Heads
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Outstanding HDF Member
Joined: Oct 2011
Posts: 3,492
Likes: 19
From: Illinois
Heads
I have been having an ongoing back and forth discussion with a buddy of mine about heads. I have a 1550 kit in my Deluxe. I have the Screaming Eagle heads on it too. What is the differance between the SE heads and just regular heads one would use on a kit that are not SE heads? I also have the high compression pistons as well, not just the "normal" 1550 kit pistons. How do they figure into the mix of things too? I aim to hush my buddy once and for all, I hope!!
Elite HDF Member
Joined: Jun 2008
Posts: 4,109
Likes: 9
From: Connecticut
the SE heads have larger combustion chambers so you need a domed piston to get the compression right. they have larger ports and valves, how much depends on the SE you have there are many of them. It all depends on the cams, and how you ride is how well they suit you. not sure what else you are looking for. you can build a 1550 with reworked stock heads that will out perform our SE build. yeah that hurts but facts are facts
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Outstanding HDF Member
Joined: Oct 2011
Posts: 3,492
Likes: 19
From: Illinois
Nope, that don't hurt at all! It came that way!! I was also spot on in my conversation with my buddy. Now I just have to get him to understand he is wrong!!! As always, thanks!
Stellar HDF Member
Joined: Mar 2006
Posts: 2,395
Likes: 153
From: Utah
It's not a simple formula and there is no 'right way' until you run a whole bunch of expensive tests (drag strip or dyno/dyno flow). This is a big 'braggin' rights' area.
It is the right combination of the various components selected for your purpose that is the question. You may have some hot rod heads but as BlkChrome says, the cam selection is an important ingredient. If you run high compression you have to have the right fuel. All of this is hooked up to pulley ratios, stroke, friction in the engine, and tires.
Then there's always the guy at a local speed shop that says "I can make a TC88 outrun a Patrick 124". Sheesh...
There needs to be a 3D curve chart... $/torque/hp/rpm... and then the duration of the torque... but there's still the pulley/gear ratios, tires, wind, how you hold your mouth... you name it. Drag strip... or road track... and trophies won. That's all that can end an argument on this topic. You could probably build a 125cc honda that would eat a Harley's lunch on a road track, for example.
C#
It is the right combination of the various components selected for your purpose that is the question. You may have some hot rod heads but as BlkChrome says, the cam selection is an important ingredient. If you run high compression you have to have the right fuel. All of this is hooked up to pulley ratios, stroke, friction in the engine, and tires.
Then there's always the guy at a local speed shop that says "I can make a TC88 outrun a Patrick 124". Sheesh...
There needs to be a 3D curve chart... $/torque/hp/rpm... and then the duration of the torque... but there's still the pulley/gear ratios, tires, wind, how you hold your mouth... you name it. Drag strip... or road track... and trophies won. That's all that can end an argument on this topic. You could probably build a 125cc honda that would eat a Harley's lunch on a road track, for example.
C#
Last edited by cwsharp; Dec 15, 2011 at 06:50 AM.
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