Water Pump Or Head Lift?
 

So on my d16y8, i was getting head lift awhile back and i swapped headgaskets and put in arp headstuds. been running flawlessly for 5 months. Now weather has gotten a hellovalot hotter and its overheating after hard acceleration. No smoke, compression is still 180 alll across, checked the torque on the headbolts, still 62ftlbs. pulled the thermostat to see if that would help but it doesnt. i thought arps were bullet proof so i dont know if its the pump or headlift, and it stays in the perfect spot under normal driving. any advice?

Re: Water Pump Or Head Lift?
 

is the coolant system holding pressure?
does the fan work?

Re: Water Pump Or Head Lift?
 

yes to both

Re: Water Pump Or Head Lift?
 

maybe the head was a bit warped from the beginning?

Re: Water Pump Or Head Lift?
 

yea thats what i was wondering too, but ive been running hard everday like i normally do for 5 months since i put the arps on and i havent had any problems so far.. so hmmm maybe i should juss pulll it off and get it surfaced?

Re: Water Pump Or Head Lift?
 

I would get it surfaced. Check your radiator as well.

I have not once heard of a head lifting with ARPs installed.

Re: Water Pump Or Head Lift?
 

does it burn coolant or pump it into the overflow or anything?

Re: Water Pump Or Head Lift?
 

im loosing coolant, but im not sure where, its not much, maybe half a glass or less after driving around for an hour or two. theres no visible leaks and its exhaust looks normal. the overflow has been full for awhile and it doesnt look like its pulling anything in or spitting anything out, cause im running almost straigt water and the overflow is full from antifreeze that i was running a while ago.

Re: Water Pump Or Head Lift?
 

I have not once heard of a D16 head lifting... despite what people say. I've seen what people call head lifting with ARPs a cou-ple of times. I'm pretty sure used head bolts are just as good as ARP for the <300 whp D16 guys.

With a name like "d16y8crx" I'm 100% confident it's another ignition timing problem. Did nobody get my memo?

Re: Water Pump Or Head Lift?
 

My head was lifting and I'm estimating ~180-200 whp. Popped in some ARPs and the problem was solved.

Re: Water Pump Or Head Lift?
 

Put the thermostat back in. Constant flow will not give the coolant time to disipate the heat while it's in the radiator.

Re: Water Pump Or Head Lift?
 

How much timing were you running, Jon? Did it ever occur to you that the added mechanical clamping action helped with bore shift from detonation... meaning you were still detonating? :-X Ever free up any ring lands?


I've had good luck in the 240 whp range with stock Z6, zero head gasket problems.


Listen to Foowee about thermostats... you need dwell time for the coolant to heat up and cool down, and you need pressure, in order for a cooling system to do a good job.

Re: Water Pump Or Head Lift?
 

good post though, ive been having the same problem and too cheap to do the headgasket route- so i parked it

Re: Water Pump Or Head Lift?
 

JD, about ig timing, its been running perfect for months, and i havnt changed thing, power still feels the same,everything runs hard, juss the heat.. why do you think its the timing?

Re: Water Pump Or Head Lift?
 

I already said why I think you have an ignition timing problem.

Care to share your timing map with us?

Re: Water Pump Or Head Lift?
 

Been running 23.5 degrees of timing at 8 psi for about a year now.

Re: Water Pump Or Head Lift?
 

Holy ----.

General rule of thumb for non D16Y is 14-16 degrees at 10 psi.

Re: Water Pump Or Head Lift?
 

D16y5 head, that count? :D

Re: Water Pump Or Head Lift?
 

I destroyed a D16Y7 once, off less timing than that.

Re: Water Pump Or Head Lift?
 

ill check my timing, but i dont have my map saved anywhere so ill have to find someone with a chip reader. but why would it just start now if its timing and ive been running it hard for a year now? and it will still overheat withought boosting it, like driving on the freeway in 5th, but staying out of boost.

Re: Water Pump Or Head Lift?
 

You breach the headgasket when you vibrate bore, purging coolant into the catch can/reservior. At that point, while everything still seems fine, it slowly degrades. By the time it manifests, you think it's a recent problem, when the problem's been brewing for some time.

Re: Water Pump Or Head Lift?
 

gotcha. ill look into the timing then

Re: Water Pump Or Head Lift?
 

Respect the above JD statement. I personally take it as fact. I also can atest to this fact first hand. Arg...