[Roadsters] Exhaust pipe diameter

[Gary and Cindy Ault]

Early cars had the muffler located within the "X" member -- put plenty of 
heat into the floor and passenger compartment.  Later cars had the muffler 
behind the passenger compartment, just ahead of the axle.  Shop 
recommendation is fine.

The resonator cuts overall exhaust noise.  I think you'd find the car to be 
too loud without it.  I left the resonator off my '78 Civic 1200 when I 
replaced the exhaust, and it was too buzzy, so I added a resonator.  But, 
it's your choice.  Original resonators had smaller-diameter, perforated 
pipes surrounded by fiberglass -- the iconic "glass-pack".  (Original 
mufflers had just one, cone-shaped, perforated baffle in there middle, so 
the whole original exhaust was pretty open.)

I'd go with 1-3/4 inch.  It may be too tight for the frame holes (you should 
be able to check this with an inside caliper), but a length of the pipe can 
be slightly flattened on the top and bottom.   I put a '69 exhaust system on 
my '66 car when I substituted a '69 U20 for the original R16.  I had to 
flatten the pipe to keep it from rubbing on the frame.

Gary

----- Original Message ----- 
From: "JohnnyRoadster" <johnnyroadster at comcast.net>
To: <datsun-roadsters at autox.team.net>
Sent: Sunday, April 07, 2013 11:09 AM
Subject: [Roadsters] Exhaust pipe diameter


> Getting new exhaust this week.  I already replaced the manifold with a 
> header.
> So just getting new from there back.
>
> Questions,
>
> Shop is recommending moving muffler back towards the axle, instead of 
> under
> drivers seat.  Is that OK?
>
> Is a resonator actually needed?
>
> It looks like the pipe on there now is 1.5" diameter.  I asked about going 
> to
> 1 3/4", and shop said no problem.  Does 1 3/4 fit thru the frame holes 
> without
> any mods?
>
> Thanks in advance for replies.
>
> I am off to clean the oil leak residue, since the shop won't weld with the
> 'fire hazard'
>
> John
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