2004 CMB Hydro motor

[Brian Blazer]

After my first engine broke the rod after a couple of runs, I got a replacement.

If it blows up again, I am pretty much out of luck since Tidewater said it is the final replacement.

How do I know everything is ok now? Some people say it is the rod, and some people say it was faulty bearings. Is anyone running this motor with reliability?

The bearings are not Swiss bearings

The larger bearing says Germany INA 6001 C3

Brian

 

[[email protected]]

Bria,

that's cool they warrantied the motor.

 

[gil sonsino]

Well the last batch of 2004 CMB seem facing lot of problems with failures mainly with conrods in the ..45Rs---91RS and as usual distributors just don't want to get the right support.Remember Picco mess time ago and now CMB....it's enough.

Try to get a hold of Dave Marles at Prestwicth once I 've read this issue in his forum yesterday.

Good luck

Gill

 

[Jerry Wyss]

Oh Gawd Brian! Your Scareing The Hell Outa Me,,,I just , Today, bought a CMB For a Friend Of Mine,,A New 67H Racing!!

A "Hulk" of an Engine,,with a green head. I came to this web site to ask Tim Duggan what I should do to this Engine besides

Deburring it. With The Picco's I've had in the past, I Opened up the big end of the rod,(learning after a past mistake)

But This Thing has Needle bearings at the big end of the rod,,,,Now the first thing I see is someone having Rod Problems

With The Same Make Engine! Help Mr Wizard!!! Hey Tim, WHERE ARE YOU!

Mark Anderson Also,,,He Told Me This Was The Engine To Get For A Heavier Scale Boat,,,Mark, Are You Out There!!

 

[Don Ferrette]

"The bearings are not Swiss bearings

The larger bearing says Germany INA 6001 C3"

Brian-

Dump the bearings & get a set of the swiss WIB bearings from Ron Byrd (Racecraft Bearings). It is my understanding the newest CMB's are coming thru with the WIB's & they are staying together. :huh:

 

[TimD]

Jerry,

The green head is a very strong engine out of the box! Just do the usual stuff if you feel the need to modify it like deburring and cleaning up the edges of the ports. No need to worry my friend! They are very reliable and perform well.

Now the issue with the 2004 45 cam motor. The 45Cam2004's I have seen are a very fast motor when not breaking rods. Several people here have got them going successfully now without failures.

There is 2 trains of thought about the rod issue in this motor.

1. The INA bearings don't have as good a tolerance as the WIB swiss bearings and should be swapped.

2. Some of the rods have been hardened too much or incorrectly and making the rods brittle.

Brian,

I'd suggest you look at both of the above items and change accordingly or it could be costly!

 

[Jerry Wyss]

Hey Don, Brian was talking about blowing a rod,,,And I ,,think your talking about Main Bearings,,Am I missing something Here?

 

[TimD]

Jerry,

The bearings do contribute to the rod failure

Tim.

 

[Don Ferrette]

Hey Don, Brian was talking about blowing a rod,,,And I ,,think your talking about Main Bearings,,Am I missing something Here?

The bearings had too much play in them & things were flexing because of it.

 

[Jerry Wyss]

Gawd,,I Feel Like I Just Took 3 Valiums,,Whew!! ( I Don't Really Take'm)

 

[Jerry Wyss]

Roger That Don,,I Copy Your Flexing

 

[Brian Blazer]

From what I have seen, the green head .67 is an awesome motor. I haven't heard of any problems with it.

I will change out the bearings on my .45. Can't do much about the rod. MAC engines are bulletproff and are made at the same place. I find it odd that the MAC engine don't have rod problems and the CMB .45's do. I am going to take appart my new MAC .45 to see if they are swiss bearings.

Brian

 

[Jerry Wyss]

While We're All around the 'peuter, Can You Tell Me Tim if that Mod Picco 67 of Your's,,Uhh Mine, will like a Octura 1465?

My 67 would barely turn it at sea level,,course I din't know how to mod the props then,,but it was fast enough to blow it off

the water like a sheet of plywood off the pavement in a Hurricane.

 

[Terry Keeley]

From what I have seen, the green head .67 is an awesome motor. I haven't heard of any problems with it.
I will change out the bearings on my .45. Can't do much about the rod. MAC engines are bulletproff and are made at the same place. I find it odd that the MAC engine don't have rod problems and the CMB .45's do. I am going to take appart my new MAC .45 to see if they are swiss bearings.

Brian

Maybe take a look at the rods too, maybe they're the same.

 

[TimD]

While We're All around the 'peuter, Can You Tell Me Tim if that Mod Picco 67 of Your's,,Uhh Mine, will like a Octura 1465?My 67 would barely turn it at sea level,,course I din't know how to mod the props then,,but it was fast enough to blow it off

the water like a sheet of plywood off the pavement in a Hurricane.

Jerry,

The picco was mounted in an SG80 and would pull a H38, H49, or a 1667 on 50% nitro.

the trick with picco 67's is to use the torque rather than rev's. Set the pipe I sent you to 11 3/8" to 11 5/8" plug to weld and prop to suit!

Not sure on what prop to run in a scale boat.

Tim.

 

[jeff baham]

brian, i talked to dave marles and he told me that those bearing are good bearing

 

[bsmtboy2]

The greenhead cam67 is a BEAST of a motor and i have had good success with it but just this past weekend the needle bearings failed and ruined the crank,rod,and i think it was due to leaning out the motor 1 time too many in combination with the main bearing set that was still in the motor. I just ordered the replacement parts for 150.00 (ouch) from hobbysupplies in Austrailia . I also have the 45 cam2004 motor and i guess i need to change out the bearings before it goes KA_BOOM as well.

 

[Jerry Wyss]

Tim, I said " Scale Boat",,But it's not Unlimted 1/8 Scale. It's Phil Thomas's 82U55 Hull, Modified,(leading

edge of the sponson booms,,or Deck,,Cut back 3 1/4 inches,,and I Made a "Plug", for a silicone mould

modeled after a full sized, 6 Liter National Modified inboard,,Pennzoil Sponsored,, Named, "Big Bird", Owned

By a man Named, Ray Lynn, of New Jersey ; I made the plug and the mould,,For the one piece Cowl.

It's an Awesome Looking Boat,,,Sinister Looking To The Max, and as soon as I can get my friend to help

me to get a Pic of it and it's "Lunatic" owner on this web site, then you can see the New home for Your,,My

New Picco.

 

[Bart Drieghe]

with failures mainly with conrods in the ..45Rs---91RS

Thats not true Gill , u got to read that forum good , it goes about the crankpins , not the conrods .

The main problem with the 45's in the last years is the breaking of the crankpin .

Evo 2/2 and RS appear to have the same problem . But being correct , i know a few people who are running those engines without problems .................. .

And as far as i know , there's no problem with the 91 RS ( except if u go too lean that u have detonation )

Regards ,

Bart

 

[gil sonsino]

Dear Bart

I'm not saying CMB motors are not good absolutely.

I.m just telling that there is something wrong going on with new releases and specially with CMB45/2004 rods at least here once we have three brand new rods braking absolutely clean in different areas: one in the botton and others in the top .I wonder it is a problem with the needlles maybe and the manufacturer must be aware of this.By the way they were replaced for free showing that Braghieri's are serious people and do no kid they customers.

I also read the thread CMB Evo2/2 with crankpin problems so something must be done to save our precious bucks.

Just to mention all failures happened in advanced boater's riggers with stock engines during break in so....... I'm sure the problem will be fixed soon.

Anyway CMB are still great motors running consistently strong here in downsouth!

Best regards

Gill Brazil