Compression test results.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Compression test results.
Did a compression check today, brought on by the advice of several people who are helping me trace my low power problems. The truck just feels weaker and weaker as time goes on, plus i get significant blue smoke on startup for a few seconds, and every consecutive time i dyno the number gets lower and lower. These readings are of the engine bone cold, each set 15 seconds or so to stabilize pressure.
Cylinder 1- 390psi
Cylinder 2- 380psi
Cylinder 3- 380psi
Cylinder 4- 380psi
Cylinder 5- 365psi
Cylinder 6- 400psi
Cylinder 7- 400psi
Cylinder 8- 385psi
What do you think?
Cylinder 1- 390psi
Cylinder 2- 380psi
Cylinder 3- 380psi
Cylinder 4- 380psi
Cylinder 5- 365psi
Cylinder 6- 400psi
Cylinder 7- 400psi
Cylinder 8- 385psi
What do you think?
Gone, but not forgotten
Joined: Oct 2005
Posts: 5,026
Likes: 2
From: Charlotte-Fairbanks-Bflo
I don't like this cuz I figure ya probably take good care of it. How many miles on it, what gear ratio and what has been your primary choice for oil? I ask about the miles because 200k with 3.73's would be more like close to 400k with 4.88's.
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Post Fiend
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From: White Mnt's,New Hampshire
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Fall of 06 i was at 309 with 37's, and a TS chip. Felt pretty strong actually. Then spring of 07, went to 33's and DP tuner, made something like 305, but it was on 60% bio diesel. Slipping stock tranny too. Then went to BTS, spent $4600 and then dynoed, something like 304 or 307 like chris said. Fall of 07, Spent 2700 more on Terminator oil pumps, and LIVE tuning. Jody said and felt like my truck had at least 350 in it. Hit the rollers with 305hp.
Spring of 08, it's down back to the 200's.
Oh on a side note- forgot to mention... Twice now when my engine was cold, as in just started up within a few minutes prior, i would accelerate (in stock program) and sometimes catch a shift at 2300-2500rpm, and only twice i would hear a screech noise which i could only explain it sounding like the compressor wheel smacking the housing. Very quick and short. Sure enough today, there were signs of rubbing on the compressor housing, and a nice healthy film of aluminum shavings on the inside of the compressor inlet.
Spring of 08, it's down back to the 200's.
Oh on a side note- forgot to mention... Twice now when my engine was cold, as in just started up within a few minutes prior, i would accelerate (in stock program) and sometimes catch a shift at 2300-2500rpm, and only twice i would hear a screech noise which i could only explain it sounding like the compressor wheel smacking the housing. Very quick and short. Sure enough today, there were signs of rubbing on the compressor housing, and a nice healthy film of aluminum shavings on the inside of the compressor inlet.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
I hope my truck doesn't pull a Jeremy, but i'd like to set it in the shop this fall and build up 5.9 this summer to put in, get it running, recoup the funds, and then add some real horshpower.
