Aluminum heads $ per HP?

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MOPAROFFICIAL said:
I know what you mean. It's just looking at it from the taillights.lol
A smaller compact chamber, plug in the right spot, will burn faster shorter flame travel. That means youll need less timing..add quench and its helpful re mix effect will speed that too with a more complete burn.Also with the faster burn...one would think there is lesser time for end gas or hotspots to light up an opposing flame front.. as well as dead spots from fuel fall out etc. The cooler faster dissipation of heat through the chambers counters the hotspot issue. Really.. more heat causes greater molecule expansion ..and they expand so much before heat induced self ignition. It gets much deeper and goes into all sorts of pitfalls of traditional chamber designs of the 60s
But it mostly revolves around pump gas, or maximization of its resistance. Run everything at 99% its capacity/tolerance and you'll make thee absolute most power, right .
When you look at a piston or a chamber and you see dark areas vs clean spotless areas...that's showing you where good mix is and burning vs fuel fall out/lean...however tight quench area show lean/clean too. There are some really good circle track articles and engine builder online I highly recommend people search and read, read, and read some more.
Really the smaller compact chamber design lends the bigger hand though.
Click to expand...
:thumbsup:
 
Another thing I can tell you is this;
When leaving the house on a summers morning, the engine might be at 70/80*. This engine has no choke. Instead I have a dash-mounted, dial-back, timing delay- box with a range of 15*. I have it set to be able to advance up to 6* or retard up to 9*. So when the engine is cold, I just add the 6 to the 14 and drive away. I travel about a mile to the hiway, then head 'er out about 15/20 minutes to work. I set my foot to 100kph/62mph and hold it there. About 2 miles out , the car starts to gain speed. Another mile and she may be doing 70 mph; enough that I have to reduce the throttle opening.
Now, the curious part; the coolant was up to normal about the time I hit 100kph. What happened between the 2 and 3 mile mark?
IDK, but I think the heads finally warmed up, lol.

AJ, my Ranger is the same way,warming up wise. Head warms up or oil thins out from warmth?
Thanks for your reply! I forgot I had your combo saved. Need to reread it. The part about having 125K on the engine is outstanding! Have the heads been "touched" since first installed? I could picture Roland Osborne doing an article on your combo; reminds of Don Dulmage(sp?) and his 440 Charger. Bob
 
Heat is horsepower and cast iron keeps the heat in the head better so iron heads make more HP all things being equal.
 
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