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scippy 08-13-2019 11:07 PM
What octane does 9:1 compression need?

JRider 08-14-2019 10:17 AM
Originally Posted by scippy (Post 4701942)
What octane does 9:1 compression need?
Why would they go 9:1 on a supercharged engine? What size pulleys are on the chargers? Also, 9:1 static compression means nothing with a blower on it, if it is 9:1 I highly doubt you are running more than 4psi boost.

SB 08-14-2019 02:19 PM
Originally Posted by scippy (Post 4701942)
What octane does 9:1 compression need?
89-91octane. You have EFI, so check knock counts when you first use 89.

Originally Posted by JRider (Post 4701979)
Why would they go 9:1 on a supercharged engine? What size pulleys are on the chargers? Also, 9:1 static compression means nothing with a blower on it, if it is 9:1 I highly doubt you are running more than 4psi boost.
Almost positive his engines are NA.

scippy 08-15-2019 11:00 AM
Originally Posted by SB (Post 4702024)
89-91octane. You have EFI, so check knock counts when you first use 89.



Almost positive his engines are NA.
Yes engines are NA .......575's efi's old skool arizona speed & marine


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