1988 320 EFI injectors?
03-09-2016, 12:07 AM
#21
SB I believe that was for the 1994-95 350 Mag/EFI motor. The 320 had a front mounted TB. 94-95 motors had the same progressive side mount two stage TB the 454/502 Mag/EFI motors did. Lingenfelter worked on it with Merc for the 94-95 era motors but can't attest if he did collaboration with the 320 motor.
03-09-2016, 12:15 AM
#22
I can see BUP's point of view. Since marine injections are virtually all closed loop, there is no way for the computer to know a given injector is flowing too little fuel and creating a lean condition. In the automotive world, the O2 sensor tells the ECU whether or not the fuel curve is right. In the marine world the ECU is assuming everything is in spec.
Merc has used all sorts of injectors from the Bosch to Kehein (effectively Honda) injectors. Many of their injector part numbers don't cross reference thus anchoring Mercs monopolization of their systems. It can be a PITA when sourcing injectors. I actually took my manifiold, rail and injectors up to RC injection to flow test, compare and fit new injectors and do an A/B comparison between stock and aftermarket. Took time but was worth it.
BUPs advice is spot on and I'd follow it.
03-09-2016, 05:03 AM
#23
The 320 EFI's in my 88 272 are factory mercruiser racing before they went blue color, 320 HP at 5200-5400 rpm, the set up is a 4 bolt main block, forged crank and rods, bigger cam and roller tip rockers and tunnel ram batch multiport fuel injection. Alot different than the 260 hp version.
My camp is in Naples by the way.
Last edited by oconnor marine; 03-09-2016 at 09:44 AM. Reason: corrected
03-09-2016, 06:21 AM
#24
well this is a new setup for me, I still have my 88 242 ss bravo w/ 7.4 with cam, heads, tuned exhaust and high rise intake intake, around 420 hp 60mph.
The 320 EFI's in my 88 272 are factory mercruiser racing before they went blue color, 320 HP at 5200-5400 rpm, the set up is a 4 bolt main block, forged crank and rods, bigger cam better heads and roller tip rockers and tunnel ram batch multiport fuel injection. Alot different than the 260 hp version.
My camp is in Naples by the way.
The 320 EFI's in my 88 272 are factory mercruiser racing before they went blue color, 320 HP at 5200-5400 rpm, the set up is a 4 bolt main block, forged crank and rods, bigger cam better heads and roller tip rockers and tunnel ram batch multiport fuel injection. Alot different than the 260 hp version.
My camp is in Naples by the way.
Gold Member
03-09-2016, 07:42 AM
#27
03-09-2016, 08:54 AM
#28
Registered
I can see BUP's point of view. Since marine injections are virtually all closed loop, there is no way for the computer to know a given injector is flowing too little fuel and creating a lean condition. In the automotive world, the O2 sensor tells the ECU whether or not the fuel curve is right. In the marine world the ECU is assuming everything is in spec.
Jeff
03-09-2016, 09:01 AM
#29
Registered
The 320 EFI does in fact make 320 hp at the crank with marine exhaust. It also runs at about 11:1 A/F at full load so there is some power to be made there.
The heads are nothing special, same as a 260 head. Something you would find in a TPI Camaro.
It's a good durable package.
Jeff
The heads are nothing special, same as a 260 head. Something you would find in a TPI Camaro.
It's a good durable package.
Jeff
03-09-2016, 09:20 AM
#30
The 320 EFI does in fact make 320 hp at the crank with marine exhaust. It also runs at about 11:1 A/F at full load so there is some power to be made there.
The heads are nothing special, same as a 260 head. Something you would find in a TPI Camaro.
It's a good durable package.
Jeff
The heads are nothing special, same as a 260 head. Something you would find in a TPI Camaro.
It's a good durable package.
Jeff
