cruisedeisel
Toyota's for life
gerg might be onto something ^^^
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So hope the mechanic is good to ya. Why wouldn't the Isuzu guys work on the engine? So it runs on 2 cylinders and drives. Impressive. Your in my prayers buddy?
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Hmmm? DOesn't sound like its completely toast. More power than a 3b? WHAT??? Compression test first? Or just take the head off?
As in 3 compression and 1 oil ring? I like the sound of 3 compression rings. Id be very tempted to do that if it was an official Isuzu upgrade. Hmm... any long term reports from them? I don't even know who you would even ask. Maybe that Isuzu dealer could give you some feedback?If the rings are Isuzu and of the same design I cant see how an extra ring would be a drawback. I guess you could open the ring gap on the first to accommodate greater boost and temps and still minimise blowby via the third ring. Might be a win win. I remember Dougal mentioning that some Isuzu engines have a lot of blowby specifically because the ring gap is greater to allow for more ring expansion, end to end that is, in high boost applications. I might have dreamt that. I dream weird stuff sometimes.
Greg, the 4bd1t long blocks are cheaper then the 4BG1t long blocks, the 4BG1t comes in at about 8K usd
Dougal,
Motor itself never even showed signs of overheating, ever. Though it kind of makes sense the middle 2 cylinders would suffer the most in the scenario you proposed, which makes sense...
Will know more tonight when the pictures of the pistons come in...
Highest I ever rang the EGT's was 1,200 for a very short period of time, but I have sustained 1,000 for a good 45 minutes
Once you get the head off it should be obvious. I've run 900C accidentally on my engine and routinely run 750C sustained. But I know my probe is in the hottest spot and my ring-gaps are big. 0.4mm (17 thou). My engine has a lot of blowby due to these big end-gaps.
What were your current piston and liners from?
Current pistons and liners were the OEM ones, they were in good enough shape to re-use, or so it seemed at least. Pistons were the bowl shape with the cone in the center if I recall correct
I used OEM rings which were supplied based on the serial number on the block
750C sustained, holy, how many km do you have on the motor?
My motor has a long and terrible history with air-cleaners that leak dust, valve guides that got loose and fed debris into the oil pump and even using the wrong rings which chewed out a set of liners in 27,000km.
Currently has about 10 years and a bit over 50,000km on a set of cheap ungraded chrome liners on aftermarket pistons with genuine rings. The rings are broken on at least one cylinder from oil ingestion from a terrible oil/air seperator which sucked about 15 litres of oil out of the sump and fed it into my intake. That episode resulted in a head-gasket blown on all cylinders. I put a new headgasket in and will deal with the liners and pistons when I have more time.
Still driving great with good power/torque and excellent fuel economy. But it burns a bit of oil.
Wow that is quite a bit of abuse! After all of our time in the desert, I noticed dust in my intake piping too.... I have been dilligent about replacing air cleaners very very frequently, however I had stopped at a place to get my valves adjusted while my wife and I explored the town, and I did not check the work over after... After we completed our time in Moab, which was about 10 days of driving in dust storms I replaced the air cleaner and noticed that they had put the intake boot back on the turbo but tightened the hose clamp down over nothing, meaning I was likely sucking dust in for the entire time I was in Moab...
SO I asked if they were the "alfin type pistons with the reinforced ring lands" and I was told they are "exactly like OEM" what does that mean to you?
When I inherited my vehicle the air-cleaner had elements in it (two in parallel, bizarre setup) which were an inch short and didn't touch the sealing face. I took a whole shovel full of dust out of the air-cleaner and I'm guessing at least another shovel went straight through. Turbo compressor was toast, engine had a lot of blowby but didn't lose oil. Turns out the only thing holding oil in was a bottle-neck in the intake which meant the engine was strangled. I fixed the bottleneck and suddenly it had soo much blowby that I lose all engine oil in a 4 hour trip.
Ah yes, it's been an interesting and frustrating journey.
Pistons just like OEM, sure. The aftermarket pistons I've got in currently are visibly identical in every way (except for the Isuzu logo) to the original pistons that came out of my engine. So clearly either piston makers are very good at copying or they grey-market the same parts without the branding. It's hard to know.