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Vehicles / Re: Mercedes W202 saddle tank sump solution?
« Last post by dgs on May 25, 2025, 07:18:31 PM »Hi Phil and welcome, sorry to say its a bit quiet on here at the moment, hopefully someone who can advise you will see your post.
Recent Posts
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Vehicles / Mercedes W202 saddle tank sump solution?
« Last post by DWRDeep on May 23, 2025, 09:49:02 PM »Hello all, I haven't found where to introduce myself here & I hope this is the right place to ask this question.
I have used waste veg oil in my cars for many years, filtered at various times via socks or water filters down to 1 micron.
Currently I'm running a lovely 98 Merc C250 TD Sport, & have been advised never to let it go below ½ tank full. It runs beautifully. I know from whispers that people known as Spock & Chissel(sp?) successfully connected the tank halves with a sump modification, but I haven't found details.
I'm thinking of drilling a hole near the base of the upright tube in each sender unit, inserting tubes to hold the drain valves open, and connecting with a T so that both run to the main fuel feed.
Comments please?
Cheers, Phil
I have used waste veg oil in my cars for many years, filtered at various times via socks or water filters down to 1 micron.
Currently I'm running a lovely 98 Merc C250 TD Sport, & have been advised never to let it go below ½ tank full. It runs beautifully. I know from whispers that people known as Spock & Chissel(sp?) successfully connected the tank halves with a sump modification, but I haven't found details.
I'm thinking of drilling a hole near the base of the upright tube in each sender unit, inserting tubes to hold the drain valves open, and connecting with a T so that both run to the main fuel feed.
Comments please?
Cheers, Phil
13
Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by neisel on May 17, 2025, 09:52:37 AM »This may sound weird to you actual chemists but what I do is, using the no-tit calculator I tell it I have only 125L of WVO when I actually have 145ish. Methanol @ 16% gives me figures of 16L of meth & 625grms of Sodium or 875grms of Potassium (half those amounts if I' using half NA & half K.)
I suck it in, do the 4 bursts of mixing & fine tune it in S2 after I've seen the dropout.
I suck it in, do the 4 bursts of mixing & fine tune it in S2 after I've seen the dropout.
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Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by neisel on May 17, 2025, 08:19:09 AM »dgs,
Thanks for coming back to me.
Measured about 2 hours after I turned the machine off at the end of S1, dropout was 10%. S1 was four 8-10 minute bursts of mixing with a 20 minute 'rest' between each burst. My WVO is lightly used & v. clean - no water, no whites, no food. It is taken from the fryer after cooling overnight from operating temperature & is, I think, dry. When dropout after S2 is not zero it is only maybe 1 or 2%, too little to worry about IME.
I've been doing it like this for for several years now & typically use 20-21L of v. meth to make 145L of BD.
TBH I don't know what an FFA is.
Thanks for coming back to me.
Measured about 2 hours after I turned the machine off at the end of S1, dropout was 10%. S1 was four 8-10 minute bursts of mixing with a 20 minute 'rest' between each burst. My WVO is lightly used & v. clean - no water, no whites, no food. It is taken from the fryer after cooling overnight from operating temperature & is, I think, dry. When dropout after S2 is not zero it is only maybe 1 or 2%, too little to worry about IME.
I've been doing it like this for for several years now & typically use 20-21L of v. meth to make 145L of BD.
TBH I don't know what an FFA is.
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Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by dgs on May 16, 2025, 06:59:01 PM »Hi neisel, sorry, have been busy with various things.
Your total catalyst addition equated to KOH is 7.9gms/litre which is slightly less than base. in other words after your glyc wash there would appear to be no ffa's left in your oil which is unusual.
Average oil that titrates at say 5.0 titrates at about half that when glyc washed.
You only used 11% methanol for S1. Normally 14% is min to get reasonable conversion.
you didn't give us the dropout after S1. Did you leave at least overnight. Did you check dropout after S2.
Are you sure about all your values. I would be lucky to achieve those figures with new oil that I sometimes use.
Just more puzzled than anything .
Your total catalyst addition equated to KOH is 7.9gms/litre which is slightly less than base. in other words after your glyc wash there would appear to be no ffa's left in your oil which is unusual.
Average oil that titrates at say 5.0 titrates at about half that when glyc washed.
You only used 11% methanol for S1. Normally 14% is min to get reasonable conversion.
you didn't give us the dropout after S1. Did you leave at least overnight. Did you check dropout after S2.
Are you sure about all your values. I would be lucky to achieve those figures with new oil that I sometimes use.
Just more puzzled than anything .
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Chatter / Re: BBB 2025
« Last post by dgs on May 16, 2025, 06:25:51 PM »I'll be there. will bring the usual vin fuel and kerro.
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Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by neisel on May 15, 2025, 12:39:21 PM »Bump!
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Chatter / Re: BBB 2025
« Last post by Head Womble on May 13, 2025, 07:29:44 PM »That's a good reason to change the date.
Sadly I'm booked into an archery competition that weekend
I normally let Carl know via Whatsap, but my phone died and I lost all my old contacts, so if anyone else has his number please let him know.
Sadly I'm booked into an archery competition that weekend
I normally let Carl know via Whatsap, but my phone died and I lost all my old contacts, so if anyone else has his number please let him know.
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Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by neisel on May 13, 2025, 08:07:25 AM »Yes, it was glyc washed.
What do you find odd about the S1 chem percentages?
What do you find odd about the S1 chem percentages?
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Chemistry and process / Re: Chemists! Is using 50% KOH & 50% NaOH in 2 Stage Process stage 1 OK?
« Last post by dgs on May 12, 2025, 10:28:44 AM » Well done. although I'm a bit puzzled about the % of chems you used noteably methanol in S1.
Presumably your oil was glyc washed.
Presumably your oil was glyc washed.