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Dodge Competition and Performance General Dodge Competition and Performance Discussion |
09-19-2019, 08:46 PM
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#81
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Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
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Checked compression and did a leakdown test on each cylinder. Checked it with the motor cold and hot.
Cold compression was 370psi on cylinder 1 and 6. 320psi on 2, 4, and 5, and 280psi on 3.
Checking it hot all the readings just went up about 10-15psi
Now when I did the leak down at 100psi cylinders 1 and 6 held 90psi.
But 2, 3, 4, and 5 only hold 45-55psi. There’s a pretty loud hiss coming out the exhaust. No hiss out the intake, no bubbles in the radiator, and nothing terrible coming out the crankcase breathers either. Cylinder 1 and 6 there was no hiss.
I searched a bit but didn’t find an exact spec for compression. I didn’t think that was too bad, the motor just not has 130k on it and it’s only been abused for about 2k miles.
Could it be exhaust valves not sealing contributing to my issue?
I still need to try another set of governor springs it it too
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
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09-20-2019, 05:32 AM
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#82
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Name: MufflerBearing
Title: Too Much Time
Status: Not Here
Join Date: Oct 2008
Location: Boyertown, PA
Member`s Gallery
Posts: 1,188
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Quote:
Originally Posted by Scattered
Checked compression and did a leakdown test on each cylinder. Checked it with the motor cold and hot.
Cold compression was 370psi on cylinder 1 and 6. 320psi on 2, 4, and 5, and 280psi on 3.
Checking it hot all the readings just went up about 10-15psi
Now when I did the leak down at 100psi cylinders 1 and 6 held 90psi.
But 2, 3, 4, and 5 only hold 45-55psi. There’s a pretty loud hiss coming out the exhaust. No hiss out the intake, no bubbles in the radiator, and nothing terrible coming out the crankcase breathers either. Cylinder 1 and 6 there was no hiss.
I searched a bit but didn’t find an exact spec for compression. I didn’t think that was too bad, the motor just not has 130k on it and it’s only been abused for about 2k miles.
Could it be exhaust valves not sealing contributing to my issue?
I still need to try another set of governor springs it it too
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What for camshaft are you running?
Sent from my SAMSUNG-SM-G891A using Tapatalk
__________________
17' Mega 3500 W/Aisin, 2nd gen swap with billet S468
87' 4runner LS, NV4500, 1 Tons.
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09-20-2019, 05:54 AM
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#83
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Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
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188/220 Hamilton
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
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09-20-2019, 06:31 AM
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#84
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Name: zachu812
Title: Too Much Time
Status: Not Here
Join Date: Apr 2016
Member`s Gallery
Posts: 419
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Forgive me for not reading through the whole thing, but has the head ever been off and checked? I was chasing my tail trying to figure out why my truck was down on power all last summer. Still ran ok but it wasn't how it should've been, boost was only down about 10psi from normal and had no leaks elsewhere. No matter what I did it wouldn't clean up and I had more than enough air. Compression test showed 1 & 6 about 50 psi higher than the others and they all had more leak down than I would've liked. Ended up pulling the head and found about a dozen cracked valve seats, new head and it was back to normal. Might be worth a check at this point.
__________________
1995 RCLB 4x4: H-pump, 5x.012s, HX35
2001 RCLB 4x4: H-pump, 6x.013s, S472/S488
EdzGarage, Matt's Diesel Supply, HTS Transmissions
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09-20-2019, 08:40 AM
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#85
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Name: Scattered
Title: Green Behind the Ears
Status: Not Here
Join Date: Nov 2016
Location: Pittsburgh, PA
Member`s Gallery
Posts: 82
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Quote:
Originally Posted by zachu812
Forgive me for not reading through the whole thing, but has the head ever been off and checked? I was chasing my tail trying to figure out why my truck was down on power all last summer. Still ran ok but it wasn't how it should've been, boost was only down about 10psi from normal and had no leaks elsewhere. No matter what I did it wouldn't clean up and I had more than enough air. Compression test showed 1 & 6 about 50 psi higher than the others and they all had more leak down than I would've liked. Ended up pulling the head and found about a dozen cracked valve seats, new head and it was back to normal. Might be worth a check at this point.
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Nope the head has never been off this engine since it was new. Sounds like your leak down results were the same as mine. Since there’s a pretty loud hiss coming out the exhaust I’m betting it does have bad valve seats. It’ll be coming off this winter for sure.
__________________
2001 QCSB- castrated puller, back to “stock”.
2002 QCLB- Tow pig
2001 QCLB- WS/2.5 P24v
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