Mi16 - XU9J4 - engine rebuild to go into a 309

[hoodygoodwood 70 3 Cars]

I will be building an Mi16 to largely standard spec ( at least to begin with ) to go into my 309 , i would like to know of any recommendations of parts or mods i should incorporate on the way . On the 3 heads i have the cam pulley numbers are Inlet no 4 , Exhaust no 2 - on two of the heads and Inlet no 2 , exhaust no 2 on the other . With one of the engines i managed to get a fairly complete engine bay loom with ECU and AFM ,  i am hoping to get the engine going with this set up temporarily to run the engine in and put a few miles on it and take it to get a stainless exhaust made to suit . I will then fit a GTI6 inlet manifold and TB , remove the original loom and trailer the 309 to have a new aftermarket ECU ( Omex ) , loom and coilpack ignition fitted and mapped .

1. Are NGK BCP7ET  still the best spark plug to use on a road engine .

2. What combination of cam pulleys would be best - In no4 , Ex no2 ?

3. I have a re angled std exhaust manifold ( cut and welded ) I was going to buy a Milltek stainless downpipe ( 205 gti part number MSPE21 ) and have a new system grafted onto that .

4. I have plenty of ultrasonically cleaned std 1.9 yellow Bosch injectors , is there a modern replacement that would give a measurable improvement and fit the std rail without spacers or mods ?

5. If i could get it running well enough on the original loom/ECU/AFM i would consider leaving it in place permanently , i am going to have to buy a new dizzy cap , coil and plug leads for this arrangement anyway .

6. Is there a measurement for the amount of slack on the oil pump chain or would it be wise to replace it as a matter of course . 

Any advice on any of these points would be gratefully received . I am sure i will have more questions .

[Tom Fenton 1,540]

Leave it on the standard management, they run and idle really well and just behave as an OEM engine should. They are many many times better than the 8v Jetronic setup.

 

[welshpug 1,654]

PeterT  details the cams and pulleys here  http://www.taylor-eng.com/

 

 

If its standard, then a standard management will suffice, though as its apart, why not stick a fresh set of higher compression pistons and a cam upgrade, then you can make the most of an ecu change,

 

 

on standard management just get a set of standard injectors cleaned, if you change the ecu then there are loads of modern injectors available that are a direct fit, quite a few have used Green bosch injectors  (IIRC for an astra VXR)   from autodoc at around £45 a piece,  only use a reputable supplier as there's a lot of eastern made cheap replicas out there.

 

 

I dont think you need to spend £150 on a milltek downpipe, as you'll need to cut and weld it anyway, why not start with a direct fit 4 branch manifold, or get a local fabricator to make you a downpipe.

[petert 584]

You need original ecu + my chip. It will support up to 180hp.

[hoodygoodwood 70 3 Cars]

I have found a few  set of Mi16 spark plug leads for sale , are the Janmoor CPU 17 leads any good , they come in at about £22 , Magnetti Morelli are available but are a lot more expensive at over £40 .

[petert 584]

If you changed to R8 Audi COP’s, you wouldn’t have to worry.

[welshpug 1,654]

Never heard of the first brand, Autodoc have the marelli ones at £27.

[X-mo 19 2 Cars]

On 11/1/2024 at 3:38 AM, hoodygoodwood said:

4. I have plenty of ultrasonically cleaned std 1.9 yellow Bosch injectors , is there a modern replacement that would give a measurable improvement and fit the std rail without spacers or mods ?

Used a set of the modern equivalent to the stock injectors...same specs but modern spray pattern. Made a HUGE difference in terms of smooth running.

Engine had Peter's stage 1 high lift inlet and stage 1 regrind exhaust with the matching chip.

 

Part number in the pic below.

[SRDT 174]

Bosch do list 0280156045 injectors as compatible, you can find no less than 6 of them on some Opel/Vauxhall/Cadillac V6 fuel rails. They are used but also cheaper and much more likely to be genuine Bosch units when sold with the fuel rail.

[mmt 15]

Are these also a replacement for the green gti6 ones? Are the green ones better/more modern or is there also a replacement for green ones? 
 

thanks 

kinda hi jack -excuse. 

[welshpug 1,654]

No, gti6 are weber iw204, they flow quite a bit more,  though physically they fit the same so if you have a mappable ecu you can use them.

[mmt 15]

Thanks M

 

the spray pattern in my gti6 webers looks not so good. Was hoping to be able to buy a new and better re-placement. A professional cleaning costs the same as new ones here. 
 

engine runs ok but always on the Hunt for improvements.