stock z6 on boost
im pusing a little coolant in the resivour, and my temp gauge goes up a bit

i do pulls in boost and sometimes it wont go up and sometimes it will
i have new oem thermostat, tried 3 rad. caps, coolant is bled out , all grounds are good and ive tried different sensors
comp is 175-180 all 1-4
havent done leakdown just yet, im almost thinking headgasket but its not blowing smoke and temp only goes up every once and a while

 

Head gasket, mine did that a few times before I got it fixed right. It leaked combustion chamber gases into the water jacket under boost, the hot gases going by the coolant temp sensor caused the temp gauge to spike, and they blew some coolant out of the reservoir. A new head gasket would last less than a month, but one of the Cometic HP gaskets lasted for 9 months, it's got a slightly thicker sealing ring around the tops of the cylinders. I eventually pulled the motor and got the block decked to finally fix it, but the HP gasket worked well for me in the interim.

 

yea i was thinking that, but sometimes under boost it doesnt do it

i have a new oem gasket ready to go on, with a little copper spray

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Timmay &raquo;</TD></TR><TR><TD CLASS="quote">yea i was thinking that, but sometimes under boost it doesnt do it

i have a new oem gasket ready to go on, with a little copper spray</TD></TR></TABLE>

1. it could be that the radiator is just too small. or maybe getting "heat soaked" from your downpipe or something..

2. air bubbles....

3. and lastly the headgasket.

 

your probably getting headlift if your on stock head bolts. single cams tend to do that from what ive seen. it would be a good idea to spend $90 on some ARP headstuds and a new headgasket.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CoreyR &raquo;</TD></TR><TR><TD CLASS="quote">your probably getting headlift if your on stock head bolts. single cams tend to do that from what ive seen. it would be a good idea to spend $90 on some ARP headstuds and a new headgasket.</TD></TR></TABLE>

I hadn't thought about that, but it makes sense. My motor was a B16 with ARP studs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CoreyR &raquo;</TD></TR><TR><TD CLASS="quote">your probably getting headlift if your on stock head bolts. single cams tend to do that from what ive seen. it would be a good idea to spend $90 on some ARP headstuds and a new headgasket.</TD></TR></TABLE>

i have arps

im wondering if my radaitor isnt flowing enough or where the cap seals its letting coolant push by when hot then getting air into it
i have a better fan than stock to

 

I've blown a number of headgaskets on my sohc even with arp's with the same exact symptoms you are describing. Its the headgasket i'm 99% sure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">I've blown a number of headgaskets on my sohc even with arp's with the same exact symptoms you are describing. Its the headgasket i'm 99% sure.</TD></TR></TABLE>

yea thats how my last setup was but the temp doesnt go up everytime i boost like it has before

 

It might start getting worse. No way of telling yet.

 

another thing is my rad cap was loose so i squeezed the tabs a little and it doesnt seem to push much coolant but still gets warm sometimes
doing the headgasket isnt a problem, 1 hr worth of work i just dont want to replace it yet if not needed

 

Yea its a pain in the *** when changing the gasket gets to be a regular thing you do every 3500 miles

 

well if anyone else has ideas of something other than the headgasket
post it up

95% that is my prob though