Too much compression for boost?????

[Luigi]

Thanks,

I am going to re-tork the head, check the compression again. Then put her back together and try the Napa tester. I have a very bad feeling it is a BHG.

This sucks!!!!!!!:3d_frown:

Just for reference, for future thread searches:

Combustion Leak Block Tester (Part Number - BK. 700-1006)


Taken from here:
http://www.supracentral.com/index.php?option=com_content&task=view&id=25&Itemid=42

 

[IJ.]

<subliminal message> Try the tester NOW <end message>

 

[Luigi]

Now that you mention it, she runs best cold and then get worse as she warms up. I was praying for some type of sensor issue.:3d_frown:

It could be lifting when hot or under boost, as I said earlier grab the test kit from Napa and see if there's combustion gasses in the coolant that will tell you one way or the other.

 

[foreverpsycotic]

check the torque on your bolts/studs?

 

[Luigi]

Will do. If it has a BHG, wouldn't it over heat? It has never over heated???

:aigo:

check the torque on your bolts/studs?

 

[foreverpsycotic]

it is my understanding that it will overheat, ive never gotten BHG (knock on wood) so i wouldnt know

 

[TurboWarrior]

Is the coolant overflow filling/overflowing? losing coolant? Is the upper coolant hose rock hard or close? White froth under the oil cap or rad cap? It overheats if too much coolant is forced out of the rad from compression in the cooling system.

 

[Nick M]

Did you noticet the numbers got higher with each cylinder? You must block the throttle plate open and disconnect the EFI. Otherwise, you turned your test into an increaseing wet compression test.

The later GE cams call for 170 psi for the compression test.

 

[suprarich]

Did you noticet the numbers got higher with each cylinder? You must block the throttle plate open and disconnect the EFI. Otherwise, you turned your test into an increaseing wet compression test.

The later GE cams call for 170 psi for the compression test.

Yep, as I was reading this thread, I was waiting for the "did you pull the efi fuse" question. Sounds like a boost leak in a intercooler pipe to me. If you did not pull the fuse, you need to do your comp test over. Needs to be at operating temp and efi fuse pulled. You can also have a BHG and not show any signs in the coolant if blown between cylinders. your compression numbers give no indication of that however,.

 

[Luigi]

OK, Thanks for all the information. My friend and I just rechecked the comp with all the right procedures per the TSRM and we got way different numbers.

#1 - 160 psi
#2 - 165 psi
#3 - 160 psi
#4 - 162 psi
#5 - 166 psi
#6 - 166 psi

Way better!!!!! Now I plan to do the Napa test jusy to be sure after re-torking the head bolts. They have not been re-torked since the re-build so it can't hurt right?

We also checked all the plug wires. These NGK's are less than 6 Months old and I think they are bad? Here are the readings:

#1 - 130 ohms
#2 - 120 ohms
#3 - 190 ohms
#4 - 300 ohms
#5 - 380 ohms
#6 - 450 ohms

I realize it should be more resistance with the longer wires but this seems really high to me?

I need to get a socket for the ARP's to re-tork them. My buddy with the socket is traveling. Does anyone know the torks socket size for the ARP bolts?

Thanks

 

[Nick M]

Actually, you have the meter scaled wrong or something. Or those are metal core wires. A really good wire can easily be 1500 ohm's per foot. Race wires like MSD are very low, like 50 ohms per foot, but they are not really for street use, and transmit RFI like a mad dog.

Or maybe the NGK wires are just that good.

 

[jdub]

14mm...it's a 12 point deep socket. You might have to use a 3/8" drive with a 1/2" adapter for the torque wrench to get the clearance for the socket to fit in the well in the head.

 

[Luigi]

Thanks, I'm going to get one soon!

14mm...it's a 12 point deep socket. You might have to use a 3/8" drive with a 1/2" adapter for the torque wrench to get the clearance for the socket to fit in the well in the head.

 

[Luigi]

It wasn't scalled wrong but I will check the battery in the meter, I haven't used it in a long time. What kind of resistance is acceptable for MK3 wires?

Actually, you have the meter scaled wrong or something. Or those are metal core wires. A really good wire can easily be 1500 ohm's per foot. Race wires like MSD are very low, like 50 ohms per foot, but they are not really for street use, and transmit RFI like a mad dog.

Or maybe the NGK wires are just that good.

 

[Nick M]

Those numbers are very good.

 

[Luigi]

Yes, you nailed it. I guess I need reading glasses. It was on the wrong scale, just rechecked and they range from 1,2K ohms plug wire 1 to 3.9K ohms for wire 6. Is this considered good???????:aigo:

Those numbers are very good.

 

[Boostedstr8six]

Yes, you nailed it. I guess I need reading glasses. It was on the wrong scale, just rechecked and they range from 1,2K ohms plug wire 1 to 3.9K ohms for wire 6. Is this considered good???????:aigo:

Yes, they are shielded high tension cables. The resistance is much higher than actual wires, which are intended to be low resistance. Using wire conductors to fire spark plugs would result in transmission of RF (radio frequency) and pretty much jamming any other RF signals (ie radio signals) nearby. I think it is actually an FCC violation these days...not that I'm a huge fan of the FCC. IIRC

 

[Luigi]

OK, this makes sense but what is the highest resistance before I need to replace the wires? There must be a max resistance limit?:1zhelp:

Yes, they are shielded high tension cables. The resistance is much higher than actual wires, which are intended to be low resistance. Using wire conductors to fire spark plugs would result in transmission of RF (radio frequency) and pretty much jamming any other RF signals (ie radio signals) nearby. I think it is actually an FCC violation these days...not that I'm a huge fan of the FCC. IIRC

 

[Nick M]

I hate to say it, but don't worry about it. When you develop a miss and it feels like it needs tune up parts, then do the test.

 

[Luigi]

Are you sure that wasn"t a 13mm, I just came home with a 14mm 12 point and it is too big?

14mm...it's a 12 point deep socket. You might have to use a 3/8" drive with a 1/2" adapter for the torque wrench to get the clearance for the socket to fit in the well in the head.