323 top to a 325e bottom

[unkown]

323i+325e

what no comments on this? i thought some one here would have an idea.

[morerevsm3]

I have 731 head and cam on a 2.7 bottom end, and motronic 1.3, went pretty well, but had to change it out for an M20B25 to fit racing class regs, so 2.7 is sitting in the back of the garage now

[lennon]

i've had the same setup before. what are your specific questions OP?

[unkown]

so were is anyone with some help/answers?

[morerevsm3]

I would run all the 323i electrics, and replace the cam with one from a 320i/325i, you should be able to adjust the air flow meter to get it running well, even with 323i injectors

[unkown]

so...nobody knows /or has an onion about my little problem...i thought this was a tech forum?

[unkown]

oh... sorry about my last comment. thank you for the advice. the cam from the 323 was shot. i put the e cam in the 731 block, and used the 323 manifold..now theres hesition when i step on the gas, my master cylinder is out, im waiting for a new one to get here. Chilton says this can cause hesitation.
im thinking this is the problem...or maybe that with the e cam and the i manifold its getting to much oxygen. the rest of the 323 is gone. the electronics were toast too, it was a non bmw computer (plastic box with a Santa Cruz company address on it,definitely from the 80s)that had be ****** rigged to use a o2 sensor also. its gone to the scrap yard. should i use the e cpu without the up graded chip in it?

[unkown]

so that we are on the same page. its a 86 325es. with a 323i top end (731 & manifold) it has the e injectors and afm, it wont turn over with the 323s afm hooked up too it. its not the seals i just replaced every seal in the top end,when i had them apart.
victor rienz seals,Bavarian autos 8mm plug wires,torx head bolts,new cap,rotor,coil,spark plugs,chip for the e model,thermostat,refurbished fuel injectors,idle control value, cold start f.i.,new radiator hoses and vacuum lines,water pump,timing belt,air conditioning belt,and power steering belt. the only things that didn't get replaced were the sensors. the master cylinder went out right before i started this project. the head was not warped.

[E30 Wagen]

I hate to say it but i wonder if running an e cam wasn't such a good idea. It may have messed with your oil pressure? I just know that there are differences between the e cam and the 323i and 325i cam due to different head designs with bearings and oil journals and what not. But don't quote me, my memory could be off.

i think that the best way to do it is to swap pretty much everything useful from a 325i: cam, valve springs, engine management, manifolds, exhaust, etc... I think there are a couple descrepinces with a 325i harness being used on an eta block.

i'm hoping to do this myself except my 731 head needs some tricky and likely expensive machining. :(

I'm curious to hear more about your troubleshooting efforts. I really can't think of what else you could do. You could play around with different manifolds but i doubt that will make much difference. I think the computer can adjust to things like that.

[eta]

The e cam has a very short duration. The 323i has the longest duration of all the M20 cams BMW produced (only 3 of them). The e cam is one of the reasons why eta is efficient.

Also you should use the 325i inlet manifold. It flows more air than the 323i one. The inlet ports on the 731 head will need a little work with a grinder but not alot to make them match the 325i inlet manifold. If you fit a 325i cam, 325i inlet, 325i TB and motronic 1.3 with a chip you should get at least 170 hp.

[unkown]

the 731 head has the e's cam,pistons/rockers and the 323i manifold