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Technical
Engine questions
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<blockquote data-quote="K@rlos" data-source="post: 628786" data-attributes="member: 4304"><p>That compression ratio is rather low for that cam, wants to be at about 8:1 to 8.5:1 for the cam to be the most happy. However that won’t reduce engine temps, strictly speaking a higher compression ratio will increase temps BUT if everything else is correct then 8.5:1 isn’t a concern in a bus motor. Ratio rockers increase cam lift & duration so will move the power band up the Rev range making low end driving worse. Plus you’ll need dual spring for them with that cam if you don’t have them now.</p><p></p><p>Missing a lot of info here…</p><p></p><p>What carbs do you have? What’s the jetting & vents sizes?</p><p>What’s the timing set too? </p><p>What exhaust do you have?</p></blockquote><p></p>
[QUOTE="K@rlos, post: 628786, member: 4304"] That compression ratio is rather low for that cam, wants to be at about 8:1 to 8.5:1 for the cam to be the most happy. However that won’t reduce engine temps, strictly speaking a higher compression ratio will increase temps BUT if everything else is correct then 8.5:1 isn’t a concern in a bus motor. Ratio rockers increase cam lift & duration so will move the power band up the Rev range making low end driving worse. Plus you’ll need dual spring for them with that cam if you don’t have them now. Missing a lot of info here… What carbs do you have? What’s the jetting & vents sizes? What’s the timing set too? What exhaust do you have? [/QUOTE]
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