New 2 stroke piston design. ESR CEO

BobPA
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BobPA 12/30/2018 9:51pm
12/30/2018 9:51pm
BobPA wrote:
[img]https://p.vitalmx.com/photos/forums/2018/12/30/314332/s1200_CF11E10C_4B0E_4F9A_A538_9257C202D7FF.jpg[/img]

DJS721 wrote:
Loop charge, cross flows, inverted domes, all different names for the same basic idea... [img]https://p.vitalmx.com/photos/forums/2018/12/30/314337/s1200_Piston1.jpg[/img]
Loop charge, cross flows, inverted domes, all different names for the same basic idea...



My old man has "Loopers Beware, Crossflow Country" written above his workbench. I bet you can guess he raced OMC's back in the day...
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DJS721
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DJS721 12/31/2018 3:40am
12/31/2018 3:40am
BobPA wrote:
[img]https://p.vitalmx.com/photos/forums/2018/12/30/314332/s1200_CF11E10C_4B0E_4F9A_A538_9257C202D7FF.jpg[/img]

DJS721 wrote:
Loop charge, cross flows, inverted domes, all different names for the same basic idea... [img]https://p.vitalmx.com/photos/forums/2018/12/30/314337/s1200_Piston1.jpg[/img]
Loop charge, cross flows, inverted domes, all different names for the same basic idea...



BobPA wrote:
My old man has "Loopers Beware, Crossflow Country" written above his workbench. I bet you can guess he raced OMC's back in the day...
This guy was an Evinrude Speedy Twin man....



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Lasse
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Lasse 12/31/2018 5:35am
12/31/2018 5:35am
There's a guy on youtube experimenting with eliminating the wristpin, eliminating flow through there.

Also a new design of pistonring, that allows for a MUCH wider exhaust port.
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Neverclear
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Neverclear 12/31/2018 7:43am
12/31/2018 7:43am Edited Date/Time 12/31/2018 7:44am
goinrcn44h wrote:
ESR has been around forever from the micro sprint days in the 90s. We were taking CR250s and bore and stroking them on methanol . Clutch...
ESR has been around forever from the micro sprint days in the 90s. We were taking CR250s and bore and stroking them on methanol . Clutch gone, power valves gone, huge pipes and replaceable domes and a host of other shit. Was getting close to 90 HP out of a 270cc honda engine. They still race them back east.
It's all in the squish... ( post piston to dome clearance)
BobPA wrote:
This. My neighbor, across the street, has a wall full of melted pistons from his old 270. Methanol sure makes power...but those dirt track boys sure...
This. My neighbor, across the street, has a wall full of melted pistons from his old 270. Methanol sure makes power...but those dirt track boys sure do scatter a bunch of engines.
No kidding. The 2 seasons my son drove my Micro at Hamlin & Kutztown produced a ton of carnage.



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SDTony YZ ESR 325 2/12/2019 6:47am
2/12/2019 6:47am
Yamaha are you listening?

http://www.eddie-sanders-racing.com/category_s/126.htm


YZ325.CEO.CYLINDER.KIT

Our Price: $930.00


NEW PISTON AND HEAD DESIGN
SHOP CELL 805-440-1063
COMES WITH THE FOLLOWING
CYLINDER POWER VALVE
PISTON CEO
HEAD CEO RACE FUEL NEEDED
GASKETS NUTS BOLTS
ONLY ONE PORT AVAILABLE DOES ALL
Capturing Efficiency Optimized = CEO
The C.E.O is a revolutionary design to the modern 2stroke motor. The design has been worked on, developed and redesigned many times since the 80’s when ESR first tested it.
Don’t understand it? Well here is a quick laymen’s description of what’s going on.
On a 2 stroke during the up stroke fresh fuel/air is pushed out the exhaust. It’s the expansion chambers job to push that fresh charge back into the combustion chamber. This is where matching the pipe to the porting is so important. With the C.E.O. dished piston top, instead of pushing that fresh charge out the exhaust it forces it into the center of the piston. This is optimizing the efficiency of your fuel/air charge when it’s “off the pipe” allowing the motor to still run optimal even when your not in the Goldilocks zone of the pipe and porting matching perfect. This drastically broadens the powerband, and truly turns your bigbore kit into the “4 stroke killer”
PATENT IS APPLIED FOR # 13523.02 SIERRA IP LAW PC
Stuntman949
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Stuntman949 2/12/2019 7:32am
2/12/2019 7:32am
Your seat looks much better SDTony!!!

Any footage of the 325 in action? Possibly some GoPro onboard
SDTony YZ ESR 325 2/12/2019 9:06pm
2/12/2019 9:06pm
Stuntman949 wrote:
Your seat looks much better SDTony!!!

Any footage of the 325 in action? Possibly some GoPro onboard
Thanks, lol! So your the guy who gave me a hard time? Yes it looks better after I had the fabric guy tighten it up. I don't have any gopro action, maybe after I cover my daughter's college I could get one in 2-3 years from now.

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