The Cal-look Lounge
Welcome, Guest. Please login or register.
Did you miss your activation email?
March 29, 2024, 08:08:42 am

Login with username, password and session length
Thank you for your support!
Search:     Advanced search
350646 Posts in 28563 Topics by 6811 Members
Latest Member: Bren
* Home This Year's European Top 20 lists All Time European Top 20 lists Search Login Register
+  The Cal-look Lounge
|-+  Cal-look/High Performance
| |-+  Technical stuff
| | |-+  2276 Build Exhaust size choice
« previous next »
Pages: [1] Print
Author Topic: 2276 Build Exhaust size choice  (Read 4474 times)
Jimbosmith
Newbie
*
Posts: 44


« 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.
Logged
BugBusBuggy
Newbie
*
Posts: 44


« Reply #1 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.
Logged

If it breaks (and it probably will).... it's time for an upgrade...
BugBusBuggy
Newbie
*
Posts: 44


« Reply #2 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: You are not allowed to view attachments ]
« Last Edit: May 10, 2020, 11:23:45 am by BugBusBuggy » Logged

If it breaks (and it probably will).... it's time for an upgrade...
Jimbosmith
Newbie
*
Posts: 44


« Reply #3 on: May 12, 2020, 19:46:54 pm »

Thanks had seen that chart before. Will have a look at your built spec now
Logged
UltraOrange67-2443
Hero Member
*****
Posts: 1034



« Reply #4 on: May 12, 2020, 22:45:51 pm »

I have a 2276 with a 1 5/8" header
Logged

1967 1200 2920cc EFI
j-dub
Full Member
***
Posts: 146



« Reply #5 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.
Logged
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!