It's cool to see someone doing something with these. Have you thought of blocking the water passage across the bottom of the intake? I always wanted to try a carburetor or two on top a custom top plate, you know of anybody that's ever done that? The lower intake on a 96-99 350 vortec truck engine is almost identical to a crossfire.
My first build was a 2000 vortec truck actually lol. The biggest problem with those from what I recall is having the injector assembly inside the plenum. It otherwise had a decent port to work with. For the water passage, I had thought of cutting back and welding it. The issue then becomes you cant really drop the floor of the runner with its original shape and maintain a good shot at the intake port... basically it would be flat. The renegade solves this by still having a tapper. While not impossible to do, the flow present in the manifold at its current state is adequate for the current engine, pending my welder finishing up the tweaks. As far as someone running a carb, I think you would have to space the lid higher. The fuel already has a tendency to slam into the floor trying to make the turn on the lid that I think adding a carb would make it worse especially at transient throttle. I know someone did hack one up for a blower but, I don't think I have seen a carb on a CFI intake.
Thought there was a mod were you could use a better ecm with this engine, supposedly the oem computer wasn't fast enough to handle performance modifications.
@@ratherbeboating10 Used to see them once in a while. Hopefully they will get the tooling to a reputable mfg. Then again, I'm still waiting for the new Blackberry phone from Onward Mobility, so you can't go by me.
@@ratherbeboating10 Yeah, I don't imagine there will be a whole lot of money in it for anybody. Not sure how many crossfires are still on the road and what the demand would be.
@@1984C4Corvette_DIY_Garage Apparently enough. He's selling a lot of EBL ecms converted to run on the CFI harness. There are a lot of third gens out there still with it.
you mention a few times a 1205 and 1206 gasket. What are they from or which are you refering to? I am in the middle of porting one and was just going to get the standard crossfire gaskets for my 1984 vette. Is there a better set to use?
My aftermarket heads are matched to a 1205 felpro gasket but should run a 1206. The stock crossfire heads are about the size of the stock gasket and is what I would run on a stock engine as it has the flow restriction on the rear coolant port and provisions for an egr passage. A 1205 and the stock gasket are about the same size. I would have no issues running a stock gasket on my old setup. The stock one is perfectly fine to use imo. So go with it. 👍
I need to do this on my 82 intake. Renegades are impossible to find. Should I try my hand at grinding it? I mean idk if a shop would do a job like this
I’ve ported a few CFI manifolds. Just take your time. It will only be as good as the amount of time you want to take on it, and how far you want to go. Very good gains though.
@@Joesmusclecargarage Yeah. The original owner of DCS has the tooling in his hands but finding a foundry that will cast it and at a reasonable unit cost is keeping him from pulling the trigger. Upwards of 2k per is just unreasonable. He is curious how my rig will run with this though. He said and I quote: it has to be better than what's on there. I'm feeding what should be a roughly 400hp mill with a stock unit so I have to agree with him on that.
It does and doesn't. On the flow bench it does flow less uncorked but the flow distribution between runners... the standard deviation, is pretty tight.
These crossram intakes aren't worth the effort, your best bet is to ditch the 2x1bbl tbi units and just use a 2bbl. truck tbi unit with a conventual dual plane intake. Tbi systems don't run the greatest with long runners, 90* turns into ports, and large plenums.
@@Joesmusclecargarage I'm going to hang onto it for right now, I lost the hardware for the top plate and I may have also damaged the lid testing something... So it may not be a viable solution at all at the moment.
@@Joesmusclecargarage Fair enough. I'd be worried about the top plate if it did actually warp. I'm on thirdgen and corvette forum. That's probably easier for me to reach out from, I no longer have access to the email associated with this account for some reason. I will for sure keep in touch depending what I do... and if I ever get my ported unit back from my welder.
Love that people still enjoy the Crossfire! Always my favorite set up!
I have fun... or enjoy punishing myself lol
It's cool to see someone doing something with these. Have you thought of blocking the water passage across the bottom of the intake? I always wanted to try a carburetor or two on top a custom top plate, you know of anybody that's ever done that? The lower intake on a 96-99 350 vortec truck engine is almost identical to a crossfire.
My first build was a 2000 vortec truck actually lol. The biggest problem with those from what I recall is having the injector assembly inside the plenum. It otherwise had a decent port to work with.
For the water passage, I had thought of cutting back and welding it. The issue then becomes you cant really drop the floor of the runner with its original shape and maintain a good shot at the intake port... basically it would be flat. The renegade solves this by still having a tapper. While not impossible to do, the flow present in the manifold at its current state is adequate for the current engine, pending my welder finishing up the tweaks.
As far as someone running a carb, I think you would have to space the lid higher. The fuel already has a tendency to slam into the floor trying to make the turn on the lid that I think adding a carb would make it worse especially at transient throttle. I know someone did hack one up for a blower but, I don't think I have seen a carb on a CFI intake.
Right on! Can’t wait for an update
If you want to polish fit go up to 2000 2500 grit until it's really smooth
You don’t want a smooth mirror finish. That will reduce fuel atomization.
Thought there was a mod were you could use a better ecm with this engine, supposedly the oem computer wasn't fast enough to handle performance modifications.
Already done. You can use a 7747 or ebl flash if you repin the harness.
I always swap my CFI cars to an 8746, and utilize an IAT.
Been really thinking about this. Mainly because I read so many bad things about trying to find a decent renegade.
You actually can't find any at all since the tooling was pulled. Last I checked the stocks all are gone. So at this point this is the only option.
@@ratherbeboating10 Used to see them once in a while. Hopefully they will get the tooling to a reputable mfg. Then again, I'm still waiting for the new Blackberry phone from Onward Mobility, so you can't go by me.
@@1984C4Corvette_DIY_Garage As of right now, there is no foundry. Tom reconditioned the tooling and it is ready to go should someone want to do it.
@@ratherbeboating10 Yeah, I don't imagine there will be a whole lot of money in it for anybody. Not sure how many crossfires are still on the road and what the demand would be.
@@1984C4Corvette_DIY_Garage Apparently enough. He's selling a lot of EBL ecms converted to run on the CFI harness. There are a lot of third gens out there still with it.
Stupid question does anyone know if any good machine shop can port a crossfire stock manifold? Renegades are no where to be found. Thanks in advance
No one I asked was willing hence doing it myself.
you mention a few times a 1205 and 1206 gasket. What are they from or which are you refering to? I am in the middle of porting one and was just going to get the standard crossfire gaskets for my 1984 vette. Is there a better set to use?
My aftermarket heads are matched to a 1205 felpro gasket but should run a 1206. The stock crossfire heads are about the size of the stock gasket and is what I would run on a stock engine as it has the flow restriction on the rear coolant port and provisions for an egr passage. A 1205 and the stock gasket are about the same size. I would have no issues running a stock gasket on my old setup. The stock one is perfectly fine to use imo. So go with it. 👍
@@ratherbeboating10 thanks, other than some exhaust work the engine is stock. exactly the answer I was looking for.
@@blackbirdbill yeah then no reason not to use a stock one. It's a good gasket and iirc is still a felpro.
i remember you from crossfire forum
Funny enough, crossfire vault was before my time. I got access to the site just as it went offline so I never interacted with anyone over there.
Anyone have a renagade intake they will sell?
I need to do this on my 82 intake. Renegades are impossible to find. Should I try my hand at grinding it? I mean idk if a shop would do a job like this
I'm hoping to have an AB dyno test done so I can see what it did. It isn't terribly hard if you just take your time.
I’ve ported a few CFI manifolds. Just take your time. It will only be as good as the amount of time you want to take on it, and how far you want to go. Very good gains though.
@@Joesmusclecargarage on a scale of good to bad... how did I do lol.
@@ratherbeboating10 Looks good to me! You’re on the right track. 👍
@@Joesmusclecargarage Yeah. The original owner of DCS has the tooling in his hands but finding a foundry that will cast it and at a reasonable unit cost is keeping him from pulling the trigger. Upwards of 2k per is just unreasonable. He is curious how my rig will run with this though. He said and I quote: it has to be better than what's on there.
I'm feeding what should be a roughly 400hp mill with a stock unit so I have to agree with him on that.
I never realized the stock intake had holes crossing over to the adjacent runners. That must cause a lot of turbulence.
It does and doesn't. On the flow bench it does flow less uncorked but the flow distribution between runners... the standard deviation, is pretty tight.
These crossram intakes aren't worth the effort, your best bet is to ditch the 2x1bbl tbi units and just use a 2bbl. truck tbi unit with a conventual dual plane intake. Tbi systems don't run the greatest with long runners, 90* turns into ports, and large plenums.
I put 360 to the tire on a mustang dyno with a stock bottom end... that's good enough for me for now lol.
Would you be willing g to sell the renegade?
I would, but it still won't seal into the lifter valley and you'd then have a massive vacuum leak so would you really want it?
@@Joesmusclecargarage I'm going to hang onto it for right now, I lost the hardware for the top plate and I may have also damaged the lid testing something... So it may not be a viable solution at all at the moment.
@@Joesmusclecargarage Fair enough. I'd be worried about the top plate if it did actually warp. I'm on thirdgen and corvette forum. That's probably easier for me to reach out from, I no longer have access to the email associated with this account for some reason. I will for sure keep in touch depending what I do... and if I ever get my ported unit back from my welder.
I have a brand new one for sale.