Preventing HGF.....

Rich H · Post by **Rich H** » Tue Oct 02, 2007 10:20 am

Coolant doesn't all boil, just locally around hotspots.

BiggestNizzy · Post by **BiggestNizzy** » Tue Oct 02, 2007 10:27 am

I'm just thinking that 1ml of water produces 1l of steam so if you have it boiling then the pressures will fairly mount up If memory serves me right you need to be 120C+ for it to boil.

Rich H · Post by **Rich H** » Tue Oct 02, 2007 10:43 am

But I would imagine that surface temps of the liners could reach that. I don't understand how boiling coolant can affect the head.

BiggestNizzy · Post by **BiggestNizzy** » Tue Oct 02, 2007 11:01 am

Boiling can cause* oxidisation. (pitting) of the head as far as I am aware the shim helps reduce that

.

*cause is a harsh word it's more like creates ideal conditions metals oxidize faster in hot water.

Edin430 · Post by **Edin430** » Tue Oct 02, 2007 5:23 pm

PRRT??

BiggestNizzy · Post by **BiggestNizzy** » Tue Oct 02, 2007 5:28 pm

X7LDA wrote:PRRT??

Pressure Releif Remote Thermostat

http://wiki.seloc.org/a/PRRT

Lawrence · Post by **Lawrence** » Tue Oct 02, 2007 5:39 pm

RICHARDHUMBLE wrote:But I would imagine that surface temps of the liners could reach that. I don't understand how boiling coolant can affect the head.

It's the air bubbles letting the temp rise locally and preventing cooling

BiggestNizzy · Post by **BiggestNizzy** » Tue Oct 02, 2007 5:46 pm

If you made it super super clean and used distiled super clean water you wouldn't get any bubbles and you could super heat the water without it boiling, but that may be difficult

caleebra · Post by **caleebra** » Tue Oct 02, 2007 9:07 pm

Preventing HGF.....

buy a VX

Seriously though, keeping an eye on these threads now since I have a VVC in the family

albeit not in a Lotus

The one we bought had in May, at a cost of £1700, a spanking new cylinder head fitted with the LR gasket & steel dowels after valve guides had fallen out

BiggestNizzy · Post by **BiggestNizzy** » Tue Oct 02, 2007 9:18 pm

I have had 2 1.4's and never had any trouble, my parents 1.6 (although I think that is stroked not bored) went through 2 gaskets before rover replaced the whole engine on warrenty

, my sister's bf had his head gasket done on his freelander and my elise has had it done. but I know 3 ppl with 1.8's in 75's/Zt with no problem, a freelander with PRRT (when he bought it he got the dealer to fit it for free) no probs I don't think they are as bad as everyone makes out, as long as you warm them up and fit a PRRT and maybe even an electric water pump that works on a timer once the engine has been switched off.

VXJON · Post by **VXJON** » Tue Oct 02, 2007 10:15 pm

caleebra wrote:Preventing HGF.....

buy a VX

Dominic · Post by **Dominic** » Tue Oct 02, 2007 10:18 pm

VXJON wrote:
caleebra wrote:Preventing HGF.....

buy a VX

John, You would be

One of the girls in the Uni motor sport club arrived tonight; having just had HGF in her MGF

.... always said she should have bought a Liz

caleebra · Post by **caleebra** » Tue Oct 02, 2007 11:12 pm

BiggestNizzy wrote:no probs I don't think they are as bad as everyone makes out, as long as you warm them up and fit a PRRT and maybe even an electric water pump that works on a timer once the engine has been switched off.

lol, anything else you need to do to make the engine fit for purpose?!

Stu160 · Post by **Stu160** » Tue Oct 02, 2007 11:54 pm

caleebra wrote:Preventing HGF.....

buy a VX

I have skimmed quite a lot of ecotec heads as well,they are not without failure,they just dont get driven as hard

They are looked after better by the cast iron block.

Stu

caleebra · Post by **caleebra** » Wed Oct 03, 2007 8:50 am

Stu160 wrote:
caleebra wrote:Preventing HGF.....

buy a VX

I have skimmed quite a lot of ecotec heads as well,they are not without failure, they just dont get driven as hard

They are looked after better by the cast iron block.

Stu

Only the lardy turbos have a cast iron block though... the 2.2 is alloy