VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: oldskool rich on November 10, 2008, 06:10:39 pm
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today i was builing a generator for my garage out of an old 1.6na
it been a while since i played with one, i had sum spares lying around so i thort id see what i cud do.
well the aaz pump bracket fits on with one bolt, and the serpantine axilary belt system fits too, with the exception of one one bolt, but then the peace of cast ally on the front connects to the pump bracket and holds it all together, so surly u folks out there in IDI land cud run aaz pumps on gtds to get a bit more power? and also run a clutched alternator to help the pully from killing the crank.
just a thort
maybe everyone knows this already :roll:
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actually there was a serpentine conversion kit at zsimports.com that i've been eye balling, so i knew about the serp conversion... but not really the aaz pump & serp conversion, although the 1.6 & 1.9 blocks are very similar...
this is good info! thanks
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clutched alternator??? the alt can be disabled by means of a wire, it will only have the rotor inertia then.
later alt pulleys have a one way system, it freewheels when spun backwards avoiding "killing the crank"
but you are using the 1.6... it doesn't have that problem it was the aaz's witch were prone to that
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The 1.9 uses the same crank pulley as the 1.6, the difference is the serpentine belt set up on the 1.9. The serpentine belt is more efficient and better transfers the "spikes" than the V-belts do, which unfortunately results in the crank pulley breaking off unless you take preventative measures.
The clutched alternator pulley isn't like an AC clutch. A piston engine doesn't turn at a "smooth" speed, rather it speeds up on each power stroke and slows down again as the fuel burn slows down. It's not a huge difference but the inertia from the alternator resisting this effect was determined to be part of the problem with the original crank pulley design failing on the 1.9 engines. The clutch allows the inertia of the alternator to over-run the belt just enough to prevent hammering against the crank pulley keyway. Clutched alternator pulley = one way alternator pulley.
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Does anyone have a picture of that pulley?
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if you read his (oldskool rich) post, you would understand that he talked about the clutched pulley on the alternator (one way pulley) IF you wanted to go the 1.9 serpentine setup route...
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I understand what it is and the reason behind it but I want to see a picture of it.
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I don't think he was talking to you, zuk. Here's a pic of the pulley from tdiparts.com:
(http://www.tdiparts.com/catalog/images/gallery/d/2292-2/alternatorpulley.jpg)
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Seems like a great mod to kill your engine to me.
When I fit AAZ's to T3's (Vanagons) I make a point of putting them onto a V belt and getting rid of that serpentine belt to save the crank nose.
Remember also that if you use the alternator that they run at a different speed and your tacho will read on the piss.
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Seems like a great mod to kill your engine to me.
When I fit AAZ's to T3's (Vanagons) I make a point of putting them onto a V belt and getting rid of that serpentine belt to save the crank nose.
Remember also that if you use the alternator that they run at a different speed and your tacho will read on the piss.
That's a good point.
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I don't think he was talking to you, zuk. Here's a pic of the pulley from tdiparts.com:
(http://www.tdiparts.com/catalog/images/gallery/d/2292-2/alternatorpulley.jpg)
Ah I see 8)
Thanks for the pic, that's what I needed.
I don't think I'll be doing the conversion the more I think about it but sure cant hurt to have the knowledge if the time ever comes.
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Seems like a great mod to kill your engine to me.
When I fit AAZ's to T3's (Vanagons) I make a point of putting them onto a V belt and getting rid of that serpentine belt to save the crank nose.
Remember also that if you use the alternator that they run at a different speed and your tacho will read on the piss.
i HATE changing v-belts! my system needs to be re-tightened on a regular basis... sooooo annoying!!! but the bulletproof-ness of the v-belts, and the cheapness of the system make it very appealing...
i just LOVE having to take my main belt off to get at the alternator belt :roll: :lol:
but to each their own!
and zukgod, i was just trying to make it clear that rich was talking about using the clutched alt pulley for the 1.9 serp conversion... not directed at you :wink:
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hi,
i have a 140A alternator with one-way pulley on my audi, works absolutely
great. no noise or re-tighten neccesary :)
the one-way pulley takes a lot of stress from the crank-pulley, because
the alternators rotor can not transfer braking-force on the crank, when
it ist slowed down during a compression-stroke.
greets, michael
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You can retrofit the 1-way pulley to the older AAZ alternator with the solid pulley:
http://www.vwdiesel.net/phpBB/viewtopic.php?t=15010&highlight=aaz+alternator+pulley
If you twist the pulley of the AAZ alternator by hand you'll see it has a lot of momentum... momentum that overdrives the crank sprocket when you take your foot off the gas and puts stress on the already-weak sprocket design.
The AAZ pulley is also smaller than previous editions.. this gives it more of a mechanical advantage when it overdrives the crank.
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so its a semantics issue.. oldskool rich called the one-way pulley a clutched pulley, these are different things.
if going for the serpentine setup then by all means use a one-way
or keep it simple and use a V-belt setup
I've swapped my brothers alt and the new one had a solid pulley, man does it vibrate! I have to get a way to put the old one-way back in before the crank nose goes
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sorry i thort clutched was one way, didnt know there was 2 different ones
i dont get why people are scared of the serpantine system, get a TDI alternator which is more reliabale and usualy more amps, if your worried about the pully then eather do what i did and use a tdi crank, of just drill a hole in the pully through to the crank and put a pin in it
Ive only had bad experiances with V belts, they always come loose sum how :roll:
as for aaz pump, they are superior but duno if its worth the hastle, its the only pump bracket i cud find in my bit box
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as for aaz pump, they are superior but duno if its worth the hastle, its the only pump bracket i cud find in my bit box
How so? This is news to me.
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yup, aaz pumps aren't superior in any way to a TD.
If the goal is to build a generator, one doesn't need to worry about alternators, in fact it doesn't even need one as you will already have a huge one connected to the crank anyway
EDIT: now that I think of it, for a generator you only need a NA pump, as the LDA will never be used, generators work in stationary mode, in a very narrow sustained rpm range.
usually an electronic controller is used to handle the throttle lever