Ken...I think this person's opinion, if it is that...is somewhat in question.....I tihink the TBO on the R-1820-97 was 1200 hours...if it lasted that long....many engines were changed due to bad cylinders, as it was faster to change the engine than it was to replace a cylinder.
I speak as an FAA licensed Aircraft and Engine Mechanic as well as a qualifed flight engineer.
If the above statement is true that the overhaul time was the determining factor, then the rigors of combat should apply equally to both aircraft.
In fact the B-17s carried the brunt in the early days of the Pacific as the B-24s were just appearing in the year 1939 and on.
All three of the Bomb Groups..the 7th, 11th, and 43rd were all equipped with the B-17s and later were equipped with the B-24s, after the B-17s were either lost to the Japanese overrunning the airfields until the Battle of Midway.
These early B-17s did not have the later tokio tanks, and an interim additional tankage was fabricated in Australia with a tank installed in the nose and another in the radio room.
I think it is erroneous to make the point that the TBO had anytbing to do with early days...the conditions were so primitive that both the B-17 and B-24s would have suffered the same problems..
For an excellent book on the Pacific, I suggest reading Gene Salecker's book Fortress Against The Sun.
In addition, the early B-24s had a very weak nose gear that was very prone to failure, and had to have a modifiction accomplished in Australia.
As another thought, the supply situation in the Pacific was such that any spare parts including engines would have strained the supply....the Pacific is huge and vast....and the Pacific was not given the priority that the ETO and MTO were given.
I would therefore respectfully disagree with the original statement.
Jim :-)
James S. Peters Sr. T/Sgt B-17 Flt Engr, 27 missions 99 BG, 348BS, 5th Wing, 15th AAF Tortorella, (Foggia#2), Italy My Tour was from 12/03/44-06/19/45 M/Sgt USAF (Retired)