Rb26 Throwing Coolant At High Rpm

[BrynDETT]

since upgrading the e85 and -5's my engine has started throwing coolant out of the overflow bottle at high rpm..

i will upload a video and u can see the water coming from the overflow just before rev limiter which is set at 8800rpm..

i had a google and couldn't find anything... it has an rb30 waterpump... is that the "cavitation" problem people talk about?

or does anybody suspect a head gasket / head bolts starting to fail?? as they are both standard...

i will get a compression tester off my boss over the weekend to see if that shows anything..... i wouldn't be suprised if it doesn't though... as this only happens at high rpm..

Edited April 2, 2015 by BrynDETT

[Sinista32]

High RPM, Higher pockets of heat, High Pressure and coolant forcing it's way passed the radiator cap

What radiator cap? 1.3 PSI

Do you use a water swirl pot to let air out of the cooling system ?

[breaker1845]

http://www.sau.com.au/forums/topic/446963-head-stud-torque-pushing-coolant-600hp/

Have a read through that, some one with a similar problem that temporarily resolved it due to head studs.

[BrynDETT]

farout how did i miss that thread like 5 down!?!?! hahah

radiator cap was the first thing i tried, yeah its just a 13psi one 0.9kg...

no swirl pot, just standard silvia overflow bottle...

interesting about the head studs, he was having dramas with the rb25 headstuds.. has anybody else had issues with rb26 headbolts at this power level?

thanks for the replies!

Edited April 2, 2015 by BrynDETT