The comprehensive DOHC engine swap thread.

[JGood]

A nice little tip I just came up with this evening.

If you're removing the wiring harness from an engine you're about to put in, or removing it from your existing swap to do some work (like I am right now), get a container of white or brightly colored zip ties, some good wide ones.

Zip one around the boot of each connector, and write what each connector goes to on the excess strap sticking the buckle, then cut them to length. No more guessing where they go! Do the same for your fuel lines, firewall coolant lines, brake lines, etc.

I had a box of metal tags, it was just a small rectangular piece of very soft metal that you could wrap around stuff, and write on it with a pen. The ink wouldn't stay, but it embossed the metal, so it wouldn't wear off or anything during handling.

I can't find them anywhere, but if I do I'm buying at least 1000.



EDIT:

http://www.medicalproducts.com/body_bags_disaster_and_bio_hazard_write_on_metal_id_tag.asp

[Jand3rson]

Need a quick part number, and searching for it isn't getting me anywhere.

I need the part number for the M20 coolant hose that you use for running from the back of the 24V head to the heater core inlet on the firewall.

[xwill112x]

What setup for shift linkage do I need with a early E model trans? I have a early model D/S but it wasnt marked when seperated..How much does rebalancing cost? or can I just eye ball where the balance tac welds are and put it together?

[Jand3rson]

Probably not, you're going to want to have it rebalanced. Don't try guessing where it goes back together, because you're probably not going to get it right the first time.

[constantPROj3ct]

i have heard with a freer flowing exhaust, and filter cams alone will produce 240 hp for a m50, 2.5 bottom

can anyone else verify this information is correct?

[BimmerTim]

It definitely will not produce 240whp. Maybe crank.

[JGood]

That setup is known to make 190-200whp with a proper tune. Mine made 188whp.

[MaxBell]

Questions about where the charcoal canister hoses from the fuel tank go?

There's one hole on the top of the E30 canister and one hose that come up from the E30 fuel tank...just run that and block off the M50 throttle body one?

Or should I use my M50 canister and run the hose from the fuel tank AND the throttle body.

ALSO: I have no purge valve that I can see. Where would this be located usually? Does anyone have a photo of it that I can see?

Obviously for the other 2 fuel lines, supply goes to the front, return is at the rear?

[driftingminor913]

i just put the M20 single pin coolan temp sensor in my M50 head, is there a kit to wire it to the harness???? or do you have to Hard wire it into the connector on the firewall? i have been searching for this allday and no response

[kevdeno]

When I put the M20 temp sensor into my M50 head, I just plugged in the same connector into it. Then at the chassis to engine harness you just need to make sure the correct wires are connected. For me it was pin 4 on the E30 side and pin 12 on the E36 side, but check your sources on that to be sure.

[driftingminor913]

Even if it the single pin? It will still work with the e36connector?

[kevdeno]

I believe so. If I remember correctly the second wire on the E36 temp sensor is a dedicated ground. The E30 didn't have that. It grounded at the head. Keep in mind all you're doing is providing your E30 temp gauge a signal (in this case it's a resistance value). If the E30 sensor had only one wire, that's all you have to worry about.

[MaxBell]

Yep, the 1 pin E30 (brown top) temp sensor uses the same E36 plug.

QUESTION: I read that there is a wire (Pin 2) that has to be hooked up from the C103 plug in the glovebox to prevent a 3500 rpm cut out.

Where do I wire this to? I have a 3500 rpm cut out.

[amcink]

This thread is a great idea Ryan. It seems more and more people are becoming serious with the DOHC(M50/S50) engine swaps rather than just throwing a whim of a dream they had onto the forums. This is some very helpfull info that I saved a few months ago from Chuck Waits. Hope this can help.

E30 M50 ENGINE CONV PARTS LIST

"1. E30 88' radiator, I used the e36 unit with the lower mounts raised
2. E30 88' radiator over flow tank
3. E30 M20 fan, poss. w/clutch
4. E28 533i motor mounts w/ 5mm spacers or e28 m5 mounts with out spacers
5. E34 throttle cable
6. E21 brake booster w/ modified shaft, to 15mm or 325IX/e32 735 without mod to the shaft
7. E34 M5 or 25mm brake master cylinder w/ additional brake line used for the 325ix booster
or a e32 735i with the modified 320i booster
8. E30 325 trans X-member
9. E28 m5 or two 320i trans mounts/ which are cheaper
10. E30 M3 driveshaft or i used the front of the e36 mated to the rear of my e30 M3 have it rebalanced
11. E30 diff. w/ 3:25 ratio or E28 533i w/ 3:25 LSD
12. E30 318 ECU mount
13. E34 oil pan
14. E34 oil pickup
ect. ect.
15. E36 m3 exhaust manifold
16. M50 radiator hoses
17. E36 M3 Motronic
18. OBDI intake manifold
19. OBDI throttle body boot
20. E36 alloy mounting arms
21. OBDI wiring harness DO NOT BUY silver label ?413? motronic, it has EWS (security),
it can only put into original chassis
22. the engine harness and the ECU are all E36 M3.
On the standard E30 with M20 engine fitted, you have the large round plug (C101) up on the firewall next to the brake booster.
This plug has 2 parts. One half is connected to the car wiring, and the other is connected to the engine harness.
When the M20 was removed, the engine side of the plug was removed with the engine. Now I have the S50 half of the plug in its place. Although similar in appearance, it will not plug directly into the E30 half of the plug.
I removed the E36 engine half of the plug, and replaced it with an E30 one. This then allows the 2 parts to screw back together. All you need to make sure is that you have the correct wires connected to each other. Its not just pin 1 to pin 1 and pin 2 to pin 2 etc (although some of the wires do actually connect this way).
This plug connection is the only point where the E30 & E36 wiring interface with each other. The rest of the E36 M3 engine harness is totally self contained.

23. the exhaust from the downpipe to the muffler is all custom made

This is not a complete list but damn close if you need any additional info feel free to email or call me at
INTERNATIONAL AUTO
770-745-0501
my name is Chuck Waits, and we are open from 8 to 5pm EST"
________
Yamaha XV750

Is this list up to date? Since I just got a 1993 M50 (do not know it is a tu or nv) that will go into a 1985 and I want to gather the rest of the items.
Please, let me know

[rightcoastbias]

M42 318is radiator
+ 14" pusher fan
+ Dayco 71901 (This hose can be cut in the center and trimmed to provide both upper and lower radiator hoses)
+ 80deg tstat (I drilled a 1/8 inch hole at 12' o'clock)
M52B28 block + M50B25 Head + M50B25 413 Red label ECU
eBay knock off supersprint longtube headers
M52B28 Dual Mass Flywheel (the suck.)
M42 G240, stock Throw Out Bearing, stock slave cylinder
E36 M50 manual drive shaft + E30 CSB mounted backwards
E36 M50 manual shift linkage and bracket
Small Case S4.10
Slotted factory E30 brake booster 1/2" + modified brake pedal
One stupid grin.