are these high mat temps??

[SeattleSy#1255]

are sure you are not seeing false knock??? Have you made sure that you do not see knock when you rev the engine in neutral?

As for your IC, I have a strange issue with mine where it will not self-purge air pockets.. I actually have to use an external pump to pump coolant through the system and push the air pockets out..

To do this I cut my rubber coolant return hose (heading down to IC) near the cruise control unit.. Then I put a female garden hose connector on the lower half of the hose and a male connector on the upper half..

I use a submersible pump in a 5 gallon bucked of water/antifreeze to push coolant through the system. I force it down through the lower IC, through the pump and back up to the upper IC.. I use a short piece of hose to route the exiting coolant back into the 5 gal bucket.. after the bubbles stop I crimp the hose(using a clamp) as close as possible to each garden hose connector, screw the hoses back together and remove clamps..

My IC system works VERY well.. I have removed my EGR system and I have an ultimate chip so I don't have that egr warming everything up problem..

The IC stays cold to the touch(even after a run) and the Intake just gets warm.. I haven't hooked up diacom in over and I don't remember what my temps were... I think good numbers are 10-15 degrees over ambient..

My IC system does not develop air pockets unless I remove the cap.. If I remove the cap a good amount of coolant spills out and I develop air pockets again..

I do not understand the air pocket problem as the IC is the highest point in the system.. It should work OK filling it from there..????

BTW, I smoked a GT last weekend and I plan to post the video as soon as I figure out how to convert uncompressed AVI files to DivX..

-Matt

The IC is the High point of the system, but the pump is not, --that is the problem.

 

[leroy]

I have a simple method to get all the air out, but you must have the hoses routed properly.

Route all the hoses so you can unbolt the intercooler and set it aside without disconnecting hoses. This is a good idea for when you have to change spark plug wires, valve cover gaskets etc.. Fill the intercooler while it is unbolted. Raise the intercooler and tip it backwards to let gravity do it's work. Run the pump as needed while filling to get out the last few air pockets.

Jim

 

[typhoon-crazy]

i redid all the ic lines and put in my griffin lower cche. im pretty sure i had a couple kinks in the lines and now my mat's are at about 90* when im cruising at about 30mph. tried goin wot and had only 1 degree of knock retard on T1-17. didnt have a chance to look at my mat's though. looks like the problem is solved. thanks for all the help.

 

[turbodog]

On my dual-heater core aux CCHE setup, I had a hard time purging even with the dual pumps until I unbolted the upper IC, disconnected it from the TB, and tilted it at a 30 degree angle or so (filler neck up, in/out hose fittings down).

Prior to that, I could see the air pockets moving thru the clear section of hose, but they would never emerge at the filler neck. With the IC tilted, it purged in about 2 min. Big burps. I'm sure the very healthy flow provided by the dual pumps helped, but tilting the IC was the real key.

BTW, my MATS are running 90 - 100 DF at WOT on a 80 DF day. At cruise, "MAT" will essentially rise to coolant temp because the MAT sensor is not thermally isolated from the manifold at all (and the manifold is being heated by the EGR). IOW, without strong airflow, the heat conducted into the sensor drowns out the air temp signal you're looking for. This is discussed at length in old mail list archives, circa 1995.

But, it's the WOT charge air temp you are most concerned about.

I *was* tempted to try and insulate the MAP sensor, but hated the thought of drilling the hole larger to fit in a plastic (delrin, etc.) bushing. Then read the old posts. According to "dig", the fueling and spark maps don't vary with MAP except when it goes to extremes. So, no real benefit, other than having MAP readings more indicative of charge air temps at cruise.

HTH,