Con rods 8 cyl

pmlmbigpondcom

G'day All,

Phil here from Australia, restoring a 1934 Railton 8

My engine rebuilder wants me to change to something like Carillo connecting rods as he thinks the originals are weak !
What experience do others have ? I haven't heard much about them breaking but.............

Thanks

Phil

Huddy42

Phil, Where in Australia are you, contact me.
huddy42@optusnet.com.au

[Deleted User]

I would think that's a bad idea ,never heard the rods described as "Weak" .The eight was made from 1930 with updates to 1952. Basicly a good design for the times and was part of the Hudson reputation for value ,performance and good engineering .
And thinking back never recall seeing a eight with a hole in the side from a rod "Exiting" the crank case due to failure.

oldhudsons

ditto Tallent

TwinH

I think somebodies pulling your leg. Carrillo makes rods for really high end racing engines...

Geoff

Methinks your engine reconditioner is trying to increase his profits.

Frankvintagefullflowcom

Those Carrillos in conjunction with a high volume oil pump will make your 254 bulletproof. Ain't that right, Dave W.?
Do those guys just think we're stupid?
F

bob ward

Phil, it depends on how you will be using the car. For ordinary road driving the standard rods will be fine. If its going to be raced then the engine oiling system needs careful consideration, different rods may be needed as part of that revamp.

pmlmbigpondcom

G'day All,
Thanks for comments.
I too believe that the original rods should be fine - maybe stress relieved etc etc

We are building car with Peking to Paris 2016 in mind so a low stress reliable engine with a limit of ?? 4500 revs shouldn't cause the rods to break

Thanks
again

Phil

bob ward

Cool project. We will need lots of photos of the Railton rebuild and the Peking to Paris.

Sent you a PM

[Deleted User]

The Hudson 8 cyl . was rated at 128 hp @ 4200 rpm . Where the 6 cyl. motor was 121 hp @ only 4000 rpm. So I would'nt worry about it . The factory speck's for the 8 were higher rpm wise than the 6 ( from 1949 manual) .The only drawback of the splash oil system realey is in something like circle track racing . Where the constant centrifical forces caused poor oiling in the trough's for rod oiling.

terraplane8

And of course Hudson did the 24 hour speed test at an average speed of 89mph back in 1937. That would have been at near peak rpm. I read somewhere that the engine would spin to 5,000 OK on occasion but I wouldn't do that today with the old metal.

TwinH

Of course it is much more involved really,the 'normal' failure mode for a rod is going over the top (TDC) on the exhaust stroke. The inertia loads of stopping and reversing the pistons direction (with little to no pressure on top of the piston) try to stretch the rod and tax the rod bolts. If you buy into this, it follows that taking weight out of the piston does much or more to reduce the load on the rod. It is of course a balancing act of weight -vs- strength too. I would venture to guess that there would be enough safety margin built into the stock design to allow a mildy modified version to do some rally work. As always, "your mileage may vary"...

pmlmbigpondcom

Thanks for the ongoing comments Guys

Phil
Australia