Newest Cmb .45

[Danny King]

This is the nicest engine I have seen from Cmb yet. The finish of the case and sleeve are closer to a nova then any of the Cmb engines. Didn’t run it stock. Modded it up amd will run it it this way. Same level mods as the evo I’ve been running.

 

[ALLAN YUEN]

Great will bet than RS Evo gold head or M-Line red head
who work modded??

 

[Shane Bastick]

Totally agree on the finish of the new 45 GPX, some of the best internals on a CMB, the new GPX liner sets CMB have released look really good as well

 

[Danny King]

Great will bet than RS Evo gold head or M-Line red head
who work modded??

It could be better. It has something’s that are a improvement. But the evo runs awesome already. Time will tell. I mod all my own engines.

 

[Danny King]

First time at the lake

 

[Danny King]

Video is too long I suppose.

 

[Brandon White]

Just curious what does cutting the water jacket shorter do??

 

[Danny King]

The cooling design stock is a 2 chamber system. In a rigger the lower cooling isn’t needed.
And instead of leaving the lower part of the ring in place I remove it. 1 reason is then any residual water isn’t trapped and it allows the heat to escape rather then be trapped.

 

[SayMikey]

Does Stu have them in quantity?

 

[FloridaScaleBoater]

Danny,
Do you think the S/M carbs make a difference?

 

[Danny King]

Does Stu have them in quantity?

stu isn’t carrying the m line.

 

[Danny King]

Danny,
Do you think the S/M carbs make a difference?

The bigger bore yes. The swirl cut not much if any. More of a mental advantage. Lol

 

[SayMikey]

I thought Brad had the 67 version

 

[Danny King]

I thought Brad had the 67 version

Brad is the chosen one.

 

[Timbo Whalen]

I thought Brad had the 67 version

Out on a limb here, but don't think CMB offers the RS EVO in 11cc (inc M-line & GPX).
I've got a new, never fired 67 RS dual plug.

 

[David Bryant]

Danny,
Do you think the S/M carbs make a difference?

The bigger bore yes. The swirl cut not much if any. More of a mental advantage. Lol

I would think the SpeedMaster carbs are a cleaner, more simplistic design (made to suit our form of sprint/heat racing). I prefer to use an aftermarket carb, and keep the OEM part original if possible.

 

[SayMikey]

Out on a limb here, but don't think CMB offers the RS EVO in 11cc (inc M-line & GPX).
I've got a new, never fired 67 RS dual plug. Brad is there Beta tester View attachment 308094

 

[ids987]

Out on a limb here, but don't think CMB offers the RS EVO in 11cc (inc M-line & GPX).
I've got a new, never fired 67 RS dual plug. View attachment 308094

As far as I know, that’s a gold head .67 Evo; from the same era as the .45 and .90 gold head Evo. Those came before the purple head Evos. After the purple head Evo, came the .45RS and .91RS (red headed). I don’t think the .67 ever made it to RS. They stopped making double bobbin crank .67s; after the .67 purple head Evo. From then on, the .67 and .80 were only available in the “HR” line.

 

[Danny King]

As far as I know, that’s a gold head .67 Evo; from the same era as the .45 and .90 gold head Evo. Those came before the purple head Evos. After the purple head Evo, came the .45RS and .91RS (red headed). I don’t think the .67 ever made it to RS. They stopped making double bobbin crank .67s; after the .67 purple head Evo. From then on, the .67 and .80 were only available in the “HR” line.

Yeah there is a bit of sarcasm running around this thread. And wishful thinking. You are right. But they knew the answer too. Thanks for the info.

 

[Timbo Whalen]

I would think the SpeedMaster carbs are a cleaner, more simplistic design (made to suit our form of sprint/heat racing). I prefer to use an aftermarket carb, and keep the OEM part original if possible.

Yes, Dave, those Speedmaster carbs are nice, and Harry is just an awesome guy to deal with.

The OEM carb barrel's function on 2 axis mechanics, whereas the SM's are simply rotational.

As Danny had alluded to somewhere, the ones with the rifled ID do not show any power or speed benefit. In theory, one would think it would compact the charge mixture and prevent drop out. Who knows, maybe a Dyno would show a difference.

I did notice a performance differential between SM and OEM on the NR46DD. The NR DD's seem to prefer the stock design carb bore ID in an out of the box engine vs. big bore. Perhaps relative to a more complex, longer charge path.

Finally, the SM carb allows greater packaging within the hull/tub itself, including push rod envelope. That's especially noticable given these narrower outrigger tub widths.