Black Mamba Jr. vs Sr.

[mrstealthrttt]

https://cloneenginepartsonline.com/t/cylinder-head-and-related-parts is were i got the head from def makes a difference. @ sandiego 26 pound springs. But if i new ole4 was and or had heads id woulda probaly picked one up from him a very helpful guy

 

[ole4]

Cloneengine parts is where I used to get the 18cc Honda style symmetrical heads but he no longer sells them bare. He does a good job selling heads with bigger seats installed for diy guys up to fully done ones.

 

[riverjohn]

Ole, why does my Honda 18 head milled 050 with 27/24 valves, #37 springs, outperform
my Honda 22 head milled 075 with 28/25 valves, #26 springs? Seems it would be the opposite.

Mikuni 24, mamba jr

 

[ole4]

No idea, maybe compression or maybe the 18cc head outflows the bigger valve head. Is valve job equal on both? Could valve seal be suspect? How are you measuring the power difference?

 

[riverjohn]

Thanks, Ole.Both heads from nr racing. RPM's increase noticeably faster under a load and the motor just sounds
sharper/better with the 18. I surmise it's a matter of quench, flow, or other aspect I have little
knowledge of, but after using the 22 with the bigger valves for a long time, I was astonished to pick
up so much performance with the 18. Live and learn!