Cams

[Tealsh23]

What’s the best cam to run on stock valves and springs. Besides oem was looking at 264/272 or 280s but not sure which ones I can run on stock springs

 

[T Series Boost]

I'm running BC 272s on stock springs, but it's probably not recommended.

 

[Tealsh23]

I'm running BC 272s on stock springs, but it's probably not recommended.

So probably 264?

 

[1990TSIAWDTALON]

You need to know coil bind for the stock springs so you don't get too much lift on the cam.

See these.

How Much Valvespring Coil-Bind Clearance Is Safe?

“Coil bind” occurs when a spring’s coils stack solid at or before full camshaft lift. How Much Valvespring Coil-Bind Clearance Is Safe?

www.motortrend.com

and see the attachment.

What are your goals here?

 

[Spleen8urLSX]

If it says anything some get away with BC 272’s (not all 272’s but I should say the less aggressive ones like BC) on stock springs, some do not. I got away with it, however on a bigger turbo (Borg s363) I was seeing valve float over 7k rpm. Obviously wasn’t an issue on any of my 16g’s as it was pointless to rev that high but noticed it there. Even going back down to a 14b I’ve still opted to upgrade to Evo 8 springs and retainers as cheap reassurance. 280s of any sort on stock springs are definitely a no bueno.

I think what you need to observe here is the rest of your set up and what would be the most optimal cam selection as a 264 of any sort is a big jump from a 280 of any sort. For example, if you’re on a stock t25 even a 264 might hurt more than help over stock cams depending on other variables, if you’re on a PTE 6466 then a 264 wouldn’t be enough and you’d want to be looking at different flavor 272’s and 280’s and so on, if that makes any sense.

The more aggressive the cam duration doesn’t mean the better the cam shafts by any means. You go throwing 280’s in a 2g with a stock t25 it’s going to be horrendous to drive and a horrible powerband while making less power over what the stock cams would be capable of, to put it into perspective I’ve seen more than one situation on the dyno where various 280s have been too much cam for turbos such as the hx40 in a .70ar turbine housing or gt3582 in a .82ar housing even.

 

[FIBA M - EC17PSE]

For a few extra hundred you might as well do the springs with cams. Its just peace of mind knowing they able to handle the hot profile. You can get some BC cheap enough and even used sets for about 150ish, otherwise a 264 is ideal. 272 can be used as mentioned above but its not worth the risk without checking it all out to be sure.

 

[Dsm_canadian_mike]

I would say 264 would be best for stock springs.. valves don’t really matter

 

[Canadian_CD9A]

I would say 264 would be best for stock springs.. valves don’t really matter

Advertised duration numbers like that aren’t something to rely on - especially to figure out if you can use stock springs. A low-lift cam with a quick ramp rate can overwhelm a stock spring just as well as a huge duration cam can. For example, a Jun 264 absolutely requires aftermarket springs, and is a more radical cam than the BC or HKS 272. Bottom line - springs are $100, just do it right and change them.

 

[Dsm_canadian_mike]

Advertised duration numbers like that aren’t something to rely on - especially to figure out if you can use stock springs. A low-lift cam with a quick ramp rate can overwhelm a stock spring just as well as a huge duration cam can. For example, a Jun 264 absolutely requires aftermarket springs, and is a more radical cam than the BC or HKS 272. Bottom line - springs are $100, just do it right and change them.

He asked what is the best cam size to use on stock springs.. I personally wouldn’t run a cam on stock springs but if he was going to run a cam on a stock spring I would say go with 264… Sure used springs can be cheap but most will have to bring to a machine shop to do it so it can get expensive plus new HG , Head studs ect.

 

[1990TSIAWDTALON]

We ran 12's on stock springs and cams and a 20g with an automatic. I'm SURE others have done better.

 

[Dsm_canadian_mike]

We ran 12's on stock springs and cams and a 20g with an automatic. I'm SURE others have done better.

Ya exactly it’s been done and more will do it in the future

 

[awdmonster1904]

I would say S1 GSC cams Ive had good experience with them on my 2g with HTA 68 at 30 psi Daily driven at its time (back in the day before selling the car)

 

[Dsm_canadian_mike]

I would say S1 GSC cams Ive had good experience with them on my 2g with HTA 68 at 30 psi Daily driven at its time (back in the day before selling the car)

Ya back in the I’m sure I ran a cam on stock springs on the FP green I had so many moons ago … shit I feel old now

 

[1cleangsx]

Just adding my worthless .02 cents, back before I went speed density while still on a 2g maf I dropped in some bc272’s with my stock head/valve train FP RED set up, I wasn’t logging ANY additional airflow on those cams, I know their considered the mildest 272 out there, even my vacuum at idle was the same, and yes, I know @keltalon made some nice power on those with a 6266 but that was also on a built motor with cam gear adjustments. I’m just saying depending on your turbo/powerband the bc272’s are a mild step up from stock 6 bolt cams.