So I just finished my g35 built bottom, went this weekend to dyno. The car made 600wrhp on mustang dyno at 15lbs @ 12deg timing. After 12 pulls or so It pushed a little water out the over flow and it was getting late so we called it a day on the pump gas tune. I took the car home burped the cooling system very well then took the car up the road ran fine until I made a hard 4th gear pull, push a ton of coolant out.I checked the data log no knock and I even bought 10gal of 104oct put it in the car, refilled the cooling system and tried it one more time same result. My specs are below what the hell could have cause this ?
Pulling the motor back out tonight to see if I can find the issue, Tx2K is coming fast

L19 Head Studs tq@ 95lbs in factory sequence
Darton Sleeves
Cometic Head Gaskets
block has RA 50 finish
haltech ecu
1600cc inj
jwt c8 cams
76mm precision

 

something is cracked/blown. cometic headgaskets suck btw.

 

Darton sleeves FTL and it sounds like head lift.

 

Darton sleeves FTL ? They seem to work in everything else iv used them in.

 

The VQ dosent seem to take well with the sleeves.Check on my350z and do some research and youll find out more.

 

Who installed the sleeves?

 

Darton sleeves on west coast installed them.

 

Chances are one or more of your sleeves slipped down and that's why air is getting pushed into your system...I really doubt it's headlift with the L19's. The only way this can really happen is do to improper machining/install of your sleeves which seems to be a fairly common issue with Dartons the VQ...sorry to hear this .

If you plan to rebuild I'd say stick with the stock sleeves... 600whp is not sleeve territory IMO...

 

what he said /\ sounds expensive

 

Sleeves dropped, welcome to my world . Darton West coast is supposed to be the best place to take your engine to get it sleeved

Mine did the exact same thing, I tried a Cometic Phuzion head gasket and that never even helped. If you are going to stick with the sleeved engine get you block decked and the heads plained. It "may" fix your issue.

Good luck and let up know what you do and how it turns out.

 

I will pull the motor tonight and check, I'm hoping for 900whp with spray and the 76 billet easy, if not I'm going to scrap this POS Motor and stick my LSX motor in it.

 

I tried these head gaskets but they didnt help either, I still pushed coolant. They were about $500 for them so i doubt I will use another set

If I try with sleeves again i will deck the block plain the heads and run a standard Cometic HG.






I sent the heads away and had them plained



Here are the new HG that are cut for the 1/2" head studs being installed the rings go in last.

without the ring in the middle cylinder



installing the rings



ring installed

 

Here is the gasket that I ordered. http://www.powerenterpriseusa.net/pr...et/gasket.html
There on some high hp cars running fine. I'm going to put a few coats of copper coat on them as well. I'm going to have the block checked and put another ra50 finish on it, have the heads rechecked for cracks and have a ra50 finish put on them as well. other than that I'm not sure what ells I can do.




http://www.powerenterpriseusa.net/pr...et/gasket.html

 

Took the motor apart and laid a straight edge across the cylinders and it looks like the left side sleeves have moved. you can rock the edge back and froth on the left side and on the right side it sits flat. The machine shop is going to call me today let me know what happened. I hope darton did no screw up

 

^^ there you have it... add yet another low hp sleeve failure to the list

VQ + sleeves = fail (even when darton does the sleeves!!)