VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: RabbitJockey on June 03, 2010, 06:21:52 pm
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http://forums.tdiclub.com/showthread.php?t=281940 (http://forums.tdiclub.com/showthread.php?t=281940)
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Sure you can. That figure above shows only that 2,5 cam has a little more duration than 2,4 cam. Might want to check piston-valve clearance too.
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the cam says it lowers the compression? how is this achieved? holding the valves open too long and letting some air get out?
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A slight valve overlap would be my guess.
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that would be no good for boost..
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Why would that be an issue for boost?? It can only be a small amount of overlap anyway since the overlap happens when the piston is at tdc so very little room is available. Do you think that you would actually lose enough boost out the exhaust to notice it?
I do think that this would be a good cam for the idi's imo. The aaz cam I believe has a little more lift than the 1.6 cam which would be a cheaper upgrade. I don't know if there would be a noticeable difference.
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i thought 1.6 cams were better for some reason having to do with emissions
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(http://img.photobucket.com/albums/v603/burnyourmoney/Camshafts2.jpg)
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that would be no good for boost..
TDI's have turbos and people running this cam most likely run higher than stock boost.
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I can't see the whole sheet. What cam is the yellow line?
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The yellow is the g60 cam.
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At the bottom of the picture there is a scroll bar. It kind of blends in with the taskbar in the picture though.
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so aaz is the better cam...
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so what cam is better, this one or dr. diesels
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so what cam is better, this one or dr. diesels
I'd personally go with Docs cam, as it is purpose designed, but whichever you want to go with is ultimately your decision.
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perhaps he would even chime in on this
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Hey, I had a look at that link to the TDI cams you sent. YAWN!! I couldn't care less about TDIs. In the few moments I was actually able to force myself to read that post (I really, REALLY don't care about TDI stuff) it sounds like they need some lifter bore clearancing work done to the engine. Those cams, with the required clearancing would probably work in a HIGHLY MODIFIED and GILES PUMP'ED IDI engine. Note that the cam locking tool for a TDI engine is different than IDI.
In an IDI engine with a stock pump and few or no mods to promote high rpm breathing, a really big cam would likely degrade overall performance. The drop in dynamic compression (that's a BIG drop on his cam) comes from overlap. That drop in compression will negatively affect cold starting ability.
The wording in his ad is tricky. "...up to 5whp more than blah blah blah other cams blah blah. So he is saying his cam offers a 0-5hp gain over other choices. Meaning, of course, he's comparison tested them all and knows this, right? But then why is he offering someone $140 for their dyno sheets? That makes me wonder just how much testing he's done himself.
"Up to 5whp'. Could be 5, could be 0, could even be a loss of power compared to others. There are way too many variables involved to accurately claim that.
In any case, for some reason, he decided to go the very expensive route of casting new cams. The "OEM casting facility" he mentions has a good ring to it. OEM to OE VW engines? Doubt it. Looked into that myself, and they don't like playing with the public.
There are many places in China that are "OEM" suppliers.
The cams in new vw diesel heads from Topline come from China, which likely explains why they wear out so fast.
I've have witnessed, in person, what manufacturing (generally speaking) is like in China. Not pretty. (That's why I'm heading there for 5-6 years to take over a factory and eliminate the loooong list of quality issues)
Anyway, most of this is speculation.
He says his cams work (in TDI's), I say my cams work in IDI's. Maybe his would perform better than mine when properly fitted to a properly modified IDI.
Perhaps someone should buy one and try!
For Canadian buyers, it'll be just shy of $500 by the time one of those cams is in your hands, after shipping, tax and duty fees. $400ish for US buyers. That's enough dough to buy my cam, a complete head gasket set, AND have your head ported and polished (through my guy anyway). As a comparison, the most expensive 8v camshaft from Techtonics Tuning is $250 US, using an OEM chill-hardened billet. Curious.
Regardless, if you have $500 to spend on your IDI, you're WAY better off saving a bit more and getting a Giles pump than ANY camshaft, his or mine.
You can quote me on that, if you wish.
My two cents.
and this is what he said. hes also checking out the solid lifter compatibility.
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I have now 260 (228@1mm) 10,7mm lift cam in my 1,9 idi. It idles a little rough and smokes at cold, but when warmed, itīs ok.