anyone out there have a pobjoy crank they want to part with?

You most lickly will have to find a German crank that has not been ground on the gournals and is straight and send it to him,. Or you could go DPR in america

Fabo

good luck finding a 'used' one that's not cracked to pieces..........if you do find one, get it crack tested before handing over any $$$

x4 for DPR

X29 it will be easier just ordering one from DPR....

I ordered a 78 counterweighted crank with lightened flywheel from DPR was approx $600 including shipping.

you can make 180HP and 8000rpm on a German stock non counterweighted properly built crank, find a good one and call me, I will get it done for you.

Second option DPR, DMS, Pauter

expected engine life?

well we all know engine life expectancy is not just about the crank

come to think of it, a nice Berg Welded 69 crank is available on cal-look.no

True. Being the "heart" of any engine but, it's quite important its known weaknesses/ design flaws/inherant shortcomings are addressed to provide the rest of the components a sound basis to work from. Those DPR cranks are good value $$$ start point for addressing the well known issues and risks of spinning a standard crank through 8000rpm

HP figures are not always stated with longevity in mind either.

Always interested to hear of different ways to get the job done tho, what tricks you doing !?!?

I doubt he's building an 8000rpm engine but it's definitely possible on the German Forging even without counter weights.
Biggest trick is to keep the rotating assembly light and balanced, then there is micro-polish, 8 dowel, etc.

I have a Pobjoy crank in the garage 0.10, 8 dowel, non welded.........not sure I want to sell it alone.
It's going in a 1835cc thickwall, Pobjoy Heads, Bugpack Rods, Bugpack Straight cuts, GB 310, Scat Rockers......

^^ maybe Stan forged it?

LOL.......Stan didn't do anything just put his name on it, supposedly came out of a "Pobjoy" 1915cc and I'm not stating that "his" crank will go to 8000rpm, all I'm saying is a German Forging can be made to.

heads and cam make the revs, everything else makes it stay together. no arguments!

the crank might do 8000 with a std german crank but the shitty mag case will be floged out in a very short time with out counter weights, dpr way to go 360degree counter weightsl drilled lightened blade ground 9000 baja tested rpm in an alloy case all day long, prefer to get my power from e85 boost and freindly to the planet , heard an l big may run at the easter meet at mt panorama next year cheers Rudi ps ive got a pobjoy crank in a complete 1916 minus heads ready to go pm me if u want more details

Never played with full circle counterweights so cannot comment just letting OP know what's possible.

If he definitely wants a Pobjoy crank he should just get one, also lets not forget the amount Stan and others like him have contributed to our hobby and let people decide for themselves which way they want to go, not that Stan's engines are my cup of tea but that's just my opinion.

Heads and cam create power together with induction and exhaust and allow the engine in their combination to breathe more efficiently at higher RPM, they don't just create rpm, they affect rpm which are created by the whole engine combination. No Arguements. It's all about the purpose of engine combination and quality of parts and assembly.

It's misinterpretation of information on these forums that sometimes steers newbies to the hobby in stray directions and impending let down.

Eg.

Hi flow heads, welded, hand ported, large valves
Hot cam FK87
Monza exhaust
Single 34
Stock rotating assembly

Who thinks this "hot" combination will rev past 4000

Craig, I'm happy to give you the details of who I believe is the best crank grinder around, you can let him know what you need but sarcasm won't fly with him and he'll let you know about it.

never mind,didnt think it would start all this

Action Cranks at Wetherill Park gets my vote.

Hey Craig

Don't understand mate you use to be one of Stan's disciples, while I think he is a great machinist, you used to preach that the guy walked on water !!!!

Why the 180 ?

mangrovejack, take up Bigrudi's offer. Send him a PM.

You're on the ball Craig Bob is the best there is.

Hey Ben and Craig, it looked like you two where starting to get a little crank-y with each other