Anyone using grumpys modified plenum. how is the performance

 

:lurk:

 

I think this should be stated as... "Anyone other than Grumpy using Grumpy's plenum box to fit on top of the holley stealthram base under the C4 hood with a 350ci engine."


[Modified by scorp508, 9:40 PM 10/21/2003]

 

LoL

I there is 2 or 3 other guys who bought it, but I cant remember reading they got everything up and running.

 

I was one of those guys. I have it here and ran that set-up for a very very short time. I have taken that motor apart however, to bore it out for more displacement(396). I have since decided to go in a completely different and radical direction tho and won't be using it. Will send ya a message.

 

Paul what's the story with your Vette? How is it coming along and what radical direction are you going in? :D ;)

 

what is a "grumpy's modified plenum"?

 

http://fasterdeals.com/vette/index.html

 

So, How did you like the setup when you were running it?

 

Do a search. There are only unhappy people that own this POS. Hood hitting the T-body, blown engines and major distribution problems are the major comments.


No one has been able to get a motor to run using the junk plenum.

 

How does the plenum cause a blown engine? If by distribution problems you mean the distributor not sitting at the proper height (saw this on 3rdgen.org), again how does the plenum cause this?

 

I am curious how a plenum, no matter how bad the design could cause problems. I think that guy was confusing the Modified stealth ram with the LT1 intake conversion.

The Stealthram lower intake manifold is cast just like any intake for a normal SBC (non LT1), so it already has the distributor hole and the added fuel injector holes.

I think it is a great setup due to the tunnel-ram effect and still longer than LT1 and Miniram runner sizes, and would love to try it on my car also, only thing stopping me from it is the fact they are not emissions legal (no EGR).

If they would only cost a bit less, considering a superram setup can be had for slightly more, which is the only emissions legal intake that has proven itself time and time again.

 

It is very obvious that this guy wants everyone to buy the other intake. He says he has proof that Grumpy's intake doesn't work but I have yet to see any. I agree with MrNUKE. It is impossible for the plenum to blow the engine.
I don't believe the distribution statement either. Unless the intake is machined incorrectly where the throttle body bolts on and causes the throttle plates to stick wide open. This would blow the engine for sure. I doubt this is the case with Grumpy's product though. My guess is just some mud slinging from the competition!
John

 

Why?

You could end up with a very lean cylinder and weld a piston to the cylinder wall.

 

anybody tried milling down the stock plenum so it will clear the hood or is there enough material to do this.

 

The only people who should discredit this intake are the people who actually USED one and had problems as a result of it.

So will the real Grumpy intake user please stand up?

 

quote:
--------------------------------------------------------------------------------
It is impossible for the plenum to blow the engine.
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Why?

You could end up with a very lean cylinder and weld a piston to the cylinder wall.
________________________________________ ________________________

Could a plenum alone lean out a cylinder? If I understand correctly, each injector is allowing the same amount of fuel into each cylinder (theoretically). To lean out a cylinder so much that you stick it the injector would have to: a. fail to allow enough fuel into the cylinder, or b. somehow more air than normal would have to enter the cylinder. My guess is the plenum might cause slight differences in how each cylinder burns due to air flow within it but that's it. I guess what I'm saying is as long as the engines injectors are working properly the cylinder is only going to draw in as much air as it is designed to unless air is forced in via a turbo or supercharger. A plenum's just not gonna do that.

I'm not taking sides, just trying to make sure the playing field is level.

Of course, I could be completely wrong. :seeya


[Modified by loiq, 10:18 PM 10/29/2003]


[Modified by loiq, 10:21 PM 10/29/2003]

 

:iagree: I can't see how a plenum would cause a engine to blow up! Maybe a poorly designed plenum may cause you some HP but in a EFI and NA application I really can't see it possible. I have a tunnel ram that I'm considering converting,I will fabricate the plenum myself, and if I blow the motor the last place I'd look would be the plenum design. I'd have to almost block off some cylinders or something of the sort to actually make it blow up (because it was too lean) and even then the cylinder may be too rich before it's too lean if my injectors are working properly. I don't know what the whole story is but it sounds more like "playa hating" than a poor plenum design. We need to hear from some users of the plenum. Just my .02

 

In my opinion Blownvette has zero credibility on this topic. The whole thing started because someone accused someone else of copying a design and trying to market it first. When the mudslinging started, Blownvette was CONTINUALLY asked to post WHY Grumpy's plenum would fail. But it became some kind of Cloak and Dagger crap revolving around IM's and phone calls. Just post it or shut up.

Was it Beachbum that tried this intake awhile back but couldn't get it to mate with the heads? Blownvette blamed that on the plenum too. Now I'm no rocket scientist, but come on!

I don't know either of these individuals, this is just what I gather from following the plenum saga from the beginning.


[Modified by flyersfan1088, 6:09 PM 10/29/2003]

 

sounds like this intake system is not being used on the corrvette because of the plenum design, but picked up interest by summits catiloge saying it would fit a corvette.................which is wrong and the lastest addition notes it will not clear a corvette hood.....................still you can buy it polished and I'm mildly interested.................which part of the plenum hits the hood, could you shave the manafold and plenum top and bottom to get the clearence. or is it just easier to buy a superram, miniram?

anyone out there with some experiance running this manafold? :cheers: :cheers: