Detroit diesel hole in the block, repairable?

Capt J · Oct 9, 2017

rcrapps said: ↑

The 650 figures were shaft HP, around 675 - 680 flywheel with factory parasites.
There were a few attempts (non factory) to tweak some more out of them (up to 750 flywheel HP) but the base TI package just could not deliver enough air.
Instead of messing with the TI, marinizers went to the TA.
With the TA, more cool air was available cheaper than after market. Now they had room to tinker with cam timing, injectors and turbos.
These changes along with paint color, Detroit was glad to provide on the line.
Other sites (Pan-Tropic) still luved to tinker them selves.

That serial number is still so important and build history is still available from DDC.
Factory horse power, IMO, is still the best tune on any Detroit block.
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Yeah, but none of the marinizers kept them factory HP until the DDECs and Penske came along made them stop tinkering with them......Covington made 12v71 TI's up to 850HP, Key Power also 850HP and I forgot what J+T rated them at. I ran a set of Covington 12v71TI's that were rated at 735 or 750hp. The injectors used a really weird height 1.46" (generator setting in DD book for the injectors) instead of 1.98" (the factory marine injector height in the DD book.) At 1.98" they would black smoke like crazy at 1000 rpms and all of the way up.

Capt Ralph · Oct 9, 2017

Capt J said: ↑

Yeah, but none of the marinizers kept them factory HP until the DDECs and Penske came along made them stop tinkering with them......Covington made 12v71 TI's up to 850HP, Key Power also 850HP and I forgot what J+T rated them at. I ran a set of Covington 12v71TI's that were rated at 735 or 750hp. The injectors used a really weird height 1.46" (generator setting in DD book for the injectors) instead of 1.98" (the factory marine injector height in the DD book.) At 1.98" they would black smoke like crazy at 1000 rpms and all of the way up.
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Yep, black smoke.
You need cool air if you going to pour fuel in.

Capt J · Oct 9, 2017

rcrapps said: ↑

Yep, black smoke.
You need cool air if you going to pour fuel in.
Click to expand...

At 1.46" which is what Covington set them up at it runs crystal clean, no visible smoke at any RPM.

Capt Ralph · Oct 9, 2017

Capt J said: ↑

At 1.46" which is what Covington set them up at it runs crystal clean, no visible smoke at any RPM.
Click to expand...

Pure FM

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Detroit diesel hole in the block, repairable?

Capt J Senior Member

Capt Ralph Senior Member

Capt J Senior Member

Capt Ralph Senior Member