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Old 07 Oct 2012, 01:11 pm
jim beam
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Default Re: New oil maybe not so good for classic engines

On 09/24/2012 07:47 AM, Scott Dorsey wrote:
> m6onz5a<> wrote:
>> On Sep 20, 11:31=A0pm, bob urz<> wrote:
>>> bob

>> I guess all classic car owners will be going to performance shops to
>> buy their oil.

> Or more likely to the truck stops. Many of the diesel engine oils have
> reasonable ZDDP levels. Rotella T seems to be the favorite of the classic
> car guys I know and it's not very expensive.

even rotella is well below old zddp levels these days. i'll bet that
diesel fleet managers are starting to get pissed round about now.

> I think how important this is also depends a lot on just how much spring
> pressure is on those cams. Some of those high performance V-8s have a
> huge amount more force than something like a BMW M30, and that makes ZDDP
> levels a lot more important.

this is correct. here's a civic cam [relatively high lift compared with
some other cam profiles] clearly showing the "break-through" point that
results from spring pressure.

in the old days of higher zddp levels, civic cams used to look uniform
throughout the contact zone, even at high mileage. today, all look
distressed from direct metal-to-metal contact above line 2, and many
look distressed above line 1.

fact check required
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