Paul I agree. I just dynoed a street port 86-88 six port. What a
disapointment. I used turbo rotor housings. I street ported the exhaust which
wasn't much and enlarged the center housing, nothing with the end ports( with
the sleves removed ). Went from 180 to 200. From 6700 rpm to 7700rpm and
141ft/lbs to 148ft/lbs. Put on the 89 intake and went to 210hp and 152
ft/lbs. I had 175 hp@ 6,000. hell a stock 4-port does that without doing
anything. As I speak their is a company in your area that has made a six-port
into a four port. A big four port with not great results. Anyhow I'm done
with those. Next on the dyno is a Cosmo 13B , ported with ceramic seals. Have
you seen these engines? It has 20B housings and porting stock, wich is much
larger than 3rd gen engines. Skip

Agree with what Skip? Come on Skip learn to use "Forward Quoted".
Help me out here folks. How does Microshit Internet Exploader do
forward quotes. I know it can do it.

You gots to streamline those secondary ports with JB Weld when you remove the
sleeves or the partition between the primary and the secondary.

If you are throwing good (not worn) six port end housings away let me know
and you can ship me a pallet full by truck :-)

Paul Lamar

What are the intake manifold and exhaust pipe details of those engines
Skip? Carb or fuel injection?
Paul Lamar

See if this works. I was talking about your statement about the six port pri&
sec. divider. All engines are fuel injected. The turbo engines are twin turbo
and single turbo. The n/t engines are fuel injected six port of the 85 SE
style with the three mm. apex seals. Skip

Much better see my previous message to you. Now put your responses at the end
instead of on top.

What I am interested in is what type intake manifolds are you using on the dyno?
If just the stock manifolds they are tuned for lower RPM's.
Also what is the length and diameter of the exhaust pipes you are using on
the dyno? Are you using a muffler on the dyno? If so it would be nice if
you could measure the back pressure on the muffler.

What we would mainly like to know is what is the HP at 6000 to 6500 RPM.
Torque down low is of little use in an aircraft engine.

Paul Lamar
 
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