LPG conversion of an R170 - Mercedes Benz SLK Forum

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#1 Old 02-27-2017
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LPG conversion of an R170

I'm starting this thread to let members know how I get on with converting my R170 type to run on liquid propane injection. (Lsi)
The kit is made by "Vialle" . Based on BHP/KW, the SLK 230 needs the largest injectors (brown) and the larger pump. I'm installing a cylinder style, multi- valved, single-hole LPG tank. It's 300mm. diameter and 863mm long and had a gross capacity of 55L. This means a useable LPG volume of 44L. I hadn't realised that the R170 model has a far smaller boot (that's trunk to you U.S. guys, LOL!), than the R171. To accommodate that tank and to still allow for roof retraction, I'm having the profile of the floor of the boot/trunk modified. It has to be lowered on the left (above the silencer) by about 50-75mm. It would appear that there will still be enough clearance for the silencer. We'll see .... The filler nozzle has to be located in the rear bumper. It can't go behind the petrol-flap because that doesn't conform to U.K. requirements. There'll be quite a bit of welding and head-scratching to fix the floor and the tank-frame in place! The spare-wheel will be lost but there will be a small storage area to the rear of the tank. I have sourced a strong luggage-rack that fits onto the boot-lid for those holiday occasions when luggage needs to carried. It's rather costly, though, at ~ Ł250!
I'll NEVER recover the cost of this conversion (unless I keep the car until I die and do about 80,000 miles, but do I care? I just love mechanical projects and technology! Lsi IS cutting edge!

David
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#2 Old 02-27-2017
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#3 Old 02-27-2017
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Originally Posted by Avel Du View Post

You never know, you might help others.
Well, I do hope that it wouldn't be a surprise if I DO help others? I certainly have no other intention in mind.

David
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#4 Old 02-27-2017
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In Australia you can get round LPG tanks (Doughnut Tank) that take the space of the spare tire, if you are going to loose the spare anyway it might be a better choice.
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#5 Old 02-28-2017
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The spare-wheel well is of a very small diameter (because it's a collapsible type) The maximum diameter is 50-55cm diameter. The height isn't that great, either. So you'd be carrying a quite low amount of useable LPG. You wouldn't get that far .... almost like running an all-electric car! No, I think that you need at least 40+ litres of LPG. Hence my efforts to install a decent tank. I have another car, so I envisage only using the SLK for pleasure and day-trips. So I won't really miss the boot/trunk space. As to no spare wheel, I cannot remember ever using one, and that is over DECADES of driving!

David
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#6 Old 03-16-2017
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Right, there's always a lot of concern regarding the fact that you're invariably not carrying a spare-wheel if you've converted to LPG? Well, how about this for an idea? There is still adequate space below my cylinder LPG tank for the spare-wheel to sit. (in its original location).The trouble is it can't be removed! So this is my solution :- It CAN be removed ... DOWNWARDS! I'll design a "half-moon" section for the base of the wheel-well. It'll be hinged so that it can drop down and the wheel can then be drawn out. I'll make sure that when raised, the hinged section makes a good seal and locates firmly in a matching frame. That frame would be welded onto the opened-up base of the wheel-well. Just one "minor" problem, though! Think of this ..... you've had a flat tyre and, O.K., you've got your space-saver spare ready to fit .... GREAT!. You remove the wheel that's got a flat tyre and fit the newly-inflated space-saver wheel. You're mobile again! BUT, just WHERE do you put the removed wheel !!!! It won't go back where the space-saver went! Now if you haven't got a passenger, then it could go on the passenger seat. But if you HAVE got a passenger?
Suggestions, please? LOL!

David
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#7 Old 03-16-2017
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David, without even doing the work that you are this has been an ongoing argument for years.
Passenger time being the real problem.


If the boot is empty then spiderclips might work in having the boot open but resting on the tyre.


The problem is the usual time a spare is needed the boot is not empty.


One suggestion was to hide the damaged one nearby, or leave with a local.
But then, how do you get it fixed?


I guess, loading the luggage around the passenger and fitting the wheel in the boot.
Using a tarp to cover the luggage and spiderclipping for an as secure as possible load.
The spare isn't designed for speed so it is a get me home or to the garage scenario.

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#8 Old 03-16-2017
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Quote:
Originally Posted by DAJ 190 View Post
Suggestions, please? LOL!
Two ratcheting straps and a towel. Place the towel on the boot lid. Place the flat tire on the towel so you don't scratch the paint. Use the ratcheting straps to tie the tire to the boot lid.
When you get the tire replaced or plugged, you put the spare back in its holder and the towel and straps in your boot.
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#9 Old 03-16-2017
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Yes, that would work .... the straps and towel would be there, ready, near the spare. I was surprised to see that there is still some space forward of the tank for two small cases! Knowing the way I go about thinks, I'll probably be designing those cases, too! LOL! I'll have to see if, with the roof raised, a wheel will go in the boot/trunk? I don't think so!

David
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#10 Old 03-17-2017
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I've looked at the boot/trunk and I think that a full-size wheel WILL store in there, with the roof up (I haven't got one around to actually try it) I've fitted the fuel-filler valve into the corner of the bumper and it looks VERY neat! I'm not disappointed at all that I can't use the adaptor method in the U.K. (i.e. allowing fitting of the propane fuel-filler source behind the petrol fuel-flap). It's going to be easier to fill, too, because there's not adaptor involved. I've thoroughly sound-deadened the wheel-well because with there being no spare wheel (yet), it could have been a source of noise. I'm aiming for the complete "rear" part of the project to be finished and then I'm going to be removing the intake manifold to fit the liquid-propane injectors. The lowered silencer (an AMG type) took some effort to be relocated correctly. I had to weld some modified steel hanger rods in place, but it's suspended beautifully now and "floats" on the original rubber mounts! There is no contact of the silencer with the underside or cross-members at all!
I think that the running costs are going to be better than half of those when using petrol ... Well, a fill-up is going to be only Ł20! (and should take me about 250 miles!)

David
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#11 Old 03-17-2017
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Originally Posted by DAJ 190 View Post
You wouldn't get that far .... almost like running an all-electric car!
Hello David, didn't see you lpg thread until now

I get more or less about 300kms with a full tank, in clk have a bigger one, that gives me about 400kms on lpg
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#12 Old 03-17-2017
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Right, there's always a lot of concern regarding the fact that you're invariably not carrying a spare-wheel

i don't have spare wheel on both, in clk have lot of space in boot: but don't want it .

instead, get a tyre repair on both cars, with a small air pump see pic
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#13 Old 03-17-2017
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Well Hello again, Roberto! What is more useful to me is your actual rate of consumption of LPG? I think that you use "litres per 100 kilometers", don't you? In the U.K. it's still "miles-per-gallon", even though the fuel is sold in litres! So if you can give me that type of figure, I can convert it. As I have mentioned, direct liquid injection of propane is claimed to be more efficient and it's claimed that it's almost the same as petrol! I think that you've said that you've got a 55 litre tank fitted, but I know that's not possible unless the floor is altered/lowered. You were going to post a photo?
Now, Roberto, hurry back to that OTHER interesting thread and reply to my latest post, please. LOL!

David
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Originally Posted by DAJ 190 View Post
Well Hello again, Roberto! What is more useful to me is your actual rate of consumption of LPG? I think that you use "litres per 100 kilometers", don't you? In the U.K. it's still "miles-per-gallon", even though the fuel is sold in litres! So if you can give me that type of figure, I can convert it. As I have mentioned, direct liquid injection of propane is claimed to be more efficient and it's claimed that it's almost the same as petrol! I think that you've said that you've got a 55 litre tank fitted, but I know that's not possible unless the floor is altered/lowered. You were going to post a photo?
Now, Roberto, hurry back to that OTHER interesting thread and reply to my latest post, please. LOL!

David
have to take a pic, in clk it's a round tank, in slk like a bottle

yes litres per kms...
and can't give that, because in lpg, i don't do math per liter, but for full tank, with other people, maybe they can get more kilometres per tank, but as i said in the other thread, i drive fast... so no mpg per gallon or kms per litres, simply don't care about it
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#15 Old 03-17-2017
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Originally Posted by Roberto_Rodrigues View Post
i don't have spare wheel on both, in clk have lot of space in boot: but don't want it .

instead, get a tyre repair on both cars, with a small air pump see pic
Well, I have NEVER seen that type of repair kit before? The ones that I have been aware of consist of an aerosol can that injects a type of foam into the tyre and, I think, inflates the tyre, too? Anyway, the tyre can't then be repaired at a tyre-fitters.
I like the look of that kit. Usually, it's obvious where the puncture is, because the nail/screw is sticking out of the tyre! But a "blow-out" .... that can't be repaired! What's the name of that kit that you've shown? Maybe it's available here, in the U.K.?

David
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Never? where you have living in last 20 years
are you kidding me?
well if you want i can send one or two repair kits with autolights and take me home kit
and get a small car (12v) electric air pump
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This is a small air pump that i have in boot (or trunk, for our Texas friend )
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#18 Old 03-17-2017
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There's a good pump that was supplied with the SLK from new. The Audi A2 has one, too. I'm surprised that you haven't got a Mercedes pump? Thanks for your offer and I'll be taking you up on that. May I have a "custom-blinker" kit, too? LOL!
I've worked it out that it might be easier if you just drive over here with everything and enjoy some really top hospitality!
A complete, free holiday here in truly wonderful North Wales! Am I joking? NO ! Do you want that Magazine?

David
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Now, Roberto, hurry back to that OTHER interesting thread and reply to my latest post, please. LOL!

Hummm... for designing a blinker for slk?
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#20 Old 03-17-2017
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Do you have a program called "Mastermind" on your TV in Portugal? Well if you were on it, I know what YOUR specialist subject would be? Well, SLK electronics, of course!

David
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