valve float control
- Thread starter curtracer
- Start date
Not sure quite what you are asking, but if you are asking whether or not valve float can be stopped by
the choice of valve springs the answer is YES. In fact valve springs are the only way to control valve float.
CarlsonMotorsports
Site Supporter
Controlled valve float in WKA stock flatheads is commonplace. You can determine the rpm that you float the valves by adding upper shims (stock Briggs .023" and .053" in WKA or aftermarket in IKF) and by using different length springs (ie 1.360", 1.420", 1.460", and 1.485.") Determining the "proper" amount of float is best discovered no the dyno under constant load in my opinion. It's difficult to see higher rpm valve float on an acceleration dyno with quick accel runs. I'm sure it can be done though -- repetitive results have got to be a nightmare though when you're looking at such a short period of time.
If you do not have access to a dyno, you can experiment on the track. You can see/hear/feel valve float just before peak rpm - generally on a flathead you get into serious float around 6300 rpm. From there on up it'll "rattle around." Dyno Cams put out a short little video 10 years ago or more talking about controlled valve float and it showed what's going on inside of these engines from an idle on up to peak rpm. Very interesting if you can find a copy of it still -- it'll give you a much better understanding of why and where you want valve float on these engines.
--
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cuts
www.CarlsonMotorsports.com
Celebrating 25 years of service to the karting industry
765-339-4407
bcarlson@CarlsonMotorsports.com
If you do not have access to a dyno, you can experiment on the track. You can see/hear/feel valve float just before peak rpm - generally on a flathead you get into serious float around 6300 rpm. From there on up it'll "rattle around." Dyno Cams put out a short little video 10 years ago or more talking about controlled valve float and it showed what's going on inside of these engines from an idle on up to peak rpm. Very interesting if you can find a copy of it still -- it'll give you a much better understanding of why and where you want valve float on these engines.
--
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cuts
www.CarlsonMotorsports.com
Celebrating 25 years of service to the karting industry
765-339-4407
bcarlson@CarlsonMotorsports.com