MRP Custom Long Rod 4age Setup
This kit is designed by MRP and caters for the ultimate 4age enthusiast.
Featuring a much longer rod coupled with a short piston design giving a rod/stroke ratio of 1.65:1.
The standard 4a rod/stroke ratio is 1.58:1
We have shown this to make an extra 10hp on an engine thats in the 200hp range using an Atlantic Spec MRP Head.
How this helps performance?
A longer rod makes more torque with the same piston force, and since it’s less angular than a shorter rod, reduces sidewall loading and decreases friction. All of this adds up to more power.
Longer rods also give the pistons more “dwell,” the brief periods of time the piston is at top dead center and bottom dead center. A longer dwell allows for better flow of intake and exhaust gases since the piston moves slower between up- and down strokes.
Longer dwell also offers more time to fill the cylinders during the intake stroke and more time to scavenge during overlap. And since the piston hangs out at or near TDC longer, the combustion stroke has more time to deliver a thorough release of energy on to the piston.
The kit features:
Billet 4340 MRP Spec H-Beam Conrods at 5% longer – With ARP2000 bolts
Custom Forged Traum Pistons made to order in any compression ratio and to suit both 16v or 20v heads (With Total seal rings & Gudgen pins)
Note: Normal 4age pistons will not work with this setup, for this setup to work the kit must contain both our items matched together
On check out please leave in the “Order Notes” section your desired compression ratio.