My
understanding is that one advantage to using individual throttles as you did
was that it mitigated the effect of pulses between the intakes and tuning
became less critical.
Where
did you get the tubes to weld-up? I’m planning on making a casting
myself but it would nice to know alternate sources.
Bill;
I don’t recall where I got the
tube – there are a number of vendors. I think I bought U-bends
which were then cut and welded. The tube size was chosen to have a circumference
close to match that of the ports. The fabricator then made mandrels to
shape the tubes to match the ports – then welded into the water-jet cut
flange.
Al
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Thursday, April
01, 2010 5:06 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Tuned lengths
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Tuned
lengths
Please
post drawings/photos/specs...Yvon
Some
photos of the intake manifold for the 20B are attached. It is 4.5” from
flange to flange; the TB flange is at a slight angle to fit my installation;
the TB is TWM 3003; 44mm diameter bores.
Another
builder built his from my drawings and had a couple extra made. At least
one is still available. The price is around $1000; I’ll have to check.
That’s a real deal – by the time I had mine fabricated and heat
treated it was over $2000. Let me know if anyone is interested.
Al