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blue65
Samba Member
Joined: March 10, 2016
Posts: 123
Location: Melbourne Australia
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 Posted: Wed Aug 08, 2018 11:13 pm Post subject: Octane rating 1641cc engine improvements |
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My Beetle engine is 1641cc (Dual Port) is using a Engle 110 camshaft, and the
compression ratio is set 8:2:1. Vintage Speed exhaust.
If I use a 91 Octane, the engine tends to splutter when I turn off the key.
I changed to 98 Octane, the engine splutter stopped. During Summer I get pinging or gurgling in the engine when its under load.
What else can I do to improve my engine performance?
Last edited by blue65 on Sat Sep 29, 2018 7:26 am; edited 1 time in total |
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Thu Aug 09, 2018 4:35 am Post subject: Re: Octane rating 1641cc engine improvements |
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| blue65 wrote: |
My Beetle engine is 1641cc is using a Engle 110 camshaft, and the
compression ratio is set 8:2:1. Vintage Speed exhaust.
If I use a 91 Octane, the engine tends to splutter when I turn off the key.
I changed to 98 Octane, the engine splutter stopped. During Summer I get pinging or gurgling in the engine when its under load.
What else can I do to improve my engine performance? |
Pinging is destructive and must be avoided
pinging, ie detonation, can be effected by octane, use a higher octane. also spark advance, retard the timing, also temperature, make sure cooling is working perfect, head temps are important for this so monitor head temperature, cool more as needed. mixture can also play a part, as that can effect temperature for example.
Bug On!
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rcooled
Samba Member
Joined: September 20, 2008
Posts: 2506
Location: Santa Cruz, CA
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| Posted: Thu Aug 09, 2018 3:32 pm Post subject: Re: Octane rating 1641cc engine improvements |
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A C/R of 8.2:1 shouldn't require more than 91 octane fuel to run properly. Do you know if your octane rating system is the same as the (R+M)/2 method found here in the US?
As bluebus86 said, 'pinging' or 'knocking' can be caused by a number of things. Sometimes overlooked are additional factors such as altitude, or a build-up of combustion chamber deposits.
What type of carburetor(s) are you running? What size are the main and idle jets? What type of distributor do you have? What is your ignition timing set to...and do you set it static, or at full advance?
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Danwvw
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Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Thu Aug 09, 2018 5:24 pm Post subject: Re: Octane rating 1641cc engine improvements |
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8.2:1 CR Premium pump gas should handle it nicely, Mine does and it's 8.3 or more. But I did experience the spluttering etc when shutdown with regular. Bet your engine has a little more CR than you think?
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andk5591
Samba Member
Joined: August 29, 2005
Posts: 16758
Location: State College, PA
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| Posted: Sat Aug 11, 2018 7:17 am Post subject: Re: Octane rating 1641cc engine improvements |
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Supply timing, what carb and distributor and do you know what your jetting is?
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txoval
Samba Member
Joined: January 23, 2004
Posts: 3552
Location: The Woodlands, TX
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| Posted: Sat Aug 11, 2018 8:10 am Post subject: Re: Octane rating 1641cc engine improvements |
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Sounds like a timing issue to me, try retarding the timing
8.2CR is not very high |
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andk5591
Samba Member
Joined: August 29, 2005
Posts: 16758
Location: State College, PA
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| Posted: Sun Aug 12, 2018 3:50 pm Post subject: Re: Octane rating 1641cc engine improvements |
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agree that 8.2 is not excessive. But depending on which one of our cars (various engine sizes, etc) I run mid grade or premium.
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D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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