deciding on a intake for a sbm weiand stealth or air gap
- Thread starter kevins67
- Start date
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Are we supposed to magically know the rest of your combo or what it's goin in?
LOL, tell me about it.
OK, here's some thoughts on the intakes. Both are excellent intakes. Others will come on here and split hairs between them and then trash the other. The differance between them that I have noted besides the no kidding air-gap/ non air-gap space is a small manifold height differance.
The Weiand has:
A heat cross over
Larger ports
You can carve it out for a TQ or just save money and get the otherwise identical Action Plus.
The RPM A-G has a nicer swooping smoother runner but a smaller port window. This ad's velocity to the air/fuel charge. This is important for most motors but not a end all.
Resident champion racer "Locomotion' use's a Weiand on his class racer. I forget the class. I think it Create motor class.
He runs a create 360 with a Weiand on top because (as he will tell you himself) it is the better intake for "His combo."
Personaly, while the intake is an overall part of the combo, either intake will perform really well, combo dependent. Now the question is, in addition to RustyRatRods is, do you need everylast 10th? Or are you in the street just buzzing around?
Please tell us about your engine combo and the rest of the cars stuff that it is equipped with.
OK, here's some thoughts on the intakes. Both are excellent intakes. Others will come on here and split hairs between them and then trash the other. The differance between them that I have noted besides the no kidding air-gap/ non air-gap space is a small manifold height differance.
The Weiand has:
A heat cross over
Larger ports
You can carve it out for a TQ or just save money and get the otherwise identical Action Plus.
The RPM A-G has a nicer swooping smoother runner but a smaller port window. This ad's velocity to the air/fuel charge. This is important for most motors but not a end all.
Resident champion racer "Locomotion' use's a Weiand on his class racer. I forget the class. I think it Create motor class.
He runs a create 360 with a Weiand on top because (as he will tell you himself) it is the better intake for "His combo."
Personaly, while the intake is an overall part of the combo, either intake will perform really well, combo dependent. Now the question is, in addition to RustyRatRods is, do you need everylast 10th? Or are you in the street just buzzing around?
Please tell us about your engine combo and the rest of the cars stuff that it is equipped with.
DaveBonds
Garage Trash
Agreed.
If this is a street car that has no heating or cooling issues, you've only got two questions to ask yourself, with a corresponding answer;
- Will this engine be used in 40°F or lower weather or do you have exhaust manifolds? - If so, use the Weiand.
- Will this engine be used in 90°F or higher weather or do you have headers? - If so, use the Edelbrock.
If this is a street car that has no heating or cooling issues, you've only got two questions to ask yourself, with a corresponding answer;
- Will this engine be used in 40°F or lower weather or do you have exhaust manifolds? - If so, use the Weiand.
- Will this engine be used in 90°F or higher weather or do you have headers? - If so, use the Edelbrock.
Fisher
Old Guy with a Cool car.
My engine builder has had experience with both. He is not a big fan of Wiend intakes.
johnnycuda
JohnnyCuda's 68
Yeah I like the LD340 myself.
DaveBonds
Garage Trash
For what it's worth, the LD340 and LD4B are essentially the same exact design as the Weiand Stealth/ Action Plus, with the LD340 runner sequences reversed.
I compared a Weiand Action Plus to an LD4B, which are nearly carbon copies of each other, and discovered that the Weiand had much better quality casting, inside and out and the runners were slightly longer, giving the Weiand a little more height overall.
They are all good intakes and on a street car, will essentially perform the same, but the air gap is designed for cooling, so keep that in mind. Cooling is usually a good thing in high performance applications, but can hurt some applications with fuel puddling and fallout, due to intake temps that can get really low, if it's going to see lower temps. Intakes do need some heat to help atomize fuel for good economy and complete combustion, for good performance. Too much is as bad as having too little, so the reason to get an air gap would be from testing under hood temps to see if the car and how it's built, will benefit from one.
I'd buy an air gap if I was experiencing fuel temp issues that couldn't be resolved or under hood heat temps on an infa-red thermometer that couldn't be resolved.
I compared a Weiand Action Plus to an LD4B, which are nearly carbon copies of each other, and discovered that the Weiand had much better quality casting, inside and out and the runners were slightly longer, giving the Weiand a little more height overall.
They are all good intakes and on a street car, will essentially perform the same, but the air gap is designed for cooling, so keep that in mind. Cooling is usually a good thing in high performance applications, but can hurt some applications with fuel puddling and fallout, due to intake temps that can get really low, if it's going to see lower temps. Intakes do need some heat to help atomize fuel for good economy and complete combustion, for good performance. Too much is as bad as having too little, so the reason to get an air gap would be from testing under hood temps to see if the car and how it's built, will benefit from one.
I'd buy an air gap if I was experiencing fuel temp issues that couldn't be resolved or under hood heat temps on an infa-red thermometer that couldn't be resolved.
Alright guys here's my setup! I had a cam thread to which I did explain my setup! Rusty rat rod! 360 stock cast crank eagle rods bored 0.30 over kb flat tops 9:5:1 comp maybe higher 360 J heads torqer 2 intake 600 cfm Eder och being changed to a 670 street avenger it has he'd man headers with 1 5/8 primarys and a comp xe 256 cam with non adjustable rockers
Note I will be upgrading a few things down the road like the cam and valve train the car is a 67 dart with a built 727 and a 2500 stall car weighs 3000lbs
Note I will be upgrading a few things down the road like the cam and valve train the car is a 67 dart with a built 727 and a 2500 stall car weighs 3000lbs
Stealth,my choice. Intake plenum heat,,helps the velocity/boundary layer,on the intake tract....
not intending to start a argument or something similar just intrested in the part in bold,i have noticed that those two manifolds looks identical except for the carbpad but have quite different rated powerbands is there any confirmation on them actualy beeing the same except for by the eye?
im considering one of these intakes for something i want to develop into sort of a factory apearing stroker 340 with a rollercam. intending to make it a sleeperthingy.;)
No coil mount provision on the stealth/action plus/ld4b.
69B-Cuda
Well-Known Member
I have a stealth on my barracuda (360) with no issues.... have an air-gap RPM on my wife's 68 Mustang and it is very cold blooded even in the summer (sits all winter) and really doesn't run right till it warms up for 10-15 minutes or so....
Locomotion
Well-Known Member
I would say that they are close enough to where you should get the one you can get the best deal on.
DaveBonds
Garage Trash
Yes sir-ee.
They wanted it gone. The intake is a bad place for electrical mounting.
This works great for the coil, on the staggered bracket, on an A body, with stock wires-
There is a step on the firewall, right by the wiring branch that works great, sits up, next to the distributor with enough room to reach the hold down bracket bolt. I also got the wiring harness off of the valve covers and up on to some home brew brackets that share spark plug wire separators.
Go with the Weiand. Even in the summer, you won't see temps high enough on a regular, to need an air gap, unless you've got unwrapped headers and a low CFM rated fan, pulling air through the radiator, like a flex fan, slipping clutch fan or electric fan without a complete shroud.
I have not compared them side by side.
I disagree with the Weiand to be used with exhaust manifold and not headers.
I disagree with the RPM not to be used with exhaust manifolds. This thinking demotes both intakes in there capabilities and there flexabilities. Either intake can be used effectively in any application. (One may out shine the other. This is application & purpose dependent.)
I own a RPM A-G and a LD340. Between the two, application dependent and if used in a similar mild/medium powered engine, there is no real differance between them to argue about. The diff. Is the RPM doesn't like the cold and will take a while to warm up if at all in the cold.
The heated LD works year round without issue and losses a little HP on hot days.
The heat cross over in a intake is best used in a flexable double duty car and blocked when max power is sought from the intake. The heat cross over is not a detriment to performance in many if not most cases. Then Again, if your racing it, LOL, are you really concerned about drivability?
DaveBonds
Garage Trash
Both are great intakes. I've seen both on header and exhaust manifold applications, but I think the A G is more performance oriented and it's added design element doesn't do much to benefit the user on a car with manifolds, even though it will work in most typical uses.
I definitely agree that the difference in performance isn't even measurable in most cases. The AG being cold blooded and the Weiand giving more fuel economy when they are pushed to the uses for their design benefactors.
If I was building something to bracket on the weekend competitively, I'd go for the Edelbrock and a set of wrapped headers to keep it cool and keep under hood temps down for better air charge and scavenging. If I wanted more fuel economy and practicality on a street car, I'd go exhaust manifolds to save my headaches around bumps and dips and for lower temps and keep the crossover for atomization. If fuel vapor lock or coking became an issue, I'd space the carb or run a TQ or Street Demon on the Weiand.
I still think the Weiand is a better street manifold for Michigan. If it were down south, I'd pick the other.
I definitely agree that the difference in performance isn't even measurable in most cases. The AG being cold blooded and the Weiand giving more fuel economy when they are pushed to the uses for their design benefactors.
If I was building something to bracket on the weekend competitively, I'd go for the Edelbrock and a set of wrapped headers to keep it cool and keep under hood temps down for better air charge and scavenging. If I wanted more fuel economy and practicality on a street car, I'd go exhaust manifolds to save my headaches around bumps and dips and for lower temps and keep the crossover for atomization. If fuel vapor lock or coking became an issue, I'd space the carb or run a TQ or Street Demon on the Weiand.
I still think the Weiand is a better street manifold for Michigan. If it were down south, I'd pick the other.
No mater the intake up top, well tuned and a proper combo go far. Not to be rude but I think the thinking is flawed. I point to the F.A.S.T class with a stock intake running mad times as an example.
Camshaft scan handle the restrictive exhaust manifold issue followed by exhaust pipe size. The intakes ability for ingesting is all it does and it doesn't worry about how the engine breaths out.
Camshaft scan handle the restrictive exhaust manifold issue followed by exhaust pipe size. The intakes ability for ingesting is all it does and it doesn't worry about how the engine breaths out.
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