My Road Trip Motor Progress
nicolas:
Quote from: Zach Gomulka on July 19, 2012, 13:19:34 pm
How many CC's are in those? Whats your target compression?
yes i want t know as well what CR you are aiming at, as the semi hemi heads that berg sold were set up for very low CR. what is the difference between these and semi hemi's anyway.
rick m:
These heads are heavily worked over by hand to remove all sharp edges and machined cuts. Valves are also unshrouded (alot). Will give a report on performance when the motor is back in. There are a lot of different combos. One motor I held a tight chamber and put a large step in the pistons. I like trying new combos.
RM
Joel Mohr:
DYNO IT!!! It's so funny that the majority of the nay-sayers have done little if ANY dyno work...I've been using this chamber design for over 12 years, and have built many, many motors with just the hemi cut, and I can tell you without any reservation that Gene had little idea what he uncovered. In my work with Semi-Hemi heads, Gene was using TOO LOW of compression ratios, and THAT is what makes them hard to tune. Without the "squish area" the fuel can ONLY be fired by the plug. With todays gas, spark control is the best way to control flame travel and combustion. "Deseilizing", or squishing the fuel only leads to hot spots and "accidental" firing. Hence, PING! With the Hemi chambers, I have seen MUCH more even burn patterns, and much more power with the same combos...OK, I'm done...
bilboa2:
my heads on joel mohr built 2386, 48 idf motor for my baja, 44 x 37 heads also "adjusted" by clyde. runs very strong. bill
rick m:
Johl,.....It is funny that I lost my way when building my recent motor. I had already also discovered the benefits and drivability of the hemi style chambers. I got fed up with how my motor was performing and took my motor down, redid my heads and now I know I will like it more. I ran the combo in my last little driver motor...94x69 (1915). Had 40mm Weber IDFs. I got as high as 33mpg with that motor with a 110 cam.
These heads work.
Rick M
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