callies compstar rod and crank limits
12-13-2017, 04:58 PM
#1
callies compstar rod and crank limits whats up guys, whats the limit on these rods and 4 inch stroke crank. so far im at 25 psi, made 1025whp and 907tq through the th400 and 9 inch. would they take 1100whp reliably? Currently have the arp425 series bolts to 80 ft lbs. was thinking about giving it a whirl and see whats its made of lol.
Peak timing is 12.5 degrees at 25 psi. pump e85 for fuel.
Peak timing is 12.5 degrees at 25 psi. pump e85 for fuel.
12-14-2017, 06:08 PM
#5
I guess it also depends on weight; however our friend has them both in a 427ci Warhawk block/heads maxing out an 88mm turbo making about 1400hp (flywheel) for years.... hundreds of passes. WHile it never failed when he pulled the motor apart after a few years of street/track racing he said the crank was done. He ran it in a Mazda RX-7 with powerglide, 9" out back weighing around 3000lbs.
I ran a stock LS1 cast crank in an LS9 block with Compstar rods for years making hundreds of passes in the 1000-1200rwhp range in a 2900lbs RX-7 (T56 Magnum/8.8" solid) and the crank finally snapped (rear rod journal broke clean across and only thing holding it together were the rods) after a 1-4th gear burnout and the tires hooked up at full throttle still in 4th... instasnap. Mainly a 1/4 and 1/2 mile shootout car.
I ran a stock LS1 cast crank in an LS9 block with Compstar rods for years making hundreds of passes in the 1000-1200rwhp range in a 2900lbs RX-7 (T56 Magnum/8.8" solid) and the crank finally snapped (rear rod journal broke clean across and only thing holding it together were the rods) after a 1-4th gear burnout and the tires hooked up at full throttle still in 4th... instasnap. Mainly a 1/4 and 1/2 mile shootout car.
12-15-2017, 11:44 AM
#6
Good info.
I'd be curious to know about the Eagle Cranks. Haven't heard much bad about catastrophic failures but I've heard they're the lesser quality of the aftermarket budget cranks? Anyone snapped an Eagle or know people who have?
I'd be curious to know about the Eagle Cranks. Haven't heard much bad about catastrophic failures but I've heard they're the lesser quality of the aftermarket budget cranks? Anyone snapped an Eagle or know people who have?
12-17-2017, 09:00 PM
#7
seems to be the going rate of the cranks breaking before the rods actually break. ive seen heard this a few times now. above that 1200 whp range is when they really start to get hurt.
But it seems like i still have some room left to make a few more hp without really worrying about this blowing apart. ill kick it up a few psi and see what happens. i rather have it and not need it then vice versa.
But it seems like i still have some room left to make a few more hp without really worrying about this blowing apart. ill kick it up a few psi and see what happens. i rather have it and not need it then vice versa.
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12-22-2017, 10:28 PM
#8
I guess it also depends on weight; however our friend has them both in a 427ci Warhawk block/heads maxing out an 88mm turbo making about 1400hp (flywheel) for years.... hundreds of passes. WHile it never failed when he pulled the motor apart after a few years of street/track racing he said the crank was done. He ran it in a Mazda RX-7 with powerglide, 9" out back weighing around 3000lbs.
I ran a stock LS1 cast crank in an LS9 block with Compstar rods for years making hundreds of passes in the 1000-1200rwhp range in a 2900lbs RX-7 (T56 Magnum/8.8" solid) and the crank finally snapped (rear rod journal broke clean across and only thing holding it together were the rods) after a 1-4th gear burnout and the tires hooked up at full throttle still in 4th... instasnap. Mainly a 1/4 and 1/2 mile shootout car.
I ran a stock LS1 cast crank in an LS9 block with Compstar rods for years making hundreds of passes in the 1000-1200rwhp range in a 2900lbs RX-7 (T56 Magnum/8.8" solid) and the crank finally snapped (rear rod journal broke clean across and only thing holding it together were the rods) after a 1-4th gear burnout and the tires hooked up at full throttle still in 4th... instasnap. Mainly a 1/4 and 1/2 mile shootout car.
12-29-2017, 05:49 PM
#10
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The setup matters too. Blower guys have trouble with them around 800 whp. The extra stress from turning the blower and power loss for turning the blower doesn't show up on the dyno. They tend to flex in the middle and take out bearings.
01-04-2018, 05:11 PM
#11
We went 8,80 on the regular,at 3300 pounds with me , with compstar rods and crank with a Andy’s YSI kit , then then 8.42 with Turbo , shitty 60 ft like 2.05 60 and trap 182 so power was definitely there never realy went back and tried to go any faster had my old converter and no two stepon the 8.42 pass never had a issue with either the rods or crank actually reused them both just swap out piston and rings,