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Message: <blockquote data-quote="Izso" data-source="post: 1063748674" data-attributes="member: 2429">Well, if you look up the definition of "octane rating", it tells you how much the fuel can be compressed before it spontaneously ignites. It's not so much about the fuel itself when I was talking about it. I'm referring to all of the combination as a whole, exhaust gases, fresh air and fuel altogether. The exhaust gas will make it harder for the fuel to ignite or in this case prematurely ignite. Higher octane fuel is harder to ignite but when it does, it'll do it at much higher compression and that's what I've achieved here, harder to compress because of the extra exhaust gases but when it does, it does so at the right piston height. Problem is full engine rebuild was actually completed 2 years ago without documentation. Sigh.Nah. It's not that aggressive to warrant a valve spring change. 292 might but 260 is too mild to need a stronger spring.---------- Post added at 09:23 PM ---------- 6 hour anti-bump limit - Previous post was at 09:19 PM ----------Erm.. Ok can. But I need to figure out what adjustments give what results before I write on it.LOL.. hellokitty referring to the Pipercam Billet 260 in 288 exhaust cams la. I don't consider these as aggressive cams.I've yet to try 6 degrees as my testing is mostly based on guess work. But I'll test it based on your calculation and give feedback. As for dyno, not really. I don't have the patience to sit on a roller and to let a machine tell me what my car is capable of. The weird thing is different machines give different readings. So what I'm doing is using a Gtech Pro to measure on the road performance. It's a crude reading, but in the end it's what feels good to me that counts. Besides, I don't have a base dyno figure to compare with.Oh and adjusting ignition timing is not technically possible for the Siemens VDO 4G15. The only way I do it is by adjusting the crank sensor angle but the thing is that's pretty much guess work too and over advancing it will make my car knock pretty badly.</blockquote>

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