[Mk2] [Turbo] HKS or JUN Camshafts

[Lee @ 3S Service Centre]

TODA Racing High Power Profile Extreme Camshaft SW20

notice the CAMSHAFT with out the S.


cantfindausername - Lumpy idle is not in the bad tuning its when your cams are really agressive duration and the overlap is very high. This is what gives you the lumpy idle.

[sutton]

There still cheaper than HKS though, how much are the high lift HKS? all i can find are the 9.0mm lifts.

[RyanRs]

Yeah rev2's defo need the head machined. I got some 11.25mm custom specs, just shy of the hks 272 duration. Idled as smooth as stock. Lumpy idle is bad tuning if you ask me.

Totally agree. i think the only reason for a lumpy tickover other than bad tuning is if you are using huge injectors. like 1600cc+

Ant,the valve recesses on my pistons have been machined deeper than stock, yet afair rogue told me 10.5mm-11mm max but if your using 11mm+ then maybe rogue meant that as the max before it becomes 'non interference'

[cantfindausername]

Yeah huge injectors aren't gonna be able to get the small amounts of fuel in for nice tick over. Thats why they idle at about 2k RPM.

I'm pretty sure mine wont be non interference any more. Don't plan on finding out though so will just hope for the best

[Blacklightning66]

Why not ask Piper or Kent about cams for the 3SGTE.

A fair bit cheaper i would think and just the same at the end of the day

[bubbles]

the lift of a cam wont effect the idle enough to notice and any roughness can be mapped out, its the duration that will create lumpy/rough idle due to the overlap, overlap causes a lack of compression which creates the rough idle, with mild road cams you shouldnt feel the efftects of the slighlty increased overlap. For a real animal get some wcky ovelap going.
James.

[sutton]

Toda are the only high lift ones i can find at the moment. Anyone got any other recomendations of where to get some high lift cams?

For a real animal get some wcky ovelap going.

Don't suppose you know where can i get these sort of cams mate?

[bubbles]

Piper cams will make you any size cam you desire.

[sutton]

Piper cams will make you any size cam you desire.

So what would be the best lift and overlap to get on a cam without getting pistons machined?

Sorry for all the questions, just want the best setup

[3S Service Centre]

Thats a question for your engine builder who should advise on a whole list of other items too like compression ratio / tolerances / parts selection. Whats best will depend on the spec your building to and for.
James

[Rogue]

Toda are the only high lift ones i can find at the moment. Anyone got any other recomendations of where to get some high lift cams?

Yes - we do some, and they're nothing short of amazing! However the rest of the build needs to be carefully planned. The head will need machining just to allow them to turn...

Drop me a line if you want some more information.

Best regards,

Patrick Mortell
Rogue Motorsport Ltd
01676 530222

[llenrub]

Hi Chris

Thanks for the parts.

You may remember what I said when we met!

You could save yourself a fortune right now. A guy called Chris is selling a well modded MR2 on here for £7300. It's a cracker! Given that its all in working order, its an absolute bargain. You'll save yourself £13k. Everything you want to do he's done already. Fix your car and move it on mate.

I tell you, if I had my time again, I'd have his rather than rebuild mine!

[3S Service Centre]

Hi Chris

Thanks for the parts.

You may remember what I said when we met!

You could save yourself a fortune right now. A guy called Chris is selling a well modded MR2 on here for £7300. It's a cracker! Given that its all in working order, its an absolute bargain. You'll save yourself £13k. Everything you want to do he's done already. Fix your car and move it on mate.

I tell you, if I had my time again, I'd have his rather than rebuild mine!

Wise advise well worth considering.

James

[Century Motorsport]

Lets not forget here that if you are fitting anything higher lift than 9.5mm on the rev 1/2 cam followers you'll be flicking the shims out the bucket and destroying the head.

Shimless or shim 'under' bucket followers are ESSENTIAL for high lift cams + high revving engines.

Nathan

[salamanzer]

Yep as much lift as you can get away with.... with as little degrees as you need....

A lot of lift will allow you to make more power, minimal degrees of lift will allow you to have a car that idles well and spools quickly.

You might consider that the exhaust cam needs less degrees of lift compared to the intake cam, the less lift on the exhaust cam the quicker the turbo will spool!

Also if you are looking for a responsive engine, i would not open up the exhaust ports so don't oversize the valves! The more you allow the exhaust gasses to expand the slower the turbo will spool!

I would look at getting an exhaust cam with less duration of lift than the intake cam.... the more air you get in on the intake stroke the more power to you make, the less you allow the exhaust gasses to expand the faster your turbo will spool.

Some overlap between the 2 would be good, once you have decided on the cams and lift (more the better!) you can always advance the exhaust cams to assist in spool, and retard the intake cam to help in filling those cylinders with power producing oxygen

As stated your tuner will best assist you in the engine design, but looking at the HKS cams at 11mm of lift, and running a rev 3 they look like a very good offering bearing in mind the requirement of shimless or "under bucket" followers

Jason

[cantfindausername]

Remember that advetised duration isn't always "active" duration. You want to be concerned with duration from 1.0mm lift. So ramp angle will also be a concern. An agressive ramp will give you longer active duration for a given overall duration to that of an equivilent cam with not so agressive ramp.