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Tech & Fab
Compression versus octane?
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<blockquote data-quote="al1tonyota" data-source="post: 520599" data-attributes="member: 927"><p>From my experience my old zz383 was around 10:1 compression when I got it I ran 100av gas mixed 50/50 with 93 it ran good with no detonation but ran really rich. I blew a head gasket and gauged a head so I went threw the motor shaved the heads which were 220cc bowtie fast burn heads 69cc chambers shaved to 64cc. Decked the block to .000" flat top w/valve relief Pistons which brought my comp to 14.5:1 After that I ran 114 mixed 50/50 with 93 and it was a whole different engine!!! Still didn't detonate even with a base timing of 11*</p><p></p><p>You mentioned lead in av gas, race fuel is leaded also and will over time chalk the O2's and cause them not to read. Nothing else to worry about.</p></blockquote><p></p>
[QUOTE="al1tonyota, post: 520599, member: 927"] From my experience my old zz383 was around 10:1 compression when I got it I ran 100av gas mixed 50/50 with 93 it ran good with no detonation but ran really rich. I blew a head gasket and gauged a head so I went threw the motor shaved the heads which were 220cc bowtie fast burn heads 69cc chambers shaved to 64cc. Decked the block to .000" flat top w/valve relief Pistons which brought my comp to 14.5:1 After that I ran 114 mixed 50/50 with 93 and it was a whole different engine!!! Still didn't detonate even with a base timing of 11* You mentioned lead in av gas, race fuel is leaded also and will over time chalk the O2's and cause them not to read. Nothing else to worry about. [/QUOTE]
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