Cylinder heads

94snake · 03-06-2003, 04:36 PM

is their a performance difference between iron and aluminum heads other than the fact of aluminum being lighter and able to dissipate heat better?

NotchJohnson · 03-06-2003, 04:38 PM

You can run slightly more compression with aluminum heads without detonation.

capri351w · 03-06-2003, 05:27 PM

aluminum heads are better in many ways generaly they have much better port designs because they dont have to be limited by the water jacket as they do in factory cast iron heads not to mention the heat transfer aspect that is why you have to run higher compression with aluminum heads because it makes for a cooler more dense cylinder charge which actually drops cylinder pressure

Murdock · 03-06-2003, 09:16 PM

The only real performance difference is that aluminum heads are lighter. It's really a toss-up of which is better...loosing weight or loosing heat in the cylinder.

Ideal, you want as much as a cold intake charge as you can get going into the cylinder...stuff as much air in there as possible. However, once the intake valve closes...if you could create as much heat and compression as possible...and keep it all in the cylinder you would see some pretty wild cylinder pressure.

Think of it this way...if you throw an aerosol can on the ground..it does nothing

, but if you throw it in a fire...it takes off

Murdock

03-06-2003, 04:36 PM	#1
94snake Registered Member Join Date: Nov 2002 Location: Panama City Fl. Posts: 152	Cylinder heads is their a performance difference between iron and aluminum heads other than the fact of aluminum being lighter and able to dissipate heat better?

03-06-2003, 04:38 PM	#2
NotchJohnson Registered Member Join Date: Oct 2001 Location: Florida Keys Posts: 593	You can run slightly more compression with aluminum heads without detonation. __________________ 89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.

03-06-2003, 05:27 PM	#3
capri351w Registered Member Join Date: Feb 2003 Location: Winder Ga Posts: 6	aluminum heads aluminum heads are better in many ways generaly they have much better port designs because they dont have to be limited by the water jacket as they do in factory cast iron heads not to mention the heat transfer aspect that is why you have to run higher compression with aluminum heads because it makes for a cooler more dense cylinder charge which actually drops cylinder pressure

03-06-2003, 09:16 PM	#4
Murdock Registered Member Join Date: Dec 2002 Location: Columbus, OH Posts: 100	The only real performance difference is that aluminum heads are lighter. It's really a toss-up of which is better...loosing weight or loosing heat in the cylinder. Ideal, you want as much as a cold intake charge as you can get going into the cylinder...stuff as much air in there as possible. However, once the intake valve closes...if you could create as much heat and compression as possible...and keep it all in the cylinder you would see some pretty wild cylinder pressure. Think of it this way...if you throw an aerosol can on the ground..it does nothing , but if you throw it in a fire...it takes off Murdock __________________ LARZRACECARS larzracecars.com

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