any hamilton 12v head dyno results out there?

kawi600

kawi600

got Coal for Christmas
just curious if anyone has dyno'd a 12v with the new hamilton head. Especially what the porting and larger valves may or may not do to the power curve.
I had mine tweaked a little with some swirl reliefs on the intake valves and decked the heads to lower the valves in the cylinder a bit more.
Im doing a before and after compression test and hopefully a dyno soon to post results.
 
im assuming it just doesnt make power since no one has results after all these months. its a shame i have no one to test it so i can post the results on here for everyone to see. its setting here on the floor waiting for a decent motor to put it on for the dyno
 
i wish i could tell you any differnence but only my cam profile stayed the same.
i also decked the head .060 and back cut the valves with a 37.5* valve job..
 
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I can see how results will be really dependent on the cam profile. I think he tested with his 188/220 cam? Ive got the 181/210.
Zach posted some results but it looked like something else changed at the same time (?) I dont think it was strictly a before and after to get a good comparison.
The concerns I had were about port velocity and swirl and how they affect stuff racers usually dont care about, low rpm power and economy.
I think this head might be perfect for someone with a DD truck and a procharger or supercharger over a turbo. Thats the direction Im going in with this project.
Even if it winds up that the head has no advantage over a ported one with larger valves I think the money is still pretty close when you consider the cost of an intake runner and everything else that goes into the head.
 
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DEZLFREK said:
i wish i could tell you any differnence but only my cam profile stayed the same.
i also decked the head .060 and back cut the valves with a 37.5* valve job..
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I think that's the problem right there. Everyone I've seen that has these heads is also redoing their entire setup so no one has any good back to back comparisons.
 
What he said^^ a lot of people went all out with new builds. I can't name one person that just put the head on
 
The only changes Im making are in the head. Too bad I didnt dyno it before. =(
I have a feeling results are only going to be better when boost is involved.
Also not sure how much compression is lost in the valve reliefs. Tiny amounts of change in squish seem to do a lot to economy.
 
I changed converter, injectors, exhaust manifold, cam, and put blankets on along with the head. I love how I can get my lit by 2100 rpm and once everything is figured out it will be on the dyno. Doubt all you want but this thing is making power on my truck at least. I work to much which is the only reason I havnt finished this thing yet.
 
lenahan05 said:
im assuming it just doesnt make power since no one has results after all these months. its a shame i have no one to test it so i can post the results on here for everyone to see. its setting here on the floor waiting for a decent motor to put it on for the dyno
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I've got b decent motor you can put it on! Come on down tonight we'll try it out tomorrow :lolly:
 
i built a new motor, but everything went back the same, didnt really see an increase in hp. less boost, and a little better spool up, but i really only got it for the beefyness. didnt want to crack another stock one.
 
SCHOOL BUS said:
i built a new motor, but everything went back the same, didnt really see an increase in hp. less boost, and a little better spool up, but i really only got it for the beefyness. didnt want to crack another stock one.
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Any issues with the head being a little soft ( Rockwell wise)?
 
Give me a few weeks. We ran the head one pass and had to pull it (bent some valves) and put the stock one back on. Stock head vs. hammy with some exhaust porting, same dyno we've been using. It will be interesting for sure.
 
valve float? I had Zach lower the valves into the bowl a little. Its got me a little nervous about bending a valve if I add an exhaust brake or raise the max RPM.
 
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