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viperjcr
Samba Member
Joined: January 03, 2006
Posts: 64
Location: Salt Lake City, Utah
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 Posted: Sat May 25, 2024 12:14 pm Post subject: compression ratio |
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What would be a recommended compression ratio for this engine?
90.5 pistons
76 crank
Engle 100 cam
Stock valves ported
weber 40 carb |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79424
Location: Sneaking up behind you
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| Posted: Sat May 25, 2024 12:18 pm Post subject: Re: compression ratio |
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8.0 - 8.25
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7822
Location: Videbaek Denmark
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15599
Location: Deep in the 405
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| Posted: Sat May 25, 2024 1:33 pm Post subject: Re: compression ratio |
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Piston size and crank stroke does not matter.
Do you have single carb or dual carbs?
What is your elevation?
What octane gas do you want to run?
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viperjcr
Samba Member
Joined: January 03, 2006
Posts: 64
Location: Salt Lake City, Utah
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| Posted: Sat May 25, 2024 2:13 pm Post subject: Re: compression ratio |
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| single carb, elevation 4300ft, 87 or 91 octane |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7822
Location: Videbaek Denmark
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| Posted: Sun May 26, 2024 12:44 am Post subject: Re: compression ratio |
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| vwracerdave wrote: |
Piston size and crank stroke does not matter.
[/b] |
Mmmhh, actually it does. But in those bores you are correct it is minimal.
It has been a while since I was in the SLC area last, so I do not remember which octanes are available. With the W100 cam and 9-1 up there, 89 was the fuel I would use.
If the jump is from 87 to 91 you would have to go with 91.
If you want to be able to use 87 you should set the CR to 8,5
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