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Cam shaft info - gasser cams for upgrade on TDI's.
by
lbreton
on 25 May, 2008 18:07
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#1
by
RabbitGTDguy
on 25 May, 2008 20:38
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Digging into TDIClub even further...you'll find the original cam research as referenced in the thread regarding an 8v gasser "G" grind cam that was used in tdi rs's car....and worked quite well. It did require shaving/machining in the head to allow the lobes to clear as well as some machining to the valve pockets if I remember correctly.
He mentioned is gains as "good" without the sacrifice of a lot of low end...did extend the motor to be able to breath better up high....
had a rough/odd/high idle if I remember correct.
So...what I am saying (other than that database of cams)...there is an even better thread on this very discussion there! It'll be interesting to see how that discussion continues...as it was quite interesting the last time it came around.
Joe
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#2
by
gigaz2
on 26 May, 2008 01:06
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just a note as this is more than discussed already:
Wouldn't a cam upgrade make more sense on a IDI? I mean, a cam usually makes the torque go up in the rev range, and TDI's have a much lower limit.
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#3
by
RabbitGTDguy
on 26 May, 2008 07:14
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The upgrading of a cam on the TDI is possible. Most notably...the cam from a AAZ (still looking for one) will work well and then you have the cams that Dave has through PP. The look of the curve has shown that usually you usually push the meat of the power band up higher in the RPM range at the sacrifice of some low end torque...
Yes, it has been brought up and discussed here pretty well too. I think on either engine...IDI or TDI (IDI could use it more) you just have to be comfortable with the sacrifice in the process (low end torque) for the gains later on. Now, I'd question the cost of performance cam vs. pure performance of....def.
However, if an OEM cam could work in place...that'd be great.
Additionally, I thought more about TDI RS's original posts and my discussions with him a few years back on TDIClub. The G grind cam was just simply able to be used on its own too. I believe he had to have it modified as well. I need to go back and look. I think I archived our PM's to each other.
Joe
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#4
by
jimfoo
on 26 May, 2008 07:23
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What is the difference between a TDI and AAZ cam? I had been looking for that info but couldn't find anything. I guess luckily my TDI was an AAZ, so that's what cam it got. I have a spare cam, but it got some lobe damage to 1 lobe when my lifter broke.
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#5
by
RabbitGTDguy
on 26 May, 2008 08:45
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#6
by
shortysclimbin
on 22 Jun, 2008 16:11
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I have a few more pics to post but have them up on my tdi engine build. So far from what I have found the oem mk3 2.0l cam may not be that bad of a cam for the tdi engine. I will say that the 260/260 tt cam might be a little better but really requires some piston clearance and regrinding to get it to a more neutral (no overlap) camshaft. As far as the paper details I think the technical info that tdi rs has left out is on the issues with mounting a gas cam in a tdi engine. A custom adapter will need to be made and a new timing lock will need to be grooved into the cam. I am working right now on coming up with an adapter and might have it for sale after all things are tested and worked through for the mk3 camshaft.
As far as overlap and issues with it. Does anyone know what the "limit" is with diesel engines and at what point do you drastically loose lower end power?
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#7
by
bluemotion
on 01 Jul, 2008 20:29
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Why not go the other way with the camshaft and tune the TDI for more performance at lower RPM's in an effort to increase mpg's? How often do you really drive a TDI over 4000RPM with all the way the gearing is set up? TDI's have plenty of power...
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#8
by
hatemi
on 01 Jul, 2008 22:41
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The reason for the search of more usable range up high is the fact that to make the power at a lower RPM mans more torque. And after a point it gets useles since it just spins the wheels no matter what. Trust me on this. I know :twisted: 450nm is about the max under 3.5k. Then after 4k it could have more and still keep the grip.
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#9
by
gigaz2
on 07 Jul, 2008 08:04
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I got hold of a "D" grind gasser cam, it is slightly milder than the "G" cam that everyone talks about.
I can't find any info on how to modify the pulley for it to fit on my 1.6TD project, can someone help?
EDIT:
I don't have a gasser pulley, so I can't compare them directly, and the stock gasser aren't adjustable like the diesel ones
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#10
by
shortysclimbin
on 07 Jul, 2008 20:29
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I should have a few addapters made up soon dont know costs yet if you are interested in one.. you could take the cams specs in an aba head...
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#11
by
gigaz2
on 08 Jul, 2008 05:25
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048 109 101D:
lobe center: 113.5º
lift:0.400"
duration @1mm:I217/E215
I guess I can buy an adjustable vernier pulley for a 8v gasser and it should work, but I think the width of the pulley is bigger on diesel, am I right?
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#12
by
lord_verminaard
on 09 Jul, 2008 11:02
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I guess I can buy an adjustable vernier pulley for a 8v gasser and it should work, but I think the width of the pulley is bigger on diesel, am I right?
You are correct. I'm not sure that would work out too well.
Brendan
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#13
by
gigaz2
on 09 Jul, 2008 11:29
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thanks, so I would have to buy both pulleys and make an adjustable one myself... gasser center section and the outside from a diesel one.
guess I'll wait for those adapters, cam goes into the "interesting but currently worthless parts" shelve
