Gain 100HP with an intake manifold change?? - Cross post from Ferrari Chat
#61
Nordschleife Master
Well TerryGT stock GT, with MSDS header put down 352RWHP with a rich tune (12:1) (orignially 290rwhp).
Cheb with 5.4L a compression bump, and M5 itbs sees 438RWHP.
Yours should see a substantial bump....
Cheb with 5.4L a compression bump, and M5 itbs sees 438RWHP.
Yours should see a substantial bump....
#62
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Fuse 24 Assassin
Rennlist Member
Mark,
Intake: Lift .437" duration @.050" 230
Exhaust: lift .437" duration @.050" 228
LSA 114.
Springs can be changed with engine in the car.
Use a leak down tester to pressure up the cylinder, this hold the valves up allowing you to remove and install the valve springs.
GT is
Intake: lift .393" duration @.050" 211
Exhaust: lift .353" duration @.050" 200
Intake: Lift .437" duration @.050" 230
Exhaust: lift .437" duration @.050" 228
LSA 114.
Springs can be changed with engine in the car.
Use a leak down tester to pressure up the cylinder, this hold the valves up allowing you to remove and install the valve springs.
GT is
Intake: lift .393" duration @.050" 211
Exhaust: lift .353" duration @.050" 200
Is this normal procedure for changing valve springs without pulling heads?? I seriously had never thought about this before.
#64
Nordschleife Master
Valve springs, guides & seals.
Easy as anything on a Chev small block.
#65
Rainman
Rennlist Member
Rennlist Member
I've been hanging out in the LS1Tech forums lately, and those guys just throw gas at everything, regardless of forced induction or naturally aspirated and keep making power. I'm sorry, but a new intake HAS to happen for these cars to make more power. If I have to grovel to the wife for the new product, I will.
944 DOHC manifolds bolt up to 928 head.
Here is a 944S2 manifold bolted to a 928S3 head.
#67
Rainman
Rennlist Member
Rennlist Member
I think in this case, whatever fits under a 944 hood will fit in a 928
Obviously the engine parts locations are different but...
A 2-v 928 spider intake would stick above the 944 hood almost 10 inches, if bolted to the 944 head.
Obviously the engine parts locations are different but...
A 2-v 928 spider intake would stick above the 944 hood almost 10 inches, if bolted to the 944 head.
#68
Rennlist Member
im game!
the pressure keeps the valve up flush and there are tools to remove the keepers and put them back on. OR, you can stuff some rubber hose down the hole and then put the piston back up toward TDC to put pressure on the valve to hold it in place. i gues as long as yor rotating the engine to TDC on each cylinder, the valve cant drop very far if you are using the compression tester fitting and compressed air.
#69
Captain Obvious
Super User
Super User
Mark,
Intake: Lift .437" duration @.050" 230
Exhaust: lift .437" duration @.050" 228
LSA 114.
Springs can be changed with engine in the car.
Use a leak down tester to pressure up the cylinder, this hold the valves up allowing you to remove and install the valve springs.
GT is
Intake: lift .393" duration @.050" 211
Exhaust: lift .353" duration @.050" 200
Intake: Lift .437" duration @.050" 230
Exhaust: lift .437" duration @.050" 228
LSA 114.
Springs can be changed with engine in the car.
Use a leak down tester to pressure up the cylinder, this hold the valves up allowing you to remove and install the valve springs.
GT is
Intake: lift .393" duration @.050" 211
Exhaust: lift .353" duration @.050" 200
#70
Captain Obvious
Super User
Super User
It's an old mechanics trick and so is feeding rope down the cylinder. I've done it both ways. Compressed air is more elegant, the rope method is safer (in case you loose air pressure) and gives you more room (nothing sticks out of the spark plug hole).
#71
Captain Obvious
Super User
Super User
Well if it's just that simple, why don't you get your hand dirty and make one. Then report back.
#72
Rennlist Member
Oh, but how about i will......... I dont have the abilities or patience to build something as intricate as an intake. ive seen the work of others here and this, not only has been done by others, but can be done much better than i would ever be able to do.
Its not a matter of "hands" dirty, its a matter of abilities, knowledge and skill.
so, if someone builds it, i will buy it and test it.
I just cant believe someone hasnt built one yet. its the MOST common modification of most all marquees, yet, we dont have a product. the closest thing was the CF intake, but incorporated a little too many custom/ (home depot) parts.
#74
Rennlist Member
I would be game to do that as well!
I dont know why this isnt a more positive and popular discussion. heck putting a custom intake on a blown motor is more of a silly build, as you can just turn up the boost to make up for losses in the stock intake. .
im thinking there should be a pretty easy way to get an intake on the 928S4.
if it means chopping up a couple of S2 intakes, that would be a cheap and easy start with parts that fit our heads naturally. then, the only challenge is doing some aluminum welding of a box, fitting some nice inlets to them and putting them in a place under the hood that fits the stock MAF and an aftermarket TB.
I dont think this is impossible, or should take hundreds of hours as Greg B's intake did....BUT, i bet this can be made from near existing parts... maybe the intake runners and air box from another car also made from aluminum so it can be merged together. dont know, but there are lots of possibilities.
I dont know why this isnt a more positive and popular discussion. heck putting a custom intake on a blown motor is more of a silly build, as you can just turn up the boost to make up for losses in the stock intake. .
im thinking there should be a pretty easy way to get an intake on the 928S4.
if it means chopping up a couple of S2 intakes, that would be a cheap and easy start with parts that fit our heads naturally. then, the only challenge is doing some aluminum welding of a box, fitting some nice inlets to them and putting them in a place under the hood that fits the stock MAF and an aftermarket TB.
I dont think this is impossible, or should take hundreds of hours as Greg B's intake did....BUT, i bet this can be made from near existing parts... maybe the intake runners and air box from another car also made from aluminum so it can be merged together. dont know, but there are lots of possibilities.
#75
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Fuse 24 Assassin
Rennlist Member
You definitely need to read good books on volumetric efficiency, runner length and flow when it comes to the construction of an intake.
By no means am I an expert in this, but I do believe runner length and tapering may have a lot to do with how Greg was able to create the gains he did with his setup. Hell, with any setup this is imperative to have knowledge on.
By no means am I an expert in this, but I do believe runner length and tapering may have a lot to do with how Greg was able to create the gains he did with his setup. Hell, with any setup this is imperative to have knowledge on.