L28 Compression Ratios

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JonnySpeed
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L28 Compression Ratios

Post by JonnySpeed » Tue Oct 08, 2019 4:54 pm

Hi, I'm about to have a L28 rebuilt (mild cam, minor head work, 240 carbs, header - otherwise stock) and wondering what CR's people are running safely in N/A L28's that will run Okay on 95 Octane fuel. Factory is a low 8.3:1 and I'm thinking somewhere between 9:1 to 9.5:1 range is conservative?
Thanks, Brendon

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stevenewenham
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Location: Auckland

Re: L28 Compression Ratios

Post by stevenewenham » Wed Oct 09, 2019 7:45 am

Mine is around 9.25:1 but that is more conservative than most.
Most others I have talked to , with non-race cars, seem to be around the 10:1

merlin
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Location: Auckland

Re: L28 Compression Ratios

Post by merlin » Thu Oct 10, 2019 1:50 pm

I am running 10.5:1 in my L28. I have used 98 octane though so I can't vouch for 95

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Baker93
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Re: L28 Compression Ratios

Post by Baker93 » Sun Oct 13, 2019 12:59 pm

Hi.
we used to get away with 10.5 to one. 10.1 ahould be easy. Your mild cylinder head work will help with this. But the best defence / insurance is a good accurate ignition system. Knock sensors are also cheap. I utilise knock sensors.

JonnySpeed
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Re: L28 Compression Ratios

Post by JonnySpeed » Sun Oct 13, 2019 7:07 pm

Thanks guys.

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