Slant Six Forum
https://slantsix.org/forum/

exhaust size
https://slantsix.org/forum/viewtopic.php?t=68578		 Page 1 of 1
Author:  Dutch Dart GT 64 [ Thu Mar 26, 2026 7:34 am ]
Post subject:  exhaust size
I've read some topics but most are filled with personal preferences.

for my stock 225ci slant six from 1964, what was the original size exhaust? I cannot seem to find it anywhere so I need someone to make one for me.
i've read people install 2.25" exhaust all the way from front to bumper, but also 1 7/8"diameter?

from what https://www.slantsix.org/forum/viewtopic.php?t=56328 this is saying it should be;

from manifold 2 1/4" untill the muffler, and 2" going onwards to the rear.
I don't want extra noise, I just want it stock.

has anyone the right answer for me? thanks in advance.
Author:  Dart270 [ Thu Mar 26, 2026 7:49 am ]
Post subject:  Re: exhaust size
Original was either 1 3/4" or 1 7/8", I am pretty sure. The larger sizes give you just a few more HP, and can be made perfectly quiet with a normal (non performance) muffler. 2" is plenty for any stock engine. The smaller stock sizes were used from the factory for cost savings.

Best of luck!
Lou
Author:  hyper_pak [ Thu Mar 26, 2026 8:25 am ]
Post subject:  Re: exhaust size
Feather Dusters and Dart Lites used a 2.25 head pipe into a V8 muffler.
The muffler was 2.25 in and 2 out.
This was chosen for fuel economy.
Author:  SlantSixDan [ Thu Mar 26, 2026 12:25 pm ]
Post subject:  Re: exhaust size
Quote:
for my stock 225ci slant six from 1964, what was the original size exhaust?
48mm headpipe, 45mm tailpipe. Barely adequate; specified with priority on low build cost. For optimal driveability and fuel economy without noise, do like this, would be my reco.
Author:  volaredon [ Thu Mar 26, 2026 12:53 pm ]
Post subject:  Re: exhaust size
Arrgh gotta be metric .... And I was just saying how good it felt to be able to work on my fury and not needing a single metric tool on it this past weekend
Author:  Dart270 [ Thu Mar 26, 2026 1:49 pm ]
Post subject:  Re: exhaust size
Dan is talking to someone from The Netherlands. The entire rest of the world (95% of the earth's population) uses metric measurements. Likely easier for him to understand it and ask for parts there... 48 mm X (1/25.4 mm) = 1.88" = 1 7/8".

Thanks,
Lou
Author:  mcnoople [ Fri Mar 27, 2026 11:45 am ]
Post subject:  Re: exhaust size
I actually prefer the metric system when doing construction projects. It is so much easier to split/add numbers in MM instead of fractions. After enough years of working on metric cars it actually feels weird using SAE tools. At least I don't have any british wentworth tools or the need for them.
Author:  SlantSixDan [ Fri Mar 27, 2026 1:10 pm ]
Post subject:  Re: exhaust size
To clarify: the "recipe" I linked to is a reference for pipe sizes and muffler choices – I don't mean to suggest Dutch should install dual manifolds or anything like that.
Author:  Dutch Dart GT 64 [ Wed Apr 01, 2026 4:15 am ]
Post subject:  Re: exhaust size
Quote:
Dan is talking to someone from The Netherlands. The entire rest of the world (95% of the earth's population) uses metric measurements. Likely easier for him to understand it and ask for parts there... 48 mm X (1/25.4 mm) = 1.88" = 1 7/8".

Thanks,
Lou
I really appreciated it; I have indeed bought un-metric :roll: tools and always have to change from inches to cm...
(it gets even harder when you guyes talk about torque, pounds and quarts... Even the gallon could be UK gallon or US gallon and don't even get me on the UK weight in stones...)

But please continue in inches and feet... I will do my maths while reading along.
Author:  Dutch Dart GT 64 [ Wed Apr 01, 2026 4:16 am ]
Post subject:  Re: exhaust size
Quote:
To clarify: the "recipe" I linked to is a reference for pipe sizes and muffler choices – I don't mean to suggest Dutch should install dual manifolds or anything like that.
no I won't, thanks for your link. I will stay with the single exhaust. But that'll be at the end of summer or next winter-project.
Page 1 of 1 All times are UTC-07:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/