Unlocked and clean up Again Last Chance

Hang on fellas, this is turning into a sh*t fight again. Now please stop and take a big deep breath.

OK we all know that the net has all sorts of irrevelant and superceed info.

So lets make a rule here so that we discuss only the correct facts. Now bohler steel do have their own official site with all the properties of their steel range and the correct proceedures for the various heat treatments.
So do just about every steel producer in the world,except for china cos it's nigh impossible to treat crap.

This is how sh*t fights start. No evidence to back it up. If you disagree with what has been posted then show and explain why.

Now I think that we should get back on track regarding the original topic and the side issues from that as the benifit of any technical knowlege can benifit all in some way or the other. If you do not agree with the engineering /physics laws then re-write them or just ignore them and do what you want.
Ok i'm out in the work shop trying to build engines for people for the up coming race meetings,but i an getting phone calls wanting to know what i'm going to do about the piece of crankshaft.
Iwill try to take it over tomorrow to be tested, but i do have an engine on the dyno so if i don't make it it will have to be tuesday or wednesday,ihave nothing to fear as i know what it tested last time,i will get aaron to post a photo when he can of the crank.

David you would like facts to be posted:
BMC made performance cranks for their race engines EN40b nitrided
Cosworth made all their race cranks and still do out of EN40B nitrided
Arrows of F1 fame still make cranks out of EN40B nitrided
Paul Ivy from england who has been making cranks all kinds of cranks for many years now EN40B nitrided
Now the yanks are making 4140 with 1% alloy so they can nitride their cranks.
Auscranks [Australia] make their cranks from 4140 and nitride them, i don't know if they are using the new 4140 but i shall ask the question.
So will some of the experts out there please tell these people they are doing it all wrong so we dont wind up with all these dud cranks on the market.
At least i have a go design my own cranks put them in an engine and try them if they don't work it's back to the drawing board same with my cams and valve spring some work some don't but at least i'm doing some thing to improve the breed not sitting back telling people how they should be doing it when they have nothing to back up what they are saying.now i'll go back to to building engines
Graham Russell


NOW BACK ON TRACK FELLAS

I will try to take it over tomorrow to be tested, but i do have an engine on the dyno so if i don't make it it will have to be tuesday or wednesday,ihave nothing to fear as i know what it tested last time,i will get aaron to post a photo when he can of the crank.
Graham Russell

The Sample

Here's the piece of crank to be tested.
No need to change the tests suugested, I'm sure your guy will do what is needed to get the results needed...

Thanks to Aaron for his interWEB picture wizardry!

Graham Russell

I think that if an extra main bearing is needed it probably should be behind the flywheel.

(just one crank after another)

ala similar design to the old Austin1800 , but make it better yesh?

for those of you who don`t know, they (the austin 1800s) have their spigot shaft (the clutch runs on it) from the outer end of the flywheel assy , sticking into the end of the crank & running in a bush, then the other end into a big bearing in the outer case a bit like an oversized outrigger bearing, with the 3-drop gear , in a case of their own, outboard of the whole flywheel assy, sort of backwards to a mini but "Normal" (funny enough) for a normal car`s clutch mechanisim

so you could make a 5-main &&&&&&&& have a really strong (bearing-ed) spigot shaft outboard, holding (or attempting to hold) the flywheel end from wobbling around yeah

ok, so now lets make it a small V8 crank with all new billet alloy machined block & cases, & &&&

And it is all aimed at 90° to our nuts.

I think we are onto something, the big heavy unsupported flywheel is subject to all sorts of gyro effects. They could almost break a crank just by going around a corner! (don't laugh, in the early 1950s the Cooper Bristol Formula 2 cars could break the crank from the results of a spin)
Ever spun the front wheel of a bicycle and then turned the steering? Think of a flywheel spinning at 7000 rpm... And it is all aimed at 90° to our nuts.

Someone should make a 5 bearing mini block & crank, just like the japs did when they copied the A series, the mighty A12,A15 etc in the Datsun 1200,120Y etc, or closer to home the Austin 1800. Maybe we could convince our Chineese friends to do it.