4 valve pent roof cylinder head for 10,500 rpm application. Full porting for scooter racing.
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- We go over what was modified and some pretty hacked up flows. I figure even without valves installed if we get flow gains they should still be fairly valid.
Duct tape had me confused, untill i realized what it was in the close up..
Nice work.
@@jamesgeorge4874 Thanks
Not to discourage your attempts, Charles, but flowing without the valve will not transfer over to the final assembly. The vacuum draw on the port without valve will migrate the vacuum reading towards the center. Especially on those short ports.
Instead of focusing on the exterior swirl, reverse that idea completely. Swirl will occur from the center out. The air speeds on the port devider will travel faster with less resistance. While the outside slows down around the radius. Use the combined valve as if they were the alternate intake and exhaust valve during overlap.
Treat them like a hemi with two sets in the same chamber.
@@approachingtarget.4503 Thanks
I did my 4 valve 1.6 Aveo head. The bowls were terrible. I blended everything with little material removal. My buddy did a perfect valve job as usual. It accelerated better than stock and still got the same MPG maybe a little better.
@@dondotterer24 Nice!
Someone on your continent should send you a Volvo 530 head for a B230 engine to develop. :)
Or bmw m52
It seems like you are on the right track for inducing swirl. It's a similar theory I had for four valves per cylinder heads.
@@charlesperkins7746 Thanks
The 4 valve stuff I work on still has 2” valves 😎
Nice!
Hay Charles. Another live would be nice. With the hot temps outside. Record one in a comfy place.
@@approachingtarget.4503 Not a bad idea. Thanks
Flow with valves in the guide backwards. Then at least you have the stem protrusion to provide some reality and seal the guides off. ❤
@@walterFletcher-tc9bm Good idea. I sealed the guides with clay. Thanks
Thanks for your tip to use WD40 on grinding stones with alloy, I rarely using stones on alloy heads anymore unless the spot really needs it, as it drove me mad they just clog so fast. Some scientist maybe knows why?
@@michaely6665 A little wd40 helps!
A+ work as usual.
@@rolandotillit2867 Thanks!
Definitely a visible difference in size ..I hate you was not ab!e to use the valves during testing ...still good work regardless .
@@clarkmcmahan1595 Thanks
🔔😎
YeeeeHaaaaw!!!!
@@hotrodray6802 Funny!
You cannot have swirl when the intake ports are symmetric about the cylinder centreline. zero or near zero. that's why diesels rotate the valves so they are not symmetric. Or the 1990 LT5 which blocked off one port at low rpm.
A small engine like that can easily be 2 valve and hit 10.5k. I don't know why they make it more complicated.
@@chrisstavro4698 I disagree. Thanks
@@servediocylinderheads How much swirl do you see with 4 valve heads?
I would like to see and hear it run and what kind of horsepower at the end of it
Is it good swiral toward to exhaust valve?
@@amirdoshmanfekan5145 I wasn't able to measure the swirl. Sorry
@@servediocylinderheads I'm not say this head i have 2 valve head it like hemi head the exhuast valve mybe 2 cm ofset from the intake valve i want the intake port toward to exhaust valve
@@amirdoshmanfekan5145 If I understand what you are writing it would probably be positive to decrease burn time.
@@servediocylinderheads i send the head picture to your email
@@amirdoshmanfekan5145 It has to. Yes
⅛" Long shank carbide burrs work great on my pencil diegrinder when I'm doing little cylinder heads.
You'd be surprised at the price for an assortment of 10 on Amazon.
@@arturozarate1752 Thanks
Thanks
@@mandapalque You are welcome.
@@servediocylinderheads zuma 125 is the model made by yamaha. Crates = engine block is separated in half in order to hold the cra camshaft together. The stock yamaha zuma 125 engines is bored out to allow the 67mm piston and cylinder to fit in.