Exactly
5 Angle Valve Work
Road Master
Joined: Jul 2008
Posts: 862
Likes: 417
From: In the mountains
Its not the angles on the valve. Its the angles on the valve seat. 3 angles on the seat is more than enough unless you are going to raise the exhaust port about 3/4". Your wasting money on doing more than 3, especially for a street engine. My friend builds drag race engines.... I got his 3 angle valve seat cut on my heads...the same angle and length of angle as he does on his 800hp small block chevy engines. I'm short just a few HP though on my HD, LOL. www.hemimilitia.com
Advanced
Joined: Mar 2007
Posts: 78
Likes: 1
From: Patten,Maine
In the old days before valve guide seals and doing top end work every 10,000 miles or less it was common to multi angle the valve instead of the seats.Simply for the reason of keeping as much meat on the seats as you can. However we played alot too cutting 5 angles on the valves as well as the seats.I think alot of it was overkill if you were just building a rider instead of a racer,but it was fun none the less.Ron
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
Radiused seats are excellent for the ex. seat but the multi angle is better for the intake seat. This has been proven on the flowbench,wetflow bench, dyno and track. The hard part is determining what angles work best.That is why a good set of heads isn't cheap, you are paying for that knowledge. Chamber design, valve angle and port design all are determining factors in what works and what doesn't. Andy
Old age and skill, beats youth and enthusiasim every time.
Road Master
Joined: May 2007
Posts: 851
Likes: 5
From: Mitchellville, Ia.
Radius intake seats
Radiused seats are excellent for the ex. seat but the multi angle is better for the intake seat. This has been proven on the flowbench,wetflow bench, dyno and track. The hard part is determining what angles work best.That is why a good set of heads isn't cheap, you are paying for that knowledge. Chamber design, valve angle and port design all are determining factors in what works and what doesn't. Andy
2nd Gear
Joined: Dec 2008
Posts: 6
Likes: 0
From: massachusetts
You guys may be correct but here are the finished seats that we use every day on street builds in different stages that have set many records on the drag strip, won many dyno shoot outs, and have set Bonniville land speed records. Full radius in, radius out on both seats.
Don't get me wrong a radiused intake seat can work. I have just talked to too many head guys that really know there stuff that have tried the radius intake seat and have gone back to the angles because it makes more power. This has been on bike and auto racing applications.Just out of curiosity have you ever done any back to back testing(dyno or track mph improvements) with the only difference being a radius seat vs. a multi angle seat ? Don't take this as an attempt to insult your intelligence, I just want to know if you have done any testing that might show different results. thanks Andy
Last edited by powerhouse; Jan 27, 2009 at 06:24 PM. Reason: left out info
Road Master
Joined: May 2007
Posts: 851
Likes: 5
From: Mitchellville, Ia.
No dyno testing, just flow testing at 150"'s of depression. These are 5 axis cnc ported heads done in New Hampshire at R&R Cycle and have been tested in the lab at Dartmouth University.
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Advanced
Joined: Dec 2007
Posts: 77
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Baisley's has been in business longer than R&R CYCLES but R&R CYCLES does 5 times the amount of heads that Baisley's does in a years time...
George how or what are basing your research + facts on that Baisley has more records...
George remember our deal...