Holley Manifold Testing- TEASER SHOT

[Hoblick]

reading on the holley site, it says it comes with the fuel rail kit. any insight on that. is it a kit to fit stock fuel rails, or are they supplying new fuel rails?

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[UPRSteve]

reading on the holley site, it says it comes with the fuel rail kit. any insight on that. is it a kit to fit stock fuel rails, or are they supplying new fuel rails?

They provide new rails but sadly that is all I can say right now.

 

[rozay]

They provide new rails but sadly that is all I can say right now.

Nice

 

[yellowstangatl]

Any idea on when they're gonna release the story?

 

[Brian@Vossen]

Subd for this one

 

[BrazukaV8]

Sub'd

 

[Schu]

Aluminum heat soak?

 

[redline727]

Aluminum heat soak?

I am pretty sure aluminum isn't any worse than composite when it comes to heat. I thought it was for cost/weight when composite is used. Aluminum probably isn't even if that much heavier than composite either.

Think about it like this, ever put aluminum foil in the oven and notice it doesn't really get that hot and even if it does it dissipates the heat very quickly? You can usually grab aluminum foil out of the oven with your bare hands.

Not a science major, just something I noticed and figured may apply...

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[Grimace427]

Think about it like this, ever put aluminum foil in the oven and notice it doesn't really get that hot and even if it does it dissipates the heat very quickly? You can usually grab aluminum foil out of the oven with your bare hands.

The lack of mass of the foil is mostly responsible for that. Put the entire roll of aluminum foil in the oven for long enough and try to pull it out with your bare hand, you will likely burn your hands. Same goes for a hunk of aluminum in the shape of a manifold.

 

[redline727]

The lack of mass of the foil is mostly responsible for that. Put the entire roll of aluminum foil in the oven for long enough and try to pull it out with your bare hand, you will likely burn your hands. Same goes for a hunk of aluminum in the shape of a manifold.

Yup, I'm sure that would make a difference. Good point haha, that's why I said I'm not a science major haha.

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[Evolvd]

The lack of mass of the foil is mostly responsible for that. Put the entire roll of aluminum foil in the oven for long enough and try to pull it out with your bare hand, you will likely burn your hands. Same goes for a hunk of aluminum in the shape of a manifold.

This is incorrect, aluminum is conductive, not convective. It allows heat to pass through it as it has a high specific heat. A mass of aluminum will retain some heat but not nearly as much as steel or iron. Other than weight savings this is why we no longer have cast iron heads...and in many cases blocks.

The aluminum foil in the oven is a good example and putting the whole roll won't change the results. In fact most of the heat you would feel in it is from the air trapped in the roll.

Better test, take a bare aluminum cooking sheet and put in the oven. It won't hold nearly as much heat as a ceramic or glass cooking plate. Most of the heat you initially feel is actually the thin layer of air that surrounds the metal.

But, all that being said, you did say "for long enough" and any material will get hot if you leave it in "for long enough".

 

[ifly680g]

This is incorrect, aluminum is conductive, not convective. It allows heat to pass through it as it has a high specific heat. A mass of aluminum will retain some heat but not nearly as much as steel or iron. Other than weight savings this is why we no longer have cast iron heads...and in many cases blocks.

The aluminum foil in the oven is a good example and putting the whole roll won't change the results. In fact most of the heat you would feel in it is from the air trapped in the roll.

Better test, take a bare aluminum cooking sheet and put in the oven. It won't hold nearly as much heat as a ceramic or glass cooking plate. Most of the heat you initially feel is actually the thin layer of air that surrounds the metal.

But, all that being said, you did say "for long enough" and any material will get hot if you leave it in "for long enough".

Just a fun test!

I put an anodized aluminum pan and a cast iron pan and heated both on the stove to approx 250F after 5 minutes the aluminum pan was 142 and the cast iron pan was 151 as measured with a ThermoWorks IR gun.

I did remove both from the heat and placed them on a cool part of the stove. The only variable was that the cast iron pan was not as thick as the aluminum pan.

After 10 minutes Aluminum was 107 cast iron was 98

So to me it looks like they cool down close to the same rate or the increased mass of the aluminum pan did have an effect.

I'm no test engineer so tell me what went wrong with this test.

 

[Evolvd]

You have two variables but also have two "noise" variables (noise is uncontrolled) as in the mass of both objects and that one has a coating on it. If you wanted to do a properly engineered test you'd need bare metal, of equal mass, and the test would need to be noise free.

But, you can simply avoid all that, and just google what you quoted me on.

 

[Grimace427]

This is incorrect, aluminum is conductive, not convective. It allows heat to pass through it as it has a high specific heat. A mass of aluminum will retain some heat but not nearly as much as steel or iron. Other than weight savings this is why we no longer have cast iron heads...and in many cases blocks.

The aluminum foil in the oven is a good example and putting the whole roll won't change the results. In fact most of the heat you would feel in it is from the air trapped in the roll.

Better test, take a bare aluminum cooking sheet and put in the oven. It won't hold nearly as much heat as a ceramic or glass cooking plate. Most of the heat you initially feel is actually the thin layer of air that surrounds the metal.

But, all that being said, you did say "for long enough" and any material will get hot if you leave it in "for long enough".

I'm a little confused why you mentioned convective? Of course aluminum(an most if not all metals for that matter) are conductive. Convection is the process of transferring heat by means of a fluid(like the engine's cooling system, with the engine being mostly aluminum anyway).

The mass of the material is directly related to the amount of heat that can be transferred. The very small mass of aluminum foil will only be able to absorb so much heat and will release it very quickly(through thermal radiation IIRC) before your hands touch it. Throw a large chunk of aluminum like a manifold in the same oven at the same temperature and allow it to equal the temperature of the oven, any attempt to grab it with your bare hand will burn you.

Place two identically sized intake manifolds in the oven, one being aluminum and the other iron, the aluminum will transfer its absorbed heat into the atmosphere quicker than the iron manifold as you correctly mentioned. That iron manifold, however, has much more mass than the aluminum.

 

[Viperbluecobra]

So we are saying aluminum is better than iron for this application. But is it better than plastic composite? I don't think so.

I'd say the aluminum one is going to last longer, from heat and cool down cycles over the years, but for the benefit of heat soak and dissipating heat, the plastic one has to be better.

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