by the way!!
difference between 91 and 95 efi 460
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Senior User
Joined: Mar 2003
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From: SOUTHERN NEW JERSEY
difference between 91 and 95 efi 460
I noticed in the Chiltons book they rated the 95 460 to have almost 20 more hp? Is there a difference between the two? I looked at the specifications and I cannot see any difference in them ie.. valves, cam lifts,pistons,etc....
Anyone know?
Matt
Anyone know?
Matt
Mountain Pass
Joined: Aug 2004
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From: Tacoma, WA.
Originally Posted by c_rossman
heads changed in 93, much better, biggervalves, fast burn chambers.
Both utilise a very small raised high velocity intake port passage of about 210 CC's where the doves are about 270 and the iron cj's are about 320.
There were some ECM changes in 93 that are also responsible for the increased power.
Regards,
SMJ/RHP
http://reincarnation-automotive.com
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Senior User
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From: SOUTHERN NEW JERSEY
Thanks for the info, would finding a 93 ecm build more power by its self? or does the ecm have to go with the rest of the parts? Would it hurt to through a 93 ecm in? My engine and heads run A-OK! (knockin-on-wood). Was curious as to why the power difference. Even if it gave alil more power with just the ecm change.
Matt
Matt
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From: Central California
Originally Posted by neversosure
would finding a 93 ecm build more power by its self? ---------------- Even if it gave alil more power with just the ecm change.
Matt
Matt
If you're anxious to get some more hp, put on a set of headers. They provide the best hp boost for the buck IMHO. The Banks Power Pack claims 70hp gain at the rear wheels and there are other header makers that are good but less expensive choices, look around.
-otf
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From: SOUTHERN NEW JERSEY
Shaking up this post!!!! Ok I have found a donor truck a 95!! I am going to start soon. Anyone have any tips or clues to working with the ECM?
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Post Fiend
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From: New Jersey
92-94 E-series and F-series are plug and play interchangable, and the 95-96 ones are interchangable. The 95/96 EEC's have ODB-II, not a good thing for an older truck.
Anyway, each year, 92-94, the timing curve got more aggressive. Especially on automatic trans EEC's.
Anyway, each year, 92-94, the timing curve got more aggressive. Especially on automatic trans EEC's.
Junior User
Joined: Apr 2004
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From: Gladstone, MO
Originally Posted by frederic
92-94 E-series and F-series are plug and play interchangable, and the 95-96 ones are interchangable. The 95/96 EEC's have ODB-II, not a good thing for an older truck.
Anyway, each year, 92-94, the timing curve got more aggressive. Especially on automatic trans EEC's.
Anyway, each year, 92-94, the timing curve got more aggressive. Especially on automatic trans EEC's.
Richard
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From: Cottondale, Texas
Originally Posted by House Husband
There is another choice of ECM that should work. 1994-1997 F53 (motorhome). EEC-IV (OBD-I), AIR, no cat, 245 HP.
Richard
Richard
Trailering
Joined: Jun 2016
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From: Oregon
Oddly enough I have the exact combinations. 1991 driver 4x4 and a 1995 parts truck complete, 2x4 blown transmission. going to be swapping out bed, interior parts, seat, and front clip.
Back to the EFI stuff though, would be swapping the MAP to MAF a worthy project? since I have the donor sitting right there?
Back to the EFI stuff though, would be swapping the MAP to MAF a worthy project? since I have the donor sitting right there?
Laughing Gas
Joined: Jul 2009
Posts: 1,032
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From: NE Ohio
20-year-old Zombie thread!
Just to clarify, the F3TE heads have slightly larger valves and 91.5cc chambers. E7s have 96cc chambers.
Pistons: The '93-97s have a piston with a .020" taller compression height (1.772") for a tighter quench in the quench side of the chamber to promote a better swirl and less chance of detonation, BUT they have a deeper dish in the open area of the chamber (15cc dish) as compared to the shorter earlier 1.752" piston that has a 8cc dish. The total combustion volume remains the same, thus they have the same compression ratio of 8.6-ish to 1...
Both the '91 and '95 use the same EEC-4 speed density, batch fire injection.
There was a CA-spec '96-97 7.5L that was EEC-V mass-air sequential injection. To change over, you need the entire firewall-forward body wiring harness from a CA truck, AND the PCM computer, AND the engine wiring harness, AND the injector harness, PLUS all of the various sensors... AND the CA-spec EGR tube with DPFE sensor, AND the special harmonic balancer spacer with the attached 'star' reluctor for the crank-position sensor, AND the CA-spec timing cover to mount the crank-position sensor...AND the CA aircleaner assembly to utilized the mass-air sensor...
Just to clarify, the F3TE heads have slightly larger valves and 91.5cc chambers. E7s have 96cc chambers.
Pistons: The '93-97s have a piston with a .020" taller compression height (1.772") for a tighter quench in the quench side of the chamber to promote a better swirl and less chance of detonation, BUT they have a deeper dish in the open area of the chamber (15cc dish) as compared to the shorter earlier 1.752" piston that has a 8cc dish. The total combustion volume remains the same, thus they have the same compression ratio of 8.6-ish to 1...
Both the '91 and '95 use the same EEC-4 speed density, batch fire injection.
There was a CA-spec '96-97 7.5L that was EEC-V mass-air sequential injection. To change over, you need the entire firewall-forward body wiring harness from a CA truck, AND the PCM computer, AND the engine wiring harness, AND the injector harness, PLUS all of the various sensors... AND the CA-spec EGR tube with DPFE sensor, AND the special harmonic balancer spacer with the attached 'star' reluctor for the crank-position sensor, AND the CA-spec timing cover to mount the crank-position sensor...AND the CA aircleaner assembly to utilized the mass-air sensor...
Trailering
Joined: Jun 2016
Posts: 17
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From: Oregon
wow, thank you much for the detailed response. looks like MAP it is. LOL. even though the parts truck is complete that is way more than needed.
one other question, if a guy were to put the 95 460 in the shop, flat top pistons and head work and such, does all the bolt holes in the block and heads and such, for stock bolt ons, fit from the 91 if I were to start the engine build ahead of time?
Thanks again
one other question, if a guy were to put the 95 460 in the shop, flat top pistons and head work and such, does all the bolt holes in the block and heads and such, for stock bolt ons, fit from the 91 if I were to start the engine build ahead of time?
Thanks again