Vac45 blue head VS Vac45 V-5

[FloridaScaleBoater]

Are the parts interchangeable?
Is it just the piston & sleeve that are different or is the crank different also.
TIA
Rick

 

[P THOMAS]

V5 OK in blue head, jusst match the case with the exhaust ports

 

[FloridaScaleBoater]

V5 OK in blue head, jusst match the case with the exhaust ports

Gotcha, the V5 has the eye brows on either side correct?
Cranks are the same? No advantage to the V5 crank.

 

[Jeff Lutz]

Gotcha, the V5 has the eye brows on either side correct?
Cranks are the same? No advantage to the V5 crank.

The latest V5 cranks have some added plates for a balancing attempt. Most people are still having them rebalanced. I have one here I’m about to pull down and work on Ill know more about it soon. Jeff

 

[Bradley Maglinger]

The newest style cranks only has room for one slug, after I got my new one slugged, I compared it vs the double slugged crank from Bouchie, the Bouchie crank still weighed a bit more but they are very close. In my 40 hydro I am currently running the new crank with it slugged from Kent Ballard and I have had zero failures, he does great work.

 

[Terry Keeley]

The older style crank balanced about 26% of the piston, rod and wrist pin, the new bolt on counterweight balances about 33%.

I didn't notice a difference in the boat.

 

[David Bryant]

The older style crank balanced about 26% of the piston, rod and wrist pin, the new bolt on counterweight balances about 33%.

I didn't notice a difference in the boat.

interesting, thanks!

 

[David Bryant]

Curious, how does the CMB .45 V-5 compare to the current .45 RS EVO, and .45 M-Line engines? No comparison? Close in performance?

 

[timwhalen]

Curious, how does the CMB .45 V-5 compare to the current .45 RS EVO, and .45 M-Line engines? No comparison? Close in performance?

The V5 supposedly has more torque, due to the under square bore/stroke ratio. However, theory can be somewhat deceiving.
I have run all 3 of the combinations mentioned in the same D Hydro.
What we found is the RS EVO platform can swing more prop.
Could this be due to the higher rotating mass, hence greater inertia, with the RS EVO platform?... that's what we tend to think.
We did add 2 looper window ports to the V5 (stock timing) in an effort to get more fuel per cycle into the chamber, and it seems to have increased torque significantly.
But, we need to test more with the bigger 2200 and 2300 series ABC's to comment further. Strut depth also plays a significant role, too

 

[Brian Schymik]

I have run the v5, evo , and 45 blue head cmbs also in the same d hydro. The v5 and the blue head have very similar results- same props, sane speed, But the EVo is faster, throws the same props with no sag and launchs better. I think it is superior. Same results in my sport40
Brian

 

[David Bryant]

I have run the v5, evo , and 45 blue head cmbs also in the same d hydro.

interesting thanks. When you say “45 Blue head”, you’re referring to the original CMB .45 VAC models?