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jiptwoo
Joined: 29 Aug 2005
Posts: 118
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| Posted: Thu Nov 23, 2006 1:45 pm Post subject: Dyno's |
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| I have seen G-man write that you can get a decent truck for about 20 grand and some with rebuilds, and I have been checking and he is right. I know not to buy a truck without getting a dyno, my question being! What exactly does a dyno tell me? |
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yoopr
Joined: 01 Dec 2004
Posts: 12866
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| Posted: Thu Nov 23, 2006 3:00 pm Post subject: |
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Basically a Dyno Test is for Tuning your engine
checks oil pressure-Horsepower-and blow by
Test is under load |
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bob h
Joined: 15 Oct 2006
Posts: 664
Location: Nb
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| Posted: Fri Nov 24, 2006 7:57 am Post subject: Re: Dyno's |
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jiptwoo wrote: I have seen G-man write that you can get a decent truck for about 20 grand and some with rebuilds, and I have been checking and he is right. I know not to buy a truck without getting a dyno, my question being! What exactly does a dyno tell me?
As yoopr stated ; a dynamometer is used to place an engine under a load (simulate a hard pull) and then measure horsepower potential.
HP to the ground ; chassis dyno.
Flywheel HP ; engine dyno. |
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korn74
Joined: 03 Dec 2006
Posts: 2
Location: Wisconsin
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| Posted: Sun Dec 03, 2006 10:03 pm Post subject: |
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| Most dyno's can gather a whole bunch of data. It depends on what you want to spend for the Dyno run. When buying a used truck you would want a power run with blowby and horsepower. You should also make them give you a print out with ecm miles if it is an electronic engine. |
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sidman82
Joined: 21 Jun 2006
Posts: 395
Location: Long Island,NY
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| Posted: Thu Aug 30, 2007 12:28 pm Post subject: |
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I am looking at a truck with C-12. Need help reading Dyno.
As I put in my other post. It has .2 - 1% blow by. Is this decent for a 2003 with 500K miles. At 1550 rpm it had 371hp & .775 blow by. 37.5 psi oil pressure and 20.8 lbs of boost. |
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silvan
Joined: 24 Mar 2006
Posts: 803
Location: Working at Wal-Mart.
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| Posted: Fri Aug 31, 2007 7:36 pm Post subject: |
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| Anyone want to throw in here an answer to "what is blowby?" I'm not sure what this means. |
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9200IH
Joined: 27 Jan 2006
Posts: 139
Location: Mid Michigan
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| Posted: Fri Aug 31, 2007 9:24 pm Post subject: |
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| When you piston rings or cylinder liners wear, a small amount of compression will get past the rings and go into your crank case. And this is called blow by. This is ussaully piped out of the valve cover and then headed down towards the ground with a steel pipe and then a rubber hose. |
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bob h
Joined: 15 Oct 2006
Posts: 664
Location: Nb
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| Posted: Sat Sep 01, 2007 5:18 am Post subject: |
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9200IH wrote: When you piston rings or cylinder liners wear, a small amount of compression will get past the rings and go into your crank case. And this is called blow by. This is ussaully piped out of the valve cover and then headed down towards the ground with a steel pipe and then a rubber hose.
a small amount of blow-by is normal
the rubber hose is often added by... someone after it leaves the manufacturer. the extra length can pull a lower than desired crankcase pressure that can cause a sort of "backdraft" intermittently which causes road debris ingestion..... not recommended. i've seen dusted engines refused warranty due to this add-on..... course, i've also seen the hoses added by certified dealers as a method of getting the blow-by oil drip off the i-beam, so................... |
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silvan
Joined: 24 Mar 2006
Posts: 803
Location: Working at Wal-Mart.
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| Posted: Sat Sep 01, 2007 9:59 pm Post subject: |
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| 9200IH wrote: This is ussaully piped out of the valve cover and then headed down towards the ground with a steel pipe and then a rubber hose. 10-4. |
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vontrial
Joined: 25 Aug 2006
Posts: 87
Location: MS
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| Posted: Tue Sep 04, 2007 9:42 am Post subject: |
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| When is a good time to get a dyno run on truck.I have a 2000 Frtliner with a Det.470 with 812,000 mileage. No problem out of truck just would like to know if I should have it done. |
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silvan
Joined: 24 Mar 2006
Posts: 803
Location: Working at Wal-Mart.
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| Posted: Wed Sep 05, 2007 6:45 pm Post subject: |
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| vontrial wrote: When is a good time to get a dyno run on truck. Before it needs it. :) |
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allan5oh
Joined: 26 Aug 2005
Posts: 2127
Location: jackassville (winnipeg, mb)
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| Posted: Wed Sep 12, 2007 6:58 pm Post subject: |
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vontrial wrote: When is a good time to get a dyno run on truck.I have a 2000 Frtliner with a Det.470 with 812,000 mileage. No problem out of truck just would like to know if I should have it done.
I wouldn't bother.
Oil analysis will be much more cost effective, and tell you more. |
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