jamhoney Posted February 27, 2004 Report Share Posted February 27, 2004 I saw someone said that there are differences between the 3100 and the 3.1 engines. Is this true and if so what are they? Did the 95 base Luminas have the 3100 in them? Quote Link to comment Share on other sites More sharing options...
godofthunder Posted February 27, 2004 Report Share Posted February 27, 2004 the first 3100s jumped up to 160HP, and then the second up to 175. a 3.1 was 140. Also...correct me if im wrong...the 3100 went to Sequential Fuel injection than MPFI. jon Quote Link to comment Share on other sites More sharing options...
gimp19 Posted February 27, 2004 Report Share Posted February 27, 2004 the first 3100s jumped up to 160HP, and then the second up to 175. a 3.1 was 140. Also...correct me if im wrong...the 3100 went to Sequential Fuel injection than MPFI. jon Yeah, there basically completly differant engines. The 3.1 is pretty much the same as a 2.8 but with a differant bore. Quote Link to comment Share on other sites More sharing options...
slick Posted February 27, 2004 Report Share Posted February 27, 2004 From what i have heard, the 3100's are only sfi for a few thousand rpm's, then turn into mpfi or vise versa. 3100's have been made to run mpfi and on 3.1 comps for people to mate up 5-speeds to them. Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted February 27, 2004 Report Share Posted February 27, 2004 Everything is different. It would be easier to list what's NOT different. I know the water pump is not different. My memory isn't the best, but I think the crankshaft may have been the same too. Maybe the starter too? Anyway, most of it is different. Quote Link to comment Share on other sites More sharing options...
dbtk2 Posted February 27, 2004 Report Share Posted February 27, 2004 They are very similar, but very different engines. The block is the same, but all the internals are different. The heads are different, the intake manifolds are different, the throttle body is different. It is SFI instead of MPFI, and many many many other things. BTW...that is a badass GTP. Shawn Quote Link to comment Share on other sites More sharing options...
92turboLE Posted February 27, 2004 Report Share Posted February 27, 2004 arent the 3100 9.5:1 compression as qopposed to the 8.something for the 3.1MPFI??? - Justin Quote Link to comment Share on other sites More sharing options...
dbtk2 Posted February 27, 2004 Report Share Posted February 27, 2004 arent the 3100 9.5:1 compression as qopposed to the 8.something for the 3.1MPFI??? - Justin yeah, the 3100 is 9.5 or 9.6:1 compression wheareas the 3.1L has 8.9:1 compression. Shawn Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted February 27, 2004 Report Share Posted February 27, 2004 The block is the same, but all the internals are different. No, the block is not the same. They are very different. The 3100 block is designed for roller cam and was redesigned for increased stiffness. It also has a hole for cam position sensor. Quote Link to comment Share on other sites More sharing options...
dbtk2 Posted February 27, 2004 Report Share Posted February 27, 2004 The block is the same, but all the internals are different. No, the block is not the same. They are very different. The 3100 block is designed for roller cam and was redesigned for increased stiffness. It also has a hole for cam position sensor. I thought it was the same block but modified for the roller cam? Shawn Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted February 27, 2004 Report Share Posted February 27, 2004 Nope, different. The 3100 block has more "webbing" cast into it for stiffness. Something about the oil filter mount is different as well, because you can't use a 3.1L oil cooler on that block, you have to get one for a 3100. There's a lot more different than just that, I just can't remember right now. Quote Link to comment Share on other sites More sharing options...
grandprix104 Posted February 27, 2004 Report Share Posted February 27, 2004 related question - what is the difference between MPFI and SFI? Quote Link to comment Share on other sites More sharing options...
slick Posted February 27, 2004 Report Share Posted February 27, 2004 Someone ought to get pictures of a 3100 and a 3.1 block side by side. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted February 27, 2004 Report Share Posted February 27, 2004 related question - what is the difference between MPFI and SFI? MPFI fires a bank of injectors (3) at a time. SFI fires each cylinder's injector to coincide with the opening of that cylinder's intake valve on the intake stroke. Quote Link to comment Share on other sites More sharing options...
god910 Posted February 27, 2004 Report Share Posted February 27, 2004 Yup, starter is the same, Curtis tipped all us TGP guys to the fact. The 3100 starter is a mini Hi-Torque compared to the 3.1. Quote Link to comment Share on other sites More sharing options...
EurosportZ34 Posted February 28, 2004 Report Share Posted February 28, 2004 Here's the low down on the 3.1L MPFI... Displacement: 3135cc Compression Ratio: 9.0:1 Peak Horsepower: 140 Peak Torque: 185 Redline: 6000 rpm Valves: 12 Cylinders: 6 Type: Generation II Here's the low down on the 3.1L "3100" SFI... Displacement: 3130cc Compression Ratio: 9.6:1 Peak Horsepower: 160 Peak Torque: 185 Redline: 6000 rpm Valves: 12 Cylinders: 6 Type: Generation III Quote Link to comment Share on other sites More sharing options...
Brian P Posted February 28, 2004 Report Share Posted February 28, 2004 Here's the low down on the 3.1L MPFI...Displacement: 3135cc Compression Ratio: 9.0:1 Peak Horsepower: 140 Peak Torque: 160 Redline: 6000 rpm Valves: 12 Cylinders: 6 Type: Generation II Where the hell did that info come from? 160 torque?? 9.0 compression? Man come on.... Quote Link to comment Share on other sites More sharing options...
jamhoney Posted February 28, 2004 Author Report Share Posted February 28, 2004 Thanks for all the information. Does anyone know which engine would usually last longer? Someone ought to get pictures of a 3100 and a 3.1 block side by side. Yeah that would be cool. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted February 28, 2004 Report Share Posted February 28, 2004 Here's the low down on the 3.1L MPFI...Displacement: 3135cc Compression Ratio: 9.0:1 Peak Horsepower: 140 Peak Torque: 160 Redline: 6000 rpm Valves: 12 Cylinders: 6 Type: Generation II Where the hell did that info come from? 160 torque?? 9.0 compression? Man come on.... Yeah, really, try 8.8 CR and 185 Tq Quote Link to comment Share on other sites More sharing options...
EurosportZ34 Posted February 28, 2004 Report Share Posted February 28, 2004 That's what you get from searching thru all the truthfull sites online. Quote Link to comment Share on other sites More sharing options...
Brian P Posted February 29, 2004 Report Share Posted February 29, 2004 160 torque is like....the 2.8 in a J body or something. Info you find on sites is some the times inaccurate, including this one. 60 degree is the most accurate besides GM sites Quote Link to comment Share on other sites More sharing options...
regalized Posted February 29, 2004 Report Share Posted February 29, 2004 i dunno any differences in them but i had a 94 beretta and it had a 3100 sfi and i have a 94 lumina and a 91 regal with the 3.1 mpfi and they are more dependable then the 3100 was, again just my opinion, and experience with the 2 motors Quote Link to comment Share on other sites More sharing options...
Go4DaMo Posted March 20, 2014 Report Share Posted March 20, 2014 Can the fuel regulator from a 3100 fit a 3.1? Thanks for all the information. Does anyone know which engine would usually last longer? My family's experience would yield the 3.1 more reliable. Quote Link to comment Share on other sites More sharing options...
l67ss Posted March 20, 2014 Report Share Posted March 20, 2014 Not likely, even if it fit i imagine thered b psi issues Can the fuel regulator from a 3100 fit a 3.1? My family's experience would yield the 3.1 more reliable. Quote Link to comment Share on other sites More sharing options...
Go4DaMo Posted March 20, 2014 Report Share Posted March 20, 2014 would running 3100 injectors help? Quote Link to comment Share on other sites More sharing options...
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