While I can't add to the discussion on the tube diameters, I have a
question. Does anyone have the exhaust tip from a late roadster laying
around that they could measure? What I want to know is the length of the
"bugle", the diameter at the resonator and the diameter at the end of the
tip.
Thanks!
Sid
>From: "Kyle Hagemann" <kwhcpa@addler.net>
>Reply-To: "Kyle Hagemann" <kwhcpa@addler.net>
>To: <HIGHKIX4@aol.com>
>CC: "311" <datsun-roadsters@autox.team.net>
>Subject: Re: 2.5" flowmaster on U20?
>Date: Wed, 27 Sep 2000 09:33:12 -0700
>
>----- Original Message -----
>From: <HIGHKIX4@aol.com>
>To: <kwhcpa@addler.net>
>Sent: Wednesday, September 27, 2000 9:20 AM
>Subject: Re: 2.5" flowmaster on U20?
>
> > A 2.5 flowmaster will be real loud on a roadster, and you will have to
> > spend some money on reducers and stuff, as 2 inch is as big as will go
>through
> > the frame. I got a 2 inch system with 2 glasspacks, good ones that are
>2 inch
> > all the way though, and sounds about right, not quite "cop loud".
> > Whole system was $103, but I also added CDM stainless steel braided flex
>$40
> > btwn manifold and pipe. This saves the manifold or header and keeps
>exhaust
>from
> > rattling.
> > Best Regards,
> > Jim
> > Chesapeake Va
> > 67 pushrod 2L
> > 72 510 wagon
>
>
>Thanks Jim, I was wondering about the wisdom of a muffler that
>big;
>
>As an aside, would it be worth the effort to go 2.25"? If the
>exhaust shop was to bend the tubing in such a way as to
>squeeze thru the frame? Or is 2" big enough?
>
>Here's why I ask - from my short stint on the 510 list, I gathered
>that 2.25" was good for a fairly hot L4; a good barometer of L4
>hotness <G> was the carbs - 38mm SUs, DGV, or stock should get 2"
>pipe; another useful indicator was displacement - 2L+ or under 2L.
>
>So here we have a 2L four cylinder, with 46mm carbs, big ports,
>etc. Sounds like if it were a L-series in a 510 or whatever, 2.25"
>would be the way to go.
>
>But I know that bigger isn't always better, and don't want to overkill.
>
>Thoughts?
>
>Kyle
>'69 2000/U20 (2")
>'71 PL521/LZ22 (2")
>'72 240Z/L28 (2.5")
>
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