115 replies to this topic

[luke.]

jsut seen another come on ebay overnight , its in Luton if anyone has a van?

http://www.ebay.co.u...=item1c22eea36d

I have a combo van if that helps. Am based in midlands. Don't mind driving if you cover diesel
Drop me a text on 07983364489 if you are interested

Edited by luke., 17 January 2012 - 11:04 AM.

[siztenboots]

yes i'd cover expenses of course . just need to do some background checks on the seller.

[Dave E]

I was under the impression that the LEH block wasn't as strong as a LET with the cylinder walls being thinner, am I mistaken? I know this was the diagnosed problem that caused danger7's engine failure

[siztenboots]

well, they look a legit business , I would hate to send in some poor bugger to collect from a pikey site lol

facebook: http://www.facebook....100002468770635
http://www.quattroco.../main/index.php
Quattro Coachworks,
H14 ,Park Avenue Estate,
Sundon Park Road,
Luton
Bedfordshire LU3 3BP

[siztenboots]

I was under the impression that the LEH block wasn't as strong as a LET with the cylinder walls being thinner, am I mistaken? I know this was the diagnosed problem that caused danger7's engine failure

randy's engine seems okay sofar . tbh until we stage 5 it, it should not be a problem.

[steveboyslim]

Hmmm, it's hard to know if that is justified. Maybe.

The main reason the Z20LEH had piston jets installed was for emissions reasons (particularily at idle) apparently, not specifically for cooling at high revs.

That is not correct, they were/are installed for under piston cooling.
I would also wedge the waterway.

Steve

As I understand it the stock VXR had to run very lean (and hot) to hit emissions targets, so the under piston squirters were used to keep temps in check. I ran my car for 3 years without them with no detrimental effects although I am now using them. We have found these engines are quite knock limited so anything you can do to keep the combustions temps down is a good thing. Its one thing making the numbers on the dyno, quite another to keep hold of them when the car is heat soaked on the race track. Remember though, if you do use the oil squirters the cool the pistons you then need enough oil cooling capacity to shed that heat into the atmosphere...

Just about all engine manufactures use oil jet cooling for reliability on turbo engines, diesel or petrol.
Oil cooling does not apear to be a problem using the watercooled set up although with a thicker core water radiator with road use.
I have seen the water cooling replace with an air cooled cooler.
I have used a supplementary air cooled cooler, fitted in the supply feed to a lamova type water cooled cooler, replacing the standard water to oil cooler.

Steve

For the road the little laminova is fine... For track worth it can't even start to keep things in check on high powered cars. I tend to use the oil laminova for the gearbox and a big air/oil cooler up front although on my car there isn't the room up front so I have twin massive Setrabs at the back with a 13" high capacity puller fan which just about gets the coolers into a sensible efficiency range. Keeping things cool in high powered little plastic mid engined cars ain't easy...

laminova was used in series with air cooled rads.

steve

[steveboyslim]

jsut seen another come on ebay overnight , its in Luton if anyone has a van?

he's being a bit keen on price , I wonder if he would take £1500 cash in person, rather than auction.

http://www.ebay.co.u...=item1c22eea36d

I think I can sort you one out for that money.
I will confirm wednesday.

Steve

[siztenboots]

jsut seen another come on ebay overnight , its in Luton if anyone has a van?

he's being a bit keen on price , I wonder if he would take £1500 cash in person, rather than auction.

http://www.ebay.co.u...=item1c22eea36d

I think I can sort you one out for that money.
I will confirm wednesday.

Steve

Okay, bear in mind that a lot of the parts , turbo, clutch, flywheel, alternator, starter, aircon pump, intake manifold, throttle body won't be required. what is of value is the provenance of the engine.

It would be useful to swap contact information as I am sure we'll need a whole load of bits, and I understand you keep a lot of this on the shelf.

mob: 07564 124266

Steve

[steveboyslim]

jsut seen another come on ebay overnight , its in Luton if anyone has a van?

he's being a bit keen on price , I wonder if he would take £1500 cash in person, rather than auction.

http://www.ebay.co.u...=item1c22eea36d

I think I can sort you one out for that money.
I will confirm wednesday.

Steve

Okay, bear in mind that a lot of the parts , turbo, clutch, flywheel, alternator, starter, aircon pump, intake manifold, throttle body won't be required. what is of value is the provenance of the engine.

It would be useful to swap contact information as I am sure we'll need a whole load of bits, and I understand you keep a lot of this on the shelf.

mob: 07564 124266

Steve

The engine is from a reputable salvage yard I deal with which offer a warranty, apart from that I do not have any other details, it was fully dressed with all the parts you don't want, but is only available compllete.
Too expensive for me to purchase for stock, if it is still available I will find out more details.
Message sent with my phone number.

Steve

[siztenboots]

better to update this project thread

removing some tough exhaust studs


all done, head is ready

[siztenboots]

just a coarse first pass on three so far, getting familiar with the casting high points

[Winstar]

Hmmm, it's hard to know if that is justified. Maybe.

The main reason the Z20LEH had piston jets installed was for emissions reasons (particularily at idle) apparently, not specifically for cooling at high revs.

That is not correct, they were/are installed for under piston cooling.
I would also wedge the waterway.

Steve

As I understand it the stock VXR had to run very lean (and hot) to hit emissions targets, so the under piston squirters were used to keep temps in check. I ran my car for 3 years without them with no detrimental effects although I am now using them. We have found these engines are quite knock limited so anything you can do to keep the combustions temps down is a good thing. Its one thing making the numbers on the dyno, quite another to keep hold of them when the car is heat soaked on the race track. Remember though, if you do use the oil squirters the cool the pistons you then need enough oil cooling capacity to shed that heat into the atmosphere...

Just about all engine manufactures use oil jet cooling for reliability on turbo engines, diesel or petrol.
Oil cooling does not apear to be a problem using the watercooled set up although with a thicker core water radiator with road use.
I have seen the water cooling replace with an air cooled cooler.
I have used a supplementary air cooled cooler, fitted in the supply feed to a lamova type water cooled cooler, replacing the standard water to oil cooler.

Steve

Yes and the reason they need to fit them is because of the Emissions and CO2 targets increasing combustion temperatures

I worked on the LET to LEH upgrade, and as Chris said, they where only fitted as the engine wouldn't meet the durability targets with the std LET bottom end

Edited by Winstar, 23 June 2012 - 10:51 AM.

[siztenboots]

so I don't need to bother and can keep the LET block as std, but still run the VXR pistons and some steel rods. is there any optimum temperature for the cylinder head?

[Nev]

is there any optimum temperature for the cylinder head?

As low as sensibly possible I would imagine.

[steveboyslim]

Hmmm, it's hard to know if that is justified. Maybe.

The main reason the Z20LEH had piston jets installed was for emissions reasons (particularily at idle) apparently, not specifically for cooling at high revs.

That is not correct, they were/are installed for under piston cooling.
I would also wedge the waterway.

Steve

As I understand it the stock VXR had to run very lean (and hot) to hit emissions targets, so the under piston squirters were used to keep temps in check. I ran my car for 3 years without them with no detrimental effects although I am now using them. We have found these engines are quite knock limited so anything you can do to keep the combustions temps down is a good thing. Its one thing making the numbers on the dyno, quite another to keep hold of them when the car is heat soaked on the race track. Remember though, if you do use the oil squirters the cool the pistons you then need enough oil cooling capacity to shed that heat into the atmosphere...

Just about all engine manufactures use oil jet cooling for reliability on turbo engines, diesel or petrol.
Oil cooling does not apear to be a problem using the watercooled set up although with a thicker core water radiator with road use.
I have seen the water cooling replace with an air cooled cooler.
I have used a supplementary air cooled cooler, fitted in the supply feed to a lamova type water cooled cooler, replacing the standard water to oil cooler.

Steve

Yes and the reason they need to fit them is because of the Emissions and CO2 targets increasing combustion temperatures

I worked on the LET to LEH upgrade, and as Chris said, they where only fitted as the engine wouldn't meet the durability targets with the std LET bottom end

Is durability not similar to reliability ?
Oil jetting have several benifits and for the £250 is cost to supply and fit the BMW jets I use, in my opinion a very worth while modification.
With the standard head suffering badly even in standard form with cracks between the exhaust valve seats and the spark plug hole, any additional method of cooling the combustion chamber is worth doing, even more so with 'go faster' chip conversions where the fuelling is often not correct, even when the standard ecu is re- mapped.

Steve

Edited by steveboyslim, 24 June 2012 - 07:29 AM.

[siztenboots]

next thing on list , new piston rings for the vxr pistons.

[siztenboots]

rods ordered this week , still plenty on the list to sort out having trouble find a gasket, its between the cylinder head and the alloy block that houses the water temp sensor and the water pipe connector, for a non EGR block looking unlikely to make it now for Le Mans

[Nev]

What gasket are you missing exactly steve? I have a pack of gaskets in my garage, I can look if you tell me.

[siztenboots]

this one, don't see it mentioned on the usual gasket kit

[siztenboots]

cleaning up the forged pistons , just a few minutes in the parts washer , all done by hand this morning , three more to go