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General Information => Troubleshooting => Topic started by: jiggs on January 16, 2009, 01:12:55 am

Title: AHU engine crankshaft in 1Z engine?
Post by: jiggs on January 16, 2009, 01:12:55 am: So, the 1Z engine I´ve got broke the crankshaft... i´ve been told that its a common problem in 1Z engines...

is the AHU (tdi 90hp) crankshaft compatible with 1Z engine?

what can be done to make it possible ( if not)..

tanks for the help guys
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on January 16, 2009, 01:53:57 am: I'm not 100% sure but the AHU crank should go to thr 1Z block. But I'd ditch the weaker 1Z block and find AHU or AFN block and use that one.
Title: AHU engine crankshaft in 1Z engine?
Post by: rallydiesel on January 16, 2009, 11:46:43 am: Yeah, I think it is basically identical. Both don't have the chain-driven oil pump. You could even use an AAZ but it won't have the D-shaped crank gear mount.
Title: AHU engine crankshaft in 1Z engine?
Post by: jtanguay on January 16, 2009, 11:53:04 am: why is the 1Z crankshaft 'weak' ??? isn't it the same as the 1.9 crankshaft? people get more than 150hp from that crankshaft without breaking it... how much power were you putting out???
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on January 16, 2009, 02:40:23 pm: I don't know how much weaker the 1Z crankshaft is compeared to AHU crank. But the 1Z cylinderblock is quite weak compeared to AHU or AFN block. If you are planning on pulling some serious power out of the 1Z I'd switch to AHU Cylinderblock.
Title: AHU engine crankshaft in 1Z engine?
Post by: jtanguay on January 16, 2009, 04:46:10 pm: Quote from: "Christian_Finland"
I don't know how much weaker the 1Z crankshaft is compeared to AHU crank. But the 1Z cylinderblock is quite weak compeared to AHU or AFN block. If you are planning on pulling some serious power out of the 1Z I'd switch to AHU Cylinderblock.

but the AAZ/1Z should hold up to 180hp? the 1.6TD block was pushed to nearly 200hp by 935racer and held up. surely the 1.9 block could withstand that amount of power as well... now the rods are a different story... andy2 was able to slightly bend them with high boost.
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on January 17, 2009, 02:13:32 am: AAZ and 1Z bottom ends will hold up just fine to approx. 170-200HP. The low end torque is what kills tose engines. Aki-76 had in his AAZ about 260hp/420Nm/2.6bar and the stock bottom en held up becouse the engine was giving the power in high revs. The redline was at ~6500.

When VW moved from 1Z to AHU bottom end they made some reinforcements to the engine block. AHU engine block is capable of handling power at least up to 300HP.
Title: AHU engine crankshaft in 1Z engine?
Post by: jtanguay on January 17, 2009, 03:06:49 am: Quote from: "Christian_Finland"
AAZ and 1Z bottom ends will hold up just fine to approx. 170-200HP. The low end torque is what kills tose engines. Aki-76 had in his AAZ about 260hp/420Nm/2.6bar and the stock bottom en held up becouse the engine was giving the power in high revs. The redline was at ~6500.

When VW moved from 1Z to AHU bottom end they made some reinforcements to the engine block. AHU engine block is capable of handling power at least up to 300HP.

yea i suppose you're right... the low end torque is definitely a killer
Title: AHU engine crankshaft in 1Z engine?
Post by: jiggs on January 17, 2009, 09:23:06 am: hum... interesting,,, :?

what about a ahu crankshaft in a aaz engine?

I have a newly repaired, stock but the crankshatf is also busted...by the timming sprocket.

what do you think guys? should I go AHU crnkshatf on tthe AAZ?

thanks guys :roll:
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on January 17, 2009, 11:14:24 am: I think the crankshaft is quite strong in all vw diesel engines. Conrods are weaker in AAZ. One thing that breaks those older engines is that under heavy load the engine block gives up and big end bearing move and that causes extra stress, unwanted vibration and disbalance to the bottom end. Then the weakest link cracks. Solution is to use a firm main gridle.
Title: AHU engine crankshaft in 1Z engine?
Post by: jiggs on January 18, 2009, 05:04:05 pm: so... there should be no problem in going AHU crankshafting the AAZ...
getting the AHU timing kit to fit the AAZ ...

yes? :oops:
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on January 18, 2009, 10:00:45 pm: If the AHU crank fits the AAZ block correctly then there isn't a problem. Should be a bit stronger even. Remember to check clearencer with that plastic/wax measurement thing (don't know what it's called in english).
Title: AHU engine crankshaft in 1Z engine?
Post by: jiggs on February 01, 2009, 04:11:37 pm: damw... no can do... it wont work... :evil:

aaz crankshaft only for aaz engine...

thanks for the input guys, i really apreciated it.

greatings from overseas :D
Title: AHU engine crankshaft in 1Z engine?
Post by: Christian_Finland on February 01, 2009, 06:54:05 pm: Could you tell us what's the difference? The pulley of course is different but what else?
Title: AHU engine crankshaft in 1Z engine?
Post by: rallydiesel on February 02, 2009, 11:48:35 am: Are you sure? I was pretty certain an AHU or 1Z crankshaft will fit an AAZ block. Just use the TDI crank pulley, which is much better than the AAZ one anyways.
Title: AHU engine crankshaft in 1Z engine?
Post by: jiggs on February 02, 2009, 02:37:08 pm: the spacings betwen the fixation points, and the clearence to the timming sprocket...

well... thanks for the inputs you guys only by milling you can adapt...

too much expensive, got a good as new, for 200 eur, plug and play

and there ya go, gtd aaz on the road.
Title: AHU engine crankshaft in 1Z engine?
Post by: rallydiesel on February 04, 2009, 01:14:52 pm: This is confusing. So do you have a 1Z, an AAZ, or a GTD? Because a GTD is a 1.6 and the 1Z, AHU, AAZ cranks will definitely not fit.
Title: AHU engine crankshaft in 1Z engine?
Post by: blackdogvan on February 04, 2009, 02:28:06 pm: If it helps I have a AHU/1Z crank in my AAZ. I did this to solve the crank nose issue for good. Finding a crank at a reasonable prie wasn't too hard. I believe they are the same till after 1998 when they changed the block to the ALH. Ask Jimfoo, he'll tell you all about AAZ blocks being identical to 1z AHU blocks.
Title: AHU engine crankshaft in 1Z engine?
Post by: rallydiesel on February 04, 2009, 02:37:02 pm: Exactly, that's why I think the OP got his codes mixed up. I assume he actually has a 1.6 GTD.
Title: Re: AHU engine crankshaft in 1Z engine?
Post by: jiggs on May 28, 2009, 04:14:52 am: bad miss understanding, it was a aaz engine with broken crankshft, not mine.

what the owner told me was that the 1Z didn´t fit. so he got an ahu engine and replaced all the components and added the electronics.

its running fine now...

sorry about the lag...
Title: Re: AHU engine crankshaft in 1Z engine?
Post by: jtanguay on May 28, 2009, 03:49:09 pm: yea... PD100 rods work on the AAZ engine... so i'd imagine that there is a very good chance that the crankshaft would fit also.