I did test the Revolver springs and the specs they are advertising, found here in this topic somewhere are exactly what I found when testing them. BTW, through all the testing I have done here on the RS and such Revolver is the only company that had the ***** to actually send their product here and have it tested. NOT a single FMIC, exhaust, header, 02 housing or anything else for that matter was sent. Shows some guys are willing to put their parts on the line and others just want to talk about how good they are.

If you are worried about the clearance problems with the retainer to the seal then I recommend changing the factory spring and retainer out. I don't see any problem using the Revolver kit as it will take care of that problem for sure. We have a kit also and we can sell the Revolvers too for those of you that do business with us and want to use theirs.

Also, the clearance issues don't vary from exhaust valve to intake valve, Revolver and myself are measuring maximum lift numbers so the exhaust lift isn't even used.

David Buschur
www.buschurracing.com

 

Got Doc appointments and the such the next two days... I hope your still working on it Weds when I'm free... as for the springs/retainers... well I'm running them for a reason

 

I measured the seal/guide height and it is 24.67mm
Therefore subtract the guide installed height of 19.5 mm and you get 5.18 mm.
This means that 5.18 mm of seal is above the end of the guide.
This means that I am coming up with the same numbers as Revolver.

I am using a digital verneer caliper that I know is not dead accurate but my numbers are almost identical to Revolver's. Thus, the stock springs do not have sufficient clearance, particularly on the 10.8 cam. The 10.2 lift cam is very very close.

David,
I was saying tha the valve stem protrusion in the service manual is differnet as well as the valve lengths. Therefore if you were measuring one valve and Revolver was measuring another then you would get different numbers. Although not the big difference you were seeing.
Edit: I re-read your post and get what you were saying about max lift.

Revolver,
I am going to go back and look at your posted specs on the valves for installed height. The service manual says it is different on the intake and exhaust. Are the spring seats making up the difference so all the valves are the same? Or do the heights need to be shimmed to adjust seat pressure?

On another note, the service manual has the valve diameter as 6.0 mm which freaked me out since the Ferrea valves I have are 6.55 and 6.57. They are also (Ferrea) the same length and stock is different by .02 mm which is only .008 so that can be fixed easily.

 

Oh, one other thing.
Revolver and Bushur deserve a lot of credit for this thread and their honesty.
Some vendors just tell you the part is good, others tell you why and are willing to discuss it.

 

Absolutely... these two vendors have gone the extra mile... proved that a company does not have to be "super secret" about products in oder to "secure their buck". I truly hope people continue to patron these two companies based if nothing else, on their open honesty.

 

Any more updates from Buschur or Revolver? Also how about some updates from those of you running HKS cams on the stock valvetrain- any oil consumption issues or other problems?

 

If you read above, when I took my head off and performed all the measurements (roughly with a verneer caliper) and I fully agree with Revolvers findings. Intake side absolutely must be hitting. Eshaust is most likely touching too.

 

We have the Revolver springs/retainers here in stock now for those of you looking for them.

We also have a springs/retainers here, two different applications in reality, be sure to give us details of what you are doing with your car, boost, rpm etc when ordering so we can fit you with what you need.

We have taken a few cars apart now with a bunch of miles on them with the HKS cams in them with stock springs/retainers. No oil consumption in any of them, no damage to the seal. Things seem to be fine.

David Buschur
www.buschurracing.com

 

So what are the differences in the 1g springs and retainers you sell for the Evolution and the Revolver kit?

 

Retainers are different, springs are different, completely different kits.

David Buschur
www.buschurracing.com

 

Thanks for clearing that up.

 

...clear as mud...


I knew David would have to carry these

 

Yay.. this thread had a happy ending

 

Thanks to the professionalism of the Buscher Crew, Zeus, Timzcat and all others that posted useful information I think this will go down in evom.net history as the longest running "on-topic" post ever!!

 

So then it safe to run HKS cams without upgrading the springs/retainers?