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Brett

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9502 Posts
Member #: 1023
Post Whore

Doncaster, South Yorkshire

26th Apr, 2013 at 12:48:39am

i have never been able to understand this, but i think i have cracked it

right inlet cam 240 duration and a centreline angle of 120 timed in at 120 degrees

exhaust cam 240 duration, centreline of 120 and timed in at 117 degrees

exhaust cam timed it at 117 deg btdc
inlet cam timed in at 120deg atdc

by my calcs the exhaust cam closes 3deg after tdc and the inlet opens at 0tdc
3deg overlap ?
am i correct so far?

right now if i advance the inlet cam 20deg the valves open 20deg sooner ie 20deg btdc ( and 23 deg overlap)

and if i advance the exhaust cam 20 deg the valves close 20 deg earlier ie 17deg btdc

please dont tell me that is wrong my head is already a mess lol *happy*

Yes i moved to the darkside *happy*

Instagram @jdm_brett


Alex

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690 Posts
Member #: 1851
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Woolavington, Zummerzet

26th Apr, 2013 at 11:51:17am

Looks right to me.

Metric is for people who can't do fractions.

BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

26th Apr, 2013 at 07:47:41pm

well yes bret you have the jist buddy






Brett

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9502 Posts
Member #: 1023
Post Whore

Doncaster, South Yorkshire

26th Apr, 2013 at 11:05:31pm

right now to work out what i need, *happy* cheers guys

Yes i moved to the darkside *happy*

Instagram @jdm_brett

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