Street/Strip 124" Build
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
Steps were done by volume with water. the headers are not equal length, but tuned considering pressure losses through the bends on the rear head pipe. I do agree with the lowish flow rate on the intake, the flow was slightly compromised from the valves being sunk in the heads to accommodate the potential .276/.220 TDC lifts (might run a 1.725 on the intake).
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Cruiser
Joined: Apr 2016
Posts: 147
Likes: 34
From: Illinois
if the valves are properly unshrouded,sinking them shouldn't be a big deal.if their sunk that far what are you doing about protrusion/geometry? We do a lot of 110 castings here and don't have that problem.I'd like to see a flow chart of these heads,with only 315 cfm,where do the start flowing backwards?
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Cruiser
Joined: Apr 2016
Posts: 147
Likes: 34
From: Illinois
Anytime...👍👍
Ive only had Baisley and SA Racing touch my heads, but Wolfgang knows his stuff, for sure. You and Wolf have to be on the same page as to goals (Ex:longevity), to have a successful build at the end of the day. Remember, your numbers (whatever they end up being), with be compromised by those street goals, and a full drag strip 124 numbers will be different than yours. Just the way it is....At the end of the day, its why its so hard for example, for my Crap Cali pump gas 126 street bike to run high nines N/A-you have to thread a very fine line between street and strip. Take some away on lift, flow, velocity, intake size, compression etc.... go slower and watch the big numbers drop. Add comp, lift, fuel octane, etc...it sucks as a daily driver-but youll be a hero with your buddies- Ive been at both sides of the coin and almost Ruined a very fast street bike cause I wanted more, more, more...
So, pick your poison, and even if you do, you Still might not get what you want...but you might get what you need.
Ive only had Baisley and SA Racing touch my heads, but Wolfgang knows his stuff, for sure. You and Wolf have to be on the same page as to goals (Ex:longevity), to have a successful build at the end of the day. Remember, your numbers (whatever they end up being), with be compromised by those street goals, and a full drag strip 124 numbers will be different than yours. Just the way it is....At the end of the day, its why its so hard for example, for my Crap Cali pump gas 126 street bike to run high nines N/A-you have to thread a very fine line between street and strip. Take some away on lift, flow, velocity, intake size, compression etc.... go slower and watch the big numbers drop. Add comp, lift, fuel octane, etc...it sucks as a daily driver-but youll be a hero with your buddies- Ive been at both sides of the coin and almost Ruined a very fast street bike cause I wanted more, more, more...
So, pick your poison, and even if you do, you Still might not get what you want...but you might get what you need.
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
ok,well they dont flow 315,they flow 323.better,but still not great heads.im thinking they will be a choke point for serious HP/TQ #`s,we`ll have to wait & see.we have a 124" street strip motor being built in the shop now with 376@ 28" at .650" lift VTR hurricane heads,
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
General question here. If velocity seems to be more important than overall flow when it comes to engine power (due to cylinder fill) how does one account for maximizing velocity when porting heads?
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Cruiser
Joined: Apr 2016
Posts: 147
Likes: 34
From: Illinois
Keeping port cross sectional area down. 1cfm through a 1 inch pipe is exponentially faster than 1cfm through a 1 foot pipe. Or the garden hose analogy, putting your finger over most of the exit increases the velocity making the water shoot further, even though the same volume of water is coming out.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Keeping port cross sectional area down. 1cfm through a 1 inch pipe is exponentially faster than 1cfm through a 1 foot pipe. Or the garden hose analogy, putting your finger over most of the exit increases the velocity making the water shoot further, even though the same volume of water is coming out.
I'm sure like everything with the internal combustion engine, it's all a give and take depending on RPM.
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
You see velocity thrown out the window in favor of volume all the time. Probably the biggest example is carbs and throttle bodies. The 58mm is used/pushed far too often in conjunction with massive headwork where when the stock 50mm and some cleaning up and port matching would often yield better results. Someone here went so far as to tell me if I didnt get a 58mm TB with my 570 cams, my motor would never run right. Where this kind of stuff comes from, I have no idea. Unless your build is going north of 120hp, the stock 50mm is more than sufficient.
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Joined: Sep 2009
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From: deland,florida
as with everything,the CSA,t body size,runner size,valve size & extent of porting depend on cams & how the bike will be ridden.we`ve used big t bodies with different runner size on small motors & visa versa to deliver the power where the customer wants it