[Healeys] 100 lifters
michael.oritt at gmail.com
Mon Aug 9 05:12:19 MDT 2021
In my race engines I use (non-street) Royal Purple RPX 10/40, which has a
high content of zinc and other elements, and then toss in a small container
of ZDDPlus. I change oil and filter after each race weekend and have not
lost a cam or any valve train components since starting to follow this
For my non-race 100 I usually use Castrol's "High Mileage" 10/40 and also
toss in a small bottle of ZDDPlus. Some people believe that cams and
lifters "absorb" zinc from the usual break-in oils which have high zinc
levels, making additives unnecessary. I err on the conservative side, and
except for the cost of a bottle of additive I see no disadvantage to this
practice, so as far as I am concerned it is "okay".
On Sun, Aug 8, 2021 at 9:08 PM Alan Seigrist <healey.nut at gmail.com> wrote:
> So adding zddp on top of whatever is in there is okay? I have Castrol
> 20W-50 in my motor... also use the Valvoline too.
> On Sat, Aug 7, 2021 at 11:11 PM Michael Oritt via Healeys <
> healeys at autox.team.net> wrote:
>> In about 2007 just before ZDDP content in motor oils became a commonly
>> talked-about issue in vintage racing communities, I bought a new race
>> engine for my MGA-powered Elva Courier from a reputable builder who
>> recommended I use Mobil 1. Somewhere during the first race weekend
>> performance fell off and upon disassembly it was determined that the cam
>> lobes had been damaged due to wear from the lifters.
>> After replacing the cam and lifters I began using RP racing oil and
>> throwing in ZDDP additive for good measure. Though the Royal Purple
>> probably contained sufficient zddp on its own and some folks
>> cautioned against too high levels of zinc I have continued this
>> combination and have not lost a cam, etc. since.
>> On Thu, Aug 5, 2021 at 11:16 PM Michael Salter <michaelsalter at gmail.com>
>>> The first sign of problems was having to adjust the tappets which had
>>> initially been silent after 2000 miles and then again at 4500.
>>> After adjusting they were still audible and had previously been silent.
>>> Then at the 2000 and 4000 mile oil changes there was "fir" in the drain
>>> plug magnet.
>>> I'm very disappointed to have destroyed a very low mileage "M" cam and a
>>> set of NOS lifters that I had been saving for decades.
>>> I'm seriously considering having silicon nitride lifters manufactured
>>> but at over $1000 a set its a serious investment.
>>> On Wed., Aug. 4, 2021, 10:47 a.m. Steven Kingsbury, <
>>> airtightproductions at icloud.com> wrote:
>>>> I just rebuilt my 100 engine and purchased my lifters from AH Spares in
>>>> the UK. These were their new design for better oil flow. I now have 1000
>>>> miles or so on the new engine and once I got my problems figured out with
>>>> my distributor, the car is running well and smooth.
>>>> Now I'm wondering when the other shoe is going to drop! What
>>>> problems did you have pointing you to the lifters as the source of those
>>>> problems? When I retorqued the head, I readjusted the rockers and found no
>>>> problems. They were a little off, but I expected a little.
>>>> What should I be looking for? I used Driven Break In oil and then I
>>>> switched to VR1 like you after 500 miles. I have been driving the car to
>>>> build up some trust in it and it's turning in to a joy to drive. I've got M
>>>> mods on this engine, cam, H6 carbs, M pistons and these new lifters. So
>>>> far, so good.
>>>> Thanks for your help,
>>>> Steven Kingsbury
>>>> On August 3, 2021 at 5:19 PM, Michael Salter via Healeys <
>>>> healeys at autox.team.net> wrote:
>>>> After only 6000 miles the NOS BMC lifters that I installed in my engine
>>>> with a very low mileage "M" cam have started to deteriorate.
>>>> This engine has had a steady diet of VR1 non synthetic and it has had 4
>>>> changes in 6K miles.
>>>> Very disappointing.
>>>> I'm considering trying bucket type Buick lifters with longer push rods
>>>> and a new cam.
>>>> Does anyone have experience with the durability of the old Buick
>>>> lifters ... getting a little desperate here.
>>>> Fortunately I caught this issue before it ruined the engine.
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