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Topics - mobile_bob

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61
Listeroid Engines / why did you buy a listeroid?
« on: April 09, 2006, 08:53:19 PM »
i have read many posts on this board, and just wondered what motivated you guys to go with a listeroid?

i for one used these criteria, (not in order of importance)

1. low speed=long life, or so it is hoped

2. cost of aquisition, although that may be a problem now with the EPA ruling

3. most importantly, the ability to fuel it with various fuels, ie. vegie, waste vegie, waste oil, and yes diesel

4. water cooled so as to incorporate the cogen scheme.

5. a hp rating that was small enough to work with, don't need a 3406 cat to do what i need :)

what is your reasoning? or criteria that brought you to a lister as opposed to whatever?

bob g


62
Listeroid Engines / increasing power, tuned intake and exhaust ?
« on: April 02, 2006, 03:24:05 AM »
i have read what i believe is most if not all of the posts on this board, and i have seen mention of trying to increase power
on these engine's

it is a given that the limiting factor is how much air you can get into the engine, as fuel seems not to be the problem in
that they all reportedly begin to blow black smoke as they reach their rated power.

several years ago i bought a pair of engineering books on engine theory and there is a section with the related math
to calculate the sizing of intake runner length and exhaust header length. These calc's were worked out on a single cylinder
gas engine in a lab at MIT.

a couple of things come to mind, and based on memory, which maybe lacking
also would like to preface the discussion with the following, fixed rpm engines are very easy to calculate the runner lengths required, which
can increase the amount of air and power upward of 20%.  The only thing i don't know as of yet is the cam angle or overlap used on these engines. modern diesels have extreme overlap and dont gain much with this scheme if i remember right. i am thinking that being an old design the overlap is likely quite narrow if at all.

1. the intake runner length on these engines is far too short and on the twins is horrible.  the intake length will likely be much longer than what is customary on these engine's. these short runner lengths don't do anything to ram air into the engine until over 5k rpm or more. which is never going to happen.

2. the exhaust runner length is also far too short, and should empty into an expansion chamber of sorts.

if there is interest in this topic, i will dig out the books and if i can get some cam degree info from the board, i wll run the calculations for a particular engine.

anyone interested?

bob g

63
Listeroid Engines / newbie to this board
« on: March 31, 2006, 03:33:45 AM »
Just found this board the other day after hearing about the EPA ruling on import diesel engine's, ie listeroid, changfa et. al.

been a diesel mechanic for 31 years now, and the lister's and changfa's give me major wood! ok maybe just alot of smiles.

i have a number of questions for you guys, so i will drop a couple here and there. i don't want to overload the system :)

1.  as far as pollution goes, does veg oil have the same problem as dino based fuel? more? less?

2. if the engines are purchased now or before april 1, 2006 do they have to comply with the new reg's?

3. how good is the 25/2 built by the indian company ashwema (sp)? does it need to be dismantled and reworked as i have heard many of the others have to be done?

4. is there a web site that deals with the 2 cylinder petters? or other resource as to the quirks one has with these engine's?

ok that is enough for now, anyway it is great finding this place, hope to add to the conversation as time goes along.

bob g

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