[Healeys] 100 lifters

[Michael Oritt]

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.

YMMV....

On Thu, Aug 5, 2021 at 11:16 PM Michael Salter <michaelsalter at gmail.com>
wrote:

> 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.
>
> M
>
> 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
>> BN1
>>
>> 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.
>>
>> M
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-- 
Best--Michael
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