roller cam conversion

[micsnaffled]

Got a vs ss with standard hydrolic flat tappet cam and lifters in a v8, want to convert to a roller can setup. Anyone know what's needed??

[Munz]

To fit to a non roller block need link bar type roller lifters plus roller camshaft

[micsnaffled]

I'm trying to sort out a brand that is going to fit my car, vr ss.
Do I need a cradle, like in the vs vt??
Most roller lifters have this cross bar between them but some are for chev some are splayed??? Need a couple of brands that can suit my car!
Something about a billet cam gear as well yeh?? Any reason why I should go roller as a pose to flat tappet??
Cheers all!!

[Munz]

roller cams also have a great performance advantage over the flat tappet. The faster you can get the intake valve to maximum lift, the longer it can stay there before the piston comes rushing back up the cylinder to compress the air fuel mixture. If the goal is to load the cylinder with as much air and fuel as possible, the longer you are at maximum lift the better. Flat tappets require a smoother transition from the base circle of the cam to max lift, leaving less time for the lifter to dwell there. Roller lifters, on the other hand, can survive a much more abrupt transition resulting in extra time at max lift. If you compare a roller cam lobe to a flat tappet lobe, you can see the roller cam has a larger radius at its peak, holding the lifter at max lift for a longer duration.

http://www.lunatipower.com/Tech/Cams...tOrRoller.aspx


ask steve @ MACE for advice (site sponser) as he does cam packages for the 304 5L

[micsnaffled]

Awesome cheers!!!
Speaking to mace about a throttle body, so I'll hit him up with the cam selection while I'm at it!!!
Cheers!!
Rebuilding the engine today!!
Not ready for 2 weeks
Can't wait!!!

[dirt drifter]

i've heard the lifter bores might need to be sleeved as well

[micsnaffled]

Why the need??
Aren't they suited to the block??
Are the smaller width wise than a hydrolic lifter??
What about height size??
I'll investigate further, Friday is the day he's calling about head flow rates, the condition of all parts( most of them will be discarded) and what roller lifters and cam we will use, I'll hit him up then, cheers!!
I've posted another... whatever and it's about my rebuild. Having problems with manifold choice, selection is proving to be hard, this intern will stuff up cam choice and head work!!
Time is running out, as the car was handed over today! Bugger

[dirt drifter]

dunno thats just what ive heard..

on the subject of manifolds, a mate has a vk 355 with a vt roller block, hyd roller cam, and a harrop dual plane manifold with an 830cfm (i think) barry grant carby on it. it works well, responsive as anything and all fits under the bonnet. he's real happy with it

[micsnaffled]

Being in a vk, he can run it carby style while having a roller cam. I'm efi and can't do that!
I've found my roller cam setup now for my vr v8 build
Cheers all

[dirt drifter]

u could if u got a 4 barrel throttlebody (looks like a carby). i'm pretty sure the harrop and torque power manifolds have injector bosses cast into them so u can get some injectors and fuel rails on there

[micsnaffled]

I've had heaps of problems with the EPA. I would love to go throttle carby style but if I was to get pulled over, (like I have in the past and had to change my manifold back to a standard one) it would kill me!! What then??? Go back to standard, new tune... $$$$ for nothing!!
Going to be a come or motec manifold
Ready for a turbo (hidden)!!
Cheers!!!

[micsnaffled]

Harrop torque all those high rise manifolds need a hole in the bonnet even without a spacer. Come do a dual plain high rise with a 1" spacer fits all under the bonnet.
Still EPA is a problem, all the brake booster hoses I think need to be plumbed in, all sensors. $$$$
Hot air is another one. No holes!!