#41
|
||||
|
||||
![]()
There is a HUGE volume of Dremel (and other brand) accessories on the market to do this with, everything from mini grinding stones in cylindrical, conical, and spherical shapes, to 1/4" and 1/2" diameter sanding drums in varying grits, and burrs, too. You should have no problem whatsoever, finding this stuff.
__________________
Treat it as you would an aircraft frame and you should have no problems. -Name Withheld The Manual- "Just the manufacturer's opinion of how to put this together."- Tim "The Tool Man" Taylor Put down the wrench, and come out with your hands up!- Me! Wrench, Wheel, Wreck, Repeat... |
#42
|
||||
|
||||
![]()
And WEAR EYE PROTECTION!!!
when I was diy-porting my Buick 455 heads, I thought my eyeglasses would be ok, and then I got to go visit the nice optometrist and have him remove the rusting bit of iron from my eye. NOT fun.
__________________
TexasTerror: http://www.diygokarts.com/vb/showthread.php?t=14872 Yerf-Dog: http://www.diygokarts.com/vb/showthread.php?t=19878 |
#43
|
|||
|
|||
![]() Quote:
mike |
#44
|
|||
|
|||
![]()
heres a good example of what my all out high rpm race port looks like on a gm ld9 exhaust port compared to stock, big in all directions but down..... for big power in the higher rpms....
mike |
#45
|
|||
|
|||
![]()
simply awesome!
__________________
because lighter,
is faster. |
#46
|
||||
|
||||
![]() Quote:
![]() ![]() ![]() ![]() |
#47
|
|||
|
|||
![]()
that was actually just a test port that i had flow benched compared to stock... at .500" lift and 28" of water the stock port flowed 148cfm and the new port flowed 201cfm.
mike |
#48
|
|||
|
|||
![]()
just interested if after porting all of the valve components as well as the fly wheel need to be upgraded or is this just helping it breath?
looks good ![]() ![]() |
#49
|
|||
|
|||
![]() Quote:
it helps it breath better. u can gain pretty decent amounts with just head work but when u upgrade the whole breathing system from in to out u (filter, carb, head cam, possibly valves and exhaust) u really see gains. but along with all that top end stuff, ur gonna want to rev higher to get the most out of it and thats where the a built and balanced bottom end comes in so it doesnt grenade on u after a couple high rpm pulls. enter piston (higher comp) rod, crank and flywheel and any other mod that these single thumpers need. mike |
#50
|
|||
|
|||
![]() Quote:
|
#51
|
|||
|
|||
![]()
I blended the throats to seats but did not do any material removal to the bowls only cartridge rolled them. until I can get a spare head to cut up I'm not going to do anything extreme. I could always get the welder out and raise the floors a bit so it's not a straight shot and then a 90 degree turn into the cylinders but that will cost some $$$ For the person that wants that..... believe me I've thought about it. I've done to some ford cobra jet heads..... What a pita that was.
|
#52
|
||||
|
||||
![]()
You use some terms that i don't follow clearly. Would you explain a few for us un-informed folks. When you say floor, throat , seat , bowl which areas does that refer to? I'm very interested in learing some basic machining for building my on small engines. I find them all the time that people throw away because they dont know any better so extra heads to practice on are not a problem . You also mentioned cutting a head up. Do you do this to allow you to examine which areas would be best to work? What are basic areas to look at?
__________________
Answers are useless without the question. |
#53
|
||||
|
||||
![]()
Here you go, good explanation of terms and procedures
http://en.wikipedia.org/wiki/Cylinder_head_porting
__________________
TexasTerror: http://www.diygokarts.com/vb/showthread.php?t=14872 Yerf-Dog: http://www.diygokarts.com/vb/showthread.php?t=19878 |
#54
|
|||
|
|||
![]()
yeah that link pretty much sums it up.
mike |
#55
|
|||
|
|||
![]()
Hey, awesome thread. Thank you!
I've been working on and researching cars for about 13 years now, so I follow almost everything that you're talking about except when you talk about the areas like floors, throats, seats, and bowls. So I learned something new tonight. I wanted to make a comment about this subject. In order to achieve proper flow throughout all cylinders, each cylinder should be the same mass (E.g. Mike said the original ports flowed at 148 c.f.m. (cubic feet per minute), and after the porting was finished, the port flowed at 201 c.f.m. Well, all ports should be close, if not match, the 201 c.f.m. Which it looks like the OP did. Cylinder #1 should = 201 c.f.m. or very close to it Cylinder #2 should = 201 c.f.m. or very close to it Cylinder #3 should = 201 c.f.m. or very close to it, and Cylinder #4 should = 201 c.f.m. or very close to it Mass production cylinder heads from the factories that create them aren't matched most of the time, they have discrepancies, but they also have tolerances. As long as the head is within the manufacturers' tolerances, they send it out to be built and placed on a vehicle that will be sent to the customer. My second comment is that when porting an aluminum head with a porting bit; the bit should ONLY be used for aluminum. So if someone used a porting bit on a metal head, they shouldn't use it on an aluminum head. There should be 1 specific bit for each metal; in order to prevent contamination of the metals. Again, awesome write-up, you seem to know exactly what you're talking about on this subject. Last edited by k-man1081; 02-17-2014 at 10:01 PM. Reason: grammatical error |
#56
|
||||
|
||||
![]() Quote:
But just to add to this. Polishing the exhaust port to a "mirror" finish also helps on cooling. A flat surface has less surface area then one that is rough. So less material is in contact with the hot exhaust gasses to soak up the heat. While the "mirror" finish also reflects some of the heat ![]() Quote:
![]() You can clean up your intake port to smoothen it up a bit, while still leaving a bit of texture. Some of the same as with the exhaust port applies here (just the other way around). By having less texture there are less time for the intake charge to pick up heat while entering the cylinder. But balancing this might not be so easy... ![]() |
#57
|
|||
|
|||
![]()
Cool, use the tools to knock of the excess and finish it with a finger wrapped in Emery Cloth. I love seeing a great port job.
|
#58
|
|||
|
|||
![]() |
#59
|
|||
|
|||
![]() |
#60
|
||||
|
||||
![]()
That looks pretty good, nice job
![]()
__________________
2013 Build-off Winner - http://www.diygokarts.com/vb/showthread.php?t=21076 |
![]() |
Thread Tools | |
Display Modes | |
|
|