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Nitro Harley Connecting Rod (and Other Breakages) (1 Viewer)

dboxell

Nitro Member
Run Nitro they said, It will be fun they said.....
Don't know for sure, but may have been a plate rod, not forged.
 

DrRocket

Nitro Member
Trying to make something engineered 100+ years ago run 5's.
Well, think about it for a minute. The Harley Davidson engine V-twin is really just a slice out of the radial engine pie. Radials usually produce a pretty healthy amount of HP.
 

Ramjet

Nitro Member
Don't know if the Nitro bikes actually use a Harley style Wheels and Rods assembly, but if they do it is amazing that those things even stay together after they start, never mind under power. The rods fit together with one straddling the other (not side by side) on a pin that is pressed into the two wheels. The bearing width is about 1" across total. The "Crank" is two Wheels and a pin not even welded - just pressed. You align the wheels with a Dead Blow hammer. These parts have to be made out of "Unobtanium".1584900784325.png
 

nwspeedshots

Nitro Member
OK; not entirely on-subject, but I’m stuck at home, and bored, so here’s my connecting-rod story.

I was Chief Photographer for a hydroplane racing group consisting of large, big-block (and a few small-block) powered boats. At the time, they were essentially the next step below the turbine-powered Unlimiteds. Racing in Valleyfield, Quebec, one of our teams (Wil Muncey, son of the late, famous Unlimited driver, Bill Muncey) bent a rod. A four-boat exhibition, scheduled for the following Wednesday in South Dakota (!) didn’t allow time for parts shopping. Tthe team clamped the rod to the crane-deck, attached the crane-hook, and pulled it “straight”. Worked well enough to run the exhibition, guaranteeing a race-site for the next few years.

I’m sure y’all are going to chime in with the fact that a BBC rod is available at any Walmart… I’m a photographer; I don’t know anything about all that. Just know what happened, and that it worked. :)
 

Nick Name

Nitro Member
Don't know if the Nitro bikes actually use a Harley style Wheels and Rods assembly, but if they do it is amazing that those things even stay together after they start, never mind under power. The rods fit together with one straddling the other (not side by side) on a pin that is pressed into the two wheels. The bearing width is about 1" across total. The "Crank" is two Wheels and a pin not even welded - just pressed. You align the wheels with a Dead Blow hammer. These parts have to be made out of "Unobtanium".View attachment 5823
The nitro bikes use a one piece billet crankshaft with side by side aluminum rods on plain bearings.
 

Butch

Nitro Member
Mark was that the Grand Prix boats? When the series came to Toledo for a few years, I sponsored one out of Quebec, Exectiff.
Ran a blown Rat on alcohol
 

nwspeedshots

Nitro Member
Mark was that the Grand Prix boats? When the series came to Toledo for a few years, I sponsored one out of Quebec, Exectiff.
Ran a blown Rat on alcohol
We were the west coast version of that. We were called ‘Unlimited Lights’. The Grand Prix are primarily an east coast and Canadian series. Where they are entirely supercharged on methanol, we also allowed a normally-aspirated package ( and a small-block combination as well ). The varying combinations were ultimately the demise of the series; it became difficult ( with a few exceptions ) to keep the carbureted boats competitive with those running blowers. Eventually, the blown boats split off and formed a Grand Prix series of their own. Our series was pretty healthy through the early 2000s, and in its heyday, it was a lot of fun.

Incidentally, one of our teams purchased one of the former Executif hulls and, following a fairly extensive rebuild, raced it as an Unlimited Light.
 
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