Turbo type4 fastback:)
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- Posts: 20132
- Joined: Fri Jul 07, 2000 12:01 am
One day...
People will listen...... How many failures does it take for people to get the point??
Amazing.......
There is no failure worse than a flat cam, I have my share of those experiences, but those 18 months of development were worth the time and expense.
I feel your pain as well.....
I'd like to know what cam blank Web used to grind this cam, if it was integral the problem has been discovered... EVERY one of those I tested failed in less than 3 hours in the spin device.
Web's QC has slipped a bit in the past year and I have moved the majority of my cam grinding in house, only using Web for the 11 grinds of theirs that are "theirs"....
People will listen...... How many failures does it take for people to get the point??
Amazing.......
There is no failure worse than a flat cam, I have my share of those experiences, but those 18 months of development were worth the time and expense.
I feel your pain as well.....
I'd like to know what cam blank Web used to grind this cam, if it was integral the problem has been discovered... EVERY one of those I tested failed in less than 3 hours in the spin device.
Web's QC has slipped a bit in the past year and I have moved the majority of my cam grinding in house, only using Web for the 11 grinds of theirs that are "theirs"....
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- Joined: Mon Sep 01, 2003 12:59 pm
I know, religion is like childsplay compered. We have met at JPM's Dynoday, Frallan, and I will also keep my smile!Frallan wrote:Svwerker, you are on very dangerous grounds with your statement, even if you have a smile....
This is not just a website thread, it is as close to religion as you can get.
Be very careful....I know you well from all the Vdubs videos but I am not sure you know me too well by face?
One day we will meet at a VW event, will be fun to discuss TIV versus T1, right:) I will keep my smile.
I know Jonas to well not to comment this, his a funny man. No hard feelings, right?
I feel bad for every engine that fail. There is no joke about that!
- fastback
- Posts: 1670
- Joined: Wed Sep 12, 2001 12:01 am
BAd news....
I asume u checked the cam/lifter geometri to avoid the cam riding on the edge of the lifters??
interresting because:
Yesterday i torn apart a Type 4 that a friend of mine had just bought .
with only 1000km on it. using a cam that was stated "~301" total duration.
It had a "14" stamped were the camgear sit's.
When looking at the cam. there was only intake that was worn
it had a much more lift than the exhaust that was more or less the org shape.
there is only the area where two of the 4 lifters make contacton the sam lobe that was worn down.
What could be the possible cause of this??
could it be tolerance differences in the location of the liftebores on each crankhalves that makes the lifters not getting the same geometry?
If so you'd have to check each and every lifter/cam lobe for it's geometry?
it looked like this.
I asume u checked the cam/lifter geometri to avoid the cam riding on the edge of the lifters??
interresting because:
Yesterday i torn apart a Type 4 that a friend of mine had just bought .
with only 1000km on it. using a cam that was stated "~301" total duration.
It had a "14" stamped were the camgear sit's.
When looking at the cam. there was only intake that was worn
it had a much more lift than the exhaust that was more or less the org shape.
there is only the area where two of the 4 lifters make contacton the sam lobe that was worn down.
What could be the possible cause of this??
could it be tolerance differences in the location of the liftebores on each crankhalves that makes the lifters not getting the same geometry?
If so you'd have to check each and every lifter/cam lobe for it's geometry?
it looked like this.
- Piledriver
- Moderator
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- Joined: Sat Feb 16, 2002 12:01 am
XXX can snuff shots. Ugh.
I wonder if the cam edges were originally sharp or properly relieved... The sharp corners like to break off, they are very brittle, and very, very hard.
I wonder if the cam edges were originally sharp or properly relieved... The sharp corners like to break off, they are very brittle, and very, very hard.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
- func412
- Posts: 506
- Joined: Sun Apr 03, 2005 10:55 am
Looks bad!fastback wrote:Yesterday i torn apart a Type 4 that a friend of mine had just bought .When looking at the cam. there was only intake that was worn, it had a much more lift than the exhaust that was more or less the org shape. there is only the area where two of the 4 lifters make contacton the sam lobe that was worn down.
Just guessing...
Were the original pushrods used? I can just guess, but there is a possibility that the pushrod wasn´t installed right. I´ve installed twice the original pushrod incorrectly: the tip of the pushrod didn´t reach the bottom of the lifter cup because the wall of the pushrod contacted the lifter cup edge. Because of that the valve clearance might have got loose when running the engine (the pushrod tip reached the bottom of the lifter cup in use) and caused that failure. If the valve clearance is that loose, it might beat that lifter and break it.
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