Lextreme II
Active Member
Anyone know if Bullet cams are reground? Here are two pictures from my mate Daimen. The first picture is the stock and second picture is Bullet cam
Bullet Cams
- Thread starter Lextreme II
- Start date
The 1UZFE EGR Delete Kit is available for sale here.
Cast cam blanks can correctly be referred to as billets.
As an example, here is the first hit I got from google on the subject:
http://www.pdm-racing.com/products/cam_corner.html
With regards to cast and billet cranks, I agree that there is a generally accepted distinction between those cast, forged and machined from cylindrical billets (barstock).
Nevertheless, when it comes to camshafts, cast blanks are still widely referred to as billets.
Damien
New Member
The cams were about $1600 from memory and I specifically asked if they're regrinds or billet. The new heads are with my mechanic so I'll get him to measure the base circle.
The cam lobe is much bigger and wider than the stock cam so if they were regrinds they'd need a lot of extra matierial added then ground back - surely that would be obvious? Looks like a single casting to me.
The cam lobe is much bigger and wider than the stock cam so if they were regrinds they'd need a lot of extra matierial added then ground back - surely that would be obvious? Looks like a single casting to me.
Lextreme II
Active Member
Its definately modified stock. You can clearly see the cam where spammer would insert there to rotate the cam.
You don't want billet cams.
The best cams are made from cast iron as the pores in the casting hold oil. This makes the cam lobe "self lubricating" which ensures the followers last longer.
When I say "self lubricating" this doesn't mean they don't need an oil supply. It means they canhold or carry the oil long enough to lube the follower/cam interface.
A billet cam would be machined out of a solid piece of steel bar and would have a much finer grain/pores so it wouldn't hold the oil. Whilst it would be much stronger it would eat itself and the followers.
They certianly look like an homogenous piece. The price is the only thing that makes me wonder.
Kelford's charge more than Bullet and I would be surprised if anyone cna beat the Kelford price.
The best cams are made from cast iron as the pores in the casting hold oil. This makes the cam lobe "self lubricating" which ensures the followers last longer.
When I say "self lubricating" this doesn't mean they don't need an oil supply. It means they canhold or carry the oil long enough to lube the follower/cam interface.
A billet cam would be machined out of a solid piece of steel bar and would have a much finer grain/pores so it wouldn't hold the oil. Whilst it would be much stronger it would eat itself and the followers.
They certianly look like an homogenous piece. The price is the only thing that makes me wonder.
Kelford's charge more than Bullet and I would be surprised if anyone cna beat the Kelford price.
Damien
New Member
Just went back through my emails - they cost $1698 for the 4 of them. Good points about billet vs cast so these look more like they're ground from cast blanks.
My mechanic just called - the base circles are the same and the Bullet ones have an extra 1mm of lift. He said there's no way these are regrinds as there's no extra material welded to the nose.
I've also called Bullet and left a message for Tom Rabold to call me back so I can ask him how they're made.
Those photos were taken with different amounts of zoom and are really too small to do any kind of meaningful comparison.
My mechanic just called - the base circles are the same and the Bullet ones have an extra 1mm of lift. He said there's no way these are regrinds as there's no extra material welded to the nose.
I've also called Bullet and left a message for Tom Rabold to call me back so I can ask him how they're made.
Those photos were taken with different amounts of zoom and are really too small to do any kind of meaningful comparison.
1ndecent,
Sorry don't agree.
On that basis a cast crank is actually a billet crank, because it is machined from a casting. I don't think so.
Looking at the photos we need to bear in mind the longer lobe makes the base circle look smaller.
Damien,
You better tell your insurer about those cams!
)
Sorry don't agree.
On that basis a cast crank is actually a billet crank, because it is machined from a casting. I don't think so.
Looking at the photos we need to bear in mind the longer lobe makes the base circle look smaller.
Damien,
You better tell your insurer about those cams!
)
Lextreme II
Active Member
Recently we just regrind some stock cams. This will be install very soon with some objective dyno numbers. We are still waiting for some thinner shims. Lextreme Cams
1ndecent,
Sorry don't agree.
On that basis a cast crank is actually a billet crank, because it is machined from a casting. I don't think so.
Looking at the photos we need to bear in mind the longer lobe makes the base circle look smaller.
Damien,
You better tell your insurer about those cams!
Cast cam blanks can correctly be referred to as billets.
As an example, here is the first hit I got from google on the subject:
http://www.pdm-racing.com/products/cam_corner.html
With regards to cast and billet cranks, I agree that there is a generally accepted distinction between those cast, forged and machined from cylindrical billets (barstock).
Nevertheless, when it comes to camshafts, cast blanks are still widely referred to as billets.
1ndecent,
On that basis you don't need to even say "billet" as any camshaft is made from a billet.
Even a welded and ground cam is still a billet.
I think people use the word "billet" to suggest the product is some hi quality fancy machined super tough super expensive number when a billet cam is just a lump of cast iron!
I guess that means I only use "billet" nuts and bolts to hold my "billet" engine together.
On that basis you don't need to even say "billet" as any camshaft is made from a billet.
Even a welded and ground cam is still a billet.
I think people use the word "billet" to suggest the product is some hi quality fancy machined super tough super expensive number when a billet cam is just a lump of cast iron!
I guess that means I only use "billet" nuts and bolts to hold my "billet" engine together.
striker
New Member
I thought that, keep in mind english is not my native language,
a Billet Item was always machined from a Bar of solid cast material ie when the biggest diameter of the cam is 10cm the bar that it's machiened out of needs to be slightly bigger than that. this requires a lot of machining
and a cast machiened item is, cast in a form roughly the shape of the cam and then machined to spec, ie not machiened from a solid bar of material.
in the end the Billet item would be stronger, but whether that's neccesary for cams is beyond me. though i think not. in the end everything is cast or presurecast formed anyway.
grtz Thomas
a Billet Item was always machined from a Bar of solid cast material ie when the biggest diameter of the cam is 10cm the bar that it's machiened out of needs to be slightly bigger than that. this requires a lot of machining
and a cast machiened item is, cast in a form roughly the shape of the cam and then machined to spec, ie not machiened from a solid bar of material.
in the end the Billet item would be stronger, but whether that's neccesary for cams is beyond me. though i think not. in the end everything is cast or presurecast formed anyway.
grtz Thomas
