I am wondering how much horsepower can be had with the M20 without turbo or supercharger. what do you think is the most power that you have heard of, or think can be had. With anything (split second injection, mega squirt, Individual throttle bodies 304 cam) anything.
Car has to still be reliable and a decent power curve. I am looking at having one of the most powerful M20 there is. :redspot

The most powerful m20 non turbo is around 240 HP. It uses the e36 m3 crank in the m20. You can get this whole engine already built by metric mechanic even though they do not list this on there website. They have it and will sell it, its a built up 2.5 late model 325i engine. If you do not want to buy the engine find a nice e36 crank and go to work.

I did not do this because I had the 2.8 liter already. Using the 524 td crank, which I knife edged. I am also lightening the 325i flywheel, porting and polishing the 90 325i head and going with plus one valves and a 274 cam, and mustang injectors. Should be about 200 hp or more in this configuration.

Now Schneller offers a supercharger for the late model m20, but personally we all know that you can get even more power by turboing the m20.
There are some guys in sweden who have 400 hp monsters in there e21s.

How mcuh would that engine be.

Could there be possible 225 whp with the setup you have or my setup I have the eta crank. Different injection maybe. Maybe different cam

Not sure, what you are talking about here. Are you asking me if I recommend using the eta crank in a 2.8 liter stroker engine?

Some people cryo the eta crank or just slap in into their 2.7/2.8 liter engine.
But, there is a very remote, outside chance that the eta crank that is cast rather than forged can break and there goes your engine!!

So my 2.8 liter which was built before I am removing the previous owner's eta crank and putting in a knife edged 524 td crank..

If you went with tripple side draft carbs and a more radical than 274 cam, then you get even more HP, but its diffucult to drive on the street and tune these.

If you could find a individual throttle body setup, like run on some VW 16 valvers in the after market and adapt it to the m20 then yes that 2.8 liter is going to fly!! You could then use the shrick 288 cam.

BMP used to carry an indivdual throttle body setup but someone else made it and its not avialable for the m20 anymore.

A well developed, naturally aspirated engine can make 100hp per liter. That takes a custom cam, custom high compression pistons, custom long rods, head work, programable EFI/ignition, custom header and a lot of work on a dyno and $$$ for parts that didn't work right the first time. It could easily take 3 different cams and several different headers before you got the correct combination-HP cost's money so don't expect big numbers unless you are willing to spend big $$$. On a budget you will never have the most powerful m20, that's just the way it is.

I could easily get 200hp from my 4 cyl if I had the $$$ for parts combination development. I don't have the $$ so I will be happy with a 2.0L that makes 150hp for a LOT less $$.

ken

Do you need to do anything to put the e36 crank into an eta block as far as modification goes?
And which crank do you use? s52? m52?

Holy old thread Batman.

Metric mechanic list the Rally 3100 on there website 10,000 dollars. 240hp.

I have spoke with Teddy at the shop played halo 2 online is how I spoke with him. His comment was at 8,000 revs 240 hp is easily handled by the ETA crank.

Do you need to do anything to put the e36 crank into an eta block as far as modification goes?
And which crank do you use? s52? m52?

You use the e36 M3 S50 crank, and S50 rods with custom pistons, and an 85 or 86 mm bore. If you use the S52 crank, than you need custom panter rods which cost about 1k and are not worth it IMO. You need the 325i block to fit the s50 crank rather than the eta block and then bore it out.

Holy old thread Batman.
Metric mechanic list the Rally 3100 on there website 10,000 dollars. 240hp.
I have spoke with Teddy at the shop played halo 2 online is how I spoke with him. His comment was at 8,000 revs 240 hp is easily handled by the ETA crank.

The eta crank is a cast crank, and it is 81 mm. You can build a 2.8, or a 2.9 liter with it,
and the approx HP is 200 or so. The 524td crank is forged and also 81 MM.
FOrged cranks are stronger than cast ones, and though they are not required for a street engine,
if it was my car and my time, quess which one I would use - the 524 td one.
I have also knife edged my 524td one, and that is overkill.

To get to the extreme outer limit of the m20 you need bigger displacement,
and hence the use of an s50 86mm or greater crank to build your engine.

At the point when you have to spend 10k on the engine, and then you need a better fuel system with different larger injectors than the standard on Motronic, Forced Induction, Tuboing starts to look very attractive. A t3/t4 turbo on a M20 2.5 or 2.8 will rock you at over 300 HP..and given the light weight nature of the e21, you car will be fast as anything.

a friend have a 323i 2.3 with the kjetronic (obviusly modificated but with the original mechanic inyection and 2.3l) camshaft by ballestrini modificated head ports, all.... hartge exahust manifloid... suplemental inyection, forged pistons.... etc.... 209cv

Hi my 2.7 makes 248 hp a lot of the race 2.7 motors (UK BMW Club championship) make 260 hp (these are fly wheel figures)

This with stand alone and ITB's and a 300ish cam

A 3.1 stroker will probably not give that more power becuase you are limited by the valve size, possibly 10-15 bhp but more tourqe which is what you want.

Jason

I am wondering how much horsepower can be had with the M20 without turbo or supercharger. what do you think is the most power that you have heard of, or think can be had. With anything (split second injection, mega squirt, Individual throttle bodies 304 cam) anything.
Car has to still be reliable and a decent power curve. I am looking at having one of the most powerful M20 there is. :redspot

things like the most horsepower that can be had and reliable should not come even close to being in the same conversation.:nono

Hi my 2.7 makes 248 hp a lot of the race 2.7 motors (UK BMW Club championship) make 260 hp (these are fly wheel figures)

This with stand alone and ITB's and a 300ish cam

A 3.1 stroker will probably not give that more power becuase you are limited by the valve size, possibly 10-15 bhp but more tourqe which is what you want.

Jason

Jason you run tripple side draft carbs.
That with your extreme duration cam, and stand alone accounts for a lot of HP gain.

According to Jeff who has built his own MM style stroker, there is not too much difference in performance between the 3.0 stroker using the s50 crank,
and the s52 crank which requires a lot more money due to the fact it needs
custom pistons and custom rods that cost over 1k for each set.

With larger cranks of the s50 = 86 mm, and the S52 which I thought was 91mm the torque is definately and advantage..and lots more power.

I am going with both plus 1 valves and billet rockers on my engine,
and for a 3.0/31 M20 stroker it should be a consideration.

Stand alone setups costs a lot, but they are awesome.
I have seen some that are fully adjustable down to the level of controlling the injector flow of each one, on the fly.

Just buy an s52. Throw in cams, a chip, and some long tube headers.

End of discussion.

lifted from owners post.

decent figures from a 3.1

http://i110.photobucket.com/albums/n120/diggerdigger/kWN_UNI.jpg

He has had the head ported and runs a bigger cam, but there are probably more gains to be had with more aggressive porting, a cam with much larger lift (only 11.75mm atm), and a set of throttles. Put out 140+kw on a different dyno for comparison, so they arent really a good indication of overall power, more how much increase you get over stock (which it put out like 98kw).

Jason you run tripple side draft carbs.
That with your extreme duration cam, and stand alone accounts for a lot of HP gain.


What do you mean? Sidedraught carburettors and stand alone engine management? :confused