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