Are the 92 & 93 motors the same? And...
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scotth48 (07-10-2019)
06-07-2019, 09:08 AM
#5
Le Mans Master
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Good questions:
And, IIRC, engines spanning from 92-96 (LT1s) were initially MAP motors, and switched to MAF (mass air pressure vs. mass air FLOW) at some point. (MAF can accommodate minor mods to the intake and exhaust w/o having to be tuned.) And, I'll have to check, or maybe someone has the reference handy, but were ALL 92-96 LT1s sequentially injected, or were there some years where they were BATCH injected (as were some L98s)??
And, IIRC, engines spanning from 92-96 (LT1s) were initially MAP motors, and switched to MAF (mass air pressure vs. mass air FLOW) at some point. (MAF can accommodate minor mods to the intake and exhaust w/o having to be tuned.) And, I'll have to check, or maybe someone has the reference handy, but were ALL 92-96 LT1s sequentially injected, or were there some years where they were BATCH injected (as were some L98s)??
06-07-2019, 09:39 AM
#6
Team Owner
Pro Mechanic
Good questions:
And, IIRC, engines spanning from 92-96 (LT1s) were initially MAP motors, and switched to MAF (mass air pressure vs. mass air FLOW) at some point. (MAF can accommodate minor mods to the intake and exhaust w/o having to be tuned.) And, I'll have to check, or maybe someone has the reference handy, but were ALL 92-96 LT1s sequentially injected, or were there some years where they were BATCH injected (as were some L98s)??
And, IIRC, engines spanning from 92-96 (LT1s) were initially MAP motors, and switched to MAF (mass air pressure vs. mass air FLOW) at some point. (MAF can accommodate minor mods to the intake and exhaust w/o having to be tuned.) And, I'll have to check, or maybe someone has the reference handy, but were ALL 92-96 LT1s sequentially injected, or were there some years where they were BATCH injected (as were some L98s)??
'92-'93 were MAP and batch fire
'94-'96 had MAF, '96 had MAF and MAP like most OBD II, and were sequential inj.
^None of those changes had anything to do w/the engine itself; that would be car/harness/ECM. Only engine changes that I'm aware of are valve covers and cam changes.
ALL L98 was batch fire.
07-08-2019, 07:28 PM
#8
Le Mans Master
Just a couple things. Corvette always 4 bolt block. Everything else mostly 2 bolt.
92-93 lt1 corvette only difference valve covers. F body different accessory brackets and 2 bolt block
94 corvette and F body still use Opti I (spline)
Full size cars gets iron head LT1 (5.7) and L99 (4.3) Opti II ( pin)
95-97 all use Opti II
96-97 have crankshaft position sensor.( OBD2)
Essentially 3 different timing covers 92-94 spline, 94-95 pin, and 96-97 with cps. 3 valve covers 92 magnesium 93-96 Corvette composite and all others stamped steel. Corvette and F body use different and non interchangeable flywheels.
96 m6 corvette and 97 Limited production SLP F body m6 LT4.
Fuel systems changes 92-93 MPFI speed density PCM uses replaceable prom (chip)
94-95 SFI. MAF OBD1 PCM is reprogrammed
(eprom)
96-97 same as above but OBD2
GM vin P LT1 regardless of application.
92-93 lt1 corvette only difference valve covers. F body different accessory brackets and 2 bolt block
94 corvette and F body still use Opti I (spline)
Full size cars gets iron head LT1 (5.7) and L99 (4.3) Opti II ( pin)
95-97 all use Opti II
96-97 have crankshaft position sensor.( OBD2)
Essentially 3 different timing covers 92-94 spline, 94-95 pin, and 96-97 with cps. 3 valve covers 92 magnesium 93-96 Corvette composite and all others stamped steel. Corvette and F body use different and non interchangeable flywheels.
96 m6 corvette and 97 Limited production SLP F body m6 LT4.
Fuel systems changes 92-93 MPFI speed density PCM uses replaceable prom (chip)
94-95 SFI. MAF OBD1 PCM is reprogrammed
(eprom)
96-97 same as above but OBD2
GM vin P LT1 regardless of application.