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This post is as an update. The cause of problem = bad thermostat. Problem completely solved by removing it, which was easy to do thanks to the gas research straight-gas setup providing extra room to work in. All this also means that both main radiator hoses being firm once warm...

Re: Water Pump - when running the engine with the lid taken off the surge tank bottle, there is a steady stream of coolant coming out from the air bleed hose (the very top thin hose of the tank) including at idle. Also, when revving the engine by hand slightly, there is a lot of turbulence in...

Here is what I KNOW from experiencing it in practice. Petrol = higher coolant temp reading than gas. Gas = higher ambient heat coming off engine and hotter + more-volume-consuming exhaust gases. And the LPG by the time it enters the throttle body isn't really cold anymore...

135psi. It's actually a (new) cap on the phase 1 of series 1 surge-tank bottle (which is also new). Today I dumped all the coolant and replaced it with 100% ethylene glycol again, so at least it won't boil anymore after shutting off the engine.

LPG actually burns hotter than petrol. Many people assume it is weak and cold. Both the top and bottom main radiator hoses are firm (but not rock hard as is the case if there's a secretly split hose for example). I believe if both hoses are hard, this means that the thermostat is open...

Would anything like "water injection" or a cold-air ram-air intake etc cause a considerable reduction in "coolant temp"?

I thought about that a while ago and to try to find out I connected a laptop to the diagnostic connector of the car's computer unit. The temps seemed to match the temp gauge. Also on the hot day after turning off the engine in the driveway, the coolant/water mixture made that boiling sound...

Yes forgot to mention the fan - it's always on (100% of the time) and is working fine too.

The previous owner only used water and told me water is fine for it. But one I had acquired it, I put coolant into it and always topped it up with coolant.

How would I be able to blow a VN head gasket? One of my VNs still overheats, although revving the engine cools it down, and so does drifting through the wind. It runs true straight-gas and so the oil is still in pristine condition after months of being driven - no coolant in it at all...

I mentioned earlier that is was at about the time when the VTs had just come out. So it's possible that the orange VTs I was looking for were all Series 2 VTs; from what I've seen the first Series 2 VTs came out some time in 1999. It seems apparant so far that there was only one really...

The thing is, I'm remembering what I was thinking back then when the VTs had just come out. Back then, I was thinking, of noticing the two colours (the gold tinged Tiger Mica, and a smokey looking metallic orange). The big photo of the Cinnibar VT confirms to me that I don't think...

Well all I remember 100% is that at about the time the Tiger Mica came out in the VTs as a gold-tinged orange on S/SS models, there were also VT Execs driving around with the black under-door and under-bumper areas (sort of like on the the VN Berlinas), and the colour of these VT Execs was dark...

I checked the SV99 colour and it appears like Tiger Mica, except more Gold. I have one more comparison - a better set of photos than the previous. This spoiler shop web-site has a picture of a "smoked orange" sedan in the middle, and a tiger-mica ute at the bottom. The...

If that is Cinnibar, then what is the reddish-orange metallic colour, when you CLICK on the "SERIES 2" ACCLAIM link? From pics I've seen of Cinnibar in car-dealer ads stating the paint code, the "SERIES 2" ACCLAIM link seems to be Cinnibar to me. Meaning I still wouldn't know what the...

Found example pics No (that one looks reddish to me), however, I've found side-by-side pics of a Tiger Mica S/SS, and a "Smokey Orange" Acclaim on the Unofficial Holden Commodore Archive page for the VX: Holden VX Commodore / Calais So what colour is the Acclaim?

Smokey orange Well I just found some pictures of a Cinnabar VX Exec in different lights - it looks red with an orange tinge - the orange was visible in sun light. So it's not the colour I had in mind. I guess maybe the colour I had in mind was in fact Tiger Mica. Although I do...

Well I'm satisfied that the Gold-Yellow is Hyper-Mica. However I'm not sure about the Burnt-Orange colour I had in mind, being Cinnabar-Mica. I found some pictures of a Cinnabar-Mica coloured VT or VX on Carsguide, and it looked metallic REDdish-orange. Does anyone have pictures on...

I remember, about when the VT just came out, there were three new colours I liked. - Metallic Dark-Orange/Burnt-Orange (NO redness) - Metallic Gold-Orange (found to be Tiger Mica) - Metallic Gold-Yellow (NO paleness) Can anyone (e.g. someone with a VT or VX with one of these...

Just an update. With that car I discovered that I actually didn't really bleed the cooling system after I had the right hand head block off the motor one Sunday. When I thought back, I remembered that I didn't have time to bleed it properly, and thought "I'll bleed it properly later" and...

Personally I don't think it's worth the money installing an off-the-shelf cold air intake. You can get the same sort of performance increase by just doubling the size of the hole in the bottom of the VN air-box, and not re-fitting the snorkel. I've tested this so many times on different...

Converting to gas doesn't equal less performance. Although it often does for example because gas shops often like to tune systems on the lean side, to give an impression that you have better economy than you really do. It also depends on the design of the gas converter installed (often...

I thought it was simply that if the car never came from the factory with the proposed engine, you need an engineering certification for it. Easiest way in my mind is just to get a nice VL for a VL engine...

If the VN engine came with a build date of BEFORE July 1989 then (unless someone's changed it before) it has the original timing chain, which typically became noisy like a rusty bicycle chain. In my experience it's just the noise that is the problem. The chain won't cause any other issues...

Well the VN S-packs had the VN V8 brakes. Consisting of: 1.) Dual/Double Brake Booster rather than Single 2.) 1" Master Cylinder rather than 15/16 3.) Bigger & Finned FRONT brake calipers - rear brake calipers same as on V6 You can just swap the V6 VN front calipers for V8...

Yes the ones with double valve springs are the ones with the original cam, but it's *possible* that in the 20-year lifetime of an engine that's already out of its car, the heads may have been changed. A better way to find out is to check the engine number (VH1-something) located on the slant...

Well if after the engine has overheated, if the radiator is still cold, it's obviously likely that the Thermostat isn't working. It's easy to replace on VP engines. A quick cheap fix, is to just take out the thermostat altogether and replace its housing without putting a new thermostat in...

Well I've had a few of these 88 and earlier 89 engines, plus a couple of series 2 ones, all of which I've let major amounts of air in/out of the coolant system (e.g. changed an engine and/or radiator). I always do the same thing - let it run until the thermo opens with the S1 botle cap off, then...

I used "taking off" as an example; Actually revving the engine (even while stopped) always cools the engine down quite well (according to the temp gauge). I had to do this today while sitting at the last few traffic lights (revving it without moving e.g. with the foot on brake to keep the...

Also, the stock VN/VP/VR V6/V8 cats (yes, wow, they are the same between V6 and V8) are amongst the HIGHEST FLOWING available for these models. Plus using one means you don't need to muck up the factory orientation in conjuction with the engine pipes and the exhaust pipe(s). The big body...

It's funny to me how there are so many people, that buy exhaust systems without even knowing what kind of muffler(s) are present in it. You should research to check what design of muffler(s) you desire, how many mufflers you desire, the piping size and design you desire, the brand(s) you...

I have a straight-gas VN where the MAT sensor is always effectively not there to the computer (with a serial cable connected to ALDL program on laptop etc). What actually are the effects on FUEL and IGNITION, with no sensor plugged in? E.g. is timing higher or lower? Obviously...

Has anyone had this before etc and would know the probable cause. Basically the engine "doesn't stop warming up". Once it has warmed up to roughly the half way mark (maybe after 30 mins from first start), the temp will DROP FAST IF ENGINE IS REVVED. After more time has passed, the...

The autos in the older Commodores weren't nice, but the VN autos were totally different. They are very nice to drive and just sing with the engine, and perform just as great. Really, a VN Auto is probably as nice as a VN Manual for you. The VN V6 engines had more power than the...

Here's some facts (unlike what exists in many of the other posts within this thread): The VN HSV DMG-90 is best described as being basically, a V6 Club Sport (yes, it is two words Club Sport not one word "Clubsport). What's a VN Club Sport? A VN V8 with the performance side of things...

Compared with any other VN mem-cal they are very rare. They only existed for a bit over one month and even then, some of these were swapped for APNX in October. Only about 10-15 thousand of them existed - not taking into account ones swapped out for APNX and ones not making their way into a...

Basically, the rear quarter fixed glass is actually different between the VN and VP. Although the fixed glass in the rear doors is the same, and so are all of the other side glass sections as well as the front and rear screens. So to answer your question, no the rear quarters won't swap...

If it says AFTX, do you want to sell it? If so I'll buy it. They are very hard to find, and I only have one at the moment.

Can you confirm whether this map is the actual BBMM map or is it a similar one?

APNX is a late 1988 VN chip, and is quite common because it was simply the chip of late 1988, and also served as the replacement chip for the original VN chip AFTX. AFTX basically was found in September 1988 complianced VNs however some VNs (e.g. ones not sold already) had APNX installed as...