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Perry,
Ii was a Buick Straight-8 (Fireball 8) engine from 1931 to 1953. The =
small block version, up to 273 cubic inch capacity came with lifters and =
push rods that could be dropped in a Healey 4-cylinder. The lifters were =
considerably lighter, especially if one added an oil drain hole to the =
lubricate the cam and not have to lift a bucket of oil each revolution. =
The push rods were slightly larger in diameter and appeared to my eye to =
be stronger. The Buick lifter and push rods coupled with Dodge valves =
and titanium valve spring caps was the hot set up. When joined by an =
Isky or Crane cam, rumors were a 4-cylider could touch 8,000 rpm for =
brief moments. I was never able to verify the 8,000 rpm story told by =
some Southern California BMC dealers in the late 50s and early 60s. In =
1961, I ran the Buick lifters and push rods with an Isky =C2=BE race cam =
in a ported head. My personal rpm limit remained 4,800 rpm. Mid-range =
torque was improved per my butt meter.
=20
The Healey-Hunter DOHC conversion engine race redline was 7,000 rpm. =
Their cranks were fully polished and ran with lighter pistons and rods. =
Avoiding resonance frequencies, especially around 5,200 rpm was =
understood. In their very limited race life, no crank failures were =
noted, but rapid cam wear was.=20
=20
Does anyone know what race rpm limit some Healey 4-clynders engines are =
running these days with a steel billet crank, lighter internals, and a =
somewhat reinforcing cast aluminum sump?
Hap Polk
100M
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Perry via =
Healeys
Sent: Monday, April 27, 2020 6:51 PM
To: Wayne Schultz <waschu2@gmail.com>; healeys@autox.team.net
Subject: Re: [Healeys] Oil Additives
=20
Listers / Wayne
I was thinking about the way the cam lobes are lubricated in the =
original configuration ( stock parts). Please chime in if this is way =
off.=20
It would seem most of the lubrication comes from the steady drip that =
comes out at the rocker and runs down the pushrod. First the tappets =
(lifters) get some oil, then passes by the lifter and then on to the cam =
lobe.=20
The oil dripping from the rocker shaft bushings drips onto the top of =
the head and drops through the pushrod holes to the lifter gallery. On =
some worn out engines this is a flood instead of a drip. Then you have =
the oil fog that is in the crank case/oil pan area when the engine is =
running due to the squirt of oil coming out of the piston rods big ends. =
The intent was to oil down the piston bores but coats pretty much =
everything.
The bucket lifters, which by the way was an old hot rod trick from the =
early days of Austin Healeys, using lighter weight lifters out of a =
straight eight Oldsmobile (if I remember correctly) and longer pushrods =
may or may not be drilled to allow oil to the cam lobe/lifter face. Some =
guys used pressurized oil to squirt the interface when the bucket was =
not drilled. The bucket lifters sold years ago that did not have a hole =
in the lifters had failure problems. A hole was added but the problem =
with the drilled hole in the bucket it could clog and there was little =
to no lubrication of the cam lobes, thus major wear. =20
I=E2=80=99m not suggesting that the can lobe failure was caused by a =
plugged hole in the lifter since I did not work on this engine. But it =
is a possibility.=20
Perry
=20
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=3D550986> for =
Windows 10
=20
Sent: Monday, April 27, 2020 4:49 PM
Subject: [Healeys] Oil Additives
=20
Hello everyone, I recently completed a rebuild of the engine in my =
Healey 3000. At 48K miles i noticed metal during an oil change. I =
dropped my oil pan and found even more metal and a silver ring in the =
block that lined up with a cam lobe. I had been using Mobil 1 for years =
and always had good oil pressure and a very quiet motor. I pulled the =
motor and upon teardown I found one bad cam lobe and several lifters =
that had mild pitting. I thought about how I used my car and came to =
conclusion I, rather than the oil might be the reason for the cam =
failure. I drove my car every couple of weeks in nice weather. This is =
just enough time for the oil to leave the cam and lifters to drain into =
the pan. This meant the next time I started the engine the cam and =
lifters might have been metal on metal. My new lifters are short bucket =
lifters with a drain hole to lubricate the cam lobes. Now using VR-1 =
20/50
=20
=20
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vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>Perry,<o:p></o:p></p><p class=3DMsoNormal>Ii was a =
Buick Straight-8 (Fireball 8) engine from 1931 to 1953. The small block =
version, up to 273 cubic inch capacity came with lifters and push rods =
that could be dropped in a Healey 4-cylinder. The lifters were =
considerably lighter, especially if one added an oil drain hole to the =
lubricate the cam and not have to lift a bucket of oil each revolution. =
The push rods were slightly larger in diameter and appeared to my eye to =
be stronger. The Buick lifter and push rods coupled with Dodge valves =
and=C2=A0 titanium valve spring caps was the hot set up. When joined by =
an Isky or Crane cam, rumors were a 4-cylider could touch 8,000 rpm for =
brief moments. I was never able to verify the 8,000 rpm story told by =
some Southern California BMC dealers in the late 50s and early 60s. In =
1961, I ran the Buick lifters and push rods with an Isky =C2=BE race cam =
in a ported head. My personal rpm limit remained 4,800 rpm. Mid-range =
torque was improved per my butt meter.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>The =
Healey-Hunter DOHC conversion engine race redline was 7,000 rpm. Their =
cranks were fully polished and ran with lighter pistons and rods. =
Avoiding resonance frequencies, especially around 5,200 rpm was =
understood. In their very limited race life, no crank failures were =
noted, but rapid cam wear was. <o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Does anyone =
know what race rpm limit some Healey 4-clynders engines are running =
these days with a steel billet crank, lighter internals, and a somewhat =
reinforcing cast aluminum sump?<o:p></o:p></p><p class=3DMsoNormal>Hap =
Polk<o:p></o:p></p><p class=3DMsoNormal>100M<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Perry via =
Healeys<br><b>Sent:</b> Monday, April 27, 2020 6:51 PM<br><b>To:</b> =
Wayne Schultz <waschu2@gmail.com>; =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Oil =
Additives<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Listers / =
Wayne<o:p></o:p></p><p class=3DMsoNormal>I was thinking about the way =
the cam lobes are lubricated in the original configuration ( stock =
parts). Please chime in if this is way off. <o:p></o:p></p><p =
class=3DMsoNormal>It would seem most of the lubrication comes from the =
steady drip that comes out at the rocker and runs down the pushrod. =
First the tappets (lifters) get some oil, then passes by the lifter and =
then on to the cam lobe. <o:p></o:p></p><p class=3DMsoNormal>The oil =
dripping from the rocker shaft bushings drips onto the top of the head =
and drops through the pushrod holes to the lifter gallery. On some worn =
out engines this is a flood instead of a drip. Then you have the oil fog =
that is in the crank case/oil pan area when the engine is running due to =
the squirt of oil coming out of the piston rods big ends. The intent was =
to oil down the piston bores but coats pretty much =
everything.<o:p></o:p></p><p class=3DMsoNormal>The bucket lifters, which =
by the way was an old hot rod trick from the early days of Austin =
Healeys, using lighter weight lifters out of a straight eight Oldsmobile =
(if I remember correctly) and longer pushrods may or may not be drilled =
to allow oil to the cam lobe/lifter face. Some guys used pressurized oil =
to squirt the interface when the bucket was not drilled. The bucket =
lifters sold years ago that did not have a hole in the lifters had =
failure problems. A hole was added but the problem with the drilled hole =
in the bucket it could clog and there was little to no lubrication of =
the cam lobes, thus major wear. <o:p></o:p></p><p =
class=3DMsoNormal>I=E2=80=99m not suggesting that the can lobe failure =
was caused by a plugged hole in the lifter since I did not work on this =
engine. But it is a possibility. <o:p></o:p></p><p =
class=3DMsoNormal>Perry<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Sent from <a =
href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986";>Mail</a> for =
Windows 10<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From: </b><a =
href=3D"mailto:waschu2@gmail.com";>Wayne Schultz</a><br><b>Sent: =
</b>Monday, April 27, 2020 4:49 PM<br><b>To: </b><a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a><br><b>S=
ubject: </b>[Healeys] Oil Additives<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>Hello =
everyone, I recently completed a rebuild of the engine in my Healey =
3000. At 48K miles i noticed metal during an oil change. I dropped my =
oil pan and found even more metal and a silver ring in the block that =
lined up with a cam lobe. I had been using Mobil 1 for years and always =
had good oil pressure and a very quiet motor. I pulled the motor =
and upon teardown I found one bad cam lobe and several lifters that had =
mild pitting. I thought about how I used my car and came to =
conclusion I, rather than the oil might be the =
reason for the cam failure. I drove my car every couple of weeks =
in nice weather. This is just enough time for the oil to leave the cam =
and lifters to drain into the pan. This meant the next time I started =
the engine the cam and lifters might have been metal on =
metal. My new lifters are short bucket lifters with a drain hole =
to lubricate the cam lobes. Now using VR-1 =
20/50<o:p></o:p></p></div><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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