cylinder head question

glorkar · Aug 23, 2006

What exactly is the difference between the 2.3 turbo head and the 2.3 n/a head?

white1989 · Aug 24, 2006

Hardened Valves, chamber is different. Oil feed line.

Red_LX · Aug 24, 2006

Actually the oil feed line comes off a distribution block that threads into the 1/4" NPT hole at the back of the head...and this hole is on both heads, so that isn't really a difference.

To explain it a little more...n/a heads have a "closed" chamber (heart shaped) where the turbo heads have an "open" chamber (D-shaped). The turbo heads also have hardened valve seats on the exhaust side, and the valves are better. Other than that they're basically identical.

glorkar · Aug 24, 2006

Thanks for the info.

SMOKEDYA · Aug 25, 2006

So do the turbo heads give you any power advantages over a n/a head? peace

john

Brantley · Aug 25, 2006

A turbo head will give you power only on a turbo engine (well, in most cases). With lower compression on the turbo 2.3, you can crank the boost into the 20ish+ range. Turbo with a N/A head, 10-12psi is about all you're going to get.

To see the differences in the chamber design, check out http://www.binaryweb.com/fordtech/cyl_head_bowl/index.asp

SMOKEDYA · Aug 25, 2006

Brantley said:
A turbo head will give you power only on a turbo engine (well, in most cases). With lower compression on the turbo 2.3, you can crank the boost into the 20ish+ range. Turbo with a N/A head, 10-12psi is about all you're going to get.

To see the differences in the chamber design, check out http://www.binaryweb.com/fordtech/cyl_head_bowl/index.asp

cool thnks man! where abouts in memphis are you? I used to live in bartlet. peace

john

glorkar · Aug 26, 2006

Isn't 12lbs the stock boost on a turbo?

Pro-Hawk · Aug 26, 2006

glorkar said:
Isn't 12lbs the stock boost on a turbo?

The SVO's came stock at 15psi... I forget when the T3 runs out but I want to say around the 20-22psi range.

bhuff30 · Aug 26, 2006

pffft. Anyone ever calculated the actual difference in compression between the NA heads and the turbo heads?
The difference is minimal, and on a 9.0:1 NA engine, the turbo head will drop you to around 8.7:1. The turbo head flows a bit better, so you can expect a bit more top end (only sightly less pathetic) and possibly a little less torque everywhere else.

On the other hand, an NA head on a turbo engine will get you from 8.0:1 to 8.3:1. That alone won't make the difference between running 20psi and 12 psi. Simply not true. Heck, I milled my NA head, and was running probably 9.5:1 compression and still getting away with 12-14 psi of boost. lol.

Most of the difference in compression is from the dished pistons of the turbo engine.

cylinder head question

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