Milling dseries head
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Milling dseries head
I'm planning on milling my head .04 or .03 and was wondering if I would have to run it on higher octane fuel or would it be ok on regular.
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Re: Milling dseries head
I phrasef my question incorrectly. I realize im going to have to run 91 but would I have to run higher?
Just to let you know I'm pretty sure a stock crx is ok to run 87 on. Plenty of people do it without any knocking or pinging.
Just to let you know I'm pretty sure a stock crx is ok to run 87 on. Plenty of people do it without any knocking or pinging.
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Re: Milling dseries head
Someone should chime in soon about what octane to use after milling though.
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Re: Milling dseries head
On my daily I believe it was .030 off the head with .5mm overbore, I'm doing just fine on 87. If you want to be reasonably certain you'll be ok, starting filling up on 91 now before you do the work. After the fact, you should be able to retard ignition timing if you are hearing knocking. If not, you can start to add 89 in little portions to dilute the 91. If you don't hear any knocking, repeat with 87. If you do hear knocking, you know you have to stick with 91 (or 89 if you get to dilute with 87, hope that makes sense).
You can also play with a compression calculator to see what you might end up at with respect to your engine's compression ratio. Honestly with all else being equal, I don't think you'll need 91.
You can also play with a compression calculator to see what you might end up at with respect to your engine's compression ratio. Honestly with all else being equal, I don't think you'll need 91.
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