bettsy64
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Anyone know what a dangerous temp for theses engines is? Need to know what egt gauge to get
19j exhaust gas temps
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tottot
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Read somewhere that intake air temp can be up to 190 degrees. Having an egt gauge wont help but fitting an intercooler and making sure rad and thermostat are in good order will.
bettsy64
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I've got an intercooler and Rad temps are good. I'm gonna make a straight through exhaust and wanted to see if it reduces egt's at all. I think it should. Just want to see if I'm pushing it too hard because the main reason these engines fail is high egts so I've heard.
tottot
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I think they fail because of the high temp of the intake air which leads to high combustion chamber temps,but it will be interesting to see if a straight through pipe helps reduce them. Perhaps a cylinder head temp gauge would give a clearer result. cheers.
bettsy64
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I dont think the air intake temps causes it, it's just that an intercooler lowers the combustion chamber temp slightly. And hopefully a straight through exhaust will discard of the heat quicker. I turboed a 4.0 landcruiser and fitted a egt gauge because I was worried about the same thing and a straight through exhaust reduced the egt quite a bit so with a bit of luck it'll be the same
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High temperature air is less dense than cold air and contains less oxygen, how can hot air increase combustion temps?
tottot
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Yes wammers you are likely right about the combustion temps themselves but having very hot intake air entering the inlet chambers is not a good thing.
My old 19j ended its days running rather rough and when I removed the Head there were several cracks to be seen and all 4 pistons were cracked 2 all the way across but it was still running like that!!! Motor had never been cooked but it had worked hard all its life.
My old 19j ended its days running rather rough and when I removed the Head there were several cracks to be seen and all 4 pistons were cracked 2 all the way across but it was still running like that!!! Motor had never been cooked but it had worked hard all its life.
mistericeman
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They "Usually" fail due to folks treating them like a 2 1/4 that will take all manners of abuse in their stride .....Ticking time bomb springs to mind, before you spend a heap of money on one .
By all means try to keep ALL the temperatures down AND change the oil at least once a week ;-)
By all means try to keep ALL the temperatures down AND change the oil at least once a week ;-)
bettsy64
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Yeah there's no way I'm spending money on it, just messing about with it until I rebuild the tdi lump in my garage. Figured I could use a egt gauge on that as well. I quite like the engine actually, just need to stop pushing it
FlyingPete
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If it's in good condition and you treat it properly, a 19J is a perfectly good engine that should carry on going. Neglect maintenance (waiting for it to fail so you can fit a tdi?) and it will (unsurprisingly) most likely break down. If you quite like the engine, why swap it out for something else?
Turboman
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The hot intake air puts extra heat into the engine, in addition to the combustion heat, and this can lead to localised heating within the engine, especially round the cylinders and combustion chambers. Which is what contributes to the well reported problems with cracked heads and blocks. Very hot piston crowns crack easily, or are vaporised by faulty injectors. Careful attention condition to condition of cooling and lubrication system helps, as the water and oil are the only routes for excess heat to leave the engine.
OP, have to say, I think you are wasting your money. If you want to keep it running reliably, injector service, change oil cooler stat, check rad for flow, regular oil changes using an oil with good heat resistance. More likely to keep it reliable than random mods.
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Hot air is less dense than cold air and contains less oxygen and therefore the combustion is less efficient. Every car with an EGR valve is liable to blow up if what you say is true. The exhaust gas is hardly cool. Must be a lot of blown heads in places like Saudi Arabia if hot induction air causes what you say. Hot air will certainly make the engine run below it's peak efficiency. But it won't cause damage as long as the cooling system is up to scratch..
Turboman
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Agree entirely, intercooling was introduced shortly thereafter to deal with the inefficiency of hot intake air.
Not sure what happens in Saudi, but in the UK, many have 19j have blown up.
And as I have posted many times, cooling system condition is vital on these, oil has quite a role in cooling too.
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Agree entirely, intercooling was introduced shortly thereafter to deal with the inefficiency of hot intake air.
Not sure what happens in Saudi, but in the UK, many have 19j have blown up.
And as I have posted many times, cooling system condition is vital on these, oil has quite a role in cooling too.
Maybe it was an intrinsically badly designed engine. Don't know a lot about the 19J but reading up on it's history would seem to bear that out. BMC produced a lot of shit in it's time the Maxi engine was a prime example. With a production run of three years from 86 to 89 that would tell me the engine was doomed from concept and recognised as a failure very early on. Lack of proper maintenance would make it even more prone to failure.
Turboman
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2.5 na was a very well designed engine!
It just wasn't expecting to have a turbocharger bolted on it!
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2.5 na was a very well designed engine!
If it wasn't designed for a turbo charger then fitting one brought out it's intrinsic problems. You can't lift a five ton load with a two ton crane and not expect the jib to bend a bit.
bettsy64
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Because a tdi came with the car, and they're slightly better, and why not, and who said I'm neglecting it and waiting for it to blow up?! And who said im not checking heat and changing oils. my question was what's a dangerous egt so I can get a gauge?
FlyingPete
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Not suggesting you are mate, just pointing out that the 19J gets a bit of a bad reputation (some seem to have the opinion that they're always on the brink of failure) that isn't entirely deserved. Once upon a time it was fairly common to basically abandon a perfectly serviceable engine in favour of one pulled out of a rotten discovery. As tdis are themselves getting on a bit, nowadays I think it's probably best to keep the 19J running while you rebuild a tdi on the bench if that's the route you want to go down
Turboman
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By and large I agree, and the continual shouts of 19j are sh!t are unlikely to lighten the mood of someone who is actually having a problem.Not suggesting you are mate, just pointing out that the 19J gets a bit of a bad reputation (some seem to have the opinion that they're always on the brink of failure) that isn't entirely deserved. Once upon a time it was fairly common to basically abandon a perfectly serviceable engine in favour of one pulled out of a rotten discovery. As tdis are themselves getting on a bit, nowadays I think it's probably best to keep the 19J running while you rebuild a tdi on the bench if that's the route you want to go down
Personally, I paid not much for a 90 that had a brand new Turner recon engine, just a few k on it. So I wasn't particularly tempted to remove in favour of a Tdi with 200k on the clock.
