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d12-Matt
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 Posted: Fri Feb 01, 2002 5:33 pm Post subject: |
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| What type of fuel do you guys use in your 924's? I heard that too low of octane can cause detonation in high compression engines. Last time I did a compression test all the cylinders showed around 140-150 PSI. Does that mean I need to use 91 octane fuel? Also, how would I be able to tell if detonation was occuring? |
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Sat Feb 02, 2002 3:54 am Post subject: |
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Regular 87 octane should be fine, unless you've tweaked the engine at all... I run 89 octane in the racecar, with more advanced ignition timing.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Roger Hall
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| Posted: Sat Feb 02, 2002 10:21 am Post subject: |
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| maybe i like wasting money but the sticker says 91 octane so i use the 93 octane. |
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Sat Feb 02, 2002 10:49 pm Post subject: |
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Yeah, seems like you do - those ratings are to old standards, RON rating as I recall... labels at the pump are an average of RON and MON (R+M/2), and therefore lower for a given blend.
Save your money.
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Roger Hall
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| Posted: Tue Feb 05, 2002 2:19 pm Post subject: |
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| thanks i will |
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numbers
Guest
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| Posted: Wed Feb 06, 2002 7:51 am Post subject: |
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| 85 octane is probably adequate for an NA, but for you Turbo owners, be sure you use the highest octane rated fuel available in you area. |
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924 FAQ (Technical)
