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Engine Specific Info and Questions => IDI Engine => Topic started by: Laurentian on January 20, 2006, 03:59:49 pm

Title: 1.6TD vs 1.9TD rpm's?
Post by: Laurentian on January 20, 2006, 03:59:49 pm

Finally getting on track with my 1.9TD,
Wingman will be taking care of me.
I have seen numerous comments here about 1.9's not
being rev happy like the 1.6's.
However on my local Quebec site ( VWQebec ) I have not
come across this comment.
What's the situation on this, please set me straight!
Hope I have chosen the right motor, have big plans for it!
Thanks in advance,
Hugh

Title: 1.6TD vs 1.9TD rpm's?
Post by: 935racer on January 20, 2006, 05:28:29 pm

The 1.9's do not like to rev like the 1.6's do. I can verify this as I have modified a bunch of both. There are several reasons the 1.9 doesn not rev:
1: crank is 2lbs heavier than the 1.6 crank, and that 2 lbs is on the very end of the counterweights so the reciprocating mass is signifigantly more.
2: The rod caps weigh double of what the 1.6 ones weigh.
3: The 1.9 crank has a longer stroke than the 1.6 crank.
4: The 1.9 flywheel is heavier.
5: The tiny turbo on the 1.9 runs out of breath really quick.
6: The 1.9 lda boost pin has little taper and thus creates very little additional fuel when compared to a 1.6 version.

There are other things too that I am forgetting.

Title: 1.6TD vs 1.9TD rpm's?
Post by: Cheesetoast on January 20, 2006, 07:30:26 pm

all of those things sound like they can be changed/upgraded on the 1.9, if you were to lighten the 1.9 internals, how much power do you think there is to be gained and what would the costs be?

Title: 1.6TD vs 1.9TD rpm's?
Post by: Laurentian on January 21, 2006, 06:32:55 am

Thanks for the clear reply!
I have a K-24 that I will be rebuilding soon with the intention
of installing on the 1.9TD.
I was also planning on some Smog GTD injectors and pump mods.
935Racer I also see you have a high perforomance cam advertised on your PassengerPerf. website.
Would this be worthwhile combined with a big downpipe plus
the other mods I mentioned?
I will not be playing around with the core other than the TDI
pully mod, heavy duty head studs and a better clutch.
Thanks for the help!
Hugh

Title: 1.6TD vs 1.9TD rpm's?
Post by: 935racer on January 22, 2006, 01:36:34 pm

I don't think there is too much to be gained from lightening the bottom end of the 1.9 until someone can solve the high rpm fueling issue. I can't get a diesel to smoke after I flow a head, which is nice as far as no smoke go's but lame as far as I know if I could get more fuel there would be soo much more power.

Title: 1.6TD vs 1.9TD rpm's?
Post by: Laurentian on January 29, 2006, 07:01:27 am

What could I expect performance wise with the following mods I intend to do before the swap?

Gilles performance pump rebuild
Smog's injectors
Large downpipe / exhaust with K24 turbo
Passenger perormance ported head
Intercooler
( and of course better clutch, head studs, TDI crank pully mod )

Thanks!

Title: 1.6TD vs 1.9TD rpm's?
Post by: 935racer on January 29, 2006, 02:41:59 pm

Around 150WHP :twisted:

Title: 1.6TD vs 1.9TD rpm's?
Post by: Laurentian on January 30, 2006, 07:11:52 am

Thanks Dave, who needs a GTI with those numbers 8)
Would the cam be money well spent?

Title: 1.6TD vs 1.9TD rpm's?
Post by: HP on January 30, 2006, 08:28:46 am

Quote from: "935racer"

Around 150WHP :twisted:

And what about reliabiliy/duration??
What reinforcement mods to be done in order to sustain all that power?