RV8 billet cranks ?

[roverman]

There is a skilled U.S. billet crank manufacturer, that would consider building min. (5), at a time. Serious only, please, and no chatter about how great the oem. cranks are, and they "never" break. This is NOT an ad.   Cheers, roverman.

[quietone]

I am a long way into this engine already, and at this point, the crank is the weakest link. HOW MUCH?

[Moderator]

While you're at it, maybe you should consider single plane? They're available in England.

[Rotus8guy]

Like Larry said $? And what specs? Must all 5+ be identical stroke, bearing size, etc?

[roverman]

IMHO,using 2.5" mains and 2.0/2.1" rods, to be a good plan. Using available rods,also good. Being billet, I'm pretty sure strokes will be "open". Of course the sbb folks will want 3." mains, and giant strokes. I'm sending a crank drawing, for bid puposes. Too early to fish with prices. Anyone can get a one-off billet crank made for 2,600-$2,800, if you don't mind waiting 8 weeks minimum ?  This scenario, is to improve that situation.  TBC, roverman.

[quietone]

My understanding of single plane cranks in a V8 is that they shake pretty bad. Anyone had that experience?

[DiDueColpi]

Hey Larry,
I have a 78 308 GTS.
It does vibrate/resonate at various rpm's.
But nothing that would be found to be objectionable.
It is a pretty short stroke engine so that needs to be taken into account.

Art,
I'd be in on a large journal crank.
Something in the 75mm stroke range.

Fred

[minorv8]

If you take the flat plane route remember to add another grand for the matching cam.

[roverman]

Fred, When you say LARGE journal, really 3.0" ?? 75mm = 2.953". Sounds like a "spec 32v. engine"?  Jukka, I suspect most folks will want 3.4"+ strokes ? A 180 crank, with a large stroke, will prove problematic/impossible for one wearing dentures. If you "need" a roller cam for a 180 crank build, I have the blanks. Likely to be 500-$600. US.  Let's talk journal sizes, long vs short snout, and strokes.  Onward, roverman.

[DiDueColpi]

The large journal Rover engine 63.5mm/2.5'' Art.
55.5mm/2.185" crankpin, long nose, and 180' flat plane.

Cheers
Fred

[roverman]

This would make a sweet motor for JH roadster or GT, eh Fred ?  + easy to get camzzzzzzzzzzzz

[DiDueColpi]

Would get the Lo-ver motor finished.
Finally.

[roverman]

Got girdle, to handle all that shakin ?

[quietone]

Maybe you should call this the JLL crank. (Jerry Lee Lewis)