BMW M51 Questions
BMW M51 Questions
Are these a straight swap with a M51 electronic inline pump? Obviously when converting I'd need a 3 series accelerator pedal and cable, is anything else required?
![[Image: IMG_7019.jpg]](http://s29.postimg.org/x83epz3kz/IMG_7019.jpg)
Next, I want to try run this pump (which will have a 12mm head) with my 12cm HX35. Is this just being over ambitious or is it likely to spool it?
![[Image: 12029101_1163339573681503_42192877_n.jpg]](http://s23.postimg.org/kpfigou0n/12029101_1163339573681503_42192877_n.jpg)
Other plans are 3" exhaust, boost controller, large aftermarket FMIC, boost gauge, EGT gauge, external wastegate possibly, maybe water meth.
Lastly, I assume that for over 250 bhp I will need ARP head studs, does anyone know if any other BMW engines have the same size/thread/length head studs? ARP don't stock any directly for the M51.
Hi all, I have recently acquired a M21 mechanical inline pump.
Are these a straight swap with a M51 electronic inline pump? Obviously when converting I'd need a 3 series accelerator pedal and cable, is anything else required?
Next, I want to try run this pump (which will have a 12mm head) with my 12cm HX35. Is this just being over ambitious or is it likely to spool it?
Other plans are 3" exhaust, boost controller, large aftermarket FMIC, boost gauge, EGT gauge, external wastegate possibly, maybe water meth.
Lastly, I assume that for over 250 bhp I will need ARP head studs, does anyone know if any other BMW engines have the same size/thread/length head studs? ARP don't stock any directly for the M51.
whitey1986
03-05-2016, 01:16 PM #2What engine model/year do you have? If it is the earlier engine with alloy inlet manifold then you will need to make a spacer for the boss on the mechanical pump as it's like 2" dia whereas the later engine block has a 3.5" dia hole
(03-05-2016, 01:16 PM)whitey1986 What engine model/year do you have? If it is the earlier engine with alloy inlet manifold then you will need to make a spacer for the boss on the mechanical pump as it's like 2" dia whereas the later engine block has a 3.5" dia hole
Well after some headache I figured this out for myself, upon pump removal I managed to snap one of the lugs (FFS it was so close to completion)!
Now I'm kinda set back a lot as I need another pump or need to repair this one. Would welding it likely damage internals?
Also, where would you get a spacer or what would you use to make a spacer to fit over the end of the pump?
Picture to show size difference of either pumps end, the mechanical one obviously needs a spacer and currently causing major oil leak:
![[Image: IMG_6791.jpg]](https://s29.postimg.org/ulk8mkupf/IMG_6791.jpg)
![[Image: IMG_6792.jpg]](https://s29.postimg.org/3p09e9bw3/IMG_6792.jpg)
Picture to show the snapped part of pump in question about welding:
![[Image: IMG_6782.jpg]](https://s29.postimg.org/sshby99ir/IMG_6782.jpg)
Any help much appreciated to try finish this off.
(03-05-2016, 01:16 PM)whitey1986 What engine model/year do you have? If it is the earlier engine with alloy inlet manifold then you will need to make a spacer for the boss on the mechanical pump as it's like 2" dia whereas the later engine block has a 3.5" dia hole
Well after some headache I figured this out for myself, upon pump removal I managed to snap one of the lugs (FFS it was so close to completion)!
Now I'm kinda set back a lot as I need another pump or need to repair this one. Would welding it likely damage internals?
Also, where would you get a spacer or what would you use to make a spacer to fit over the end of the pump?
Picture to show size difference of either pumps end, the mechanical one obviously needs a spacer and currently causing major oil leak:
Picture to show the snapped part of pump in question about welding:
Any help much appreciated to try finish this off.
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Ex: 525tds 130kW, C250TD 160kW, E320CDI 200kW, ML400CDI 230kW, A6 R5TDI 130kW
Now: Q7 V8TDI 240kW, 320d 150kW, 335d 210kW
Could be welded of only stripped to parts.. seals will burn. Spracer is simple ring turned on lather with notch for O ring to seal against block.
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Ex: 525tds 130kW, C250TD 160kW, E320CDI 200kW, ML400CDI 230kW, A6 R5TDI 130kW
Now: Q7 V8TDI 240kW, 320d 150kW, 335d 210kW
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