1G Evo 3 Intake Manifold on 1g head.

[El Cuervo]

Hey guys what's up? Yeah I'm curious about it. I already done some slight research on it and I do know that the runners on the 1g have a bigger diameter than the Evo 3 and the 2g manifolds. This is to match the head ports and such.

Installing a 1g mani on a 2g head won't work because this will create turbulence from going to bigger diameter to small diameter without a smooth transition. On the other hand, its the opposite with the 1g. Going from a small diameter to a large one. There is no turbulence as there isn't a wall effect blocking the air.

So why do I want to know if the Evo 3 or even the 2g intake mani would fit the 1g head? Simple. More low end torque and maybe quicker response. The 1g IM is great for mid range power and for what it seems it can't be beat for that.

So I would like to know if an Evo 3 or a 2g IM would yield more HP or TQ at a lower rpm than the 1g, considering that those 2 manifolds have smaller ID runners thus increasing air velocity to the engine?

 

[concept4g63]

Stick with the 1gs mani. The cyclone ones are good

 

[FLASH1970]

The 2g and EVO 3 head have different intake ports that are more of a straight shot into the combustion chamber. So the air has more velocity and doesn't neeed the big ports. The 1g head is setup different and the air doesn't have as much velocity, but more volume on its way to the combustion chamber. So putting an evo 3 intake on a 1g head would probably rob power. Just get a SMIM, Cyclone, or stick with the stock 1g IM.

 

[romeen]

The Cyclone IM gives you the best of both worlds. The key is to get it working the way Mitsubishi intended it to work by having it activate at a set rpm point. But it can take a bit of time and patience to get it mounted since you may have to relocate a few things (coil, PT), etc.

 

[El Cuervo]

Yeah. That's right about the cyclone mani. I have been thinking about the cyclone manifold but for what I read in the past, it starts to fall short at mid to upper range. Maybe someone with more experience on it can say. I'm Curious about the evo3 manifold and I'd would like to see how it would perform on a 1g head. So anyways, Please, let's stay away from the "just stay with your 1g manifold" comments. I. Already know the potential of the 1g manifold and where it stands.
Anyhow, so is it logical to try to compare the evo3 intake runners with the cyclone longer small I.D runners? These small runners are what helps with low end power. I'm assuming that the evo3 runners could fall somewhere in between the cyclone small runners and the 1g mani runners. Also, the evo3 I'm has a bigger plenum which can help with increasing the power band. Some people have reported that there is a power loss in lower and mid rpms when compared to the 2g IM. of course, this is on a 2g head and compared with the 2g IM. So that's why I'm asking. I would like to know if there is any power advantage at any rpm over the stock 1g? Btw, I already know what intake mani to go if I choose to discard the 1g.

The 2g and EVO 3 head have different intake ports that are more of a straight shot into the combustion chamber. So the air has more velocity and doesn't neeed the big ports. The 1g head is setup different and the air doesn't have as much velocity, but more volume on its way to the combustion chamber. So putting an evo 3 intake on a 1g head would probably rob power. Just get a SMIM, Cyclone, or stick with the stock 1g IM.

Thanks for the response though I am fully aware of the difference between both heads.
So tell me then, if you say that the 1g head wouldn't bebefit from the evo3 manifold (I'm assuming that you say this not onlu because of the head port design but also because of the runner I.d size and such) then why does the 1g head benefit from the smaller inlet diameter runners of the cyclone manifold? These small runners are made to increase velocity not air volume, yet the 1g head does see an increas of low end power when only these runners are active. So yes, even the 1g big port head benefits from small high velocity runners. Maybe not as much as the 2g head but it still does.

 

[talonDSMerr]

Yes, going from larger i.d. runners to smaller intake head ports creates velocity reducing turbulence because of the wall the air is ramming into. However, the same is true when you go from the small i.d. runners of 2g and evo3 intake manifolds to the larger intake ports of the 1g head. You would think the air would continue to flow straight into the head, but when the i.d. increases abruptly when the runners meet the head, airflow actually turns around the corner and slams into the walls of the intake port. Pairing an evo3 manifold to a 1g head would actually hurt flow. The cyclone is proof that the 1g head benefits from smaller runners, but the design of the runners means they match the 1g head, keeping airflow laminar with high velocity all the way to the cylinder.

 

[El Cuervo]

So in order to eliminate this effect, the evo3 intake mani would need to somehow have the runners opened up or remove the flange and weld a 1g flange and make a smooth teansition from evo size runners to the 1g runners/flange.

 

[talonDSMerr]

Yes, you can do that. Or you could also pair the evo3 manifold with a 2g head with no porting necessary. If you are set on the 1g head and want more low rpm torque, I would find a cyclone and extrude hone it for better flow up top.

 

[El Cuervo]

Well this would be more like an experiment thing with the evo 3 intake. It would be very nice if it really makes more power than the 1g at low and high rpms.Besides, its something that nobody has tried or at least that I know of.
I do want to get a cyclone but trying to get it properly set up can be a bi***. I would like to see tests done between the 1g and cyclone manis. I also been contemplating on getting a hogan or venom IM. The hogan seems to give more low end than the 1g and the venom more top end.

 

[talonDSMerr]

If you have the means to experiment with the evo3 intake and 1g head, I say go for it. Results always trump theory and could open up another viable option.

Setting up the cyclone isn't too hard, and consists only installing a couple vacuum lines and brackets for relocating the coil pack. Dialing in the rpm where the cyclone opens its valves involves doing one pull with the valves shut throughout the rpm band, and one pull with the valves open throughout the rpm band. The point at which the torque curves cross is where the cyclone should be actuated for maximum results.

Low-end torque + quick spool + nearly the flow of 1g manifold top-end is a combo that's pretty hard to beat.

 

[El Cuervo]

Yes, you a. re right. We need more IM options. Well there are quite a few IMs but they don't perform as well as the stocker. I still can't find any data between the 1g mani and the jmf manifold. Nor is there a jmf vs magnus. It seems like neither of these 2 companies are posting any form of flow chart vs the 1g IM. I wonder why? According to this test: DSM Support - Mitsubishi Eclipse - Eagle Talon - Plymouth Laser - DSM Help Guide and to my personal opinion, the only IMs that displayed an advantage over the 1g IM were the hogan and the venom IMs. The hogan in low end, the 1g in mid and the venom in top end power. Ahh if only it was possible to combine these 3 IMs. . So thats why I was asking about the evo 3 IM. Some people that have the cyclone working right are not very happy with it. Maybe extrude hone the cyclone IM but leave the small runners untouch?

 

[rich3389]

If you put a evo3 IM on a 1g head, the flange on the evo3 mani wont even make a seal on the 1g head...

 

[pboglio]

EVO3 intake manifold is extremely close to not working with the 1g intake manifold gasket, which is usually oversize compared to the actual intake port size. Its been done already. I'd suggest a very thick phenolic spacer about 1" thick for a 2g, then port match and blend for the 1g head. Only way I see this working cleanly. The EVO3 intake manifold actually has a very small plenum, and small diameter runners, but the short length of the runners boosts the topend. Anyone saying you loose midrange torque with an EVO3 intake manifold must have had something wrong, cause I gained everywhere except below 3000 rpms, and above 6000 rpms the gains are big.

 

[El Cuervo]

pboglio. Thanks. So do you know of someone running the evo3 IM on a 1g? If so, what did they have to say about it??
thanks.