6.9 or 7.3
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Freshman User
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6.9 or 7.3
I'm considering an idi diesel for my bronco. I've talked to kenpobuck and after reading some the posts on here I'm wondering should the 7.3 be avoided? Also what kind of power and torque are these motors capable of reliably. Are there differences such as some heads better than others or are they pretty much all the same?
Thanks
Thanks
Tuned
Joined: Oct 2005
Posts: 392
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From: Panther Branch, NC
there's no such thing as a 6.9 with 7.3 heads and further more the only difference in the heads is the head bolt size is bigger on the 7.3 to help with clamping force due to the little higher compression ratio.
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Fleet Owner
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From: Brentwood,CA
Not true! The glow plug angle was chnged and the injectors were retracted to lower compression. The 7.3 has lower compression than a 6.9.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Actually the pre combustion chambers are larger in the 7.3 heads which is why the compression dropped from 22.5 to 1 to 21.5 to 1.
6.9 = 18.34 cm3
7.3 = 20.42 cm3
Yes the injectors were retracted, but that was for emissions.
Also the glow plug angle changed to move the glow plug tip in the precup chamber.
Head design changes -
6.9 features "centered" glow plugs, while 7.3 are "off-center"
Injection nozzles have been retracted on the 7.3 .060" to facilitate Federal and state emission certs.
6.9 = 18.34 cm3
7.3 = 20.42 cm3
Yes the injectors were retracted, but that was for emissions.
Also the glow plug angle changed to move the glow plug tip in the precup chamber.
Head design changes -
6.9 features "centered" glow plugs, while 7.3 are "off-center"
Injection nozzles have been retracted on the 7.3 .060" to facilitate Federal and state emission certs.
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Freshman User
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So are there any issues I should look for that should be considered deal breakers when buy one of these motors? I might try to find 7.3 turbo. Did they put the E40D behind any of those? The only things I know about these motors is what I've read on this forum lately. Thanks for the input.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
My preference would be an 87 6.9.
Best year for the 6.9, thicker cylinder walls that allow a bore and rebuild, less issues with cavitation.
However when you tear it down, if you are planning on a turbo, use head studs when you put it back together.
A diesel E4OD will bolt to either motor.
Best year for the 6.9, thicker cylinder walls that allow a bore and rebuild, less issues with cavitation.
However when you tear it down, if you are planning on a turbo, use head studs when you put it back together.
A diesel E4OD will bolt to either motor.
