Is it possible to use 250 efi downdraft intake on older 250efi ?

[LOSTINJ]

Is it possible to install late model 250 efi downdraft intake on older twin ecu 250 efi ? TO BE CLEAR not referring to 300 x , rather 250 efi downdraft . I know it will bolt right on , question what injector do I use ?

Thanks

[Aaronhl]

Good question see how the push rods line up on both

Im going to say not without modification because the blocks are cast differently in some areas

[LOSTINJ]

Thanks ! I installed 300x intakes on older 3 litre with minimal fuss so I know its a direct bolt on other than bell crank and rods which I have piles of , question is use what injector to work with older twin ECU

[Aaronhl]

Thats a good question hopefully someone else will answer because I am not sure if the older white tips will work with the newer motorola ecu

[LOSTINJ]

Exactly !! Thanks for reply

[Aaronhl]

Exactly !! Thanks for reply

Maybe a lot of electrical work cuz the sensors that plug into the ECU are different on each, including the external oil pump and VST plugs

[LOSTINJ]

Again I used a 300x intake with on older 3 250 . I simply need to know what injector to use

[LOSTINJ]

All above are my Shaun Torrente STR engines that genius built me that lasted . He built the long blocks ONLY , 10 min on test stand before they started coming apart , paid him big money and he just said oh well . Keep hoping for Karma like a fiery boat wreck !

[Chaz]

Larry, when you say intake.
Do you mean just the plenum than throttle body or the reed adapter plate that mounts the injectors internally as well ?

If externally, the white tip 14 ohm injectors that came in all early models.

If internally, you will need a 12-14 ohm Deca (short) type injector.

[LOSTINJ]

Im not referring to the 300x style with injector in reed plate . Im using the internal OEM 2003 250 efi induction on older twin ecu junk . What injector came on 2003 250 efi ? Thanks
Larry

[Chaz]

If internally, you will need a 12-14 ohm Deca (short) type injector.

[LOSTINJ]

and the Deca 12-14 ohm is 100 % capable with this old twin ecu hunk of **** ?

Thanks big guy

[Chaz]

Yes .. the early model (Denso) twin pack motors fired two injectors at one time. All it could handle was a saturated (12-14 ohm) injector. Back then they used a white tip Keihin (Bosche type) injector that blew aprox. 500 cc / min.

The later Motorola had six injector drivers that could be configured to run either a pink tip (2 ohm) Keihin 300x or a (12-14 ohm) Deca 225-250 injector.

Not knowing the port timing and compression of your motors, your best bet is to have your injectors flowed at different pressure levels. (43.5 to 55) 5 psi one way or the other might be the difference between 490, 500 and 510 cc/min. Which would cover the 250 to 300+ HP range pretty well .

[Aaronhl]

Well mr 3 liter has spoken

[hooken203]

I think I bought a down draft complete fuel system from you. I sure didn’t like the sound of your engine only lasted 10 minutes. But I would really appreciate all those pictures like the ones above. I will take all you can send me. I bought a basket case so I didn’t take it apart. The guy I bought it from did a very good job of bagging and labeling all the parts. But a bunch of pictures could really help.