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Thread: AKRA Ported Head

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    AKRA Ported Head

    For the 2018 racing season our rules have opened up from NKA to AKRA rules. So if you had to buy a ported head today, who would get your money?

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    Barry at Young Engines (think that is his user name here also) is getting mine. He knows what a head needs to flow.

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    Sent yours to Dover....

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    Thanks for the replies any input is appreciated.

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    Young sneaks or vause would be my top three

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    Steve Baker was putting up #'s for ported heads in another post . You might want to check him out as well .

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    Got my head from JC Specialty.

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    Rudy Wade ( Dr. Fast ) or Dyno Don
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    Don Gordner
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    Quote Originally Posted by GClary View Post
    Steve Baker was putting up #'s for ported heads in another post . You might want to check him out as well .
    Baker Racing Engines has suspended this product for the time being. There are a lot of quality shops porting these heads now, do your homework and pick one.

    Thanks
    Steve

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    ok, no problem

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    JRPW does lots of AKRA and NKA heads, lots for other builders too

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    I'm surprised we haven't seen CNC porting come into play yet! Seems conceivable to me that this would be a good process once the optimum port shape is established. It would eliminate the port shape variation in hand grinding.
    It would also seem to me that a complete induction system package that would include, head,carburetor, cam, and exhaust would be a good program for a reputable shop.

    Steve

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    4 Cycle Advanced User DynoDon's Avatar
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    I have seen a couple cnc-ported heads. The problem that's going to be created by CNC that we noticed is that the CNC process creates a dimpling at the base of the guide. Dimpling is not allowed in the port.
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    So how do you call that in tech Don? With a lot of what I have been reading lately , tech guys are really going to be on the lookout !

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    4 Cycle Advanced User DynoDon's Avatar
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    Fairly simple. If the dimpling is visible it is not allowed
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    Quote Originally Posted by DynoDon View Post
    CNC process creates a dimpling at the base of the guide. Dimpling is not allowed in the port.
    Don,

    I would think that a refined tool path surface speed and tool bit rpm this could easily be resolved!

    Steve

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    4 Cycle Advanced User DynoDon's Avatar
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    Me to. But, they they aren't Taking the time to do it they're just sending them out the door. If we don't pay attention to it and start dq'ing them when they're discovered then it's going to flood the market and will end up having to make them legal because tech eyes didn't find it.
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    Quote Originally Posted by DynoDon View Post
    If the dimpling is visible it is not allowed
    Has anyone validated it to be a performance gain in a Clone engine?

    Steve

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    Good seeing you on here . Have a good day

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    4 Cycle Advanced User DynoDon's Avatar
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    no need to validate when the rule book specifically says it in print.
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    Ive never been in favor of rules that were visual interpretation ! Seems to me that there could be vast levels of dimpling and could be difficult for all the tech men to be consistent on this call...........no sure?
    Would surface waves, ripples and ridges be considered legal?

    If I remember correctly it was port visual reasons that AKRA decided to allow porting of the head.

    Steve
    Last edited by steve baker; 04-16-2018 at 10:02 AM.

  22. #22
    4 Cycle Advanced User DynoDon's Avatar
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    It was visual interpretation of the Short side radius and the right and left side edges of the runner where it meets the bowl and the depth of the bowl that forced the change. That was what was difficult for field tech to prove. If a tech can't visually see a dimple, riflings or circular / line grooving they shouldn't be teching.
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    So it is possible that a DIY guy with an unsteady hand and dull rotary burr could get DQ'd if he leaves traces of dimples, riflings or circular / line grooving in the ports?

    Steve

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    if we are allowing porting, why is a dimple or dimpling illegal? your allowing us to PORT the heads. A dimple was not illegal in the flatheads once porting was allowed. Stupid is as Stupid does

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    4 Cycle Advanced User DynoDon's Avatar
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    As long as the rule is in writing it has to be enforced. I did not write the rule. If you wish to see the rule changed feel free to call the Akra office and let them know.
    AKRA Northeast National Tech Instructor
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    I actually could care less and dont have a dog in the fight. its just the non sense like this rule driving the sport down fast. I didnt mean for that to come across ill natured to anyone. Just stating my opinion.

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    There is a big difference between an errant dimple, scratch or ridge compared to a dimpled port, a carefully designed series or pattern of marks. With research and testing a skilled operator could change the flow of a port with very subtle machine marks.

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    Quote Originally Posted by Kart43 View Post
    With research and testing a skilled operator could change the flow of a port with very subtle machine marks.
    Yes and linear grooves have also been used in performance cylinder heads.
    I am really wondering if the best tech plan would be no tech in the port shape and configuration.........IDK ?

    Steve

  29. #29
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    The more time spent on making a head better by allowing dimples linear grooves, circular grooves the more the head is going to cost. Yes or no?
    AKRA Northeast National Tech Instructor
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    Quote Originally Posted by DynoDon View Post
    The more time spent on making a head better by allowing dimples linear grooves, circular grooves the more the head is going to cost. Yes or no?
    CNC ported No, hand porting maybe, probably not. There's only 2 ports!

    The current price for a top Clone is about where we ended up with the Flat Head and BP Animal engines some years ago. As much as its discussed and considered very important to keep the price down look where we are for the Clone today! The technical knowledge and desire to write an engine tech manual for a low cost racing engine is not really being deployed these days. Also at the end of the day its still going to be largely controlled by supply and demand, what the market will bare and the engine builders and part suppliers cartel!

    Heck even the Briggs LO206 package price is pushing 1000.00 now!


    Steve
    Last edited by steve baker; 04-17-2018 at 08:13 AM.

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