- Joined
- May 28, 2001
on the Speedtalk engine forum, regarding turbo head design...
"Do these heads almost like you would do a set for a normally aspirated combination except,
(1) make the intake and exhaust seats .055 wide. Use 45° seat angles (wider seats will lower valve operating temp.)
(2) Intake throat at 90%
(3) Exhaust throat at 90%. Need to keep the exhaust throat this size for two reasons. The seat ring footing on the register needs to be strong and if your running a nail head Inconel (which you should) it will breath better.
(4) Do a "soft" chamber. In a turbo engine you want ZERO quench. The chamber must be total soft with no squish/quench anywhere in sight.
(5) Do not run a dish piston if you can help it. In high boost application it will pop the top of the piston right off. Putt all the volume in the chamber and piston to head clearance.
A link to the thread.. [requires registering to get into the advanced engine forum.]
http://speedtalk.com/forum/viewtopic.php?f=15&t=28450&start=15
"Do these heads almost like you would do a set for a normally aspirated combination except,
(1) make the intake and exhaust seats .055 wide. Use 45° seat angles (wider seats will lower valve operating temp.)
(2) Intake throat at 90%
(3) Exhaust throat at 90%. Need to keep the exhaust throat this size for two reasons. The seat ring footing on the register needs to be strong and if your running a nail head Inconel (which you should) it will breath better.
(4) Do a "soft" chamber. In a turbo engine you want ZERO quench. The chamber must be total soft with no squish/quench anywhere in sight.
(5) Do not run a dish piston if you can help it. In high boost application it will pop the top of the piston right off. Putt all the volume in the chamber and piston to head clearance.
A link to the thread.. [requires registering to get into the advanced engine forum.]
http://speedtalk.com/forum/viewtopic.php?f=15&t=28450&start=15