So is there sufficient strength in the OEM retainer to allow maching off .01" or so from its underside?

 

We looked at that in the beginning but there are a couple problems.

1. the cost of removing the retainer - then setup time for machining - then replacing it is really not worth it

2. the part that needs to be machined (the bottom of the retainer) also holds the keepers in by supporting them on the valvestem within the taper of the retainer. Removing material here changes the height at wich the retainer sits in relation to the valve/valve spring..... NOT good

again, if you have gone through the trouble to open the valvecover, remove the cams/rockers/valvesprings/retainers/keepers why return it to stock??

 

Stop panicking! People have run these (HKS cams) for quite some time without noticeable issues. Hell, next Saturday I'm installing a set of HKS 272's on my own personal car without a spring/retainer combo. I personally think that the worse thing that will happen is premature failure of the valve stem seals... however, that is only my opinion.

For peace of mind though, and a little more "head room" in the rev department, I'm going to install a set of the Revolver springs and retainers pretty soon. I'm working out a deal right now to get a group buy going. I'm trying to insure that it is "an offer you can't refuse" pricewise, as compared to other spring/retainer options available right now. For those interested...

 

Holy garbage.

There is not interferance issues with the HKS cams! You may (whoever post this on page 1) that there was interferance with the stock retainer on the flow bench but you would have had to open the valve a TON farther than any cam I have seen does.

No fear guys. For those of you that are worried or want to change don't mess with machining the stock retainers. Even if you do it in the car just drop in a set of better springs and titanium retainers.

I have the 272's in my RS right now, completely stock springs, retainers etc. No problems been running the car on the dyno to 7500.

David Buschur
www.buschurracing.com

 

For the record David, you have specifically since looked for the issue, and seen that there is never any contact? ...or are you just saying that you have never seen a failure, therefore there is no issue? Keeping in mind that when it comes to this drive train, I highly trust David Buschur's experience.

 

up

 

Thats why I asked him to check out the thread!!

 

I'm just thinking out loud here. If there was in fact an interference issue, wouldn't a problem be apparant right away? Every engine revolution represents a cycle. So for those cars who have had 20-25k miles on the cams would probably have over a million cycles on their retainers and valve seals. Would an engine w/ an interference problem still run after a million cycles?

 

The HKS 272's do NOT come in contact with the valve seal, I just went back and checked a head.

David Buschur
www.buschurracing.com

 

So the cams are safe per David Buschur...thats enough for me

 

Right Mark. If the cams came in contact with the valve seals they would detroy them after one or two hits. They are fairly fragile and would not withstand any contact.

I am not disagreeing with the other guys saying that on a flow bench the retainer would touch, but in order to get it to touch on the flow bench you would be lifting the valve much higher than the HKS cams do.

David Buschur
www.buschurracing.com

 

David... thanks for the info.

 

Thanks David for going "hands on"... I may still get a set of spring/retainers for the extra zing I've been running the car up to, but it is nice to know I don't have to worry about interference issues with the OE setup for now.

 

2 years hks cams, stock valvetrain countless 7500rpms trackdays .. each run lasting 15mins or around 5-6laps ..

engine inspected recently .. everything was still great .. not much wear and tear ..

 

cool, take any pics?