I was waiting to hear mean effective torque and flame propagation and all that nerdiness lol. I remember hearing OEMs put a lot of effort into getting quench right as it has a huge impact on exhaust pollution emissions also. The Otto cycle engine never ceases to amaze.
Mr Steve Morris, thank you. I raced 2 valve 4cyl turbo dodge engines years ago. They had a 1.6 intake/1.4ex valve. The only way to make HP was massive intake pressure 30+ psi. Lots of chamber heat. Lots of "glow plugs" in the chamber causing broken pistons. Made an open chamber 1/4 inch to coolant. Unreasonable piston breakage went away, tuning window became huge. No one would believe me. Now, it is accepted. Thank You Sir.
In the two stroke world we call it a squish band, it must be properly cut into the head for the engine to produce top power without detonation. Typical MX engines and Roadrace engines have different combustion chamber shapes and geometry. Yamaha developed a head combustion shape for roadrace engines so they wouldn’t blowup on long straights at 16,000 rpm.
Mr Morris says exactly what I found in highly boosted engines. If you can't make the quench work perfectly, or if the casting is too thick causing a hot-spot, grind it away
Wow thanks Steve. I'm trying to build a 460 in my garage. Looks like someone's been in it. All the bearings are wiped and put small groves on the crank. And the oil pump looks aftermarket so I'm thinking maybe the oil pump went out. Maybe I can get away this wet sanding the crank with 1500 grit and new oil pump. But the motor ran good at 75 psi.
We call that area "squish." Because it "squishes" the fuel charge into a the burn measurably. In my 2-stroke engines squish is everything. I cut the heads squish area 3*. at .028. from the outer wall, growing the further towards the center. The squish velocity was measured to be optimal this way with flat top pistons. I also tried custom dome pistons that were also 3* keeping it unchanged through the squish area. I ended up changing the .028 to .032. This motor set 12 set land speed records at El Mirage. These were all 2 strokes race engines though. I am sharing this with you in the hope you can find something you can use on your motors. I have been a subscriber of yours for many years ,since you were working out of your first shop. I just bought a 632 motor to run N/A. The heads are junk. Rock bottom AFR Enforcers. I am going through cancer treatment so money is a bit tight. I no longer have my shop. "Grand Prix Racing of Corona Ca.' Do you have a good used set to sell? I have a beautiful 67 El Camino, I 4-linked. We reduced the weight of the car significantly. The car dynoed 930hp. I want to run mid 8.0s but I don't the HP to carry it. Cheers, to you, an amazing innovator. Steve S.
Great vids Steve. Can you do a short vid on the clutch setup on the dyno. I know you said it had a flex plate with a spring. Can we get a look at that setup?
I was waiting to hear mean effective torque and flame propagation and all that nerdiness lol. I remember hearing OEMs put a lot of effort into getting quench right as it has a huge impact on exhaust pollution emissions also. The Otto cycle engine never ceases to amaze.
I'm soo glad I found your channel! Your info you are passing on is invaluable! Especially for a at home engine guy! Keep the tech coming!
Mr Steve Morris, thank you. I raced 2 valve 4cyl turbo dodge engines years ago. They had a 1.6 intake/1.4ex valve. The only way to make HP was massive intake pressure 30+ psi. Lots of chamber heat. Lots of "glow plugs" in the chamber causing broken pistons. Made an open chamber 1/4 inch to coolant. Unreasonable piston breakage went away, tuning window became huge. No one would believe me. Now, it is accepted. Thank You Sir.
Guy grabs a head probably worth more than my short block to draw a picture on 😂. Steve’s a G
Never heard of quench, freaking cool!! Thank you for making me a little smarter
Thanks for all the great Steve Tech videos
man I learned so much more than i thought i knew and i really understand now, thanks for this
Wonderfully explained as always.
Cool videos Steve!!
Appreciate the cool tips. I may not be putting engines together all the time but good knowledge any how.
In the two stroke world we call it a squish band, it must be properly cut into the head for the engine to produce top power without detonation. Typical MX engines and Roadrace engines have different combustion chamber shapes and geometry. Yamaha developed a head combustion shape for roadrace engines so they wouldn’t blowup on long straights at 16,000 rpm.
Great content thanks for sharing, very informative
Thanks for taking the time to share 👍
Mr Morris says exactly what I found in highly boosted engines. If you can't make the quench work perfectly, or if the casting is too thick causing a hot-spot, grind it away
You the man....dig all videos
Awesome info as usual
That’s the way It was explained to me in mid 90’s stage 2 boosted v6 Buick engine head porter David Wink rip . Thanks Steve
Wow thanks Steve. I'm trying to build a 460 in my garage. Looks like someone's been in it. All the bearings are wiped and put small groves on the crank. And the oil pump looks aftermarket so I'm thinking maybe the oil pump went out. Maybe I can get away this wet sanding the crank with 1500 grit and new oil pump. But the motor ran good at 75 psi.
We call that area "squish." Because it "squishes" the fuel charge into a the burn measurably. In my 2-stroke engines squish is everything. I cut the heads squish area 3*. at .028. from the outer wall, growing the further towards the center. The squish velocity was measured to be optimal this way with flat top pistons. I also tried custom dome pistons that were also 3* keeping it unchanged through the squish area. I ended up changing the .028 to .032. This motor set 12 set land speed records at El Mirage. These were all 2 strokes race engines though. I am sharing this with you in the hope you can find something you can use on your motors. I have been a subscriber of yours for many years ,since you were working out of your first shop. I just bought a 632 motor to run N/A. The heads are junk. Rock bottom AFR Enforcers. I am going through cancer treatment so money is a bit tight. I no longer have my shop. "Grand Prix Racing of Corona Ca.' Do you have a good used set to sell? I have a beautiful 67 El Camino, I 4-linked. We reduced the weight of the car significantly. The car dynoed 930hp. I want to run mid 8.0s but I don't the HP to carry it. Cheers, to you, an amazing innovator. Steve S.
Great vids Steve. Can you do a short vid on the clutch setup on the dyno. I know you said it had a flex plate with a spring. Can we get a look at that setup?