Build engine
07-10-2022 | 11:44 PM
#81
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
There honestly is no reason to chase ghosts here. Don't throw parts at a problem until you have isolated the problem.
It has been established that your needles and seats are .120", so there is no reason to point at those as a restriction
You have told us that your WOT fuel line pressure (measured before the fuel line enters the box) is 12 psi and your WOT boost pressure (measured in the intake manifold) is around 6 psi.
As long as your fuel pressure STAYS above (boost psi + 6 psi) then you are NOT experiencing fuel system inadequacies.
Run WOT. Constantly watch the boost pressure and fuel pressure. Whenever the motor feels like it is starving for fuel, TAKE NOTE of those pressures AT THAT TIME.
If the fuel pressure remains steady and doesn't drop as you experience the "starving" issue, then you DO NOT have a problem with fuel supply.
You MUST get this test out of the way and behind you before you know where to focus next.
It may not be a fuel starvation problem at all.
You could have heat-soak which may be triggering ignition detonation. You may have a weak coil or ignition module which loses output when it heats up (under boost at prolonged max revs).
It has been established that your needles and seats are .120", so there is no reason to point at those as a restriction
You have told us that your WOT fuel line pressure (measured before the fuel line enters the box) is 12 psi and your WOT boost pressure (measured in the intake manifold) is around 6 psi.
As long as your fuel pressure STAYS above (boost psi + 6 psi) then you are NOT experiencing fuel system inadequacies.
Run WOT. Constantly watch the boost pressure and fuel pressure. Whenever the motor feels like it is starving for fuel, TAKE NOTE of those pressures AT THAT TIME.
If the fuel pressure remains steady and doesn't drop as you experience the "starving" issue, then you DO NOT have a problem with fuel supply.
You MUST get this test out of the way and behind you before you know where to focus next.
It may not be a fuel starvation problem at all.
You could have heat-soak which may be triggering ignition detonation. You may have a weak coil or ignition module which loses output when it heats up (under boost at prolonged max revs).
07-11-2022 | 04:41 AM
#82
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
There honestly is no reason to chase ghosts here. Don't throw parts at a problem until you have isolated the problem.
It has been established that your needles and seats are .120", so there is no reason to point at those as a restriction
You have told us that your WOT fuel line pressure (measured before the fuel line enters the box) is 12 psi and your WOT boost pressure (measured in the intake manifold) is around 6 psi.
As long as your fuel pressure STAYS above (boost psi + 6 psi) then you are NOT experiencing fuel system inadequacies.
Run WOT. Constantly watch the boost pressure and fuel pressure. Whenever the motor feels like it is starving for fuel, TAKE NOTE of those pressures AT THAT TIME.
If the fuel pressure remains steady and doesn't drop as you experience the "starving" issue, then you DO NOT have a problem with fuel supply.
You MUST get this test out of the way and behind you before you know where to focus next.
It may not be a fuel starvation problem at all.
You could have heat-soak which may be triggering ignition detonation. You may have a weak coil or ignition module which loses output when it heats up (under boost at prolonged max revs).
It has been established that your needles and seats are .120", so there is no reason to point at those as a restriction
You have told us that your WOT fuel line pressure (measured before the fuel line enters the box) is 12 psi and your WOT boost pressure (measured in the intake manifold) is around 6 psi.
As long as your fuel pressure STAYS above (boost psi + 6 psi) then you are NOT experiencing fuel system inadequacies.
Run WOT. Constantly watch the boost pressure and fuel pressure. Whenever the motor feels like it is starving for fuel, TAKE NOTE of those pressures AT THAT TIME.
If the fuel pressure remains steady and doesn't drop as you experience the "starving" issue, then you DO NOT have a problem with fuel supply.
You MUST get this test out of the way and behind you before you know where to focus next.
It may not be a fuel starvation problem at all.
You could have heat-soak which may be triggering ignition detonation. You may have a weak coil or ignition module which loses output when it heats up (under boost at prolonged max revs).
so RIP my 502
07-11-2022 | 06:06 AM
#84
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
...I checked the compresion after this it was 120 psi..My exoust was geting very very hot before this happend steam was going aut...water flow was good new exoust pipes are on the engine new impeler all was good...What could couse the exoust to get that hot(wrong timing or valves)?
07-11-2022 | 07:49 AM
#86
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
07-11-2022 | 08:09 AM
#87
Registered
Joined: Nov 2004
Posts: 14,184
Likes: 3,735
From: On A Dirt Floor
Okay. Oem GenV cast iron rectangular port heads. Should be using a typical .460” reach 14mm thread tapered seat plug.
Being supercharged, i’d run an acdelco mr42t or equivalent.
Possible that those extra long spark plugs you used caused preignition. You could have other tuning issues too, but this is a serious problem.
Being supercharged, i’d run an acdelco mr42t or equivalent.
Possible that those extra long spark plugs you used caused preignition. You could have other tuning issues too, but this is a serious problem.
Last edited by SB; 07-12-2022 at 05:12 AM.
07-11-2022 | 08:32 AM
#88
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
Okay. Oem GenV cast iron rectangular port heads. Should be using a typical .406” reach 14mm thread tapered seat plug.
Being supercharged, i’d run an acdelco mr42t or equivalent.
Possible that those extra long spark plugs you used caused preignition. You could have other tuning issues too, but this is a serious problem.
Being supercharged, i’d run an acdelco mr42t or equivalent.
Possible that those extra long spark plugs you used caused preignition. You could have other tuning issues too, but this is a serious problem.
07-11-2022 | 08:40 AM
#89
Registered
Joined: Nov 2004
Posts: 14,184
Likes: 3,735
From: On A Dirt Floor
Those are just which patern # thst was used (in the Saginaw foundry i believe) info.
The casting # itself (1409788) is what you go by.
Last edited by SB; 07-11-2022 at 08:44 AM.
07-11-2022 | 08:46 AM
#90
Thread Starter
Registered
Joined: May 2022
Posts: 258
Likes: 90
From: Croatia
