A5INKY
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Quick port job. Ha ha, that's funny.Have the guides checked and replace the seals no matter what (7mm). Good time to clean out all the intake port goo and at least do a quick portjob on it .
Quick port job. Ha ha, that's funny.Have the guides checked and replace the seals no matter what (7mm). Good time to clean out all the intake port goo and at least do a quick portjob on it .
Yeah ask Robert - send your head to Bill and you might have it back in about a year, or maybe not. http://forums.tdiclub.com/showthread.php?t=326601Quick port job. Ha ha, that's funny.
To remove the main caps 1 & 5 on an ALH in the car I needed a 17mm socket that had an OD of 0.855" per Whitbread's post. I turned down a cheep china socket like the below and was just able to get to fit.I might be able to get an open end wrench or a crowsfoot on them, but they're tight clearance.
All I can find is socket head capscrews in 12.9 - no hex head like what was in there. This will make installation a snap (and removal if I should ever have to do this again).
I can turn down a socket or use a wrench or whatever to get the existing bolts out - I was more concerned about getting them back in, but the socket head screws elimnate that issue.
Yeah ask Robert - send your head to Bill and you might have it back in about a year, or maybe not. http://forums.tdiclub.com/showthread.php?t=326601
This is consistent with my experience with my truck. The shorter injection event runs cooler & in effect results in a slight timing advance. I'm curios what sort of EGT's you ran during those long heavy tows.larger nozzels spray the same amount of diesel in a shorter time, what results in less smoke, less thermal stress and better mpg.
I think also pcp will be less because of a much shorter injection with bigger nozzels.
Would going to an 11mm pump from a 10mm also shorten the injection time?larger nozzels spray the same amount of diesel in a shorter time, what results in less smoke, less thermal stress and better mpg.
I think also pcp will be less because of a much shorter injection with bigger nozzels.
1. Better control of start and end of injectionSilly as it might sound - maybe putting larger nozzles in and dialing the tune back to the same power level would help make the pistons live longer?
Looking at the pistons, the aluminum looks like it's been almost molten where the injector nozzles spray. There is definately a different texture in that area. #4 was the worst shown below (not sure why all 4 pistons don't show this equally?). A larger nozzle might keep the spray pattern inside the bowl?
On the flip side to that, will injecting the fuel in a shorter duration create higher peak cylinder pressures making the rod bearing wear worse? Potentially retard the injection timing a little?
No changes planned for the immediate future, but just thinking ahead here...
When towing a heavy trailer, use a lower gear and let engine rev. If it takes say 80hp to pull the trailer, you are better off doing it at say 3200rpm than at 2400. Piston temp is lower with the higher revs.
I have yet to see a head with over 100K that didn't need guides. I'd be putting in valves as well.Have the guides checked and replace the seals no matter what (7mm). Good time to clean out all the intake port goo and at least do a quick portjob on it .
Bingo!Yes with a 11mm pumphead you inj the same amount of fuel in shorter time.
My rules are with tdi Tuning use large enough turbo and fuelpump,nozzels. For you HP goals.
Than make the tune smoke free. So you don't go over the mechanical limit of you setup.
Yes driving habits also make a difference.
So the engineers that say it's safe to run a sustained 1650F are all wrong? People forget that the pistons are cooled by oil, and are only subjected to the max combustion temperature for a short time.. This has been discussed in other threads at great length..I say 1650 is too hot. Aluminum melts at 1250 so I wouldn't go much past that for long periods of time.
Just to bust your balls, try waving your hand in front (close range like you say) for more than 5 minutes... bet your hand will still get too hot and you'll pull back or speed up how fast you wave your handSo the engineers that say it's safe to run a sustained 1650F are all wrong? People forget that the pistons are cooled by oil, and are only subjected to the max combustion temperature for a short time.. This has been discussed in other threads at great length..
Example, skin burns at a temperature of around 120F, but you can wave your hand through the flame of a mapp or propane torch without getting burned at all.. It's all about the amount of time exposed to that sort of temperature..
The best thing to do is to monitor EGT and oil temperature.. If you start seeing oil temperature (measured in the pan) rise over about 275F, back off... It takes about 10 minutes of 1600F EGT at 180hp output to get oil temperatures up there though.. That's a LOOOONG hill with a 3500lb trailer in tow at 75mph in 4th (at least with my car)...
Yes, but hand to flames is subjecting the skin to temperatures 10-20X what the limit of the skin is... it would be like subjecting the pistons to 14000 degrees...Just to bust your balls, try waving your hand in front (close range like you say) for more than 5 minutes... bet your hand will still get too hot and you'll pull back or speed up how fast you wave your hand
You can't base limits on egt alone. When changing pumps, nozzles, timing, tunes etc, the delivery of fuel with respect to piston movement changes. If the fuel goes in early, peak cylinder pressures are high, and heat transfer rates to piston and head are also high. Since more heat is transferred to the metal, less heat is in the exhaust so egt actually drops! Yet the engine bits are in more trouble!
If you dyno an engine and record egt peaks, then retard timing, keeping all else equal, the egt goes up and yet fire deck temps drop.
Its a complicated balancing act dialing in a motor, and not all variables are available to view without expensive test gear.
So don't change the engine parameters and then assume that below a certain egt, all is well. More to it.
Yep - That's my car.All loaded up? is that your car?
No oil temp gauge but I have one on order am also installing the PD134 oil coolerFUB - Do you have oil temp gauges? Where was your timing advance set (adaptation)?