M20 "I" head Vs "E" head

[SpecM]

^ yea, those piston specs you posted were for euro etas.

And yes, for the first few months of production, the s-etas have a 885 head with only 4 oil holes. I used to own one (12/87)

[liv2race]

Here are the pics of the head from today. In the pic is the new valve springs, P&P, and the holes driled.

The green is the assembly lube as we did have a cam in there that my friend sold about 6 months ago. The rope is what we used to help us pull the rockers/cam.

Clearly its a 885 casting.


The other question I have is there are some areas where the holes are not drilled. Im not sure if its supposed to be or not. anyone know off had or have a pic of a I head with the valve cover off so I can compare?


Thanks again for all the help guys! R3V rules!!!

[ForcedFirebird]

[liv2race]

Thanks so much! looks like I have two extra drill holes. Think that will affect anything?

[SpecM]

nah it will be fine. Unless the machine shop drilled the holes out already, the head is from a 2.5i

[liv2race]

Thats how it is now. The machine shop drilled out two too many holes it looks like.

this was a SETA head 2.7 and only had 4 holes. From what I gather in the pervious posts.

Thanks!

[whodwho]

Looks like single springs, are they stock or aftermarket ones?

[liv2race]

aftermarket.

[hotballs]

You may want to weld the water jacket since you're doing all this work.

[der affe]

Here are the pics of the head from today. In the pic is the new valve springs, P&P, and the holes driled.

The green is the assembly lube as we did have a cam in there that my friend sold about 6 months ago. The rope is what we used to help us pull the rockers/cam.

Clearly its a 885 casting.


The other question I have is there are some areas where the holes are not drilled. Im not sure if its supposed to be or not. anyone know off had or have a pic of a I head with the valve cover off so I can compare?


Thanks again for all the help guys! R3V rules!!!

you may want to finish the port and polish work. it looks like they only did the the port work where you bolt the intake and exhaust manifolds to the head and NOT behind the valves themselves. that's sort of like taking a big dump and not wiping. you didn't finish the job.
if you don't finish the port work you will either see little gain, no gain or less performance than if they had left it alone.

[DmcL]

if ti has the early 11:1 block would explain why it's so freakishly fast

lol sorry but if its still only going like that vid in ur sig its not that fast tbh.. unless US models are severely handicapped and that blows the doors of most similar spec or standard 2.5 US M20's.

im pulling harder on a low comp late M20B25 with a home made MAF conversion and a tune thats running too rich and needs more work (needs enough work still that my friends otherwise stock 325i sport sits dead even with me running the same WOT maps and diff ratio). i have a more agressive diff ratio than your 2.93 but still couldnt see it making that much of a difference tbh. id actually love to get my hands on a 2.93 or something in the low 3.XX's, sucks not being able to crack 60mph in 2nd gear.. even with a 7000rpm rev limit lol

getting down with the richness:

http://www.youtube.com/watch?v=tbL8avS7kg8

have a BBTB sitting next to me ready to go in, also some smaller injectors, have 19lb in there atm and they are too much. done alot of trimming back of fuel and AFM maps but still too rich, going to swap over to 4 pintle (0 280 150 415) E36 323i injectors when i get around to fitting the BBTB which should hopefully help kill off the problem with it running rich. no lambda sensor on our euro models doesnt help with that either lol

[ForcedFirebird]

lol sorry but if its still only going like that vid in ur sig its not that fast tbh.. unless US models are severely handicapped and that blows the doors of most similar spec or standard 2.5 US M20's.

im pulling harder on a low comp late M20B25 with a home made MAF conversion and a tune thats running too rich and needs more work (needs enough work still that my friends otherwise stock 325i sport sits dead even with me running the same WOT maps and diff ratio). i have a more agressive diff ratio than your 2.93 but still couldnt see it making that much of a difference tbh. id actually love to get my hands on a 2.93 or something in the low 3.XX's, sucks not being able to crack 60mph in 2nd gear.. even with a 7000rpm rev limit lol

getting down with the richness:

http://www.youtube.com/watch?v=tbL8avS7kg8

have a BBTB sitting next to me ready to go in, also some smaller injectors, have 19lb in there atm and they are too much. done alot of trimming back of fuel and AFM maps but still too rich, going to swap over to 4 pintle (0 280 150 415) E36 323i injectors when i get around to fitting the BBTB which should hopefully help kill off the problem with it running rich. no lambda sensor on our euro models doesnt help with that either lol

For an unmodified US 2.7, breathing through a stock eta exhaust (right down to the 25yr old muffler) and stock airbox, I think it's rather nice being able to walk b25's. By no means is it something to gawk at, and it's hard to judge by videos in the internet, but it sounds like you have work done to yours whereas mine is all bone-stock parts (including the tune).

If you look at the other video on my channel, you can see the same exact car, trans and differential, with the same driver on the same street that I swapped an m50 in, I am still not sold that the m20 is a weak engine (specially with an eta block)...

http://www.youtube.com/watch?v=lNNJ0Rx57qg

Yeah, I just touch the rev limiter at 70mph in 2nd gear, 3rd goes to about 120mph lol

We will see. I want to make a trip to my friend's dyno before I start modifying anything, but after will be a different story. I make headers for other vehicles, and have been slowly designing a tuned header system for the m20. I was going to just put one of my t04e's from my Firebird on it right away, but think it might be fun to play with it NA first.

Are you using the Volvo MAF conversion and TunerPRO for tuning? I tried that conversion on the GRM race car, and it never seemed to be right once into boost. As soon as it reached about 4psi, it pegs the WBo2 at dead rich (will only read to 10:1afr), but have yet to try it on a NA engine. We still have the setup, including several .bin files for various injector rates, might be interesting to test it on my car while it's still NA.

As far as not having the lambda sensor, I have been running my car without one since the swap, lol. I just haven't gotten around to welding in the bung (or being lazy and extending the wires), as I know that some tuned headers will be coming soon...

[DmcL]

yea volvo MAF/tunerpro, cant say for boost but ive got it runnign half decent NA.

only mods/stuff that may be different are a lumenition coil, MAF/tunerpro/ostrich, standard system (no cat) with scorpion backbox and an intake on the MAF, atm its just an open filter with a velicoty stack on the MAF.

noticed the M50 vids, they make higher numbers out of the box but i dont think they are lightyears ahead of an M20 performance wise.

i think the ETA exhaust is probably killing your top end, seems to pick up nicely at the start of the vid but once the revs get higher it doesnt seem to be pulling too hard. used 325i system maybe?

[DmcL]

yea volvo MAF/tunerpro, cant say for boost but ive got it running half decent as is. should seemore from it soon tho once i swap in these smaller injectors and re-tune.

only mods/stuff that may be different are a lumenition coil, MAF/tunerpro/ostrich, standard system (no cat) with scorpion backbox and an intake on the MAF, atm its just an open filter with a velicoty stack on the MAF.

noticed the M50 vids, they make higher numbers out of the box but i dont think they are lightyears ahead of an M20 performance wise.

i think the ETA exhaust is probably killing your top end, seems to pick up nicely at the start of the vid but once the revs get higher it doesnt seem to be pulling too hard. used 325i system maybe?

[ForcedFirebird]

Well, I just dyno'd the 2.7i.

Seems to be running really lean, got to get my wideband installed lol. but it seemed to hover in the high 14's! (stock Motronic 173 DME and injectors)

Made 134.16whp@5500 and 140.1wtq@4000 125+tq after 3000rpm

I will post the graph when I get a chance.