"HUMP" style header .67 Greenhead

[Ron Zaker Jr]

I have already talked with Stu, CMB does not offer it. What I'm looking for would resemble the Nova .21 header that lets the pipe stay more parallel to the radio lid,but for a CMB .67 Greenhead.. Any ideas or thoughts? Thanks.

 

[John Beardslee]

Ron most of the header tubes are very soft, Ive made wood and aluminum mandrels and bent offsets fairly easy with no heat. A lot depends of course how extreme the offset is.

 

[John Beardslee]

I sometimes fill the tube with salt to keep the integrity of the tube I.D.

 

[Ron Zaker Jr]

I sometimes fill the tube with salt to keep the integrity of the tube I.D.

thank you for the ideas.

 

[LarryBeals]

There or all kinds of ac fitting in the junkyard .

 

[Ron Zaker Jr]

There or all kinds of ac fitting in the junkyard .

thanks

 

[Mike Siriani]

Won't that bend affect the pipe performance??

Mike

 

[Ray Sametz]

Ron, if you take the 10* header and cut it parallel to face, spin it 180* and have Tom Foley re-weld it should give you what you want.

 

[Tom David]

I have not seen an issue of pipe performance with this style header in my CMB 21

This header has 2 offsets in its design.

Not only keeps Pipe parallel to tub-but also allowed me to set motor VERY low in tub.

The lower the c/g-the better the boat turns.

In video below I dont turn tight on the buoys but the boat is

capable of doing so.

This old man has had a problem staying off the bouys so I played it conservative in race below.

 

[Ron Zaker Jr]

Ron, if you take the 10* header and cut it parallel to face, spin it 180* and have Tom Foley re-weld it should give you what you want.

GOT IT THX

 

[Brian Spitzer]

Found these on the Novarossi Italy Website, looks like they might possibly have something with the correct offset, I would think Ron Shaw could order it.

http://www.novarossi.it/2012/index.php/en/products/manifolds/plane-rex/10-15-cc.html

 

[BobBonahoom]

Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:

 

[Tom David]

Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:

Great Find Bob

 

[Ron Zaker Jr]

Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:

THX

Great Find Bob