| Author |
Message |
Robert Cox (Bob05)
Registered Member
Username: Bob05
Post Number: 6
Registered: 5-2007
Posted From: 75.14.223.10
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, May 27, 2007 - 8:19 pm: | |
at present I'm running 9a90 injectors in my silver 92 could that be my heat problem? If so what would be the correct replacement? |
clark lane (Bus05eagle)
Registered Member
Username: Bus05eagle
Post Number: 10
Registered: 3-2007
Posted From: 74.33.50.196
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, May 27, 2007 - 8:37 pm: | |
9a90 are not that big of injectors for that engine you are running about 425 to 445 hp depends on how you are set up the 8v92 just takes a large cooling system if you get alot of black smoke it will run hot also Eagles don't have a lot of cooling problems most of the time |
Luvrbus (Luvrbus)
Registered Member
Username: Luvrbus
Post Number: 37
Registered: 8-2006
Posted From: 74.33.50.196
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, May 27, 2007 - 9:03 pm: | |
if you are trying to cool the 8v92 with the radiator from a 8v71 about 36inx32in and the small fan it just will not cool |
George M. Todd (George_mc6)
Registered Member
Username: George_mc6
Post Number: 167
Registered: 8-2006
Posted From: 207.231.81.59
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 28, 2007 - 12:22 am: | |
Bob,
Are you running an automatic? If so, how are you cooling it? If you put an 8V92 in place of an 8V71, without enlarging the radiator, that is the problem. If you are running an automatic, with a "dual plate" engine oil cooler, maybe adding a fairly large fan forced oil-to-air cooler in the trans line before the engine oil cooler would help. This will only help if the bus only overheats after a long run on a hot day, or in other words, the radiator will "almost" do it. The previous two posts are correct, the horsepower rating/injector size is right, and is a reasonable number for an 8V92.
HTH, George |
john w. roan (Chessie4905)
Registered Member
Username: Chessie4905
Post Number: 573
Registered: 10-2003
Posted From: 71.58.117.21
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 28, 2007 - 11:23 am: | |
Dug out some of my DDA brochures....Heat rejection on a 8-V71@ 245 hp is 7205 BTU's/min.( N-60 injectors ) On a 8V-71 @ 410 hp it's 13,390 BTU's/ min. ( N-90 injectors ) On a 8V-92 @ 350 hp it's 10,160 to 10,850 BTU's/ min. (9E80 injectors). On an 8V-92 @ 475 hp, it's 13,400 BTU's/min. ( 9G90 injectors ). If you derate your 8-92, you can reduce cooling demand and increase engine life. Whether it will be enough, that's the question. Probably will need to change the turbo also. Will you be willing to sacrafice the power loss? If you have low enough numerical axle ratio you may be able to run the engine slower which is one of the reasons for the lower rating hp. A 350 hp 8-v92 should run a long time without rebuild. |
larry currier (Larryc)
Registered Member
Username: Larryc
Post Number: 109
Registered: 2-2007
Posted From: 205.188.116.13
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 28, 2007 - 11:04 pm: | |
Robert, Don't overlook the air cleaner. You need a lot of flow. I would start searching the bone yards for a big radiator. Think someone posted about a Mann that would fit if you cut out the left battery box, if that gives you any ideas... I was going to add a radiator to the passenger side of my 05 and use an electric fan. I recently sold that unit though and my Model 20 is much better designed. Ideally this heat should be blown out the exhaust. I'd look for a 35 lb boost turbo to bolt on along with a huge air cleaner, or two medium ones. Also try to get rid of the exhaust restriction and let it pump some air. Someone posted their 92 only had 12 lbs of boost. I don't know if that is factory or not. My DDEC 92 is supposed to push 25 lbs boost and most of my truck engines will pump 35 lbs on a hard pull. I think a 35 lb turbo would really help the heat problem by kicking it right out the exhaust. |
Robert Cox (Bob05)
Registered Member
Username: Bob05
Post Number: 8
Registered: 5-2007
Posted From: 75.0.10.74
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 06, 2007 - 11:38 pm: | |
Thanks to all we bit the bullet today and are haveing the radiator rebuilt. it will be an eight tube dimpilled setup that should disipate the heat. what I found was the old rad. was only five tube. I will surely let all know how it works |