BTW its not 1000hp never said it was. what I did say was the block thats going in it for next season can handle 1000hp safely as its race tested to 1400 by Darrell cox (driver of the team mopar SRT-4).
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can i ask when darrel cox ever made 1400 hp on his neon blocks? I happen to know the tuner that tuned his engines. the biggest problem on the srt-4 block is the main caps are junk if ya try to make a bunch of HP. on this new block you got from DCR does it have the straps on the main caps?
here are the specs on the stroker kit that we are doing.
DCR 2.6L SRT 4.160 STROKER SPECS
CRANKSHAFT
The DCR Stroker Kit starts out with a brand new SRT-4 crankshaft in which we machine offset the rod journal to increase stroke to a total of 4.160 inches or 105.66 millimeters. This brings the total displacement with a stock bore of 3.446 to 155.19 cubic inches or 2.543 liters and in the automotive industry this would round out to a 2.6 liter. By machine offset we reduce the rod journal down to 1.7713 inches which is a safe diameter proven by the 4G63 engines. We also include in the machine offset a larger radius at the edge of the journals which in turn strengthens the journal connecting to the crankshaft. The big end rod width is increased to 1.0475 inches to utilize a better quality, wider bearing surface. Nonetheless, the DCR Custom custom coated rod bearings are .034 inches wider than O.E. and are a tri-metal design that we have proven over 1400HP in Brent Rau’s 6-second 4G63 Eclipse. While the DCR custom coated main bearing retain their standard size. The crankshaft is micro polished, oil journals chamfered, balanced and then goes through a special process of Ion Nitride. This process reacts with the factory casting and brings the crank up to be twice the strength of stock. The O.E. crankshaft is known throughout our racing program to get weaker throughout its cycles. After the Ion Nitride process the crankshaft does not decline in strength any longer. This process brings the crankshaft up to the strength that we have seen on the Madi cranks, which was a limited edition and are no longer available. If we bring the bore size up to 3.466 inches combined with the 4.160 stroke this displaces the engine to 157.00 cubic inches which is a 2.573 liter. If we bring the bore size up to 3.486 inches combined with the 4.160 stroke this displaces the engine to 158.81 cubic inches which is a 2.602 liter. With this in mind, we offer the stoker with a stock bore piston, .020 over and a .040 over. This kit is balanced and with all the parts weighed in, (keeping piston speed and forces in mind) we can safely rev this combination up to 8500RPM (depending on your particular application- email us to verify your combination).
PISTONS
The DCR custom pistons are 2618 alloy, weighing 335 to 360 grams depending on bore size. These pistons have a compression of 8.6:1 and we custom machine the pistons in house to accommodate any custom compression ratios depending on any customer compression requests. These pistons have a unique shaped dish which maximizes the effect of push on the piston during the combustion stroke. These pistons also have valve pockets to accommodate cam sizes up to 18’s Crane Cams with over .100 pistons to valve clearance depending on cam timing. Our pistons feature custom notches for the oil squirters and counter weights. They receive our signature coating, ceramic dish and CT-10 coated skirts. The ring grooves receive an ultra groove process which is a special ring groove machining process that provides near perfect groove flatness and surface finish. These tolerances are held to millionths of an inch. Above the top ring groove, the piston receives contact reduction grooves. The purpose of machining these grooves is to reduce the amount of contact area against the cylinder wall when the piston “rocks overâ€. Contact reduction also serves to disrupt the flame travel into the crevice area thus helping to reduce detonation. An accumulator groove is machined into the land between the top and second ring. It provides additional volume where residual combustion gases that have “blown by†the top ring can collect. This additional volume helps to reduce pressure between the top and second ring, thus aiding in top ring seal and minimizing ring flutter. Pistons have double pin oilers which deliver twice the amount of oil to the wrist pin as compared to a single pin oiler. The pin bore finish is precisely honed to obtain a clearance of .0008 inches between wrist pin and pin bore. The wrist pins are .866 in diameter and are the same pins that we use at over 1200HP in our race car. These pistons feature a 1.400 compression height which brings the piston to .025 just below the deck. The rings are a low tension design freeing up horsepower on the strokes of the pistons, not necessary to seal. We custom set ring end gaps for your particular bore in house. These rings are also proven well over 1200HP in our racing program.
CONNECTING RODS
The DCR custom rods are H-beam design, 4340 steel (vacuum degassed to remove impurities) and are manufactured from a two-piece forging. The forging process forces the grain into a shape of a connecting rod, resulting in a superior fatigue life. They receive a multi-stage heat treat and are shot peened to stress relieve the metal. Each forging is x-rayed, sonic tested and magnafluxed to ensure quality. The rod cap is forged separately so that the grain runs perpendicular to the load forces, which strengthens the rods. These rods have silicon bronze bushings for floating piston pins. These rods are equipped with 3/8†ARP 2000 Bolts. The rod length is 5.900 due to the increase in stroke. These rods are engineered to withstand up to 1000HP.
SIGNATURE PRODUCTS
Here at DCR there were many trials to displace the SRT-4 over the past four years. With the aid of custom engine building software, exclusive to DCR, we developed the stroker kit that maximizes the effective push of the piston on the combustion stroke. Our software has shown combustion gain efficiencies between 20-40%. Expect gains of up to 30% HP and Torque depending on your specific tuning and combinations (cylinder head, camshaft, engine management, fuel system, turbo, etc). After several attempts, countless hours and a lot of R&D, we developed this kit that would offer the enthusiast and engine builder a bullet proof solution of displacing the SRT-4 to a 2.6 liter. This kit comes complete as a rotating assembly which features crankshaft, pistons, rods, bearings, wrist pins, rings and a detailed installation sheet. A stock block should receive a good hone job and deck checked for flatness and requires no machining or notching of the block. This is a true drop in package. However, we highly recommend for the Do-It-Yourselfers to send bedplate to DCR to receive the Billet Bedplate Strap Kit and Crank Stud Kit to ensure crankshaft stability due to the increase in stroke and the additional forces (thee beastly horsepower and torque) that this kit offers.
Thank you for your inquiry!
Darrell Cox