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Author Topic:   synthetic oil and flat tappet cams....
stockcar5
Dirt Forum Champ
Total posts: 578
posted December 14, 2004 11:03 AM  
i was wondering why some people say you dont want to run synthetic oil with a flat tappet cam. i have talked to several engine builders and cam manufactures and have gotten different answers. some say its ok and some say no not at all. why is this? i know you need dino oil to break the cam in but after that i'd like to run royal purple or mobil 1. i ran it last year and it seemed ok. but this year i went wih a camcraft cam with edm lifters and i dont want to have any cam trouble.

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nw15x
Dirt Maniac

Total posts: 129
posted December 14, 2004 11:13 AM  
I have used Mobil1 for 7 years with EDM lifters and you can hardly meassure any wear on the cam. I have one cam I have used for 3 years and its within 2-3 thousands from spec.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted December 14, 2004 11:37 AM  
WE have been using synthetic on flat tappet cams for 5 years now. First mobil 1 and now Royal Purple. Never have had any cam trouble let alone oil related.

allzway
Dirt Maniac

Total posts: 136
posted December 14, 2004 12:21 PM  
What weight Mobil 1 do you guys use?

This last season I ran the Valvoline 20-50w racing dino oil.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted December 14, 2004 01:39 PM  
there's also an oil absorbing coating you can have applied to your cam. it costs about $35 per cam and the company that does it here claims they've never had one go flat with this coating on it.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted December 14, 2004 01:49 PM  
mobil1 15w50

marshalr
Dirt Maniac

Total posts: 148
posted December 14, 2004 03:52 PM  
You can add my name to the synthetic only crowd. Mobil 1 15w - 50;I've experienced several years of outstanding performance. I've measured engines after 1000s of laps, wear is almost unmeasurable and the high heat/stress capabilities are cheap insurance even considering the high initial cost of the oil.
Smokey Yunick said that if you are not pouring synthetic oil in your pan or tank you are going backwards.

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stockcar5
Dirt Forum Champ
Total posts: 578
posted December 14, 2004 06:28 PM  
what about the theory that synthetic oil is "to slick". and it keeps the lifters from rotating? oil thats to slick sounds about the same as having to much money to me!!

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nw15x
Dirt Maniac

Total posts: 129
posted December 14, 2004 07:07 PM  
i think you are thinking too hard

chomme
Dirt Freak

Total posts: 300
posted December 14, 2004 10:23 PM  
royal purple 15w40 here and zero cam problems .Like others said 3 years on the cam and lifters hardly any wear.

driver27
Dirt Maniac

Total posts: 194
posted December 15, 2004 09:47 AM  
How long do you guys run mobil 1 between oil changes?

Thanks

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted December 15, 2004 10:37 AM  
Barring any odd circumstances, 6 nights total, changing the filter every other night.

On another note. Mobil 1 states that it is not compatible with alky. If you have a tendency to run rich or have excess fuel make it into the crankcase then I would look at Royal Purple 41. It is made to work with alky fuels. Now that being said we ran Mobil 1 w/ alky for 3 years and never had trouble, but never had fuel washdown issues. On gas either one is good, the RP is a little higher priced though.

Woodrow
Dirt Newbie

Total posts: 2
posted December 15, 2004 02:13 PM  
They have lowered the standards in the definition of "synthetic oil" since they were originally introduced to the market. Some barely have enough additive to motor oil to fall in this definition and they charge the prices of the real stuff. Just do some homework before using it.

strstckracer
Dirt Roller

Total posts: 23
posted December 15, 2004 08:48 PM  
Valvoline 20W-50

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