91 VH45DE Head Gasket Thickness

[Ezekial]

Anyone know this?

Need to know this so i can make sure the ones on mine are standard thickness and will help to calculate thickness of new gaskets to lower compression

THANKS

[BlackBirdVQ]

I will let you know this coming week, I am off all week from work and my Q is parked at work with the heads off- getting new headgaskets.

[maxnix]

Anyone know this?

Need to know this so i can make sure the ones on mine are standard thickness and will help to calculate thickness of new gaskets to lower compression

THANKS

And change the timing also?

[elwesso]

there wasa thread on this, ill see if i can find it... I remember i think that with it under the head it was less than 1mm thick...

[Ezekial]

And change the timing also?

negligable

worse case i'll get adjustable cam gears to match the new cams

anyone had any luck finding the figure?

[John Dixon]

Reply to my post on this by Deadalus:

"Just pulled a HG and took about a dozen measurements from different places. Pretty even distribution between 1.42mm and 1.58mm. It's starting to look like the designed nominal compressed thickness is 1.5mm, but I really thought the HG would compress more than that.If I remember to I'll put some feeler gauges on the other head and see what it yields."

If you need some made in copper, let me know, just had mine back and they look great. Went for 0.9mm on my build, and 98mm bore.

If you do get adjustable pulleys made up, please let me know, I'm after some too.

Modified by John Dixon at 7:12 PM 10/21/2005
Modified by John Dixon at 5:45 PM 10/23/2005

[Ezekial]

so the combustion chamber volume is around 50.87 cc ??

deck height 0 ??

[John Dixon]

Oops, previous should have been 98mm bore, not 99. As for cc and deck height, left it to the engine builder to do. I believe the pistons have a slight bar on top to raise the CR.

[Ezekial]

Oops, previous should have been 98mm bore, not 99. As for cc and deck height, left it to the engine builder to do. I believe the pistons have a slight bar on top to raise the CR.

Have you had it running yet with the 5 mm overbore?

I am very VERY interested to see how it goes ...

Are you confident it will be reliable?

I will get my pistons to suit the same setup but only if i can be reassured that the cylinder walls are thick enough to bore 5 mm safely ... especially when 20+psi is pushed in there from a big turbo

[Ezekial]

John??

[elwesso]

If I recall correctly John has been working on this car for a while and he still hasnt gotten it running yet.. Cant wait until he does, though!

[John Dixon]

Yes, Wes is right, still working on it at the minute. The engine builder that's doing it is confident it'll be OK, but I'm sticking with an NA configuration because I hate turbo engines, so once you're boosting it's hard to say, guess it all depends on the cylinder pressures and temps. Think the liner material will be important too.

I'd expect to have the engine built in the next 2-3 weeks, but it will be some time before it runs. I've currently got the internal parts and dry sump pump etc, just waiting on the block being machined and the new liners fitted. Will keep you updated.

Did you have any luck with the adjustable cam gears yet?

[Ezekial]

I havent had them made but its simple.

Costs around $110 AUD / gear ... i've had a few sets made before for different motor's

[John Dixon]

Cool, could you confirm with whoever did them that a) the VH45 design ones can be done and b) a firm price.Definately have some if they can be

[Ezekial]

oh alright i'll take them to dave next week ... i have to take 5 sets of CB70 gears for some guys in the UK / austria next week so i'll take the VH45 ones as well

[John Dixon]

Cheers, appreciate it.

[maxnix]

I've currently got the internal parts and dry sump pump etc, just waiting on the block being machined and the new liners fitted.

Specifications and pictures of the dry sump would be most interesting!

[John Dixon]

OK, will get some in the next week or so when I'm back over there.The pump is a pace gear 3 stage (2 scav, 1 press): http://www.paceproducts.co.uk tank is also pace 9.5" dia * 16" high, Will get some pics of the inlet (replaces nissan filter housing assembly) etc too.

[maxnix]

Thank you, John.

Is it listed under the Dry Sump System page, or is it totally custom?

[John Dixon]

The pump is this one: http://paceproducts.co.uk/php/...ent=1But the sump pan etc is all custom. Leigh's engine is going to use a BG pump which is a little less efficient on the scavange side.

[maxnix]

So it is crank driven by a toothed cog belt?

[John Dixon]

Yes, I have 2 options:1) attach a small diameter pulley to the end of the main crank pulley2) Have a new pulley made in ali, replacing the rear belt run (A\C) with a toothed drive).

Probably going for 2 as for one it will be much lighter and the engine will spin up quicker. Also, as the only belt driven ancillaries that will be there are the alternator and PAS pump I will probably drive them off a single belt for simplicity.

The water pump is going to be electric most likely as that huge thermostat housing is going to get in the way of the runners, so will use that hole just as a feed to the heater matrix and replace the water pump with a plate with a pipe on it.