MRP 7a (aka 9age) Stroker Kit
This is not your generic stroker kit with bad rod/stroke ratios or some unknown crankshaft with no thought put into the design.
Huge amount of thought went into the design of this kit.
We are not a generic rod/crank supplier, we specialise in 4age performance and focus solely on making the best parts for your 4age
Our kits are being used all around the world with power figures past 900hp on 45psi of boost! or in N/A form 250hp+ and 10,000rpm
This kit has been on the market for 7 years and used in all types of racing with great success, many revisions have have been made to the design over time to provide better reliability and performance so you can be assured what your getting has been properly engineered and race tested to extreme conditions.
The pistons in this kit are a special custom design where we worked with CP to get what we needed.
Rod/stroke ratio is 1.52:1
Custom MRP 90mm Billet 4340 Crank Fully Counter Weighted
Large counter weights to dampen harmonics at high RPM which is essential to stroker crank designs for reliability
Extra large section through rod journal to counter weight for increased strength and reduced flex in one of the most critical areas of load
8 Bolt to take 4age flywheels
OEM 4age journal sizes so you can use the OEM 4age size bearings
Oil gallery holes have lead in/outs to help increase oil flow to the bearings.
Oil gallery feeds are the same as the 4age crank meaning constant 360 degree of oil supply to the journals at all times unlike the 7afe crank.
Dual offset crank sprocket keyway
Nitrided, Fully balanced
Custom MRP Billet 4340 conrods
Around 6% longer than the 7a rods
H-beam Heavy Duty
Rods are notched on the journals which acts as an oil squirter up into the bottom of the piston
ARP2000 Rod Bolts
800hp rated or 9500rpm (Those seeking 10k rpm + reliably should go for the Saenz conrods)
Nitrided & Fully balanced
**Optional Saenz Conrods available for those seeking super high end rods. These are 20g lighter than our MRP rods – Saenz are one of the best in the world**
**Optional Billet Aluminium Conrods available for drag engines only running on boost over 40psi**
Custom MRP Forged Pistons by Traum
Low compression height, 20v & 16v available in both N/A & Turbo to any compression you require.
Rings & gudgens supplied
Special short skirt design to reduce friction which helps power wise & reliability
Ceramic coating on the domes to reduce heat to the pistons and keep the heat in the chamber (optional)
Telfon coated skirts to reduce friction and also provides a dry film lubrication (optional)
Power rating of the kit 900hp+ & 10,000rpm+
Must be used with a 7afe block
No modifying of the block is required
Takes 4age flywheels
Crank ladders, Ross Race Harmonic pulley and cams gears are optional extra.
**All parts manufactured in the USA**
Other parts available on request:
Toyota OEM rebuild gasket kits
ARP Head & Main Studs
7a Crank sprocket mod
Twinplate clutch kits
Supertech Valve train parts
Head Porting Service
We can supply our cranks with custom rods or just custom pistons if you want to use the 4age parts that you have already obtained – Please contact us for pricing