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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old June 10th, 2019, 06:27   #241
[486]
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Originally Posted by PickleRick View Post
Any valve train mods needed to run at 4800 rpms for hours on end?
stock valve springs do pretty good with bigger turbos, as you don't have as much exhaust pressure trying to blow them back open
stock oil pump/drive gear is better than the faster brm one which some people have had cavitate at higher RPM

on the lag, a couple seconds' lag ain't bad on a marine engine because you've only got the one gear. With decently done up maps it'll come on (and not wreck anything) lugging it at 2k RPM. One of the magical things of turbochargers is that attribute, they aren't connected to the crank so they'll come up to speed at basically any engine RPM.
People here are overly sensitive to it because pretty much everyone runs a manual trans in a lightweight car.

ETA: my comment of the turbo waking up eventually at 2k is not to mean you should be setting up your prop to live down there. unless you're happy with limiting it to less than stock hp output. Motor would not be happy with that kind of torque load at 100 percent duty cycle.

Last edited by [486]; June 10th, 2019 at 06:31.
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Old June 10th, 2019, 07:21   #242
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With my boat hull. 4800 to 5000 rpms is currently max speed. Unless running from a storm im usually cruising at @ 4000 to 4200 rpms. The cruising speeds will be maintained for hours at a time. The goal is a Charleston sc to dry tortugas round trip but also many lake trips in between.

There is also a lot of hull speed cruising. This is 6 to 7 knots, 1500 to 2000 rpm no wake cruising. Sometimes down to 4 or 5 knots for trolling. Pretty much an extended cocktail hour no where to go in a hurry enjoying the ride boating .
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Old June 10th, 2019, 07:21   #243
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Sub 3000 rpm seems too slow for continuous cruising, and 4800 rpm too fast. I'd think ~3300-3500 would be the sweet spot.
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Old June 10th, 2019, 12:13   #244
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Slow no wake cruising speeds like you'd do around marinas, bridges or trolling for fish would be 2000 and less.

Cruising on plane would be over 3500 for a 23/24 ft modified V flat bottom planing hull. My boat isnt super happy on plane until around 4200 rpms. There are other hulls out there that may get on plane easier/less rpms but this is going to be a good "norm" for most 90s eras cabin cruisers in this size range.

I agree that top cruising speeds on plane. 3500 would be better than 4200 or 4800. 2800 would be amazing. As of this point it seem unachievable.

There is the possibility of a 3 speed transmission, inboard velvet drive and a huge propeller but it wont work on this boat. Maybe an old tunnel drive pen yan.
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Old June 15th, 2019, 12:30   #245
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Quote:
Originally Posted by PickleRick View Post
Any valve train mods needed to run at 4800 rpms for hours on end?
I think runing a tdi on water AT more than 3500rpm will grind The engine n a few days of use. I run a 2.0tdi BMM on my Searay 185sport. Had a 4.3tks/alpha one gen2 1.8r and switched IT to tdi.
The mods were:
-1.65r upper gears (24 drive 24driven)
- cut a 5 inch slice out of a manual gearbox . Used this to mount The starter and also welded 2 arms that fit on The transom mount.
-1 inch thick Steel front engine arms to fit on 4.3 engine mounts.
- watercooled exhaust pipe after The turbocharger
- mercedes GLC 2.2cdi watercooled intercooler (A friend of mine, on his Bayliner Cuddy, s using a universal watercooled intercooler bought on ebay and works also great)
-water-coolant heat exchanger stainless Steel made (my pal, on his bayliner/1.9tdi runs sea water n The engine and changes The engine every 4 seasons.. About 500usd for a 1.9tdi pd)
- ecu job on EDC16U34 (egr off, dpf off, remap AT about 160 shaft horsepower) - again, my friend uses a EDC15, much easier to tune and a AVF/AWX engine .
- 1200 celsius heat resistant heat wrap on The exhaust manifold.

If you want me to upload some clips please tell me how.

Tried to fit a core- watercooled hibryd turbo but IT didnt made The bosst. Guess jap cartridge didnt liked The garrett housing so I swaped to a GT1749VK.

Numbers;
n plane n 5-6 secconds
Cruise AT 2500rpm
Max 60km/h AT 3500 rpm
Will install a EGT sensor tomorrow. My tuner told me to check on EGT and send him feedback. Still trying to fine tune The ecu. More than 700 celsius degrees on turbo will kill IT.
Fuel consumption-- about 3.5 galons /hour AT Cruise speed.

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Last edited by dukku; June 15th, 2019 at 12:34.
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Old June 19th, 2019, 02:04   #246
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@Dukku
Thanks this is very informative
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Old June 30th, 2019, 12:05   #247
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Here is a clip with the boat. EGT s about 450 celsius AT WOT.
https://youtu.be/fbAf7N1sHS0

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Old June 30th, 2019, 14:25   #248
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Originally Posted by dukku View Post
I think runing a tdi on water AT more than 3500rpm will grind The engine n a few days of use.
what? it is the same base engineering sheet as the 1.8t and 2.0 gasoline engines, which are cheerful to sing at 5k all day
only reason the 1.9s don't rev is the stock turbos are absolutely tiny and choke the engine out past 3k
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Old July 2nd, 2019, 05:15   #249
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The vw 2.0tdi marine, as I read on a spec sheet, s rated AT 3500-3800 rpm. Its not just The turbo, s The EGT that results, and be sure that The marine version s better than a marinised vw engine as we try to.
Comparing The 1.8T to 1.9/2.0 tdi, I guess The pushrods AT The tdi are longer.
The only Vag tdi engine rated AT 4500 rpm s The 2.7tdi V6 wich s a square engine(much like a gasoline engine) meaning That The bore and stroke are equal.

n Europe we have 1.9sdi and 2.0sdi and, despite The fact they are naturally aspirated engine, The power s rated AT 4000 rpm.

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Old July 2nd, 2019, 06:26   #250
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Quote:
Originally Posted by dukku View Post
The vw 2.0tdi marine, as I read on a spec sheet, s rated AT 3500-3800 rpm. Its not just The turbo, s The EGT that results, and be sure that The marine version s better than a marinised vw engine as we try to.
Comparing The 1.8T to 1.9/2.0 tdi, I guess The pushrods AT The tdi are longer.
The only Vag tdi engine rated AT 4500 rpm s The 2.7tdi V6 wich s a square engine(much like a gasoline engine) meaning That The bore and stroke are equal.

n Europe we have 1.9sdi and 2.0sdi and, despite The fact they are naturally aspirated engine, The power s rated AT 4000 rpm.
fact that they themselves have you spin it that fast to get rated power says something

fun aside, marine and industrial motor ratings are typically 100% duty cycle where automotive ratings are generally lower duty that that, where if you run them at their rating for hours on end things tend to fail quick.
in a gas application they'll slap a tiny carburetor (long ago) or camshaft on it to limit power output, where on a diesel they just pull some fueling to limit output to where it'll hold together

by pushrods, pretty safe to assume you mean connecting rods, which is a common modification to higher revving engines. Move the piston pin up in the piston for a longer rod and a better rod angle. Our motors have a higher deck height, some guys use a deck plate.
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Old July 2nd, 2019, 09:58   #251
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Connecting rods, sorry for The mistake.
The idea s that I run my tdi boat engine not higher than 3500 rpm and The usual cruse speed rpm s about 3000-3300. And EGT lowe than 500 celsius.
If anybody would run their marinised tdis AT higher rpm for more than a few minutes.. IT would be their choice and it's not my business.


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Old July 2nd, 2019, 10:02   #252
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And one more thing, The 1.9 tdi car engine, across Time had been tuned n different power ratings.
What i've notticed s that The heavier The car, the lower was power rating set

For example, on caravelle van, The 1.9 tdi is rated AT no more than 105hp, on Passat The older edc15 was tuned AT 131hp while on golf 4 wich was lighter IT was tunned AT 150hp.
I guess for The engine parts to last longer s better to have that n mind.
By my oppinion a engine feels The boat like a car fully loaded pushing uphill continuously.

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Old July 2nd, 2019, 12:00   #253
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A marine mechanic once told me they assume a marine engine runs at 90% load 90% of the time, as opposed to an automobile 10% load 90% of the time.
I met someone in Houghton Michigan that was traveling the Great Lakes with a 32 foot tug with the 6BT in it. He claimed it felt like the turbo wasn’t coming on the way it should. Considering what exhaust gas temps must climb to while pushing water it makes sense that that is the way it was properly set up to run.
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Old July 2nd, 2019, 17:13   #254
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Lets not forget that that's not always the case. The marine 4bt put out 250hp compared to the 130ish hp found in a delivery truck. Mostly used in trawler type displacement hulls. Think boat from jaws.
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