A little trick for you DD guy's in airboating magazine

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Waterthunder
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A little trick for you DD guy's in airboating magazine

Postby Waterthunder » Thu Feb 14, 2013 2:58 pm

I have walked some people thru this when they building their own DD car motors. This is a cheap and easy band aid that improves bearing life. This works on motors that have a rear thrust bearing such as a SBC or BBC. What this does is guide pressurized oil from the bearing and directs it to the thrust face surface of the thrust bearing it's simple and effective. You take both bearing shells and with a small jewelers file you file a 45 degree chamfer on both sides of the parting line on both bearings when you hold them together you can see how oil is now flowing to the thrust face. Here is a pic of what you need to do. I have a dozen or so people with DD's that were wiping out bearings quick and after they changed bearings and did this their problems went away.
THE PROOF IS IN THE PROP!

"If you copy someone you will only achieve what has already been done."

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Re: A little trick for you DD guy's in airboating magazine

Postby Waterthunder » Thu Feb 14, 2013 3:11 pm

Here is a pic of what you need to do to help improve bearing life on a DD.

Image
THE PROOF IS IN THE PROP!

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Re: A little trick for you DD guy's in airboating magazine

Postby JAMES » Thu Feb 14, 2013 6:06 pm

Waterthunder wrote:I have walked some people thru this when they building their own DD car motors. This is a cheap and easy band aid that improves bearing life. This works on motors that have a rear thrust bearing such as a SBC or BBC. What this does is guide pressurized oil from the bearing and directs it to the thrust face surface of the thrust bearing it's simple and effective. You take both bearing shells and with a small jewelers file you file a 45 degree chamfer on both sides of the parting line on both bearings when you hold them together you can see how oil is now flowing to the thrust face. Here is a pic of what you need to do. I have a dozen or so people with DD's that were wiping out bearings quick and after they changed bearings and did this their problems went away.

THATS GREAT BUT U SAID BAND AID HOW LONG DOES IT LAST AND IF JUST A LIL LONGER THEN NORMAL HOW CAN U FIX THE PROBLEM OTHER THEN GOING GEARBOX OR AC/GPU TO LAST A NORMAL MOTORS LIFE !?
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Re: A little trick for you DD guy's in airboating magazine

Postby jimmy » Thu Feb 14, 2013 6:10 pm

what's "NORMAL" in an airboat??????????

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Re: A little trick for you DD guy's in airboating magazine

Postby HVGator » Thu Feb 14, 2013 6:34 pm

Should this filing be done just to the thrust bearing or all bearings?
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Re: A little trick for you DD guy's in airboating magazine

Postby rocketrob » Thu Feb 14, 2013 6:48 pm

Dave ; maybe you have tried this , but what about filing that same notch in the upper bearing only directly in line with the oil hole in the bearing ? Could this supply an even better flow to the thrust surface ? Of course the sizing of the groove would be paramount as to not bleed too much oil psi off the rear main and of course the groove will only supply oil to the required thrust surface ?
Rob

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Re: A little trick for you DD guy's in airboating magazine

Postby rocketrob » Thu Feb 14, 2013 6:54 pm

Dave ; Not trying to steal your Thunder LOL , but my mind is always working on these kind of problems .
Rob

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Re: A little trick for you DD guy's in airboating magazine

Postby JAMES » Thu Feb 14, 2013 7:27 pm

jimmy wrote:what's "NORMAL" in an airboat??????????

IF THATS ADDRESSED TO ME ID SAY SINCE WATERTHUDERS MOTORS ONLY COME WITH A 1YR WARRANTY ID SAY 1 YR :D
NO MAN ID SAY EVERY FEW YRS B4 THE EVERYDAY SBC NEED TO BE GONE THROUGH DD WISE
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Re: A little trick for you DD guy's in airboating magazine

Postby jimmy » Thu Feb 14, 2013 7:44 pm

what i meant james, is that , is there such a thing as normal on an airboat? i have seen some worn out junk with 100,000 miles pulled out of a pos car and ran on a boat for years, and then some HIGH DOLLER brand new engines, not able to make it to the end of the canal
before hearing tic tic tic,,,BOOM
what is normal?
DAVE, when ya file yer edge .do ya tend to file towards the side of the bearing that will see the thrust?

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Re: A little trick for you DD guy's in airboating magazine

Postby crowhater » Thu Feb 14, 2013 9:14 pm

Hey Dave thanks for taking the time to pass on a little knowledge.
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Re: A little trick for you DD guy's in airboating magazine

Postby Wild Bill » Thu Feb 14, 2013 10:11 pm

That's the old Waterthunder that helped out the the little guy back when I started out. Truly appreciated the wisdom and PM's :cheers:

So yeah just the thrust say center of the bearing to the rear.

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Re: A little trick for you DD guy's in airboating magazine

Postby yobee » Fri Feb 15, 2013 4:48 am

This is very helpful to me.
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Re: A little trick for you DD guy's in airboating magazine

Postby Jake.R » Fri Feb 15, 2013 6:34 am

crowhater wrote:Hey Dave thanks for taking the time to pass on a little knowledge.


X2 thanks!
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Re: A little trick for you DD guy's in airboating magazine

Postby dan-o » Fri Feb 15, 2013 7:50 am

yobee wrote:This is very helpful to me.

:laughing3: :laughing3: :laughing3: :laughing3: What a d!ck. lol.
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Re: A little trick for you DD guy's in airboating magazine

Postby CarMotorBarge » Fri Feb 15, 2013 10:12 am

You didn't know Yobee was putting a direct drive EcoTec on his boat. Give him a call. He is trying to get the great fuel mileage of an EcoTec and the great fuel mileage of a DD all in one package. Told me he was planning to get 20 MPG.
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Re: A little trick for you DD guy's in airboating magazine

Postby Waterthunder » Fri Feb 15, 2013 10:19 am

I have helped several people do this and some have 3, 4, 5 years on their motors. I tore one apart one because the owner wanted me do hotrod his motor and the thrust showed zero signs of wear he had .012 crank end play on a 400 SBC after around two years of running.
THE PROOF IS IN THE PROP!

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Re: A little trick for you DD guy's in airboating magazine

Postby yobee » Fri Feb 15, 2013 11:24 am

dan-o wrote:
yobee wrote:This is very helpful to me.

:laughing3: :laughing3: :laughing3: :laughing3: What a d!ck. lol.


That is an offensive post. Name calling is not appreciated.











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Re: A little trick for you DD guy's in airboating magazine

Postby Quick Draw » Fri Feb 15, 2013 11:31 am

yobee wrote:
dan-o wrote:
yobee wrote:This is very helpful to me.

:laughing3: :laughing3: :laughing3: :laughing3: What a d!ck. lol.


That is an offensive post. Name calling is not appreciated.


Lmao :lol: :lol:








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Re: A little trick for you DD guy's in airboating magazine

Postby Waggin » Thu Feb 21, 2013 10:17 pm

cool tip, would also work in a car with manual transmission, Thank's for sharing
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Re: A little trick for you DD guy's in airboating magazine

Postby Olf Art » Fri Feb 22, 2013 2:24 am

Waterthunder wrote:I have helped several people do this and some have 3, 4, 5 years on their motors. I tore one apart one because the owner wanted me do hotrod his motor and the thrust showed zero signs of wear he had .012 crank end play on a 400 SBC after around two years of running.

Cool tip, Dave ...... thanks for passing it along! It's really pretty amazing that the thrust bearings hold up as well as they do when
you think about the amount of pressure that's on them when the engine is turning a prop.
Not only do you have radial loads from the weight of the prop (never mind what that bearing is going through if your prop isn't balanced!) but enough thrust load to shove you and your entire boat up on plane and then keep you there. Wow.

Is there any one brand of bearing that seems to hold up better than the rest? What about brand/type of engine oil?
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