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Post by millsc on Mar 27, 2013 8:58:08 GMT -5
Putting on my new hand made big valve head today gonna post results after testing, it looks awesome  Attachments:
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Post by millsc on Mar 27, 2013 8:58:30 GMT -5
intake Attachments:
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Post by millsc on Mar 27, 2013 8:58:49 GMT -5
exhaust port Attachments:
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Post by millsc on Mar 27, 2013 8:59:12 GMT -5
combustion chamber Attachments:
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Post by andrewrides1 on Mar 28, 2013 21:08:53 GMT -5
looks awesome. i'm gonna get a big valve head too for my 50cc. do you have to measure the valve to piston gap and what do you do if its too close?
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Post by teddy554 on Mar 28, 2013 21:21:42 GMT -5
those are some good looking ports
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Post by millsc on Mar 28, 2013 23:06:21 GMT -5
The head works awesome its a powerhouse even compared to the hoca I took off.I used two base gaskets for clearance
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Post by imarider on Mar 29, 2013 0:33:02 GMT -5
Where did you get that head from?
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Post by millsc on Mar 29, 2013 0:54:36 GMT -5
You can get the head at scrappys just tell them you want bob to do it in pa., and you want it like millsc's its a beast
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Post by wilds on Mar 29, 2013 4:04:51 GMT -5
That's a good port jobb!
Two minor things doh:
At the top of the intake port, I would smoothen out the edges just before the valve guide. Just so that there is no disturbance in the airflow.
And the port is a bit too polished for my liking...
When the port is too polished the air has a tendancy to start bouncing off the walls and that causes turbulance.
You want the air to flow smoothly through the port without any turbulance. I would use a 240 sandpaper and that gives a smooth enough surface and not too polished either.
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Post by buford1488 on Mar 29, 2013 7:46:31 GMT -5
hi im the one that do's these for scrappy. beleive it or not thats not polish'ed the final paper is 220 and rubber silicon. has for the air flow between polish and not polish is about 1% faver'ing non polish. i have a flow bench and try'ed several differant thing's on these little heads and with out getting in to much detail about the flow i found out that smooth is not all-ways good. i do some thing to it to give it a tornado or hurricane affect..........hope you get what im saying........big thanks.....RCR...................dont be dead cover that head...............be safe.........
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Post by burnrubber on Mar 29, 2013 14:56:09 GMT -5
So may I ask what that head cost? I bet a couple $$$$$$$ LOL!!!Nice!!!
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Post by buford1488 on Mar 29, 2013 16:55:16 GMT -5
nope very inexpensive just go to scrappydogscooter.com..... :
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Post by imarider on Mar 29, 2013 19:35:37 GMT -5
Mill when you say it has more power is it all around power or just in the top range
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Post by millsc on Mar 29, 2013 20:39:52 GMT -5
More torque and around 500 more rpms on the top so probably gained more top end haven't gps it yet
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