XR6 to EFI

[Baldy 17]

Ok all my extremely knowledgeable Merc fans. This is going to take a while to read so thank you for all that do. I had a 2003 150EFI that the block needed to be replaced, so I picked up. 2003 150xr6. Now I know there’s a difference in the cylinders with the exhaust ports and with the front end cap but if I was to put the front end cap off my EFI and use new pistons for xr6 then put the pistons on the rods from the Efi, because the crank and rods are the same part number, for both engines,and put all my parts from the Efi on will this run? Now I know I’m going to have to do some fabricating to make some of the parts bolt on the block, but if I can do that would this motor work? In theory I think it would. So any help would be appreciated and thanking all in advance.

 

[Dukedog]

tha XR6 and 2.5 efi rotating assembly are tha same.. front half and block half of both 150's are tha same.. you only need ta change tha reed plate to tha efi reed plate (reeds are same also) as for any any "block" assembly parts are concerned.. tha rest is "bolt on" efi parts.. ie: efi assy parts, linkages, electrics, etc.. you should not have to "modify" anything on tha block at all... both motors are built from tha same rotating assembly (although different part numbers) ....

 

[Dukedog]

tha XR6 and 2.5 efi rotating assembly are tha same.. front half and block half of both 150's are tha same.. you only need ta change tha reed plate to tha efi reed plate (reeds are same also) as for any any "block" assembly parts are concerned.. tha rest is "bolt on" efi parts.. ie: efi assy parts, linkages, electrics, etc.. you should not have to "modify" anything on tha block at all... both motors are built from tha same rotating assembly (although different part numbers) ....

sorry, but tha above is mostly bogus.. they all changed in 2002 when tha "downdraft" air delivery and alternator chargin' stuff showed up......

 

[Chris1956]

Why not just run the XR6?

 

[Baldy 17]

It’s a disaster, was a saltwater motor. My 150 has almost all new parts so I know what I have. Got the xr6 just for the block.

 

[Dukedog]

It’s a disaster, was a saltwater motor. My 150 has almost all new parts so I know what I have. Got the xr6 just for the block.

you can look it over really good.. tha basic "rotating assembly" (both block halves, pistons rods and crank may still be tha same???.. still justa a 2.5 block assy... if both blocks are 2003 they should be tha same whether efi or carb... they don't build a separate efi block anda separate carb block if history holds true... i quite doin' this stuff (production motor stuff) 'bout tha time they went ta tha downdraft and alternator on everything efi... good luck which ever way ya go.

 

[Baldy 17]

you can look it over really good.. tha basic "rotating assembly" (both block halves, pistons rods and crank may still be tha same???.. still justa a 2.5 block assy... if both blocks are 2003 they should be tha same whether efi or carb... they don't build a separate efi block anda separate carb block if history holds true... i quite doin' this stuff (production motor stuff) 'bout tha time they went ta tha downdraft and alternator on everything efi... good luck which ever way ya go.

Thanks for the advice I greatly appreciate it. Think I’m going to go ahead with original plan
And combine the two. Thanks again

 

[Dukedog]

think you'll be fine with it.. i do know that a production efi fuel delivery is justa an "add on" ta any of tha 2.5's.....

let us know what ya find jus ta satisfy my curiosity!!!..

 

[Baldy 17]

think you'll be fine with it.. i do know that a production efi fuel delivery is justa an "add on" ta any of tha 2.5's.....

let us know what ya find jus ta satisfy my curiosity!!!..

I’ll post a video of it running........... I hope thanks again