2G HKS 272s Do I need to run aftermarket springs?

[Yoshida445]

I plan on putting some cams on my 2g, maybe something like HKS 272s but im not sure if i need to run aftermarket springs or if i can use the OEM ones

 

[Yoshida445]

You may or may not have to, it's a tough call with springs. 272s are right at the general limit and while it sucks because it's harder to replace them while the head is still on, there are tricks to do so. If that's not an issue then I just wouldn't risk stock springs with 272 ramp rates personally.

Someone on the thread said depends if the springs are old or not, the car has been sitting for a long time before i bought it and if i end up getting the BC cams i think its just better to replace the springs as well. I would rather figure out what springs work and do it correctly than risk bending valves and having to do the whole process again

 

[1990TSIAWDTALON]

If you are running BC cams, why not run BC springs?
Springs with Steel Retainers here:

BC0100S - Mitsubishi 4G63/Evo VIII/Evo IX Spring/Steel Retainer Kit – Official BC Brian Crower / runBC Online Store

Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. Type BC1100 Single Free Length 1.879" Seat 1.550" @ 84 lbs Open 1.000" @ 235 lbs Coil Bind...

store.briancrower.com

Or with Titanium Retainers here:

BC0100 - Mitsubishi 4G63/Evo VIII/Evo IX Spring/Titanium Retainer Kit – Official BC Brian Crower / runBC Online Store

Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. Type BC1100 Single Free Length 1.879" Seat 1.550" @ 84 lbs Open 1.000" @ 235 lbs Coil Bind...

store.briancrower.com

And BC's website says that you can run either stock or BC0100 springs with their 272 cams.

BC0101 - Mitsubishi 4G63 Stage 2 Camshafts - Street/Strip Spec – Official BC Brian Crower / runBC Online Store

Plug and play application. Short duration for nice street manners, slight lope at idle. Excellent all purpose spec. BC0100 or OEM spring OK. Adv Dur 268°/272° Dur @ .050 208°/212° Valve Lift (1.7:1) .401"/.381" Valve Lift (mm) 10.18/09.66 Cam Timing Tag

store.briancrower.com

Their NEW Stage 3 cams say that they REQUIRE the BC0100 Springs.

 

[curt-s]

Someone on the thread said depends if the springs are old or not, the car has been sitting for a long time before i bought it and if i end up getting the BC cams i think its just better to replace the springs as well. I would rather figure out what springs work and do it correctly than risk bending valves and having to do the whole process again

Yeah, me
Any aftermarket spring or the Evo8s will work with 272s. Once you really get up there, and especially above 280 like 284 or even higher, you'll want an crazier spring like a dual.

Anecdote, I still have stock cams but my springs were 30 years old, so BC0100s like Marty posted above is what I ended up putting in even just for peace of mind. I'd like a set of 264s or 272s though.. just have to pace my spending.

 

[Yoshida445]

Yeah, me
Any aftermarket spring or the Evo8s will work with 272s. Once you really get up there, and especially above 280 like 284 or even higher, you'll want an crazier spring like a dual.

Anecdote, I still have stock cams but my springs were 30 years old, so BC0100s like Marty posted above is what I ended up putting in even just for peace of mind. I'd like a set of 264s or 272s though.. just have to pace my spending.

Sorry I couldn’t remember that you said that . But the BC cams that I might plan to go with are BC0101 with the BC0100 springs

 

[Yoshida445]

If you are running BC cams, why not run BC springs?
Springs with Steel Retainers here:

BC0100S - Mitsubishi 4G63/Evo VIII/Evo IX Spring/Steel Retainer Kit – Official BC Brian Crower / runBC Online Store

Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. Type BC1100 Single Free Length 1.879" Seat 1.550" @ 84 lbs Open 1.000" @ 235 lbs Coil Bind...

store.briancrower.com

Or with Titanium Retainers here:

BC0100 - Mitsubishi 4G63/Evo VIII/Evo IX Spring/Titanium Retainer Kit – Official BC Brian Crower / runBC Online Store

Designed for high rpm, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. Type BC1100 Single Free Length 1.879" Seat 1.550" @ 84 lbs Open 1.000" @ 235 lbs Coil Bind...

store.briancrower.com

And BC's website says that you can run either stock or BC0100 springs with their 272 cams.

BC0101 - Mitsubishi 4G63 Stage 2 Camshafts - Street/Strip Spec – Official BC Brian Crower / runBC Online Store

Plug and play application. Short duration for nice street manners, slight lope at idle. Excellent all purpose spec. BC0100 or OEM spring OK. Adv Dur 268°/272° Dur @ .050 208°/212° Valve Lift (1.7:1) .401"/.381" Valve Lift (mm) 10.18/09.66 Cam Timing Tag

store.briancrower.com

Their NEW Stage 3 cams say that they REQUIRE the BC0100 Springs.

So which ones would be good the stage 2 or 3. And does the stage 3 have lope at idle as well like the 2?

 

[Spleen8urLSX]

Now I will say I’m throwing a set of BC 272’s in an otherwise stock head in another project, that one I have no plan to need to rev over 7k in that configuration so I’m using the 156k mile springs in that head without hesitation. My other head now has Evo 8 springs with it after experiencing the valve float.

 

[Spleen8urLSX]

So which ones would be good the stage 2 or 3. And does the stage 3 have lope at idle as well like the 2?

That all depends on various factors. If you’re running something like a 16g you wouldn’t want to go beyond the 272’s, if we’re talking stock turbo then you’re not ready to be swapping cams yet, if we’re talking a 600+ horsepower big turbo configuration then something in the 280 ballpark would make sense.

 

[Yoshida445]

That all depends on various factors. If you’re running something like a 16g you wouldn’t want to go beyond the 272’s, if we’re talking stock turbo then you’re not ready to be swapping cams yet, if we’re talking a 600+ horsepower big turbo configuration then something in the 280 ballpark would make sense.

Ohh so what about if im running a 20g turbo?

 

[Spleen8urLSX]

On a 20g I’d opt for the 272’s personally.

 

[92AWDHX40]

272s a good match for turbo, 272s on my old gsx rip, and ran, hks with evo 8 springs did just fine.

 

[Yoshida445]

On a 20g I’d opt for the 272’s personally.

Okay it wouldn’t matter if I just put BC springs and the BC0101

 

[1990TSIAWDTALON]

Not at all. The BC 0101 cam has a lift of 10.18/9.66mm lift. It is quite a bit more than stock but not into the radical or "race" type cam selection. It is a good all around pickup for the engine over stock, if everything else is fine. Duration is what you "hear", lift will give you more top end rpm's. The more duration out of a 360* circle that a cam has, the longer it keeps the valves open, allowing an ear to hear some of the explosion going on inside the combustion chambers. Not all cams that are listed as "272", have the same lift. Kelford and GSC both have almost another full mm of lift of the valve while keeping the valve open the same amount if time. I will link a cam spec thread if I can find it. The advertised duration is usually at .050" but is also given at .040, just fyi.
Just stuff that should be a given for knowledge but sometimes needs explaining.
Marty

Here it is and there are others.
Thread 'Big DSM Camshaft Specification Guide' https://www.dsmtuners.com/threads/big-dsm-camshaft-specification-guide.499757/

And
Thread '4G63 Camshaft Manufacturers and Models' https://www.dsmtuners.com/threads/4g63-camshaft-manufacturers-and-models.511413/

 

[Spleen8urLSX]

Yes, I should have clarified, my reference was in regards to BC’s duration listing, brands like to list off duration but for example while BC, HKS, and Kelford reference a 272 duration they’re all different cams with different specs overall from each other.

 

[Yoshida445]

Yes, I should have clarified, my reference was in regards to BC’s duration listing, brands like to list off duration but for example while BC, HKS, and Kelford reference a 272 duration they’re all different cams with different specs overall from each other.

Ohh okay thanks