OST-013: Massaging a virgin ;)
09-13-2011, 06:10 PM
Post: #41
OST-013: Massaging a virgin ;)
Project D Wrote:
Quote:Does anyone have an idea why I don't mean that?

What does a 200+hp head have that none of my heads has?

Why is the above taper not as effective in one of my heads??

(one answer covers all questions)
Basically not the same goal (?)
if it's not the right answer I hope you will enlighten us with the right one (cause I want to know Thumbs up! )

I have another question for you (or loynings)
Why many tuner do this on guide bosses?
[Image: AEU86 AE86 - OST-013: Massaging a virgin ;)]
(This one is made by Toda)

PS: If this is to much off topic tell me :wink:

...... and the answer is (drum roll)........... Oversize valves Thumbs up! I've not as of yet had a head built for O/S valves. Because the valve is oversize, the port MUST be shaped to accommodate the O/S valve. If the port were that large for a standard valve, the velocity of the intake charge will suffer, and so will the torque.

I can't speak for anyone else's work........ I try NOT to do that*. What I've found is the tools designed to get that finish, require more room, so the guide bosses are shaped to accommodate the tool.


* - I try to minimize the guide boss, but I do try to keep it in its original shape, albeit a bit more narrow, and often not as tall. If you look at my intake port compared to the untouched port, I DO change the angle that the guide boss is directed towards. OEM is just there, where as mine the base is more into the center of the air stream.

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
Find all posts by this user


Possibly Related Threads...
Thread Author Replies Views Last Post
  (Catching up) OST-086 MM: Built for Mario oldeskewltoy 2 2,286 10-28-2022 08:23 AM
Last Post: decryphe
  OST-093: My, My, Mystery oldeskewltoy 10 4,191 09-18-2022 02:19 AM
Last Post: oldeskewltoy
  (Catching up...) OST-085: 7AG Big Valve build w/Cat Cams 262 9.0mm lift cams oldeskewltoy 5 2,971 09-09-2022 09:07 PM
Last Post: Vaptor
  (Catching up...) OST-083: Salvage operation oldeskewltoy 2 1,897 07-11-2022 08:32 PM
Last Post: banpei
  (Catching up...) OST-082: Nope, never again... at least not without all the parts oldeskewltoy 0 1,506 06-28-2022 09:17 PM
Last Post: oldeskewltoy

Forum Jump:


User(s) browsing this thread: 1 Guest(s)

Contact Us | AEU86 | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication