SNAIL

Meeuw · Posted: Fri Sep 26, 2008 9:18 am Post subject:

@ Backfire

I will use a new designed crankcase using the outlines of the original. The crankcase will be either sandcasted or machined from a billet. Have to talk to an engineer for the right decision Rolling Eyes

I prefer machined

@ Olli
I'll put them up asap. Any idea to upload a larger amount of pictures?

Meeuw · Posted: Fri Sep 26, 2008 9:24 pm Post subject:

@ Olli

I've put the images in the topic

Have fun........... Laughing

backfire · Posted: Fri Sep 26, 2008 11:06 pm Post subject:

Wow, sounds good, hope that oil leads will work out fine for all that heat and power. Cool

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2CV, with Visa turbo charged

Meeuw · Posted: Sat Sep 27, 2008 11:38 pm Post subject:

@ Backfire,

The oilpump of a Ducati Monster is connected to the crankshaft and will be used in the same way.

In theory I can use splash lubrication for the driveshafts and the oilpump for the cilinderheads. The pump pumps oil to the oilcooler and the returning (cooled) oil is pumped along the crankbearings towards the cilinderheads. From there it drops down internally towards the crankcase.

Becouse the new designed crankcase is split in 2 halves it will be not that difficult to do the same as Ducati did. You just need a good CNC machine.

For the heat: Citroen has a marvellous solution to cool aircooled twins Wink

Anyway thanks! Your question got me thinking and made me decide to CNC the crankcase from billet!

backfire · Posted: Sun Sep 28, 2008 11:13 am Post subject:

I can´t wait to see the finished prototype Cool

It will be a 2cv desmo Wink

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2CV, with Visa turbo charged

Meeuw · Posted: Sun Sep 28, 2008 11:34 am Post subject:

@ Backfire,

How did you build your engine?

I'm interested in: Compression ratio, turbo pressure, turbo dimensions (amount of air), carburation, ignition etc.

backfire · Posted: Sun Sep 28, 2008 12:03 pm Post subject:

Engine is not finished yet, but compression is lowered to 1:7,2 approx. I made a shim to fit between crankcase and cylinder. Turbo is from a 3 cylinder 1000cc daihatsu, so that should work. I will start with simple system based on suck through (commonly used on 1970´s bike, like honda cb750 etc). I will start using orginial carb, but I already have a SU carb, for which you can buy 100´s of differtent needles for setting, plus SU as you know is much smoother then standard carb.
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2CV, with Visa turbo charged

Meeuw · Posted: Sun Sep 28, 2008 7:53 pm Post subject:

@ Backfire,

So in theory you could run 10 to 11 Psi safely with 98 octane fuel. With intercooler you'll have +/- 50Hp.

The SU will also work fine in a pressurized set-up. It is also easyier doing 'plumbing' Laughing

If you need info on the carb and other posibillities then try this book for a change:

ISBN 0-85059-744-7. It's written by Allan Allard (of the Allard cars) and is called Turbocharging & Supercharging. It's old but good.

The software you'll find on www.turbo-bike.com (or .net) and www.virtualengine2000.com is also helpfull. And you can download them for free!

Furthermore try SketchUp if you need a 3D setup of the engine and enginebay. It's good to engineer and visualize everything before you start. You can download it free at www.sketchup.google.com.

backfire · Posted: Sun Sep 28, 2008 8:22 pm Post subject:

great links, you dont happen to have a .dat file for a visa engine :)

PS I am going for 45HP (valculated at 7psi), I have 8 percent reduction on my gearbox and a little bit taller tyres, all in all overall 10 percent reduction compared to 2cv6.

That should give me a top speed of 140 but nicer is a smoother cruising speed at 110.
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2CV, with Visa turbo charged

Kironk · Posted: Sun Sep 28, 2008 11:41 pm Post subject:

I tested mine has 1,2B (17,4Psi), not very long, gearbox was noise! Laughing

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Home Made Buggy with V06/644 injection turbocharged

Meeuw · Posted: Mon Sep 29, 2008 11:47 am Post subject:

@ Backfire,

I'm sorry, I can't help you

@ Kironk,

That's a lot of Psi! What have you done to avoid detonation?

And yes, this will destroy your gearbox.... Have you seen the configuration page on www.cats-citroen.net? It's good for choosing the best type of gearbox.

Kironk · Posted: Tue Sep 30, 2008 4:31 pm Post subject:

With your project, you do not know solution to avoid explosion???
Rolling Eyes

It's strange Rolling Eyes

lower compression, intercooler, rich injection....

Everybody know cat's website Laughing

Now, i ride with lna gearbox.
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Home Made Buggy with V06/644 injection turbocharged

Lars E · Posted: Tue Sep 30, 2008 7:02 pm Post subject:

I run on 95 octane with 9-1 inn compression and 0,7bar f boost (ca. 10psi)
No problem with an intercooler mounted

Going too have 1,0bar later
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Mvh. Lars E
2cv 0,6Tii special

Meeuw · Posted: Tue Sep 30, 2008 8:58 pm Post subject:

@ Kironk,

Basicly I use a normal and complete Ducati engine with only a modified (new built) crankcase and crank. Compression should also be lowered a bit to avoid detonation when running a supercharger.

All the normal stuff from the Ducati will be reused.....

Meeuw · Posted: Tue Oct 14, 2008 9:22 pm Post subject:

Okay, here's an update.

Today I've bought the enige. It's a jammed Ducati Monster600 from 1994 and this one will be used for measurement.

For the techies:
Bore: 80mm
Stroke: 58mm
Cubics: 583cc
Valves: Desmodromic, 2 valves per cylinder
Compression: 10.6:1
Brake HP (@ the wheel): 51Hp
RPM: 8700
Carbs: Twin 38mm Mikuni (will be replaced by injection)

I already have the Aisin AMR300 supercharger which is in mint condition...

So I think it's gonna be a long winter for me Confused

Will post some pictures soon.......