401 Intake

[killroy]

Besides Edelbrock, who makes a good Intake manifold for the 401? looking for the low end performance. :rolleyes:

[Joe H.]

Check out the AMX-files pages...there's probably a link in the 'links' section of this site.

[killroy]

went there, from what I saw,(I moved pretty quick) I don't have much choice. I'm staying away from the Torker, not enough low end.
So new question: what is the diferance between the SP2P and the performer intake from Edelbrock, if any?

[Ralph]

The SP2P was essentially a stock replacement but made of aluminum and with spread-bore bolt pattern. No significant design difference.

The Performer manifold, however, has larger runners and higher flow rating than either the SP2P or an OEM 4-bbl manifold.

P.S. I'm partial to the Holley Street Dominator for Jeep engines as opposed to muscle car AMC-types.

[killroy]

What's the RPM range on the Holley Street Dominator

[Stuka]

The dominator for AMC engines was designed for jeeps. Its not really a street rodder intake per say. It works from idle to 6500 rpm I believe.

If you can find one use it..wish I had one.

[Ralph]

The instructions say its effective range is from off-idle to 5500 rpm.

This language is kind of misleading, since the camshaft and valve train actually dictate rpm limits, whereas the carb and intake manifold must cope with these limits.

The Holley manifold has much narrower runners than the Edelbrock Performer. This would seem to act as to limit rpm range, but in fact it creates higher velocity and higher pressure of the air stream to each cylinder chamber. There's also less mass of the air in the manifold at any instance, which means that mass can be accelerated or decelerated more quickly than in a manifold with larger runners; this leads to better throttle response at low rpms.

Another thing I like about the Holley is that the runners are all laid out nice and flat, and someday I'm going to install fuel injectors on each one of them. TPIGuy had the same idea, but I couldn't talk him out of his preference for an Edelbrock Torker with those big hairy runners.

Here are some comparison pictures of the Edelbrock and Holley manifolds I have:

http://fs3.dotphoto.com/MemberImages/180113/i20D6BE12-C42A-440B-8970-A3884E16582C.jpg
http://fs3.dotphoto.com/MemberImages/180113/i61BDDD29-C97B-4078-9754-E85AFA9BB9B2.jpg
http://fs3.dotphoto.com/MemberImages/180113/i81219A29-4B8C-4488-96CA-217AC41FC2C9.jpg
http://fs3.dotphoto.com/MemberImages/180113/i7F0EF0D7-5A85-4704-A57A-E40750E98B34.jpg

[jeepbob]

The RB4 (edelbrock) works well on AMC motors, but unfortunatly is out of production. The narrow runners of the Holley will act to hinder rpm as engines work on drawing air thru the intake unless the engine has forced induction. As the cross section is smaller the resistance to flow is increased. The smaller intake ports will cause higher velocity speeds but as the intake is under a negative pressure will not give higher pressure readings. The shorter runners on the Holley will not give as much low end torque as the longer runners on the Performer.
All of this is kinda moot anyhow because if you have the right gears in the rig (non of those 2.72's) you will have more than enough low end torque for towing and wheeling and should be looking to improve the mid and upper end. AMC motors are not like SBC's and actually make low end power. Enough that when IHC was looking for a light duty motor to put in light duty trucks because they could not make enough 392's (there is a real torque monster) they choose the AMC 401.

[Brown Bear]

Isn't all of this moot anyhow considering the amount of air flow restriction you are going to get initially from the air cleaner assembly. I'd say with the limited amount of air you are going to be pulling through the snorkel, you're not going to notice any difference anyhow. One possible area that it may make a difference is during a long partial open throttle or during wide open throttle. And you really shouldn't use any sort of forced air induction or tunnel ram unless you are planning on being at WOT all the time. The different air speeds moving across the top of the carb with the different vehicle speeds would create an unstable and uncontrollable too-lean or too-rich mixture that would constantly change, and that can't be good.

[Stuka]

Well if your gona go with a cam/intake/carb and all that running the stock air cleaner is stupid idea...

Go out and spend 30 bucks on a 360 degree air filter so you can actually have a improvement in power.