Blacktor
Active Member
Just to re-cap, I had a whipple stage 2 kit installed on my Raptor. Additionally I went with stainless power headers, off road y pipe and ATI 12% overdrive pulley.
While doing this draggy pull, the motor let go. Sent a couple of rods out the side of the block.
I should have taken pictures of the short block after tear down, but didn't want to bother my shop doing the work. Basically the pistons looked great with no signs of detonation. We're thinking the rods just let go.
Moving forward, I ordered a lower (9.5:1) compression short block from MMR. Since my cylinder heads were trashed, I also ordered new Ford cores and had them ported by Greg Good here in Houston. The cams were in good shape and I did not want to reduce idle quality, so we re-used these. We picked up 20whp from the old setup to bring us to 618. This seems about right for a drop in compression, and the head porting.
Where we sit currently is a running truck, but really poor part throttle drivability. It surges violently at 40-80% throttle positions. I did some research on here and heard some people talk about the Whipple throttle body causing this. I tested a stock GT500 throttle body with no improvement. Went back to the whipple unit.
Next month, I am getting the truck tuned by a different tuner to see if we can fix the surging. Since I'm paying for a new tune, we are dropping from a 3.250 upper to a 3.0. We'll see what happens.
On an unrelated note, I have OEM Fox front shocks, UCA's, Lower ball joints, sway bar end links and tires on order. I also got a new JLT catch can and bed cover that I'm pretty happy with.
While doing this draggy pull, the motor let go. Sent a couple of rods out the side of the block.
I should have taken pictures of the short block after tear down, but didn't want to bother my shop doing the work. Basically the pistons looked great with no signs of detonation. We're thinking the rods just let go.
Moving forward, I ordered a lower (9.5:1) compression short block from MMR. Since my cylinder heads were trashed, I also ordered new Ford cores and had them ported by Greg Good here in Houston. The cams were in good shape and I did not want to reduce idle quality, so we re-used these. We picked up 20whp from the old setup to bring us to 618. This seems about right for a drop in compression, and the head porting.
Where we sit currently is a running truck, but really poor part throttle drivability. It surges violently at 40-80% throttle positions. I did some research on here and heard some people talk about the Whipple throttle body causing this. I tested a stock GT500 throttle body with no improvement. Went back to the whipple unit.
Next month, I am getting the truck tuned by a different tuner to see if we can fix the surging. Since I'm paying for a new tune, we are dropping from a 3.250 upper to a 3.0. We'll see what happens.
On an unrelated note, I have OEM Fox front shocks, UCA's, Lower ball joints, sway bar end links and tires on order. I also got a new JLT catch can and bed cover that I'm pretty happy with.
