M10B16 supercharging

[Yvan]

I have '87 316 with 1.6 (NOT 1.8 ) carb M10 engine (from new). I run it on LPG. Mostly slow traffic city driving, so it is OK. It's the same engine as it was in E21, just for tax reasons it was fitted for Yugoslavia and Greece:

http://www.bmwe21.net/specs.htm

http://www.bmwe21.net/engine4.jpg
http://www.bmwe21.net/diagram4.jpg

But sometimes I use it for 600 miles trips, and I would like some more power. I was reading a lot about turbos and superchargers. But I do not want M3 power, I just want to be able to overtake trucks going uphill without redlineing.

So I guess I need low rev power, I seem to drive mostly at 2000 - 2500 rpm. Can I just fit a supercharger (Rotrex C15-16 or C15-60 looks nice) and gear it for low rev power/torque? Without the intercooler, like here:

http://www.powerenterpriseusa.net/Power ... -news.html


In that case I need to megasquirt it (I already have megajolt - for ignition), new pulley, bracket for SC, and probably few other small bits... Right?

Please do not suggest engine swap, as where I am it is not easy/cheap to find engines, and taxes are VERY high for bigger engines (for example for my Audi 100 2.3 I need 3x what I pay for this BMW).

So, to summarize, can I fit SC without the intercooler and get what I want - low end power / torque?



P.S. What happenes to brake servo? It needs vacuum not pressure.

[e301988325i]

P.S. What happenes to brake servo? It needs vacuum not pressure.

Would not be affected as vacuum would still present between throttle and head. Might have to Jubilee clip the vacuum hoses as the pressure could make them pop off.

[Gunni]

Since it´s a carb it´s not going to be easy to supercharge it.

You might want to think about replacing the 1.6 with a 1.8 long block, that way nobody can tell you have replaced it.
It should be cheap and easy and run on the carb you have.

about the vacuum to brake booster, there is a one way valve that goes to it so there would never be no vacuum.

You have the least suitable E30 for any performance modifications because it´s got a carb to begin with.

[GrindCulture]

Can I ask, why don't you want to use an intercooler?

[baptie0]

you could modify the carb to take some boost, i have a old book written by Alan allard on turbo/supercharging.

or you could use a carb of a renault 5 turbo or a SU would be suitable for boost.

[Yvan]

- What is 1.8 long block, and why do I need one?

- Why is carb version better for supercharging? I planed to replace carb with MegaSquirt fuel injection. BTW i have Pierburg single barrel 1B2, not (as the rest of the Europe) double barrel 2B4:



From Rotrex supercharger installation instructions: "The most energy efficient solution is to have the throttle body positioned upstream of the supercharger. This will minimize the pump work by the supercharger, thus minimizing fuel consumption under part load because of the thin air situation around the impeller at throttle angles less than 90deg. Also a re-circulation valve can be avoided in this type of set up."

It's here:

http://www.rotrex.com/pdfs/Rotrex_C-typ ... s-V1.4.pdf

Do you still get vacuum in the intake manifold this way (for brake servo)?

Can I ask, why don't you want to use an intercooler?

I recently fitted a/c system, and now I have electric additional two speed fan and condenser in front of the radiator (that I would like to keep), and I do not want to cut out part of the bumper (as I've seen someone here did) so that all can be properly cooled.

[Yvan]

you could modify the carb to take some boost, i have a old book written by Alan allard on turbo/supercharging.

or you could use a carb of a renault 5 turbo or a SU would be suitable for boost.

I just ordered the book you mentioned.

As I wrote engines here where I am are hard to find, expensive, in bad condition (and good number of these are from stolen cars). This is also truth for engine parts. I can only imagine expression on the sellers face if I asked for a Renault 5 turbo carburetor

[baptie0]

you could modify the carb to take some boost, i have a old book written by Alan allard on turbo/supercharging.

or you could use a carb of a renault 5 turbo or a SU would be suitable for boost.

I just ordered the book you mentioned.

As I wrote engines here where I am are hard to find, expensive, in bad condition (and good number of these are from stolen cars). This is also truth for engine parts. I can only imagine expression on the sellers face if I asked for a Renault 5 turbo carburettor

sorry, i did not read the thread properly, i thought you wanted to supercharge your engine using just megajolt and a carburettor.

[Yvan]

sorry, i did not read the thread properly, i thought you wanted to supercharge your engine using just megajolt and a carburettor.

But that book that I ordered that you mentioned by Allan is good, right?

And back to my original question, can I supercharge my 1.6 M10 engine, and get low revs power / torque?

[GrindCulture]

Can I ask, why don't you want to use an intercooler?

I recently fitted a/c system, and now I have electric additional two speed fan and condenser in front of the radiator (that I would like to keep), and I do not want to cut out part of the bumper (as I've seen someone here did) so that all can be properly cooled.

Hoshy has a small intercooler behind the headlights on his supercharged iS. A small water-to-air cooler located smilarly would provide sufficient cooling I'd think. Charge cooling is really a good idea, especially if you want to get the most out of forced induction and increase the longevity of the build.

In reply to your original question, yes supercharging your car is possible and with the correct tune will perform exactly how you require it to. Although you'll need an M42 trigger wheel for the M10 to run megasquirt as well as some other bits and pieces that I'm unsure about.

[rix313]

Where does the condensor fit and where is your fan? I'm fitting a cooler to mine which sits just behind the grille and if the condensor sits where I think it does, you wont have any trouble, you'll need to remove two small brackets.

You should consider cooler got the reasons stated above, you don't want to spend all that time and money on a conversion to go ramming your engine full of horrible hot air.

[Yvan]

OK, we're back, this was quite long server update

Condenser and fan are original ones, on it's original location, in front of the radiator. It's cold now so I can't go and check, how big cooler can be fitted there?