as i said, i wasnt sure about all that info in the bottom half, it was just things iv'e read elswhere. also wasnt sure when which engine was avalible, but considering this is in a slant six section...i was guessing he was smart enough to read where he clicked before posting in it. and when i said devided i ment each runner totaly seperate from the other. no dividing wall in a joined runner (thank you for that word "runner", i was racking my brain trying to remember what it was called)
and if heat is good then why do they make such low thermostats, and why would drag cars run with ice on the engine and use "ice boxes" to cool there fuel before it hits carb. everything ive always heard says heat is bad...it expands everything, decreasing the amount of air and fuel achieved in each cylinder. not saying your wrong...thats just what ive heared elswere...id love to understand it better though if you have an explination to the contrary
I know you said you weren't sure,that is why I offered the info to correct you.
They make such low thermostats because of the enormous amount of heat generated from a full throttle pass down the 1/4,especially since most race motors are tuned "lean" for the most power,thus causing even more heat.Too much heat is a bad thing,but so is not enough heat.
Icing the intake is about having a cooler denser charge entering the engine for more power. Actually having heat in the manifold/cylinder helps atomize the fuel.
This is especially true with the slant six engine with its un-equal length runners.The 3-4 runners are the shortest and closest to the plenum/carb,and are know to run "rich" while 1-6 run "lean" and 2-5 are almost ideal because of this design. Therefore the heat helps expand and atomize the fuel entering the 3-4 runners,and help combat the fuel puddling that occurs when the motor/manifold are cold.
I dont see the point in separating the 3-4 runners,as I have said before they are separate,all the way to the plenum.Every other runner has an exhaust runner on either side of it,whereas the 3-4 only have the exhaust on the outside of them,and a nice pocket of air between the intake and exhaust manifold under the intake,it could be argued that they are already cooler than the other runners.But the point would be moot since the intake and exhaust are bolted together as an assembly then bolted to the cast iron head,which is a whole lot of heat transfer going on.
Back to runner 1-6,some have found the number 1 intake will run slightly more rich than number 6,because of the fan constantly blowing across it,causing to to be cooler than any of the other runners,once more confirming that heat is subjective;too much heat bad,too little heat bad.
Like I mentioned before check out slantsix.org for tons of info on the slant. To us over there the slant is a kind of sickness,or way of life. You have guys like Doug D.,Dan S.,Charlie S. ...too many to list with years of knowledge pertaining directly to the slant six,and even guys with tons of knowledge of fuel injection,forced induction,and general racing knowledge. You will get sound,factual info over there rather than the "here-say" that you will pick of from random people or self proclaimed "car experts".
