jss33

On 9/25/2021 at 7:16 AM, Greydog said:

Don't post them, our Postie keeps telling they were leaking 🤣🤣

If I buy a complete head,  as the cams on mine look poor, are the cams different on this model i.e 218 bhp standard ?

5 hours ago, Greydog said:

If the engine is stripped already my personal route would be another head assembly. Checked for flatness with a good straightedge and a torch. If OK I would fit new valves and springs and rebuild the engine. 

Always worth more as a running car than a project

I owe you a beer... or two! Thank you.

1 hour ago, Greydog said:

I assume ECU, Throttle Body and cams, As all the heads appear to be the same the only things variable are (a) Capacity (b) ECU program (c) Throttle Body (d) Camshaft duration/lift

I thought you were just rebuilding the motor in the X3 and looking for a head that would fit. Remember if you change the engine you will have to change the sump as it also mounts the front diff and has to have a Drive Shaft pass through it there are probably a few other differences I have not thought of. Best option would be the 3.0i engine from either the X3 or X5 both would need the corresponding ECU and the ECU would need matching to your existing chassis and other key control units 

Dave

 

I am torn between a head or engine replacement. I bought as is expecting it to be a simple head  skim and rebuild. The engineering company said it was too distorted, which I was surprised at, as these units are pretty bombproof. I am sick of breakers yards  advertising engines (at silly prices) with either no mileage, or false mileages quoted. If it was genuine, why not quote the VRM of the donor car so mileage can be checked via the VOSA website. TBH I struggle to find a helpful  and courteous breaker (apart from Quarry) at all. I found a lovely low mileage 130 head on eBay, but different bores obviously. I may try a second opinion on the head, or perhaps sell as a project. The car is a great spec in impeccable condition apart from the obvious, and too  good to break.

Thank you once again for your help!

Jim   

18 hours ago, Greydog said:

Hi Jim

I believe the valves in your head are Inlet 33mm Exhaust 30.5mm a quick look at the TIS and it seems to indicate all the heads up to the 3.0 use the same Cylinder Head /Valve combination The models it was used on are as follows

• 3' E46   (04/1997 — 12/2018)
• 5' E39   (02/1995 — 12/2003)
• 5' E60   (12/2001 — 02/2005)
• 5' E61   (10/2002 — 02/2005)
• 7' E38   (03/1995 — 07/2001)
• 7' E65   (07/2002 — 02/2005)
• 7' E66   (09/2002 — 02/2005)
• X3 E83   (01/2003 — 07/2006)
• X5 E53   (08/1999 — 09/2006)
• Z3 E36   (04/1996 — 06/2002)
• Z4 E85   (01/2002 — 11/2005)

It isn't until you get to the M3 that the intake changes to 35mm exhaust stays the same obviously cams are very different.

Just talked to a pal who runs a tuning company he informs me that your 2.5 motor in standard trim will give around 190 bhp and ecu tune on its own would lift it to 210 ish bhp with cams some intake work and a better exhaust around 250 is easy to achieve. If the motor were changed to the 3.0i 250bhp  is your starting point.

Hope this helps you

Dave

Might be easier to buy a complete  lump ? How is the extra m Sport bhp (218)produced? Is it the head  , or ecu software? 

Thanks again. 

Do you know if the 2.5 heads are different,  I.e. is the M Sport different valve sizes etc?

Might be easier to buy a complete  lump ? How is the extra m Sport bhp (218)produced? Is it the head  , or ecu software? 

Thanks Dave , really appreciated! 

We have an X3 M Sport 2.5si with a cooked engine.  We sent the head to be skimmed and were told it was too distorted. Can we fit any n52 head, or is the M Sport fitted with different valves? Code is N52K B25a