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Old 04-18-2013, 06:17 PM   #1
oldbmw OP
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Frame mounted skid plate for bmw r100 gs?

Does anyone build a frame mounted bash plate for a bmw r100gs?
I have the oil pan mounted set up.
Thanks for any ideas.
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Old 04-18-2013, 06:22 PM   #2
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Originally Posted by oldbmw View Post
Does anyone build a frame mounted bash plate for a bmw r100gs?
I have the oil pan mounted set up.
Thanks for any ideas.
Talk to Prutser about this. He has made one for his R80ST. There isn't one on the market, so you'd be a pioneer.
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Old 04-18-2013, 06:32 PM   #3
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Skid plate

Okay. Thanks for the lead.....
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Old 04-19-2013, 12:23 PM   #4
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No reply.......

No reply from Pruster but I do have an idea. If you weld angle iron tabs on bottom of frame rails, you can remount your existing skid plate. A friend and I built a skid plate for a 1971 XS 650 I rode in the Barstow to Vegas Dual Sport event this past Thanksgiving. It took a beating but save my cases on a bike that had 3 inches of suspension travel. I think I will go this route. Then, the impact of rocks and boulders etc. don't transfer to the oil pan.
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Old 04-19-2013, 03:46 PM   #5
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A frame-mounted bashplate would be difficult with GS headers since they run almost under the frame tubes but with any other header it should be doable.

It's still a 3" drop from the frame to the sump. Even if you get it rigged you'll have trouble making it strong enough not to move without making it weigh a lot. I looked into to this once. I could've gotten a plate hanging off the frame but I'm pretty sure it'd get mashed into the sump in a hard impact. Let us know if you figure out a solution.

I've got big chunks of rubber matting behind my sump-mounted bashplate to soften the blow. It might be a more realistic solution for you. People have been bashing these bikes over all sortsa things for a long while with sump-mounted plates. I wanted to mount a plate to the frame too but the sumps seem pretty stout.
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Old 04-19-2013, 06:14 PM   #6
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I have an idea. Transmitting the force of an impact to the frame is not necessarily the goal here, it's simply to reduce impact onto the oil pan. Even with the bash plate mounted an inch away from the pan, that may make it even more susceptible to impact damage when the aluminum bash plate, with no cross grain support like it had with the oil pan, will be more likely to crack instead of bend and force jagged edges into the pan. I don't think we would need to connect to the frame to deflect damage better. Perhaps if one were to cut out the proper size of plate, rough up the inside surface of the new plate and the pan's existing bash plate with 50 grit, position the new plate about a 1/2 - 1" away from the pan, then fill the space with soft polyurethane. You could drill holes and insert a tube/pipe to make cutouts for pan bolt access. Impact absorption would be excellent I'd imagine, much better than a plate with nothing but air behind it. What do you think?
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Old 04-19-2013, 06:41 PM   #7
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then fill the space with soft polyurethane.
That is an excellent way of reducing the oil cooling on yer bike.
------------------------------

The earlier R80G/S bash plate was formed into a corrugated shape with some cooling/water shedding slots in it. And it bolted directly to the sump.

You could mount an extensive bash plate to the font of the frame and to the bottom of the foot peg mounts. Use some rubber bump stops between the new bash plate and the sump to aid strength and stop ringing. Something at least 3mm thick?

The idea is to spread the impact over a large area - so you don't get a sharp puncture through the sump?
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Old 04-19-2013, 11:29 PM   #8
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Originally Posted by oldbmw View Post
No reply from Pruster but I do have an idea. If you weld angle iron tabs on bottom of frame rails, you can remount your existing skid plate. A friend and I built a skid plate for a 1971 XS 650 I rode in the Barstow to Vegas Dual Sport event this past Thanksgiving. It took a beating but save my cases on a bike that had 3 inches of suspension travel. I think I will go this route. Then, the impact of rocks and boulders etc. don't transfer to the oil pan.

Sorry about that. I didn't check the mailbox for a few days.
I made some plates and mounted them between the frame and the engine.
They are mounted on the 2 12mm engine studs. I use the plates to mounth the skid plate to.







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Old 04-20-2013, 03:21 PM   #9
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That's the coolest bashplate I've ever seen ever.

Any chance you've got pics of the plates where they come out beneath the exhaust? I'll warn you, if I see those pictures I'm stealing this idea


Quote:
then fill the space with soft polyurethane.

Quote:
That is an excellent way of reducing the oil cooling on yer bike.
The later bikes dropped those cooling fins anyways. To be fair they added an oil cooler but I know a lot of people that ditched the oil cooler on their r100 many miles ago with no issues.
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Old 04-23-2013, 02:02 PM   #10
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Originally Posted by bgoodsoil View Post
Any chance you've got pics of the plates where they come out beneath the exhaust? I'll warn you, if I see those pictures I'm stealing this idea

The later bikes dropped those cooling fins anyways. To be fair they added an oil cooler but I know a lot of people that ditched the oil cooler on their r100 many miles ago with no issues.
Sorry I don't have more pictures of the plates. I welded some plates under the plates that are clamped between the engine and the frame. Than bolted the bash plate onto those plates.
The bash plate is 4 mm free from the sump. And it still is after landing the bike on the bash plate trying to jump 70cm thick tree trunks. So far I have no problems with overheating.
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