So I decided to change out my valve seals due to occasional smoke on hot startups.

Man the eurosport tool makes it simple!! Worth every penny!

OLD SEAL



NEW SEAL


Look at how bad the old exhaust seals were!!

 

your getting valve float. the seal looks like worn out bump stop.

 

Interesting observation.

I was under the impression that the heat and stress of the spring wore through the seal.

Please explain why you believe it's valve float. I'm not dismissing your observation, I'm hoping to learn something here.

 

from factory at full lift on stock cams there is like 1.2 mm between the top of seal and bottom of retainer. ad aftermarket cams and it can be just .2mm. thats just .008 clearance. float is when cam follower is lifting off the cam lobe. the bottom of retainer hits the seal like a bump stop.

with aftermarket retainer the clearance is opened back up and the bump stop effect is lost. the stock retainers are aluminum and made pretty thick.

 

that tool is awesome..

 

Thank you for that bit of education and that makes perfect sense. Since I am still on stock springs with Kelford cams maybe I'll reduce redline to 7k.

One thing odd though is I believe my retainers are steel as I used a magnet to place them back on the valve stems.

Are you sure OEM retainers are aluminum? If so that would mean the previous owner must of swapped retainers.

 

How do you keep your valves on top position ?
Compressed air in each cylinder ?

Thanks for sharing.

 

Nope, nothing.

Just make sure the pistons are at TDC. Our tolerances are so tight, there's no chance for the valve to fall in.

 

Are you sure you aren't talking about the keepers? Just making sure.

 

One in the same I believe

 

valve locks = keepers = steel
spring retainers are aluminum.

 

Yep, that would explain it