A
Anonymous
I just removed the cam cover, set the crank at tdc mark...
Here is a pic of intake cam dot...
And here is a pic (angled view...) of exhaust dot:
Looks perfectly where they need to be to me!
Now that is starting to look perfectly weird!!!!!
Here is a pic of intake cam dot...
And here is a pic (angled view...) of exhaust dot:
Looks perfectly where they need to be to me!
Now that is starting to look perfectly weird!!!!!
A
Anonymous
Hmmmm no more response....
I guess this is getting way more complicated now...
I guess this is getting way more complicated now...
TurboJamie
TY 4 Stroke God
Any chance of boost leaks,carb leaks, cracked carb boots etc??? Carb caps leaking etc... Can you boost leak test the sled?
A
Anonymous
No chance of leak, we pressurized the vacuum circuit to 30psi and it did not leak a bit....
TurboJamie
TY 4 Stroke God
Did you physically check the engine timing? With a timing light?
powderlites
Expert
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no vac
Big injectors?? Fouled plugs, charge the battery, Install new plugs gap down to 024" set CO to -20 and install My EFI box and put back stock injectors.
Loaded up and won't clean out like carb sled and I have heard this same problem before.
It will run a lot better and more throttle response , Is it a 2006 or 2007?
Big injectors?? Fouled plugs, charge the battery, Install new plugs gap down to 024" set CO to -20 and install My EFI box and put back stock injectors.
Loaded up and won't clean out like carb sled and I have heard this same problem before.
It will run a lot better and more throttle response , Is it a 2006 or 2007?
A
Anonymous
No, I did not.
All that was done to timing was to retard it 2.5 degrees.
I don't see how timing could affect my engine compression since engine is not running anyway.
All that was done to timing was to retard it 2.5 degrees.
I don't see how timing could affect my engine compression since engine is not running anyway.
A
Anonymous
Re: no vac
I can understand its not tuned correctly at this stage...
What do you mean by charge the battery? It is already fully charged.... can my battery connection be not good enough?
I may try to re-install stock injectors just to see if it will get an idle out of curiosity.
powderlites said:
I can understand its not tuned correctly at this stage...
What do you mean by charge the battery? It is already fully charged.... can my battery connection be not good enough?
I may try to re-install stock injectors just to see if it will get an idle out of curiosity.
TurboJamie
TY 4 Stroke God
Forsure if you have biger injectors and don't have enough control over them you will have problems with over fueling. Running rich etc. You could possibly have a bad injector too spewing raw fuel.
For future reference the Apex shop manual states vacuum at idle should be:
27 kPa
205 mmHg
8.0709 Hg
27 kPa
205 mmHg
8.0709 Hg
A
Anonymous
I think I will try to re-install my stockers just to test.
But that doesn't solve the 110psi compression issue.
Can it be possible that the cylinders being washed by too much fuel cause this low compression psi?
But that doesn't solve the 110psi compression issue.
Can it be possible that the cylinders being washed by too much fuel cause this low compression psi?
TurboJamie
TY 4 Stroke God
You can try doing the tspoon of oil trick down each one to seal the rings up better if you believe its blow by.
Need for Speed 2
TY 4 Stroke Junkie
give each cylinder squirt of oil roll engine with plugs out. dont put new plugs in until engine has been cleared of oil after warmed. then check copression. if bat is low it will flood terrible especially with them big squirters. dave is right on the fuel controller you have. order one from him and save yourself alot of headaches. rpm based does not work 3 dimensional controllers are best
A
Anonymous
HAMMER said:
8.07.... so if I get like 5-6 with 9-1 compression ration I guess its good to go?
Well that confirms you have no vacuum leak.
Not really sure, I have no experience to compare it too, all I know is what I get, 4-5-6" vacuum at 70*f/4300ft/stock compression/stock cam timing... The supercharger may be reducing the vacuum a hair also by adding 0.5lbs pressure on the other side of the throttle plates... Some boost must get by them because they obviously are not fully closed... It will be a total pain in the azz but I think I will pressure check/inspect each vacuum line like efiguy said just to be sure I have no vacuum leaks.
If the intake and exhaust are open at the same time (overlap) you can't trap air in the cylinder correctly (low static compression)... The extremely remote possibilities: Collapsed the ring lans trapping the rings, Burnt all the exhaust side front edges of the pistons trapping the rings, or Holed all four pistons... More than likely Dave (Powderlites) has the correct answer, he has tons of hands-on experience.
