Just wondering....

[1986Blazerk5]

Did the military use the same engine as the civilian model i know they both have the detroit 6.2 diesel but did the military make any modifications to the engine for more power or for more water forging depth, just wondering thanks

 

[Cucvnut]

the military has the j code 6.2 non emssion deisel and it came with more hp

 

[1986Blazerk5]

the military has the j code 6.2 non emssion deisel and it came with more hp

How much more hp?

 

[Cucvnut]

like 10 hp

 

[T_F_E]

It also has lower wrist pins so the compression is lowered slightly.

 

[Wolf.Dose]

Nope!
The 6.2 l Detroit Diesel has allways the same block, crankshaft, tie rods and pistons, whichever engine code it is.
J stands for heavy duty emmission of 1985, 1986 and 1987.
C is the low emission level for light duty trucks. Difference is the cam shaft and different valve size in the heads.
Injection pumps are basecically the same excempt the features for medium or high altitude (not used by the military) and allways J-pumps! (Standadyne DB2.
Power output is allways the same. The military states 135 HP net at 3600 rpm for the CUVC , here means the 2 102Amp gens charging fully. The label on the air filter states, depending of the year of manufacture, 150 or 155 HP.
The truth is 110 kW/150HP at 3600 rpm.
Hummvee is the same, however the manual states 110 kW / 150 HP at 3600 rpm. If the hydraulic fan blower cuts in, you suddenly loose 21 HP, this feels like somesone stepped on the brake.
Thats it.

Wolf

 

[BiggsChevys]

Nope!
The 6.2 l Detroit Diesel has allways the same block, crankshaft, tie rods and pistons, whichever engine code it is.
J stands for heavy duty emmission of 1985, 1986 and 1987.
C is the low emission level for light duty trucks. Difference is the cam shaft and different valve size in the heads.
Injection pumps are basecically the same excempt the features for medium or high altitude (not used by the military) and allways J-pumps! (Standadyne DB2.
Power output is allways the same. The military states 135 HP net at 3600 rpm for the CUVC , here means the 2 102Amp gens charging fully. The label on the air filter states, depending of the year of manufacture, 150 or 155 HP.
The truth is 110 kW/150HP at 3600 rpm.
Hummvee is the same, however the manual states 110 kW / 150 HP at 3600 rpm. If the hydraulic fan blower cuts in, you suddenly loose 21 HP, this feels like somesone stepped on the brake.
Thats it.

Wolf

didnt the "C" code 6.2l also have an egr valve (smog), where the "J" code did not because of GVW rating...?

 

[Wolf.Dose]

No, never saw one on the engines. My be you mix it with the two engine vent vales which were on the C engines. But you do not need them, one is sufficiant.
Wolf

 

[BiggsChevys]

well it sparked my own curiosity....

the "C" code 6.2l did have an egr valve... on some models anyways.... might be a cali smog thing but a search engine run of the phrase "86 blazer 6.2l diesel egr valve" turned up a a ton of listings.... about $200 each too.....

 

[southdave]

thought the IP pump was turn up on the Mil crap to compensate for JP-8 and a different oil pump and in take?

 

[T_F_E]

well it sparked my own curiosity....

the "C" code 6.2l did have an egr valve... on some models anyways.... might be a cali smog thing but a search engine run of the phrase "86 blazer 6.2l diesel egr valve" turned up a a ton of listings.... about $200 each too.....

all c code motors had a egr system