What's YOUR opinion on splayed mains?

[DieselBully]

So?

 

[Twisted Steel Performance]

I'm all for it, it's the only way to stop cracking the mains......

 

[btfarm]

They've saved an awful lot of high powered Drag motors. Can't go wrong here either.

 

[tanman_2006]

I'd do it. Only problem is see is it seems the rods might be weak point also now when pushing enough fuel to need splayed mains.

 

[bison]

There's always gona be a weak point somewere

 

[vstech]

I use them on my SBC 400 motor. only way to handle any serious power in that weak block... I don't see much point to it using a cast crank though...

 

[THEFERMANATOR]

I'm all for it myslef if you can afford it and your block has the meat for it.

And moved to 6.5 performace as it seems more appropriate here than the regular 6.5 section.

 

[tanman_2006]

I use them on my SBC 400 motor. only way to handle any serious power in that weak block... I don't see much point to it using a cast crank though...

Scat is forged isn't it?

 

[ak diesel driver]

nope but it is cast steel

 

[tanman_2006]

So cast steel is an improvement over cast iron (assume oem is iron)

 

[ak diesel driver]

yep better metallurgy. forged would be ideal

 

[guybb3]

Peninsular has a forged steel one iirc.

 

[Mike K3500]

GEP block, with splayed mains and forged crank...

 

[countryboy69]

Let me add a question for discussion. Which would be better and more feasible.....splayed or girdled? I have not tested this on racing gas engines either.

 

[ak diesel driver]

depends on the girdle. if it's just one of the store bought units then splayed is better IMO. if it's a full on girdle like the p400 than I think the girdle would be better

 

[tanman_2006]

There are more arguments against a girdle than splayed.

Cost is the main problem with splayed. Girdles aren't made out of the same cast iron as the block so they won't expand at the same rate which could cause more stress than it stops.

 

[EWC]

What kind of arguments ?

 

[tanman_2006]

Cost is the main problem with splayed. Girdles aren't made out of the same cast iron as the block so they won't expand at the same rate which could cause more stress than it stops.

Girdles just ensure all of the mains move together and can actually break more.

The only bad thing I see with splayed mains is cost. The structural improvements are proven