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  #1  
Old 03-22-2008, 12:34 PM
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Tstat fixed but WVO in second tank not getting hotter

So I have a greasecar kit on the 81. Aux tank in the trunk holding 13 gallons of WVO (filtered) with a copper coil heater filled with hot coolant to heat the oil.
Yesterday I replaced the tstat and before a good burp, the temp gauge would show hot. BUT the oil wouldn't get much hotter than it did before the new tstat.
I replaced the tstat because the car wouldn't hold a high ebough temp to both heat the oil AND the inside of the car so I would be cold in order to maintain the oil above 100*(no lectures, I KNOW the magic number is 160).

So I figured that replacing the tstat would make it all better. The car would get warm and the oil would get hot.
Not really happening.
Any ideas from those with GC kits?
Thanks!
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Old 03-22-2008, 12:48 PM
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In another thread I saw a reference to a 50/50 blend of coolant.
Blend of what? Water?
When I did my tstat yesterday I put in straight coolant.
Should I drain some and replace with water?
ThankS
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  #3  
Old 03-22-2008, 12:59 PM
Craig
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It should be approximately 50/50 mixture of coolant and water (I use distilled water). I would drain out half of what you put in and replace it with distilled water.
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Old 03-22-2008, 01:19 PM
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I'm not sure what type of system you have, but heating the veg in the tank ONLY will definitely not do the trick. I suggest getting a FPHE (from roverhybrids, best price) which, as long as your heating system is working properly, will get you closer to 140-160. Dont worry about veg flowing from the tank, it will flow at very low temperatures, down to 45 degrees or so. Be sure that the coolant goes to the FPHE straight off the engine block. You could also go for the vegtherm but then you run into alternator issues, plus they get real f***ing hot.
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Old 03-22-2008, 01:35 PM
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Quote:
Originally Posted by reyemtm View Post
I'm not sure what type of system you have, but heating the veg in the tank ONLY will definitely not do the trick. I suggest getting a FPHE (from roverhybrids, best price) which, as long as your heating system is working properly, will get you closer to 140-160. Dont worry about veg flowing from the tank, it will flow at very low temperatures, down to 45 degrees or so. Be sure that the coolant goes to the FPHE straight off the engine block. You could also go for the vegtherm but then you run into alternator issues, plus they get real f***ing hot.
I was thinking of putting a spin on filter heater in to augment the heat from the tank. In the summer I'll also add some veg to the main tank. We get mighty warm here in Denver in the summer and the past two summers we've been using a 50/50 to 80/20 (WVO to diesel) in my other MB (78 is sig) and it does well. So blending in the main tank in the summer would make the spin on fitler heater have somthing other than diesel to heat. I've heard heated diesel loses lubricity.

I'm not sure I want to go the FPHE route yet. I've gotten the oil up to 151* before with the old tstat in and a really nice day outside.

I'm really wondering why the new tstat won't help the oil heat higher.
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Old 03-22-2008, 03:56 PM
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where are you measuring the temp at?
Are the coolant hoeses getting hot where they go into the tank? Maybe not eneough flow of coolant to the tank, and hoses?
Should be getting warm if the engine is.
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Old 03-22-2008, 04:05 PM
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I would check that no hoses to the WVO tank are kinked. The PO installed a greasecar kit on my car and the hose isn't positioned well as it enters the trunk causing it to restrict the flow.

I'll second the FPHE, I bought one for under $100 and it only took about 1/2 hr to install.
ben
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Old 03-22-2008, 04:35 PM
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The spin on filter heaters don't do much. If you want the engine to last you need a FPHE or some electric heat. Tank heating alone is not enough.
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Old 03-22-2008, 05:29 PM
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Ok, If you are trying to heat 13 gal. of grease, and the inside, and a radiator,
Don't you think this is a bit much to ask of a 5 cyl. in Denver(ish)
at this time of year?


Between the temps. outside, the extra heat you need for 13 gal. of
grease (that is a bit much), and a cooling system that
was designed to keep everything in check without heating the extra grease,
Maybe you should consider a piece of cardboard up front.
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  #10  
Old 03-22-2008, 06:54 PM
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Quote:
Originally Posted by imagesinthewind View Post
In another thread I saw a reference to a 50/50 blend of coolant.
Blend of what? Water?
When I did my tstat yesterday I put in straight coolant.
Should I drain some and replace with water?
ThankS
i agree with craig... you need a 50/50 mis antifreeze (zerex or MB) and distilled water

the fact that you put straight antifreeze might have something to do with your erratic cooling (or not) that you have listed in another thread.
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  #11  
Old 03-22-2008, 09:14 PM
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Ginny;

How long are you running at 150-160F before switching to WVO? What is your ambient temp when you've been having problems? My 240D was running fine with the greasecar computer controlled unit for the past couple of days. The daytime temps were around 40F and it switched to WVO after running for about 5-6 minutes. Today it was 25F and it took around 10 minutes before the WVO was hot enough.

John
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  #12  
Old 03-22-2008, 10:27 PM
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straight coolant needs a LOT of heat to get up to temp, plus it will boil off below what a mixture will, so you could be dealing with steam in your system not getting enough heat into the mix.
find out the capacity of the coolant system, add about a quart for the extra lines, and cut the number in 1/2 then drain out that much coolant, and put that much distilled water in.
you will have much better responses from your car.
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  #13  
Old 03-22-2008, 10:32 PM
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Is the veggy stuff in series with the cabin heat or parallel? Are you sure your circulator is working?
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