|
Author
|
Topic: did a compression test today
|
dean-93
¯
Member # 9401
|
posted
 
 
did a compression test on the 5.0 and got horrible numbers
1#150psi
2#127psi
3#115psi
4#95psi
5#140psi
6#130psi
7#150psi
8#135psi
that should explain why im running a 13.7 with trickflow heads cam and intake
now its time to save up for a 351 shortblock
[ September 09, 2012, 09:58 PM: Message edited by: dean-93 ]
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
turbo50
¯
Member # 6700
|
posted
Re adjust your rockers first....
--------------------
.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
| :
|
|
Greasy
¯
Member # 5258
|
posted
quote:
Originally posted by turbo50:
Re adjust your rockers first....
^This and how did you do your compression test?
--------------------
'93 Cobra-Coyote Powered
'03 DSG Cobra
'13 Dodge Cummins
'14 Rubicon X
Posts: 3272 | From: North Dallas | Registered: Jan 2005
| :
|
|
dean-93
¯
Member # 9401
|
posted
quote:
Originally posted by Greasy:
quote:
Originally posted by turbo50:
Re adjust your rockers first....
^This and how did you do your compression test?
let it warm up for 10 min take all the plugs out then hook up the gauge let it crank over about 5 times and write down the psi
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
dean-93
¯
Member # 9401
|
posted
quote:
Originally posted by turbo50:
Re adjust your rockers first....
thanks for the tip ill probably try that tomorrow
but i think i only preloaded them like a 1/4 turn after u take the slack out
but shit its worth a try
[ September 10, 2012, 01:32 AM: Message edited by: dean-93 ]
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
Duncan Motors
¯
Member # 7045
|
posted
did u disconnect the fuel, from fuel washing your cylinders while cranking? even if not that one is really low.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
| :
|
|
dean-93
¯
Member # 9401
|
posted
quote:
Originally posted by Duncan Motors:
did u disconnect the fuel, from fuel washing your cylinders while cranking? even if not that one is really low.
my fuel pump is wired to a switch and relay and it was off
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
dvuspny
¯
Member # 10949
|
posted
Yeah....re~adjust the rockers. May have a tired set of Lifters.....the worse case could be flat cam now....depends how the initial adjustments were made. Re~check all of this. Take your time.....do it more than once if need be
--------------------
* -DV8- from the just the "norm." *
DVUS MOTORSPORTS ALBUM - http://s1193.photobucket.com/albums/aa349/Dvus_Motorsports/
Posts: 1221 | From: ~BAY AREA~ | Registered: May 2011
| :
|
|
Camara90
1%
Member # 134
|
posted
Like already stated I would check rockers, also what gauge did you use? I used a piece of shit harbor freight one once and it was all over the place. Then purchased a craftsman and it was all to the good.
--------------------
92GT,stock short block,9:1 TFS 170's,perf rpm,custom cam,1 5/8 shorties,C4 trans.
std. 356hp, 350tq
11.85@111.9mph on motor.
Posts: 2351 | From: 707 | Registered: Jan 2001
| :
|
|
turbo50
¯
Member # 6700
|
posted
quote:
Originally posted by Camara90:
what gauge did you use? I used a piece of shit harbor freight one once and it was all over the place. Then purchased a craftsman and it was all to the good.
I had the same issue here with a POS harbor freight comp gauge.
--------------------
.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
| :
|
|
nitrous_bob
CAFords OG
Member # 77
|
posted
did you drop some oil in the bad cylinders...redo and see if they picked up ???? just to verify ????
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
| :
|
|
Ryn621
¯
Member # 11276
|
posted
quote:
Originally posted by Camara90:
Like already stated I would check rockers, also what gauge did you use? I used a piece of shit harbor freight one once and it was all over the place. Then purchased a craftsman and it was all to the good.
harbor freight specialty tools are not great
Posts: 364 | From: 707\510 | Registered: Sep 2011
| :
|
|
Secnd2nun64
¯
Member # 1431
|
posted
go get yourself a leak down tester. it will tell you why the compression is low.
Posts: 1460 | From: CA | Registered: Jun 2002
| :
|
|
dean-93
¯
Member # 9401
|
posted
quote:
Originally posted by nitrous_bob:
did you drop some oil in the bad cylinders...redo and see if they picked up ???? just to verify ????
does that tell you its the rings if it goes up?
ill try that
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
dean-93
¯
Member # 9401
|
posted
i forgot to mention my spark plugs are really really black and car always smells rich
[ September 14, 2012, 05:46 AM: Message edited by: dean-93 ]
--------------------
93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
| :
|
|
lxhatch5.0
¯
Member # 6319
|
posted
quote:
Originally posted by dean-93:
i forgot to mention my spark plugs are really really black and car always smells rich
HHHMMMMMM worn piston rings???? IDK turbo50 might know better, he also rebuilds shortblocks. ![[burnout]](graemlins/burnout.gif)
--------------------
*NorCal
Posts: 1556 | Registered: Dec 2005
| :
|
|
89foxstang
¯
Member # 5908
|
posted
quote:
Originally posted by Secnd2nun64:
go get yourself a leak down tester. it will tell you why the compression is low.
What he said .. It will be much cheaper to buy a leak down tester in the long run than to keep throwing parts at it. You gotta have an air compressor though
Posts: 825 | From: Davis | Registered: Aug 2005
| :
|
|
Email this post to someone!
Printer friendly view of this Ford topic
