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2.4 s piston solex cam advance curve
Guys,gals,
I have a fresh engine that I am running a 123 ignition on. My rough settings are attached. Does anyone see a spot to tweak so I can really get it set up well. I have about 150 miles on it so far and it runs pretty well. A little hard starting when warm . Thoughts? 
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-12-2021, 11:06 AM
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Hi Ben, Max torque hits around mid 4k. So you can have the advance all in around 5-5.5K. I do not know your compression, so i cannot recommend how much.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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04-12-2021, 12:14 PM
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Quote:
Aaron, Its stock 2.2 S pistons with ported 2.4 heads. Nothing to special if that helps?
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-12-2021, 01:33 PM
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It does. That should be too much compression for a Solex cam. 2.2S comes in about 9.6 net with a 66 crank. Add about .5 with the increased stroke. If you have actual compression close to that, I wouldn’t run any more timing and wouldn’t want it any sooner than what you have. I would recommend you run a set of classic S cams for that compression. This would depend on how deep seats were cut for valve job and your deck height you are running. Suggested comp for Solex is 9.3 which you can probably get away with 9.5 on 93 octane
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Aaron. F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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04-12-2021, 03:00 PM
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Quote:
Aaron, Henry machined the pistons so they are not stock S compression . I believe its closer to 8.5:1 . Here are the pictures of the pistons. 
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-12-2021, 03:39 PM
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So what’s the compression?
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Aaron. F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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04-12-2021, 04:56 PM
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I believe its 8.5:1
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-12-2021, 05:12 PM
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I would experiment with 32deg to 34 deg at 5500 rpm. You may be able to push that down to 5k
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Aaron. F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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04-13-2021, 05:17 AM
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Aaron what do think of this curve?
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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04-13-2021, 02:55 PM
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Not bad. Try it out and let us know
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Aaron. F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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04-13-2021, 03:37 PM
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