... :wtf:?
 
My 740 HDs did the clunking as well. Passenger side, you could hear it if you had your head under the car while someone lightly stepped on the rear bumper. Weirdest damn thing. I took it to be slack in the upper mount (where the HD metal bushing sleeve might be a touch too short). Couldn't get the rubber donuts in on the HD stubs, but switching to Konis with the bushings made it go away.... :wtf:?

Yeah, those ****ing donuts. If you go to the effort (with liberal cursing) of installing the Bilstein with donuts on the mount stubs, they then create some suspension stiction for who knows how many hundred miles. (just speaking of the 740/940 platform)
 
they seemed to ride/handle much better with 250lb 5" diameter springs. plus, they are adjustable (though it's a pain in the ass), so you can tune the rebound to your liking. I have them on full stiff, even now with stock springs. ride is fine.
 
Thanks for that. I'm going with them. After two sets of Bilsteins in the rear, I can't take it anymore. I'm going with the full IPD spring kit (or an alternative if there is a better one) to get the ride back on track. My springs after 235K miles are a wee bit tired.

If anyone has alternative suggestion for springs, I'd like to research them. I like the original springs as they were progressive and rode well when they were newer but I don't want to pay for the replacements when I can lower the car and get a better stance. I have custom-made spacers in the rear which will give the car the look and feel.
 
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