H.o. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 42 (permalink) Old 06-27-2007, 07:07 PM Thread Starter
 
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H.o.

I was wondering if the H.O. injector pump was any better than the S.O.? i know the numbers are Vp4427, S.O. Vp4428 H.O. Whats the bigh difference?:thanks:
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post #2 of 42 (permalink) Old 06-27-2007, 09:57 PM
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The H.O. is actually shimmed down and flows a little less fuel. The H.O. has higher compression to compensate.
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post #3 of 42 (permalink) Old 06-28-2007, 12:08 AM
 
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I didn't think it was that simple, maybe it is, I dunno. I thought maybe the injectors were different maybe?!?!?!?!?
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post #4 of 42 (permalink) Old 06-28-2007, 03:00 AM
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I've heard an HO pump is good for 50hp. I've also heard that they respond better to electronics than an SO too.

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post #5 of 42 (permalink) Old 06-28-2007, 03:19 AM
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A HO pump on a SO engine will run, but the results will not be desireable.

Philly, there is some difference in the injectors but I do not remember what off hand. I do know that Mkoth knows the details if he will chime in. I am thinking the HO injectors have different holes and pop at a different bar than the SO injectors, but I could be all wrong too.
post #6 of 42 (permalink) Old 06-28-2007, 03:26 AM
 
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I think Sean said that at one time, that's why I chimed in. I didn't know for sure I don't have any experance workin on a HO.
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post #7 of 42 (permalink) Old 06-28-2007, 05:25 AM
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the HO pump works at a higher pressure but flows less like everyone else said. HO injectors pop off pressure is higher. Ho's respond better to injectors but worse to electronics.
I had a set of DD2's in my old truck and they gave me 95 hp. where they would give 80 in a SO. An Edge comp will give an HO about 100 hp whereas on an SO it gives 125. there is a point that the SO will do better with BIG injectors because it flows more fuel though

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post #8 of 42 (permalink) Old 06-28-2007, 05:44 AM
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Yeah, I believe the H.O. injectors flow 600cc @ 100bar for 30sec, and the S.O. is 660cc @ 100Bar for 30sec. Thats what comes to mind, but I'm really not 100% certain on that. Like bouncer said, I know MKoth knows. The h.o. pump is also slightly shimmed down, and therefore does not responde as well to electronics, nor is it capable of flowing as much fuel. The S.O. motor runs 16.4:1 compression ratio and the H.O. runs 17:1 compression ratio.

If you are looking for a pump to increase power, get an HR pump don't even bother trying the H.O. you'll be severely dissapointed.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
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post #9 of 42 (permalink) Old 06-28-2007, 12:30 PM
 
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16.3:1 Compression Ratio on a SO
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post #10 of 42 (permalink) Old 06-28-2007, 07:36 PM Thread Starter
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with an HO engine, could you put a SO pump on it and it gain HP
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