veggie heater

[John McC]

Hi all just need some advice (again ) going to make up a fuel heater out of some 2" copper pipe I have. The thing I need to know is what is the internal dimensions of the water hose and the fuel hose so I can use the right size pipe. I seem to remember that the water is ok with 15mm pipe and fuel is ok with 10mm is this right, and I know I could go look but it ain't broken yet so don't want to undo things until I need to .... Cheers John.....

[MattF]

Fuel line is 10mm on the 3L, 5/8" for the front matrix hose.

[ssray]

i built one of these and even in the surf they are v-big and have you checked out the price of end caps in 2" about £15ea and when you add the price of hose and anciliries it gets expensive,mine owes me about £45 so far. how about a flat plate heat exchanger you can get `em off the bay and these are much more compact and more efficent,i got one for £14 and used vinegar to clean it out.
Ray

[John McC]

Looks like I might be in for an expensive build with the fittings might look at other ways to do it. On the other hand could just buy this http://cgi.ebay.co.uk/Vegetable-Oil-...QQcmdZViewItem

[MattF]

One point to note is that copper apparently has a catalytic effect with
vegetable oil. As to whether it would be a rapid enough effect to affect
oil flowing through the exchanger is debatable, but there is a reaction.
Globulation, if I remember correctly. All other metals should be okay. If
you are going to build your own, Kunifer, (cupro-nickel), would be a
better option.

[John McC]

One point to note is that copper apparently has a catalytic effect with
vegetable oil. As to whether it would be a rapid enough effect to affect
oil flowing through the exchanger is debatable, but there is a reaction.
Globulation, if I remember correctly. All other metals should be okay. If
you are going to build your own, Kunifer, (cupro-nickel), would be a
better option.

Thats why I wanted to have a go my self as was going to use 10mm brake line which appears to be bronze alloy of some type, and just use copper elbows to get the bends.

[ssray]

most people use copper and dont have a problem,it only seems to be a prob with wvo `cos of acids