What does it take to wake up the m20b27 "e" motor?

[bigredguy]

for the 2.7i chip you said just 'i' cams? Is this true, or for a car with the entire 'i' head swap?

Also ive seen that changing to the 'i' valve springs and camshaft would increase power slightly without the entire head swap. This is also along with a new chip and a new 3.25 LSD. Any more info to back this up?

[shaferbm]

IMO of I'm going to go that far and be goofing with the head, might as well swap a better head in. That's my plan.

[pantelones]

Yes I have separate chips for a stock eta motor and the eta motor with 'i' cams.

I've sold a few in the last few years and people love them.

I'll post again here with more details in a few days.

MarkD

Yes, please post some info on this.

I was thinking of using...

- b25 Afm, intake, throttle body, injectors/fuel rail
- 731 cam, drill head for 7 journal cam, double valve-springs, mild porting/polishing
- ebay headers and 2.5" exhaust

Do you have, or can you make a chip to make that work?

[cheapshot]

Yes, please post some info on this.

I was thinking of using...

- b25 Afm, intake, throttle body, injectors/fuel rail
- 731 cam, drill head for 7 journal cam, double valve-springs, mild porting/polishing
- ebay headers and 2.5" exhaust

Do you have, or can you make a chip to make that work?

The 731 already has the 7 oil journals and Double valve springs really aren't needed unless you are going to rev past 6500 rpm but certainly wouldn't hurt anything. The 2.7i stops making power around 6k. I would also be careful if you are planning to do more than gasket matching on the porting. It is pretty easy to screw up a head with improper porting. If you are going to do that and have not done many heads before, I would find a local shop that is experienced in porting bmw heads. Everything you have listed above is what I am doing now with the exception of the exhaust.

[pantelones]

The 731 already has the 7 oil journals and Double valve springs really aren't needed unless you are going to rev past 6500 rpm but certainly wouldn't hurt anything. The 2.7i stops making power around 6k. I would also be careful if you are planning to do more than gasket matching on the porting. It is pretty easy to screw up a head with improper porting. If you are going to do that and have not done many heads before, I would find a local shop that is experienced in porting bmw heads. Everything you have listed above is what I am doing now with the exception of the exhaust.

LOL.....

No, I am using the 731 cam in the 200 head with mild porting to match the b25 (or maybe b23) intake. You need double valve springs to accompany the hotter cam so you don't get valve float. I don't plan on making any power over 5500 RPM, and if I wanted to I would use an 885 with seta pistons. And porting a head is porting a head. Aluminum works differently than cast iron, and you need to be conscious of that. I learned on cast iron heads from a small block because (I feel) it is more forgiving. I get the feeling you play me for a fool by your remarks.

[acolella76]

You would be better off using an 885 head in the first place, but hey more power to you.

[shaferbm]

You would be better off using an 885 head in the first place, but hey more power to you.

You mean less power to him! (at least after 5500 :p ) I now plan on using an 885 head, because it seems the 731 is hard to find.

What is the 200 head out of?

[pantelones]

You would be better off using an 885 head in the first place, but hey more power to you.

You kids are silly...

A head is a head, you can do what ever you want with it and make as much power as you please. You need to have the imagination, money, and skill to make it work. I don't want a top end screamer, I want to retain low end torque that the motor was designed to make. A hotter cam, and higher flowing intake and exhaust will let the head breath to is full potential. Granted it wont flow as much as an 885, but I don't care.

[shaferbm]

With an 885 don't you retain the most of the low end torque while gaining better top end? Thus why everyone swaps heads in these things.

[pantelones]

With an 885 don't you retain the most of the low end torque while gaining better top end? Thus why everyone swaps heads in these things.

Yes but, when you swap an 885 head on to the e motor there is a lot of other things that are associated with the swap. On the performance end, you do loose some low end, but you are gaining it on the top end. You essentially are moving your power band. I don't want to move my power band, and I can't justify spending the extra cash to swap an 885 head when I can be content with the current heads potential. Some people on the forums follow the monkey see monkey do principal, and don't take into consideration the other options out there.

[cheapshot]

LOL.....

No, I am using the 731 cam in the 200 head with mild porting to match the b25 (or maybe b23) intake. You need double valve springs to accompany the hotter cam so you don't get valve float. I don't plan on making any power over 5500 RPM, and if I wanted to I would use an 885 with seta pistons. And porting a head is porting a head. Aluminum works differently than cast iron, and you need to be conscious of that. I learned on cast iron heads from a small block because (I feel) it is more forgiving. I get the feeling you play me for a fool by your remarks.

You couldn't be more incorrect. I was not playing you for a fool. You never made mention of using the 200. I agree, a head is a head. You can do something with a 200 head but will take some skill. I don't see how you could make that casting flow any worse. Also, just as an fyi, from someone who grew up on sbc's, valve float will not occur at 5500. U won't run into that issue until higher rpm. This is not a pushrod motor with hydraulic lifters. The intention of my post was strictly informative, not condescending.

[cheapshot]

With an 885 don't you retain the most of the low end torque while gaining better top end? Thus why everyone swaps heads in these things.

Silly monkey.. JK JK JK! Yes, you are mostly correct.. Following proven methods of making power apparently turns you into a monkey. I have no problem with doing something different, thinking outside the box, etc. I get the idea of porting the 200 head, the idea of running a chip and higher ratio dif, etc. There are many ways to make an eta more fun. To each his own, as long as you are having fun!