[Z06] LS7 MSD intake / loose injectors
#1
Melting Slicks
Thread Starter
LS7 MSD intake / loose injectors
Basically when I go to push my injectors into the bores they get down to the level where the intake seal is and then there is a bit of a void ( a small gap separated by the gasket between the clam). The injectors are tight until they get to this position which is fully seated. They are very loose and would not hold a vacuum.
Has anyone seen this? What did you do? Obviously bigger o-rings would be a possible solution. The stockers are pretty tight in the bores before they get to that gap so how much bigger I don't know and who would you call to order them.
So frustrated with the extremely low quality of the MSD intake. I mean damn. I feel like I'm back in 1970 when aftermarket meant "half assed and good luck"...
Has anyone seen this? What did you do? Obviously bigger o-rings would be a possible solution. The stockers are pretty tight in the bores before they get to that gap so how much bigger I don't know and who would you call to order them.
So frustrated with the extremely low quality of the MSD intake. I mean damn. I feel like I'm back in 1970 when aftermarket meant "half assed and good luck"...
#3
Melting Slicks
Thread Starter
I am just hoping its an easy fix that I am making more difficult than it has to be. I cannot be the only person to experience this.
#4
Burning Brakes
#6
Burning Brakes
#7
Melting Slicks
Thread Starter
Like I said, they are really tight in the bores going into the intake. Its when they are seated, they are loose. No tension at all on several of them.
#8
Melting Slicks
Thread Starter
I plan on calling MSD tomorrow when they open. I am just not looking forward to what they may tell me. I have a decent amount of money invested in the porting and direct port nitrous setup...
#9
Burning Brakes
I just placed an order for a mamo msd a few min ago lol. I hope I don't have this problem. Tony has the most experience with these. I'd ask him.
#10
Safety Car
Wont do any good.
Your injectors should seal in the plastic bore before they bottom out.
What you are feeling is,,,,,, your pushing the injector oring past its sealing point and there is a gap right now where the clamshell injector gasket is.
I would bet your installing them off the car.
Once you install the manifold the 10 manifold to head bolts tighten up that slack and shorten that gap greatly.
Once its tightened the injector will bottom out AND the Oring will still be in the bore sealing as it should.
Have any questions PM me, but you will see what I'm talking about after its installed.
The following 2 users liked this post by outhouse:
Matt Zed (03-03-2022),
User Omega (02-21-2017)
#11
Melting Slicks
Thread Starter
Wont do any good.
Your injectors should seal in the plastic bore before they bottom out.
What you are feeling is,,,,,, your pushing the injector oring past its sealing point and there is a gap right now where the clamshell injector gasket is.
I would bet your installing them off the car.
Once you install the manifold the 10 manifold to head bolts tighten up that slack and shorten that gap greatly.
Once its tightened the injector will bottom out AND the Oring will still be in the bore sealing as it should.
Have any questions PM me, but you will see what I'm talking about after its installed.
Your injectors should seal in the plastic bore before they bottom out.
What you are feeling is,,,,,, your pushing the injector oring past its sealing point and there is a gap right now where the clamshell injector gasket is.
I would bet your installing them off the car.
Once you install the manifold the 10 manifold to head bolts tighten up that slack and shorten that gap greatly.
Once its tightened the injector will bottom out AND the Oring will still be in the bore sealing as it should.
Have any questions PM me, but you will see what I'm talking about after its installed.
You are correct. I will install it on the car to see how it works out.
#13
Melting Slicks
Thread Starter
If you look at this image you can see the gasket that goes between the clam. You can see that the injector bores are actually 2 pieces. An upper and a lower. The gasket isn't very thin and doesn't fit the bore perfectly so what is happening here is that even though I have all of the outside bolts tightened down, the clam isn't clamping fully on the gasket that goes in between the bore sections. When I install my injector into the bore (off of the car), it presses down to where the gasket is and there is a gap there allowing the injector to be loose.
What outhouse is saying is that when you install the intake mounting - head bolts, it will clamp the gasket down and decrease the gap where the gasket is. Thus keeping the injector in the bore of the upper part of the clam because the injector will bottom out before getting into the gap area. I am hoping that this is my problem and it does seem logical. I will return with feedback either tonight or tomorrow night.
What outhouse is saying is that when you install the intake mounting - head bolts, it will clamp the gasket down and decrease the gap where the gasket is. Thus keeping the injector in the bore of the upper part of the clam because the injector will bottom out before getting into the gap area. I am hoping that this is my problem and it does seem logical. I will return with feedback either tonight or tomorrow night.
The following users liked this post:
Matt Zed (03-02-2022)
#14
Safety Car
You have it down cold, that is exactly what I was trying to say.
You will see with the clamshell bolts loktighted that the injector gasket is actually loose off the car and you can move it around almost freely with a small screwdriver.
Once its bolted on the car its gets squished at that point, to the point of you did not deburr the casting marks on the injector seat you will end up cutting the clamshell gasket.
You will see with the clamshell bolts loktighted that the injector gasket is actually loose off the car and you can move it around almost freely with a small screwdriver.
Once its bolted on the car its gets squished at that point, to the point of you did not deburr the casting marks on the injector seat you will end up cutting the clamshell gasket.
#16
Drifting
I have run into that issues.... Buy fast injectors spacer. Used them, that will seal properly.
Do 4 aluminum spacers to jack up the fuel rail the same level. A bit of job, but that work perfect.
Hope this help,
Seb
Do 4 aluminum spacers to jack up the fuel rail the same level. A bit of job, but that work perfect.
Hope this help,
Seb
The following users liked this post:
MTPZ06 (02-23-2017)
#17
I could tell a difference when installing fuel rain with intake on the car versus off the car. Plus putting on the fuel rail after the manifold is already installed gives a little more room for the two rear manifold to head bolts...at least for me it was much easier to get to them and tighten
Last edited by ChevyCobb; 02-22-2017 at 03:11 PM.
#19
Melting Slicks
Thread Starter
Yes, I also did my FAST rails off the car. Much higher quality there. I did not get to installing the intake the last couple days. A slight delay here figuring out the steam vent deal.