Stock Bottom end ?

white2000neon · Post by **white2000neon** » Tue Oct 31, 2006 2:45 pm

Ok how high can you relatively safely rev the stock bottom end. Its a magnum if that matters.

turbodudey · Post by **turbodudey** » Tue Oct 31, 2006 4:38 pm

I'm not sure exactly what the safty factor DCX uses for internal engine components, but I would venture a guess somewhere around 2 or 3. (fyi: saftey factor is the ultimate strength of the material/design stress)

The stress on the bottom end is fairly proportional to rpm, however at high rpm I would suspect that the stress curve would become nonlinear with respect to rpm.

So, ultimatly I would recommend not exceeding 7k rpm by very much on the stock bottem end, because the rods will stretch. And when the pistons and valves interfere it's generally not a good thing.

fixitmattman · Post by **fixitmattman** » Tue Oct 31, 2006 5:28 pm

Probably good for at least 8k. I don't think they changed the bottom end for years and the DOHC 1st gens didn't cut out until 7250RPM. If you've got the mods to support it, then I say go for it.

Kevin_GP · Post by **Kevin_GP** » Tue Oct 31, 2006 6:04 pm

Ive always heard its more the top end you need to worry about. I wouldnt go over 7800 on a stock bottem end with a built top end.

quicksilvr · Post by **quicksilvr** » Tue Oct 31, 2006 6:18 pm

On a perfectly balanced bottom end, 7500-7800 has been proven to be fine. Stock bottom end, I wouldn't regularly push past 7500.

white2000neon · Post by **white2000neon** » Tue Oct 31, 2006 9:27 pm

Ok as long as i can rev it high enough to make use of the crane 14 i'm getting and thats of course with the crane valve springs also. I think the 14 make peak power somewhere around 7400 but dont quote me on that.

bad04srt · Post by **bad04srt** » Tue Oct 31, 2006 10:24 pm

i THINK it peaks a little lower than that...special emphasis on THINK