pipe for Mac .21 in speedmaster

[anthony scardina]

So I've got a speedmaster with a Mac .21 and an m445 prop (was told by the original owner that this was the best prop he'd had on the boat), not sure what pipe to buy now. I know the old standby .21 pipe is the 3280, but I've also heard the novarossi pipe is good as well as a cmb. Not sure which models of nova (muffled or standard?) Or cmb pipes are worth getting?

The novarossi standard pipe costs a bit less than a 3280, but the muffled one is more and the carbon one is more yet. Any suggestions are greatly appreciated at this point.

 

[P THOMAS]

Those are good pipes also if you can find one a silver andybrown muffeled pipe or a 21 cooper pipe is good 7 1/2 to 8 inches long. That will have to be a strong Mac 21 to pull that M445 you better line up a x437/3 or at the most a x440/3.

 

[Steven Bryant]

CMB Valvola pipe works really well on the MAC engine turning a X440/3 or a X442. M445 is just a bit too much prop in my opinion....

 

[anthony scardina]

I can try those props too...this was Cliff Zeek's boat and that's what he had recommended.

 

[P THOMAS]

I can try those props too...this was Cliff Zeek's boat and that's what he had recommended.

Well try it it may like it , if it setup for that prop

 

[shoboat]

Anthony,

I can give you a nova rossi nitro pipe if you would like?

I have one just sitting here brand new. Never worked well

for my set up. Shoot me your address and I will put it in the

Mail tomorrow. I have a cooper 21 also? But it is not free.

Thanks,

Mark Sholund

231-590-3023

 

[dave roach]

The new 21 cmb nitro pipe works real will on a mac.Stu Barr has them.

Dave

 

[julianconde]

OPS 3280 is a very very good pipr for the Mac 21 X437 and AB pitched up X440 will work great

 

[anthony scardina]

I'm also wondering if anyone makes a header that would bring the pipe up a bit, it hits the radio box with the current setup, not an issue I'd have had with a front exhaust. Looking for something similar to this one from novarossi

 

[dave roach]

Anthony

Mac pipes make a header with a up swing that mite work for you.

Dave

 

[Andy Brown]

I'm also wondering if anyone makes a header that would bring the pipe up a bit, it hits the radio box with the current setup, not an issue I'd have had with a front exhaust. Looking for something similar to this one from novarossi

header.png

I think we still have 15 or 18 degree headers for the MAC 21.

Our MAC 21 powered mono always ran best with the X437/3 and pipe at 7 3/8".

 

[anthony scardina]

I was advised by the guy I got the boat from to try using a seaducer radio box since they're lower profile, so that's my current project. I'm pretty sure I have x440 and x437 in both two and three blade variants, so plenty of props to try this spring!

 

[P THOMAS]

I was advised by the guy I got the boat from to try using a seaducer radio box since they're lower profile, so that's my current project. I'm pretty sure I have x440 and x437 in both two and three blade variants, so plenty of props to try this spring!

Well if you are buying a new box i have a epoxyyglass one made for that Speedmaster and the Mac motor. It is low in the front to clear the pipe, I have one in my speedmaster hull.

$30 shipped to you.