Holley Intake = HEAT SOAK?
Holley Intake = HEAT SOAK? It would make sense wouldn't it?? I remember the LT1 days of having to ice down the intake between runs so I didn't lose any power due to heat soak. Are we looking foward to this with the Holley intake?? I would think so. I would also think that the adverse effects of hot air would offset the possible gains from porting.
Josh
Josh
Re: Holley Intake = HEAT SOAK? Josh, did the LT1/LT4 intakes have engine coolant circulating through them? If so, that would contribute to heat soak. These aluminum intakes will definitely hold more heat, and will probably reduce us to ice-bag mongers at the track. Might hurt my bracket racing
Tony
Tony
Joined: Nov 2001
Posts: 34,632
Likes: 2,558
From: Schiller Park, ILL Member: #317
Re: Holley Intake = HEAT SOAK? We used the ice trick back in my L98 days. It worked pretty good. We found that just dumping ice water over the plenum was a quicker way then having to leave the bag on there. Either way, we sometimes saw as much as 2mph improvements by doing this on hot days...
Re: Holley Intake = HEAT SOAK? Hey, i have an idea, especially for you Tony.
Has anybody considered building a "Intake Cooler"???
Like an intercooler that cools the intake itself.
Maybe some kind of case built onto the intake itself to fill with ice??
Is this good, bad, or just a no-no??
Makes sense to me, tell me why it won't work.
Taco
Has anybody considered building a "Intake Cooler"???
Like an intercooler that cools the intake itself.
Maybe some kind of case built onto the intake itself to fill with ice??
Is this good, bad, or just a no-no??
Makes sense to me, tell me why it won't work.
Taco
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Re: Holley Intake = HEAT SOAK? Been thinking about this, bear with me....
The heat soak issue is really in the top end of the engine, NOT the mainfold.
How much heat can be transferred to air when the engine is sucking 700-800cfm? The answer is very little. How many "manifolds of air" per minute go thru the engine? Probably more than you think. So there is little time for a rise in temp.
The reason the ice bag trick works is that the cooling quickly goes throught the manifold (not that much mass AND aluminum is an excellent conductor of heat/cold) and goes to the cylinders and water in the passages.
So I think that while you can cool an engine effectively by placing ice on the manifold, I don't think there is a great change in ambient air temp from an AL to a nylon 66.
The only way to know is to run insturmented tests <img src="gr_stretch.gif" border="0">
The heat soak issue is really in the top end of the engine, NOT the mainfold.
How much heat can be transferred to air when the engine is sucking 700-800cfm? The answer is very little. How many "manifolds of air" per minute go thru the engine? Probably more than you think. So there is little time for a rise in temp.
The reason the ice bag trick works is that the cooling quickly goes throught the manifold (not that much mass AND aluminum is an excellent conductor of heat/cold) and goes to the cylinders and water in the passages.
So I think that while you can cool an engine effectively by placing ice on the manifold, I don't think there is a great change in ambient air temp from an AL to a nylon 66.
The only way to know is to run insturmented tests <img src="gr_stretch.gif" border="0">
TECH Addict
Joined: Nov 2001
Posts: 2,551
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From: St Louis, MO
Re: Holley Intake = HEAT SOAK? [quote]Originally posted by Nine Ball:
<strong>Josh, did the LT1/LT4 intakes have engine coolant circulating through them? If so, that would contribute to heat soak. These aluminum intakes will definitely hold more heat, and will probably reduce us to ice-bag mongers at the track. Might hurt my bracket racing
</strong><hr></blockquote>
LT1/LT4 intakes do not have coolant in them, but they do have hot oil under them.
Eric
<strong>Josh, did the LT1/LT4 intakes have engine coolant circulating through them? If so, that would contribute to heat soak. These aluminum intakes will definitely hold more heat, and will probably reduce us to ice-bag mongers at the track. Might hurt my bracket racing
</strong><hr></blockquote>
LT1/LT4 intakes do not have coolant in them, but they do have hot oil under them.
Eric
Re: Holley Intake = HEAT SOAK? What happened to COOL-CANS? The fuel
doesn't spend enough time in the intake
to be heated by the heat transfer of metal
to liquid (fuel)Either cool fuel or Air
Air is tough to cool Fuel is heavier and
should hold temperature change longer
+ deg <img src="gr_images/icons/mad.gif" border="0"> - deg <img src="gr_grin.gif" border="0">
doesn't spend enough time in the intake
to be heated by the heat transfer of metal
to liquid (fuel)Either cool fuel or Air
Air is tough to cool Fuel is heavier and
should hold temperature change longer
+ deg <img src="gr_images/icons/mad.gif" border="0"> - deg <img src="gr_grin.gif" border="0">