Cam Wiping after 600 Miles :( - LotusTalk - The Lotus Cars Community

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post #1 of 16 (permalink) Old 02-15-2017, 12:34 PM Thread Starter
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Cam Wiping after 600 Miles :(



So I pulled the valve cover last night “just for peace of mind” - it's been a few months since I replaced the wiped cam from the previous owner. I mean, there is no way the cam is wiped after 600 miles…. Right?

Wrong. It is already showing signs of being wiped. UNBELIEVABLE. THIS IS CRAP!

600 miles ago.....

• New OEM cam and rockers
• Valve lash measured/ adjusted to .012+ on all valves
• All parts slathered in assembly lube
• 300 miles of break in driving without hitting the big cam
• Bypassed the oil coolers – removed the sandwich plate
• Mobil 1 5w-40 Turbo Diesel oil
• Always waited ten minutes AFTER coolant temp shows 185 to get on big cam

600 miles later the cams are getting wiped.

This is crazy. I’m a mechanical engineer in my mid 40’s. I run a factory of over 700 people. I am not some dumb kid that makes stupid mistakes. Over the last 20 years I have had Porsches, BMW's, Mercedes – all maintained myself, all driven “as they should be” – including track time, with ZERO major issues. I am meticulous, organized, and I research like crazy before I take action. I can’t get this damn lotus (With a Toyota motor!) to last for 1000 miles.

Please Help ! What am I doing wrong ??? I’ll sell this POS if I have to replace cams every 1000 miles. What really gets me is no one really knows what the root cause of this problem is, so you are just guessing on corrective action. Ridiculous.

Fed up.
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post #2 of 16 (permalink) Old 02-15-2017, 12:39 PM
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Well...that's disheartening.
There goes my oil temp theory...
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post #3 of 16 (permalink) Old 02-15-2017, 12:43 PM
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Aftermarket cams- problem solved, OEM's material is lottery...
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post #4 of 16 (permalink) Old 02-15-2017, 01:33 PM
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Is there any possibility that the diesel oil is just not right
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post #5 of 16 (permalink) Old 02-15-2017, 01:51 PM
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I have heard that some have done a quasi analysis of the oil shower lines above the head do not actually shoot oil where it should be.

It's random thought, but I have a Lotus member out here who needs help with the same scenario... He is on his 3rd I believe...

You even did it right the first time and replaced all the rockers and everything. Maybe investigate exactly where the oil goes pressurized. No idea where that thread is? If it was not on LT it might have been on newcelica.org




Just a possible lead. The thread in question even had technique to be clear where oil was going. I think he just used pressurized water or something and did a plot that matched the head. The spray on more than one aperture was def going the wrong way. It is one possible cause to investigate for those with multiple cam wear issues... If I recall he figured what the correct angles should be and enlarged the openings in the correct way so that the oil was going where it was designed to go.

L O T U S

Last edited by Motard; 02-15-2017 at 02:04 PM.
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post #6 of 16 (permalink) Old 02-15-2017, 02:31 PM
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Metallurgy

Do you have any metallurgy contacts that you could work with. It looks to me like the cam is not hard enough. If that's the case, then the supplier needs to hear about it.
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post #7 of 16 (permalink) Old 02-15-2017, 02:33 PM
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Quote:
Originally Posted by Motard View Post
I have heard that some have done a quasi analysis of the oil shower lines above the head do not actually shoot oil where it should be.

It's random thought, but I have a Lotus member out here who needs help with the same scenario... He is on his 3rd I believe...

You even did it right the first time and replaced all the rockers and everything. Maybe investigate exactly where the oil goes pressurized. No idea where that thread is? If it was not on LT it might have been on newcelica.org




Just a possible lead. The thread in question even had technique to be clear where oil was going. I think he just used pressurized water or something and did a plot that matched the head. The spray on more than one aperture was def going the wrong way. It is one possible cause to investigate for those with multiple cam wear issues... If I recall he figured what the correct angles should be and enlarged the openings in the correct way so that the oil was going where it was designed to go.
The sprayers are so close that the general consensus is that the angle of spray shouldn't matter.
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post #8 of 16 (permalink) Old 02-16-2017, 05:53 AM Thread Starter
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One "solution" that I am considering is installing MWR Stage II cams and upgrading the valve springs. Has anyone wiped a MWR Camshaft ? I've read that they test significantly harder on the rockwell "C" scale.
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post #9 of 16 (permalink) Old 02-16-2017, 06:40 AM
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Quote:
Originally Posted by Familyman951 View Post
One "solution" that I am considering is installing MWR Stage II cams and upgrading the valve springs. Has anyone wiped a MWR Camshaft ? I've read that they test significantly harder on the rockwell "C" scale.
It seems any of the aftermarket cams are more highly regarded than OE

"Lots Of Trouble; Usually Serious"
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post #10 of 16 (permalink) Old 02-16-2017, 07:20 AM
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I keep thinking I should pull my valve cover and look at my cams...and I keep chickening out because the car runs fine and I have enough car projects going on....

Nick____________
2005 Elise - Chrome Orange - See Pics and Mods in My Garage (Disclaimer-I am a novice and pretend to know just enough to be dangerous (I have the scars to prove it). By reading my post you accept that I am not responsible for any bodily harm, mental anguish, material and/or monetary losses that may result from anything you choose to do based upon my shared experiences.)
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post #11 of 16 (permalink) Old 02-16-2017, 08:21 AM
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post #12 of 16 (permalink) Old 02-16-2017, 08:26 AM
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Quote:
Originally Posted by Familyman951 View Post
One "solution" that I am considering is installing MWR Stage II cams and upgrading the valve springs. Has anyone wiped a MWR Camshaft ? I've read that they test significantly harder on the rockwell "C" scale.
I would like to hear about this option also. Does anybody have any first hand experience with aftermarket cams in a otherwise stock motor?
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post #13 of 16 (permalink) Old 02-16-2017, 10:17 AM
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We did a lot of Rockwell testing years back (JCR and us, the royal "we")... tested the rockers, the cams, OE and aftermarket. Yes, the aftermarket cams are much harder... There is a happy medium as we took the efforts to fortify the stock cams with various treatments to improve the surface durability. The problem went the other way and our super OE cams ate through the rockers... The hardening process certainly impacted the lubricity of the material.... Nevertheless, it's rare to see aftermarket cams fail. Not unheard of, however, but rare.

People celebrate the Yamaha head. I've never figured out why... That said, the lions share don't have cam problems, so there's that too...

-Phil


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post #14 of 16 (permalink) Old 02-16-2017, 12:39 PM
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Is it possibly the oil? I know factory does suggest 5w30 for the 2zz.
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post #15 of 16 (permalink) Old 02-16-2017, 12:53 PM
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The synthetic diesel oil was generally accepted as a standard going ack to something like 2013 and before due to it having slightly higher ZDDP than gasoline oil. We've used Redline Race oils for years and the reality is that we've seen the cams wipe with every oil imaginable, with and without ZDDP additives, etc...

The issue does not seem to be linked to oil.

-Phil


Phil: NASA 2012 and 2014 TT1 Central Champion, 2005 GG Elige, Rev400, 400+whp

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post #16 of 16 (permalink) Old 02-16-2017, 02:43 PM
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My second head likes to eat cams. I ran .018 clearance all around. Ate mutiple stock cams and one stage 3 intake cam.
Roller rockers solved that problem. Running wide lash solves most wipping. .012 is too tight IMHO . My first " stock " head
didnt wipe cams ( 13,000 miles ) .

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