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VALVE COMPARISON
Type R Valve vs. GSR/B16
If you have any questions please write or call. eliasalaniz@hotmail.com or call (310) 808-9704
 
For the first quarter we will compare the intake Type R valve vs. the B16/GSR valve. B16 and GSR intake valves are the same. This data is for intended N/A engines but applies to FI engines to a certain extent. We all assume the Type R valve will flow better because its a Type R. Correct? Instead of guessing lets put both of them on the flow bench and see what happens.
 
 
If you have any questions please write or call. eliasalaniz@hotmail.com or call (310) 808-9704
 
Numbers are hard to see so I have made a chart below as well. Flow is @ 28"of H20
 
LIFT     GSR    TYPE R
.050      38.74      39.71
.100      78.69      79.67
.150    120.65    122.39
.200    156.42    157.59
.250    184.44    183.27
.300    203.36    203.36
.350    220.30    218.76
.400    234.17    234.17
.450    246.49    246.49
.500    255.74    255.74
 
 
From .050-.150 there is an increase of about 1%. At this valve lift air is moving but most of it is not being used due to the overlap period. There is a picture of an S2K head at TDC so you can get an idea of just how much both valves are open and how close they are to each other during this period. You wont get this info or pictures anywhere else.
 

The GSR valve is just about even with the Type R all the way through the flow ranges. About .5% increase at .350 valve lift. At this valve lift air is being drawn into the cylinder, which will be used for combustion purposes but not enough to see a dyno increase. The stem on a Type R is smaller but this is not where I would remove material for flow improvements. I can write another article to discuss why but I wont at this time. Thinner stems.....maybe for weight. If you want a real weight reduction a Titanium valve is hard to beat but the price will beat you up! 

Now as for weight.....There is a 5gram difference or about 41grams for the Type R. All of the Honda Challenge H1 Road Race engines I have built.....here is my recipe for reference....Take notes. 

 

  • LS block (No oil squirters)
  • GSR or LS crank
  • CTR pistons
  • ITR maniold
  • Alaniz Competition Head Work with stock size valves, head milled.004"
  • Skunk 2 stage 3
  • Type R or S2K TB stock size no over boring

This recipe makes between 212- 218 to the wheels on a 248 dynojet depending on crank and cam selection. Peak power is between 8100-8300 rpm even with Skunk2 stage 3 cams. I have never made peak power with this recipe at the 9500 rpms. So where am I headed with this.....

Save your money. A GSR/B16 valve is just as good as a Type R valve when used in this typical engine recipe. On the flow bench the Type R valve doesnt convince me. The reason being is a GSR with a few mods will out flow a Type R as we will see later on this year. 

I will also explain that the seat angles and radius's play a very important part in making a valve/seat combination work. Seatwork is much more important that the valves you choose. Stay tuned.

If you have any questions please write or call. eliasalaniz@hotmail.com or call (310) 808-9704

Joe Alaniz

Info: eliasalaniz@hotmail.com