reground and billet camshaft diffrences
- Thread starter ragz
- Start date
Aga
Member +
reground cams have metal eaten from the round part of the cam, not the protruding lobe. so, you readjust the tolerances by changing the shims on the buckets, and when the valve opens, you have more lift. this poses a problem on high lift reground cams which will need fabrications on the shims and buckets cause toyota shims dont go so high in thickness...
the pros of a billet cam is more reliability and no need to readjust the shims for higher lift, just the usual adjustment for good tolerances.
the pros of a billet cam is more reliability and no need to readjust the shims for higher lift, just the usual adjustment for good tolerances.
hardcoreep
Member +
On a reground cam they build up material on the provided cam lobes then machine it to the specifications given.
A billet cam is cast from either a mould or machined from a solid block of metal using precise machinery, such a a CNC machine.
The reground cam is dependent on the skill of the person doing the regrind to get as close as possible to uniformity across all lobes and within factory operational specifications. The quality of the cams are also dependent on the materials used and even the cam itself.
Regrinds are cheap because they don't require building a camshaft from ground up, and manufacturing disunity is expected. This is why you must reshim. I've had problems with reground lobes wearing themselves away and I also find them noiser (heavier ticking noise as they activate the valves).
Billets are expensive, but don't require any shimming so its a plug and play situation. They can also be made in higher lift/duration increments than regrinds.
You need to offset the cost of the billets verses having to pull the head apart and reshimming.
A billet cam is cast from either a mould or machined from a solid block of metal using precise machinery, such a a CNC machine.
The reground cam is dependent on the skill of the person doing the regrind to get as close as possible to uniformity across all lobes and within factory operational specifications. The quality of the cams are also dependent on the materials used and even the cam itself.
Regrinds are cheap because they don't require building a camshaft from ground up, and manufacturing disunity is expected. This is why you must reshim. I've had problems with reground lobes wearing themselves away and I also find them noiser (heavier ticking noise as they activate the valves).
Billets are expensive, but don't require any shimming so its a plug and play situation. They can also be made in higher lift/duration increments than regrinds.
You need to offset the cost of the billets verses having to pull the head apart and reshimming.
HYBRID
Super Moderator <a href="http://www.toyotagtturbo.
theres also the risk of reprofled cams eating themselves to death... iv seen way to many sets of reprofiled cams go wrong here in malta... the oem cams have a hardner coating on them, once reprofiled they come much softer than when they where untouched..
personally id either go for 5e-fhe or some billet cams as its not worth the risk of having to take the engine apart from top to bottom & change many things from the sump up....
kon
personally id either go for 5e-fhe or some billet cams as its not worth the risk of having to take the engine apart from top to bottom & change many things from the sump up....
kon
Adam_Glanza
Member +
i agree hybrid, for the sake of an extra 2/300 quid, your probably saving yourself thousands in the long run 
Aga
Member +
oi hybrid. do those that have gone bad had cruise valvesprings? do you think there's a pattern? im undecided about leaving the cruise springs on , cause they are so damn hard!
HYBRID
Super Moderator <a href="http://www.toyotagtturbo.
yo al
well most of them yeah had cruise valvesprings, the thing is ur getting the cams to rev more, now with oem springs u cant rev that much cause of valve bounce.. i think its more to the fact that damage happens to them when the engine falls "under cam" if u know what i mean, as they will b turning so slowly.. well thats what we think, also the idle shouldt be lower than 1200rpms...the ones with reground cams & full ecu's havent had any problems, its only ppl that dont use idle control that have these probs...
didnt u get them hardened? that should solve the problem... (i hope)
Toby@ToyTuning.com
Banned - DO NOT BUY FROM TOYTUNING
We offer both regrounds and billets, regounds are not a pain shims are not more than £40.00 we fit them all the time, instead of using one thick shim we use one on top and the bottom of the bucket. Yes billets are easier to install but it's marginal, we wouldn't charge and difference expect for shims.
It's down to budget and needs as some just can't afford to stump up £500.00 + when the others are half the price. We run pipers reprofiles in number two and Cruise billets in no1. As someone said it's down to the quality of the maker, piper have been making cams for years and we've yet to have a problem, as long as the shims are correct then they will be 100% fine.
If you have the money then go for some billets they will always be better but for most a set of reprofiles will do the trick considering most don't go too mad. If you've gone full hog then billets all the way.
It's down to budget and needs as some just can't afford to stump up £500.00 + when the others are half the price. We run pipers reprofiles in number two and Cruise billets in no1. As someone said it's down to the quality of the maker, piper have been making cams for years and we've yet to have a problem, as long as the shims are correct then they will be 100% fine.
If you have the money then go for some billets they will always be better but for most a set of reprofiles will do the trick considering most don't go too mad. If you've gone full hog then billets all the way.
GTti
Member +
I have 270 spec regrinds from Piper in the GTxx, they've been in there for 12,000 miles. Idle is quite lumpy and it does need a fair few revs to pull away, especially with a lightened flywheel.
You're better off with billet cams if you can afford them - more durable and worry free. But nothing wrong with regrinds.
You're better off with billet cams if you can afford them - more durable and worry free. But nothing wrong with regrinds.