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Title: 2276 Build Exhaust size choice Post by: Jimbosmith on May 08, 2020, 20:25:15 pm Hi everyone,
Trying to workout a exhaust size for my 2276 All internals balanced and CR is 9.6:1 FK8 cam with 1.4 rockers 48IDF carbs with port matched maniflolds Scat Super D 42x37mm Heads 82mm counterweight cam lightweight flywheel No idea on BHP, yet as its still on a pallet. My choices are between 1 5/8 and 1 3/4 Weekend Driven, but i do intend to hit the dragstrip with it, on occasions. Transmission and axles are built strong enough for strip use. Title: Re: 2276 Build Exhaust size choice Post by: BugBusBuggy on May 10, 2020, 10:36:46 am Hi Jimbo,
My engine spec is in the 'In da Works' section (68 Chinchilla beetle), I went 1 5/8 after a lot of research. I'm finishing off the installation this weekend. Again, street and strip. Broadly speaking the larger bore will move your power band further up the rev range so might be less good on the street. If I remember, John Maher has a 190 bhp motor with a 1 5/8 (42mm) on his website. All that said, I've not had mine dyno yet and I'm not an engine builder, but I read a LOT of articles, threads on various forums, and countless websites.... Hope this helps a bit! Dave. Title: Re: 2276 Build Exhaust size choice Post by: BugBusBuggy on May 10, 2020, 11:18:42 am I started off with this, basically where your power is made and took as a guide rather than an absolute...
[attachment=1] Title: Re: 2276 Build Exhaust size choice Post by: Jimbosmith on May 12, 2020, 19:46:54 pm Thanks had seen that chart before. Will have a look at your built spec now
Title: Re: 2276 Build Exhaust size choice Post by: UltraOrange67-2443 on May 12, 2020, 22:45:51 pm I have a 2276 with a 1 5/8" header
Title: Re: 2276 Build Exhaust size choice Post by: j-dub on May 13, 2020, 02:00:11 am I also have a 2276 with 1 5/8 header, I built it as a street engine. Sounds like your engine above will be similar Jim so 1 5/8 would likely work well.
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