Exhuast valve springs for dta360? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 14 (permalink) Old 07-05-2009, 02:05 PM Thread Starter
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Exhuast valve springs for dta360?

Hey everyone,
Last summer i installed a universal pacbrake exhaust brake in my 91 IH 4700. It works well at 3k RPM, but strength falls off fast. I have it set to 36-38 psi max backpressure now, but I know on the 5.9 cummins it can be 60 with upgraded valve springs. By any chance do those work for this engine? The trouble is, it not very efficient over a wider rpm range. Thanks.
Mike
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post #2 of 14 (permalink) Old 07-05-2009, 08:48 PM
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I'm not sure if they are the same spring. You can call Hypermax, and get the ones they recommend.

Dale

my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
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post #3 of 14 (permalink) Old 07-06-2009, 01:59 AM
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Another thing to consider is I would bet the NGD series DT360 (if they made one) probably had stiffer valve springs because I'm pretty sure the NGD 466 & 530 had an available exhaust brake. One could probably bet that the DT360 did as well.

How is the ex brake working for you?

I really want one, but from what I hear the backpressure has to be set too low to really be effective. Set it too high and you've got damage.

I also feared the butterfly valve would push my EGT's up ~100 degrees because of downpipe blockage.

With all the DT466/360/530's out there, you'd think Pacbrake and the rest would offer a valve spring kit to get them set up correctly so an exhaust brake would be effective.

Then they could sell thousands more exhaust brakes!
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post #4 of 14 (permalink) Old 07-06-2009, 12:26 PM Thread Starter
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Like I said, it works well if your are revved. I came down a pretty good grade, dont know %, towing a 26 ft. box truck around 18K, and it held decent. Its just when you slow to 2500 rpm it looses efficiency and doesn't work as well. My temps didnt raise much, i can hit 1300 loaded if i keep my foot in it for 20 sec up a hill, running about 28psi. Also, what is a NGD motor? It would just be sweet if at 3K it had 60 psi, and 2K it had 30. Ill call hypermax today.
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post #5 of 14 (permalink) Old 07-07-2009, 03:22 AM
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NGD= Next Generation Diesel. I don't recall exactly when the change occurred.

1996 Int 4700, 175hp DT466, 5 speed, 2x rear end, service body

2001 F350 SRW flatbed, 4x4, crew cab

1978 International F2275 Dump Truck

1996 NH LX665, steel tracks on foam filled tires

2005 Tackeuchi TB145

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post #6 of 14 (permalink) Old 07-07-2009, 03:39 AM
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~'95-'96 NGD's hit the scene.

You can get the stiffer springs, but then you gotta dig into the valve cover.

Might be a good thing to do when you're up against a valve job. I think you're supposed to check 'em or do every 75K.
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post #7 of 14 (permalink) Old 07-07-2009, 04:05 AM
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The NGD on the 408/466/530 started in 93. The 360 ended in 93, and didnt get the NGD treatment.

Dale

my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
www.freewebs.com/nevrenufhp
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post #8 of 14 (permalink) Old 07-07-2009, 12:20 PM Thread Starter
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Well, hypermax doesnt necessarily have a spring for my application, but they do have a double spring which they use on the race motors spinning 5K. I called my local dealer and I can get 6 stock springs for the 360 for $35, which I then could measure seat and lift pressures at the local machine shop. This would also let me get exact measurements and possibly compare them to other springs. I dont know why others have not tried this, i think the 360 is a good engine, when turned up of course. All i have to do now is still get rid of my preboost smoke issue.
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post #9 of 14 (permalink) Old 07-08-2009, 01:59 AM
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Quote:
Originally Posted by nevrenufhp View Post
The NGD on the 408/466/530 started in 93. The 360 ended in 93, and didnt get the NGD treatment.
I've seen 94 IH DT's that were not NGDs!!

I've also seen 2000 IH's with MT series Allison transmissions nad '99 IH's with more advanced MD series electronic Allisons.

I went to Florida to look at a 2001 GMC 4x4 with a MT653 in it. MD's were in trucks by then.

Trucks are weird like that.

Last edited by Duke; 07-08-2009 at 02:02 AM.
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post #10 of 14 (permalink) Old 07-08-2009, 02:12 AM
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Quote:
Originally Posted by mrod67 View Post
Well, hypermax doesnt necessarily have a spring for my application, but they do have a double spring which they use on the race motors spinning 5K. I called my local dealer and I can get 6 stock springs for the 360 for $35, which I then could measure seat and lift pressures at the local machine shop. This would also let me get exact measurements and possibly compare them to other springs. I dont know why others have not tried this, i think the 360 is a good engine, when turned up of course. All i have to do now is still get rid of my preboost smoke issue.
There's a degree of difficulty to modifying DT's like you would a 7.3, a DMAX, a 5.9 Cummins in a pickup. Usually there's a "bottleneck" in every series of DTs. Mine is the pump. The plungers & barrels are just too small for anything more than minor streetable modification-maybe 30-50 more HP if you're lucky.

I would love to have 300 SAFE low-EGT, workable HP so I can still safely haul a 10 ton load. I don't want to race my truck or limit it to an empty truck running 1300* EGT on a drag strip.

Hypermax (Jeff or Ron) will tell you straight-up, when it comes to DTs, they are in the business of 1000-2500 HP DT's for tractor pulling. They offer nothing much more than their condolences to you when you want "streetable/useable" milder HP levels. They guys at Hypermax are the best, but they just don't have much other than some advice.

I wish it were different, but I've spoke with Jeff more than 10 times about this very subject.

If you have a pre-boost smoke issue, I would think turning the star (smoke) screw back a few turns might help, but I'm not sure which pump you have.

Let me know what you come up with on stiffer valve springs. I'd love some extra braking power from a PAC brake. I bet a lot of older DT owners would love more, too. I'm close to needing a valve adjustment, so it would be a great time to do it.

Last edited by Duke; 07-08-2009 at 02:14 AM.
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