gniknave
Praise the Lowered
Offline
4777 posts
90 Infiniti Q45, 05 Nissan Titan LE Crew Cab
Fishers In
8-26-2004
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| « Re: Has anyone installed a 1994 engine into an earlier Q45? (Q45denver) | 10:45 PM 10/29/2004 |
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Check out my Cardomain page and see page 3. There are pictures of my engine work that was done. The pictures are of my old 90 engine and newer 90-93 engine. There is a difference, but I can't remember exactly what it is. Maybe you can tell by pics.
'05 Nissan Titan Crew Cab LE
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Q45denver
Offline
941 posts
1995 Q45t 1990 Q45 1998 Nissan Frontier
Denver CO
7-25-2002
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| « Re: Has anyone installed a 1994 engine into an earlier Q45? (gniknave) | 4:01 AM 10/30/2004 |
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The change occured in the 1994 model year. Visual clues are the throttle body and CAS look different. Not sure about the 1996 looks the same?
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gniknave
Praise the Lowered
Offline
4777 posts
90 Infiniti Q45, 05 Nissan Titan LE Crew Cab
Fishers In
8-26-2004
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| « Re: Has anyone installed a 1994 engine into an earlier Q45? (Q45denver) | 12:30 PM 10/30/2004 |
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I'm pretty sure 94-95 are the same, but I believe 96 dropped variable valve timing.
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Q45denver
Offline
941 posts
1995 Q45t 1990 Q45 1998 Nissan Frontier
Denver CO
7-25-2002
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| « Re: Has anyone installed a 1994 engine into an earlier Q45? (Q45denver) | 11:34 AM 11/1/2004 |
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Does anyone know if the 1993 Q engine looks the same visually as the 1994? A local shop that specializes in JDM takeout engine replacements said that there was a change to a camshaft sensor in 1993 that carried over to 1994 and latter engines and he thought that the 1993 model year Q45 engine looked the same as the 1994. If that it the case then the 1993 engine that I got for my 1990 could in fact be a 1993 and not a 1994 or latter engine as I had initially thought. Also he said that they swap the fuel injection system with what is currently on my car because the JDM FI is different and they can't legally use the one on the JDM engine. He is quoting me $1250 for the engine and $900 to install it with a 2 year warranty. He said that would include swapping the parts off my old engine. So price wise it sounds like the best way to go since no one else in town seems to warranty these used engines. I just need to check their references and hope that the car will make it to their shop which is on the other end of town. One thing that had me a little concerned is the low price and that the owner drives a 1991 Q45 but had never heard of the problem with the timing chain guides.
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Q45tech
Q45 Guru
Offline
13721 posts
1990 Q45 323,000 miles 19.5 years ownership
Marietta , Georgia
4-30-2002
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| « Re: Has anyone installed a 1994 engine into an earlier Q45? (Q45denver) | 3:57 PM 11/1/2004 |
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Most 94Q were made in 1993, thus the confusion.
The model year 90-93 Q engines are externally identical, harness connector wise.Obviously TCS, and active Q have differening minor harness additions or changes.......extra harness for extra temp sensor under plenum, stuff for TCS motor and auxillary extra TPS, California egr temp sensor addition, etc. The 94 show up as different harness module [transistor driver] for ignition coils, CAS shape and connectors, drivers side front vacuum control solenoids for evap cannister, etc.
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q man bk
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16 posts
1-22-2005
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the difference is the distributer on front drivers side of eng. next to charcoal can. the distr. are have different plugs, u will need the plug from the 94 eng. cut/mend back wires for it 2 work on 90-93 engines been done many, many times before
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SOCAL91Q45a
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403 posts
So CA
8-16-2003
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| « Re: (q man bk) | 7:03 PM 2/10/2005 |
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According to Joe @ everythingnissan ... when I investigated this last year . . the block, crank, rods, pistons, bearings bottom end internals etc ... for the 94 were all the same parts numbers as the 91-93. The heads plenum and multiple accessories were very different. I had a bad rod knock in my 1991 Q45a. I bought a 1994 Japanese CRATED motor - never ran, still with all the factory paper protectors over the intakes etc ... - took my 1991 A heads off - had em up gussied up, and slapped em on that 1994 Bottom end. So far so good - motor and car are to be reanimated in the next 15 days or so. Now going thru and doing all the maint that was negleced by prev owners for 180k ....
1991 Q45a - Project
2000 Ford Excursion - spousal units rig
2001 Ford F350 Powerstroke Diesel 4x4
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DAEDALUS
Offline
6231 posts
1990 Q45
El Segundo, CA
7-22-2002
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Was it a close decision? I mean, why not get used parts from '94 heads and keep the entire new long block?
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SOCAL91Q45a
Offline
403 posts
So CA
8-16-2003
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DAEDALUS,Im not sure I comprehend your query ... I have a 1991 Q45a ... 1991 Intake manifold and accessories etc ... I needed to have a 1991 not a 1994 motor :-) I kept the complete 94 heads, as the ones from my 91 seemed fine - except for some routine cleanup one would do when doing a rebuild. We werent aware the 94 head parts were direct bolt ons. I know that the Valves are different in the 1991's vs. 94's - sodium filled? Thought it would be better to have a complete set of 1994 heads for resale or spare, than 2 sets of heads dismantled. Hope I answered the right question you had.
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