95oldsVan Posted January 26, 2006 Report Share Posted January 26, 2006 My 91 Lumina has the boxy looking mpfi Intake set up that many of you are all so familiar with.I wanted to know if there was a HP restriction due its design,runner length or height?Is it aimed at torque more than HP? Are the later models with the 3100 spidery looking manifolds better for flow? Just wanted to know what some of you think or know about it.Thanks. Quote Link to comment Share on other sites More sharing options...
stockgp Posted January 26, 2006 Report Share Posted January 26, 2006 i believe they are aimed for torque, as he 95 era 3100 only has 5 more ft/lbs of torque, but 20 more horses than the 3.1. Quote Link to comment Share on other sites More sharing options...
95oldsVan Posted January 26, 2006 Author Report Share Posted January 26, 2006 i believe they are aimed for torque, as he 95 era 3100 only has 5 more ft/lbs of torque, but 20 more horses than the 3.1. Cool...but would you know exactly why the newer engine makes 20 more HP? what rpm does it do that as compared to the older 3.1? I know cam and head design can also contribute as well as a better flowing intake manifold.Was just wondering a bit more about the specs to get an idea how much of a difference the 2 had. Quote Link to comment Share on other sites More sharing options...
stockgp Posted January 26, 2006 Report Share Posted January 26, 2006 i'm not sure about the rest, but i know the 3x00 intakes are better flowing than the 3.1. and i think the 200+ 3x00 intakes are the best flowing of all. check the w-body main page for hp@rpm numbers. i think they are there Quote Link to comment Share on other sites More sharing options...
Prospeeder Posted January 26, 2006 Report Share Posted January 26, 2006 2000+ 3100 heads flow very well, they put out like 175-185 hp or so, and you cant forget they got Timed Injection, SFI Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted January 26, 2006 Report Share Posted January 26, 2006 http://www.60degreev6.com would be a better place to ask this question. Quote Link to comment Share on other sites More sharing options...
sl3196 Posted January 26, 2006 Report Share Posted January 26, 2006 What's with trying to send people to another site for info? Plenty of people know their shit here. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted January 26, 2006 Report Share Posted January 26, 2006 What's with trying to send people to another site for info? Plenty of people know their shit here. This topic isn't THAT technical to send them somewhere else... Anyways I noticed that my 3100 seems to have nice smooth torque all through the RPM band compared to older 3.1s (and especially my old 2.8 GP). Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 26, 2006 Report Share Posted January 26, 2006 i believe they are aimed for torque, as he 95 era 3100 only has 5 more ft/lbs of torque, but 20 more horses than the 3.1. Cool...but would you know exactly why the newer engine makes 20 more HP? what rpm does it do that as compared to the older 3.1? I know cam and head design can also contribute as well as a better flowing intake manifold.Was just wondering a bit more about the specs to get an idea how much of a difference the 2 had. The overall runner length....(plenum runner length + lower intake runner length) is more even on a 3100. Cyls 1,3,5 on a 3.1L have shorter overall runners...just look at the back of the plenum. The heads on a 3100 flow better....the exhaust especially, the ports are D-shaped. 3100 is a roller cam, 3.1L is a flat tappet. 3100 is SFI and has a ~9.6:1 CR and a 3.1L has like 8.8:1. Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted January 26, 2006 Report Share Posted January 26, 2006 What's with trying to send people to another site for info? Plenty of people know their shit here. This topic isn't THAT technical to send them somewhere else... I see you're point. I guess you're right... Quote Link to comment Share on other sites More sharing options...
1QUICKHATCH Posted January 31, 2006 Report Share Posted January 31, 2006 the higher HP is mostly due to the better flowing heads and intakes, but the roller cam helps alot too! Quote Link to comment Share on other sites More sharing options...
gp90se Posted January 31, 2006 Report Share Posted January 31, 2006 The runners/ports on a 3.1 plenum are pretty small where as the intake on a 3100 are a whole lot bigger. I just ported out my 3.1 plenum but have not driven the car with it yet but I can imagen it picking up a little more higher end HP. Quote Link to comment Share on other sites More sharing options...
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