long or short?

[DangerousDerek]

I am looking at different options for pistons and rods and looking at US stuff.

I see that there are possibilities for 6" rods with a 1.25"ish compression height or a 5.7" rod with a 1.55"ish compression height.

So which one would be better and why?

[DangerousDerek]

macdeb said:

As I see it, the long rod makes for easier timing as it has a longer dwell at TDC whereas the short rod moves through quicker. Long rod has faster piston speed as opposed to the shorter but the shorter will have more lateral force on bores. Long rods faster piston speed can enhance chamber filling. What build are you thinking? High revving n/a or FI? What cam for either? [power/RPM]

Be a 4.8 or 5.0 forged, twin GT28's, M248, 22 psi for 600+

[DangerousDerek]

macdeb said:

Hmmmm, so steel crank then? I'd prob' go 4.8.
Oh, and different gearbox?

Whats up with a tuftrided offset ground crank?

Gearbox will come later (maybe)

[DangerousDerek]

Discopotatoes said:

Mines a standard 4.6crank no need to offset grind unless you go bigger that 4.8 if you have 96mm bores

I have a choice of cranks, 4.6 and offset 3.4" stroke.
Also getting a block relinered so can have the bore to suit pistons once I decide on customs or off the shelf.
Another block is at 96mm already but needs at least one liner.

So I can build a 4.6, 4.8 or a 5.0
I am still researching and open to ideas on pistons and rods