2.8L M20 9.8:1 stroker build: my 323i reincarnated

[betz]

Have taken the car out a few times and the motor is happily ticking away with absolutely no oil leaks from what I can tell. I actually don't think anything is leaking at the moment. Radiator fluid was leaking a bit until I tightened a few hoses. Power steering all good.

The bad news is I got the hood on, and the car is going to need a little body work to get everything totally straight. Nothing super major, I already knew the car needed some work, I got it for $200 after all, but it's a little disheartening seeing the gaps to the fenders. This was the first time I put on the hood fully.

So, the short list is:
Engine break in
Injectors
Front bumper
Stainless steel zip ties instead of regular zip ties for the exhaust (they're not directly touching the pipes at least)
Smog
Take it to a body shop
Take it to an exhaust shop

[digger]

E36 m3 pump run at 5b 24lb/hr sounds like other issues in that case

You dont need more fuel pressure you tune the pulse width at rpm and loads it requires more or less fuel. Adding fuel pressure increase fuel flow at all times. Stick to a mild Increase in injector for that

[Kedge]

So you have an adjustable fuel pressure regulator? I think mine is a 3.0 bar late model FPR, Bosch 0280160249. I'm thinking that'll do fine for now but I know the M50's were originally something like 3.5 bar.

Nah, I fitted a Bosch FPR from Porsche 944 (S2 I think), runs at 3.8 bar. Problem I then had was that fuel pumps couldn’t flow enough against that pressure, even a brand new Bosch OEM unit and an E36 M3 unit was right on the limit so I fitted an AEM fuel pump. If I was doing it again, I’d just fit injectors rated at +200cc at 3bar.


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[betz]

Good to hear that you’ve got it running. The oil incident shouldn’t cause any issue for you, just a nice clean up sesh 🤣.

Shit hit the fan. So much oil. Took like 2 bottles of simple green and 2 and a half paper towel rolls. Sorry environment.

Try and get some good injectors in there ASAP, my M20B28 was pinking on the M20 injectors, even did it on the M50 injectors until I increased the fuel pressure.

Just bought some from CA tuned. Unfortunately MEPEH is out of commission.

So you have an adjustable fuel pressure regulator? I think mine is a 3.0 bar late model FPR, Bosch 0280160249. I'm thinking that'll do fine for now but I know the M50's were originally something like 3.5 bar.

[Kedge]

Good to hear that you’ve got it running. The oil incident shouldn’t cause any issue for you, just a nice clean up sesh 🤣.

Try and get some good injectors in there ASAP, my M20B28 was pinking on the M20 injectors, even did it on the M50 injectors until I increased the fuel pressure.


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[betz]

woooo! what injectors did you swap in?

Lol. I had a set of stock M20 325i injectors sitting around... So... Those. Will probably try putting in some nice rebuilt M50 injectors fairly soon.

I kinda don't want to admit it but whatever. I changed the oil filter after running it for like 20 or so mins at around 2500 RPM. For the flakes and whatnot from breaking it in. Decided I wanted to try taking it for a drive. Friend was standing watching. Oil starts spewing out. Turn it off immediately. The gasket from the old filter was stuck on there, essentially I doubled up on the damn gaskets and that's what caused the catastrophic leak.

The oil had spurted towards the fan and the fan launched it up all the way on the roof.

Pretty certain everything is all good, ran for maybe 5 seconds on partial oil. Pretty hilarious though 😁

[2mAn]

did it really just start?!?

:rofl:

[wworm]

Did it really just start??!!

woooo! what injectors did you swap in?

[betz]

Did it really just start??!!

[betz]

Replaced the injectors and it started! Still not perfect, motor shakes a bit at idle. Will try and upload a short video later

[2mAn]

What wiring are you using? Early model eta has 2 pumps and late have one. Might not be getting an fuel

[betz]

When I removed the plugs they seemed dry. I've also taken out a plug, grounded it and cranked the engine and it was for sure sparking.

[digger]

plugs get wet?

[betz]

injectors firing? for sure put a pressure gauge on it

How do I tell if the injectors are firing?

[digger]

injectors firing? for sure put a pressure gauge on it