New member

[Greg Ruggles]

Hello everyone, just joined and am excited to start learning. My name is Greg and I have a 40" Dumas Scarb 337. It has a .46 O S Max VRM in it. I bought this boat when I was 16 and now I'm 61. I destroyed the stuffing tube back in 1980 and it sat in the rafters ever since. This past February 2024, I fix it up and got her wet. Quick question, is there a tuned pipe on the market for this engine? I want to go faster... who doesn't right?
Here's what the boat looks like now.

 

[Danny King]

Welcome aboard. Have a pic of the inside?

 

[Greg Ruggles]

This is what I've got. I'm told that this is NOT a tuned pipe for this engine. I've looked at a lot of websites and can not find anything for this engine. The engine runs great, tops out probably between upper 30's to low to mid 40's. I just bought a Picco 90 with a tuned pipe and a 5" engine mount for $300.00. I was thinking of putting it in the 40"Scarab,but people are telling me that would be to much engine for that size. I may now but a 47" Catamaran from Bonzi Sports and put the Picco in that instead. I may look at getting a CMB .67 and install that in the 40". I need more speed. I've also heard that putting a OPS 60~67 tuned pipe on the .46 engine would increase performance...but I was told by other people that it would hurt the performance be cause of "Lack of back Pressure". Like I stated earlier, I'm looking to learn and gather information. Here are some pics of the inside guts of the boat.

 

[Danny King]

This is what I've got. I'm told that this is NOT a tuned pipe for this engine. I've looked at a lot of websites and can not find anything for this engine. The engine runs great, tops out probably between upper 30's to low to mid 40's. I just bought a Picco 90 with a tuned pipe and a 5" engine mount for $300.00. I was thinking of putting it in the 40"Scarab,but people are telling me that would be to much engine for that size. I may now but a 47" Catamaran from Bonzi Sports and put the Picco in that instead. I may look at getting a CMB .67 and install that in the 40". I need more speed. I've also heard that putting a OPS 60~67 tuned pipe on the .46 engine would increase performance...but I was told by other people that it would hurt the performance be cause of "Lack of back Pressure". Like I stated earlier, I'm looking to learn and gather information. Here are some pics of the inside guts of the boat.

Lmao. Welcome to rc boating. Lots of opinions and many ways to go about it.
There is no substitute for lake time. Overthinking can be a killer.
Be patient and REMEMBER EVERYTHING!
Just because something didn’t work once doesn’t mean it doesn’t work.
What is the pipe length. From the plug to the pressure fitting

 

[K F Wheeler]

Welcome to R/C boating!
Sounds like you got bit by the bug... Well, got plenty of people on this site to help you with your questions. And, can sympathize with your affliction!

Ken