Questions. #1 What pistons are you running and do you know what the piston angle dome is? #2 What was the deck height set at? #3 What was the static compression ratio? IMHO, I would send out the heads to get chamfered to the corresponding angle of the piston, that way you have a better quench.
The piston are original I didn’t split the case and change them from factory. Unfortunately I don’t know the angle. The heads are brand new with valves and springs. And the seats were cut with the proper angles. I just had to shim them. I have to still run a compression test when I bring the engine outside to test start it.
Nothing beats fresh heads… I didn’t know AA performance made 912 heads. That is great to know…. What is that groove in the pump cover? Is that worn into it from a cooling tin?
Yeah my local machine shop told me about them and gave them a shot based on the cost. The valve springs need to be shimmed though, they don’t come built in. Are you talking about that circle groove seen before putting the cover on? There is a tin piece that covers half the cover that goes under the crank pulley that I didn’t install in the video yet.
@@ilias8010 yes, that groove on mine is almost all the way through the cover. I wasn’t sure if this was a groove worn in with time, or there from the factory
It looked like to me something that was from the factory when they casted the case. There only thing that moves are the gears, nothing on the out side that would “cut” that groove.
Well done
Questions.
#1 What pistons are you running and do you know what the piston angle dome is?
#2 What was the deck height set at?
#3 What was the static compression ratio?
IMHO, I would send out the heads to get chamfered to the corresponding angle of the piston, that way you have a better quench.
The piston are original I didn’t split the case and change them from factory. Unfortunately I don’t know the angle.
The heads are brand new with valves and springs. And the seats were cut with the proper angles. I just had to shim them.
I have to still run a compression test when I bring the engine outside to test start it.
Nice and very satisfying I can imagine. But, hold on, is your oil drain plug screw on upside down? Hex on inside of motor?
I’m not quite sure what you mean, the drain plug hex is on the outside. Simply put it’s like a large bolt. They don’t have a magnet on it though.
Nothing beats fresh heads… I didn’t know AA performance made 912 heads. That is great to know…. What is that groove in the pump cover? Is that worn into it from a cooling tin?
Yeah my local machine shop told me about them and gave them a shot based on the cost. The valve springs need to be shimmed though, they don’t come built in. Are you talking about that circle groove seen before putting the cover on? There is a tin piece that covers half the cover that goes under the crank pulley that I didn’t install in the video yet.
@@ilias8010 yes, that groove on mine is almost all the way through the cover. I wasn’t sure if this was a groove worn in with time, or there from the factory
It looked like to me something that was from the factory when they casted the case. There only thing that moves are the gears, nothing on the out side that would “cut” that groove.