Forged Pistons

After years of developing our custom-made pistons for our stroker kits, we are finally ready to introduce the ZRP line of pistons. They will be offered in our preferred performance “recipes” and divided to two main categories to choose from based on the customer’s needs. Choose your pistons depending on your project and get more power and reliability!



As the name suggests, these will be developed for mild to high tuning mainly for road or race cars that want to develop their engine for high mileage and/or street use. These will be designed by ZRP engineers and manufactured in Germany from 4032 (T6) high-silicon alloy, low-expansion alloy which allows the engine builder to run a closer piston to bore tolerance thus producing a better seal. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. We have chosen Round Style Skirt design for Turbo Application and X-Style skirt for Natural aspirated engines with Over size and deeper valve pockets to allow even the most extreme camshaft profiles to be used. They have Offset pins for quiet operation and the wrist pins are made from 9310 alloy. Other features include Anti-detonation grooves to protect the first rings, gas pressure accumulator groove for better ring seal and vibration relieve. Premium Japanese quality 1.00mm x 1.20mm x 2.80mm ring package included.

Optional coatings available per request:
Thermal barrier coating “Blast Off Bronze” / Moly Side-Skirt and Under-Crown coating “Stealth Black”



The high-performance pistons series will be called “Diamond Series” and they will be engineered with only one thing in mind: WINNIG RACES. These will be manufactured from Diamond Racing in the USA from 2618 material. Diamond racing company is known from the late 60s to produce the highest quality engine parts around. The past 2 decades Diamond has solely dedicated itself to manufacturing forged pistons. With all state of the art machinery they offer customers the state of the industry in machining. The Coordinate Measuring Machine (CMM) is one of several sophisticated pieces of measuring and modeling apparatus used in Diamond’s engineering department. The CMM provides very accurate measurements, measuring the location and details of valve pockets, for example, to within a .0001in. This laser scanner is used for modeling purposes, especially for scanning piston domes where it scans thousands of surface points in minutes. Developing the highest quality pistons in the industry by using the latest CNC machinery and computer software aids, as well as providing unmatched quality control. With these credentials it was only a matter of time before we decide that this is the firm to work with for making unlimited horsepower!

Optional coatings offered per request:
Thermal barrier coating “Blast Off Bronze” / Moly Side-Skirt and Under-Crown coating “Stealth Black” / Hard anodized coating / Double diamond coating / PTFE coating, Hard anodized and Teflon seal coating