In this Tweet (dated 11 Sept 2013) Peter de Selding reported that Gwynne Shotwell of SpaceX said:
SpaceX's Shotwell: We're building 7 Falcon 9 fairings/yr now, 15 in 2014, & 4 engines/week rising to at least 5/week by January.
But I was wondering what they mean by 'engine'. First thought is Merlin 1D since they need 10 per Falcon 9 launch (9 on the first stage, 1 on the second/upper stage). But 4/week is 208/year. 5/week is 260/year.
That is vaguely 20 to 26 cores a year, and they are clearly not anywhere close to using that many engines a year. At best they are aiming for 8 launches in 2014, and maybe one Heavy, which is only 80 to 108 engines in 2014.
At some point, stockpiling Merlin 1D's gets to be counter productive.
On the other hand, each Dragon has 4 quads of Draco thrusters, with a total of 18 Draco total on a Dragon. Dragonrider (manned Dragon) is reported to have 8 Super Draco thrusters. Which seem would be on top of the 18 regular Dracos.
In that manner, a single Dragon would need 18 engines, ignoring the launcher, and a manned Dragonrider would likely needed 26 engines.
In 2014 they are aiming at 3-4 Dragon flights, plus a pad abort (Of a Dragonrider config), which would mean 54-72 Draco's just for the CRS missions and 8 Super Dracos + 18 Dracos for the pad abort test. So about 98 non-Merlin engines just for the manifested Dragon flights.
If they aim for 8 Falcon 9 launches (all V1.1 so all Merlin 1D's) that is 80 Merlin 1Ds and possibly as many as 98 Draco/SuperDracos. That nets out around 178 engines used up in 2014.
If so, it is kind of cheesy to classify a Draco (90 lbs (not kilo-lbs, just simply 90 lbs) with a 145,000 lb thrust Merlin 1D or a 75,000 lb Super Draco.