flyrotary@lancaironline.net Mailing List Archive

Bill,

I forgot that casting was a hobby of yours. I'd like to redo my intake manifold and would be interested in a casting for the lower (first 90 degree turn) part of the manifold where the ports transition from round to oval. I'm currently using a highly modified (lots of welding, grinding, and JB Weld) RX-7 lower. Lets talk.

Mike Wills

From: Bill Monroe

Sent: Friday, April 02, 2010 9:13 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Tuned lengths

Al, regardless of how it works, it’s beautiful.

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.

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