camshaft layout

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Chlluk
Posts: 1
Joined: Sun May 31, 2015 4:09 am

camshaft layout

Post by Chlluk » Sun May 31, 2015 6:02 am

Hi
I'm currently reworking the Westbury sea lion, i'm taking it up to 6 cyl. I need help with the camshaft layout. The crank will be the normal 120 deg phasing and sequence should be 153624 which I believe is normal. The 4 cyl cam has lobe pairs at 90 deg spacing 1 and 4 set at 180 apart and 2,3 at 90 deg intervals to 1 and 4.
I am aware that an inline 6 will have cam lobes at 60 deg spacing but its the order in can't seem to think out.
if anyone can help by describing what the cam lobe groups setting should be starting at lobe pair 1 with inlet cam set at 0 deg this would help a lot.
Regards
Clive
UK

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ken572
Posts: 2600
Joined: Sun Mar 14, 2010 8:11 pm
Location: Mesa, Arizona. 85201-1517

Re: camshaft layout

Post by ken572 » Sat Jun 06, 2015 8:36 pm

Chlluk wrote:Hi
I'm currently reworking the Westbury sea lion, i'm taking it up to 6 cyl. I need help with the camshaft layout. The crank will be the normal 120 deg phasing and sequence should be 153624 which I believe is normal. The 4 cyl cam has lobe pairs at 90 deg spacing 1 and 4 set at 180 apart and 2,3 at 90 deg intervals to 1 and 4.
I am aware that an inline 6 will have cam lobes at 60 deg spacing but its the order in can't seem to think out.
if anyone can help by describing what the cam lobe groups setting should be starting at lobe pair 1 with inlet cam set at 0 deg this would help a lot.
Regards
Clive
UK
Hello :!: Chlluk :D

Welcome to The Home Machinist! 8)
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Tilden Technologies, LLC (Very Informative)
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Ron's Model Engineering and Model IC Engine Projects
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dly31
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Joined: Sun Jun 27, 2004 11:29 pm
Location: Northeast Alabama

Re: camshaft layout

Post by dly31 » Tue Jun 09, 2015 10:00 pm

Since there haven't been any replies by someone who really knows the answer to your question, I will offer what might be a little help. It seems to me that the camshaft order has to be the same as the crankshaft. If #1 inlet cam is at 0 degrees, #5 should be at 60 degrees, opposite to the direction of rotation. This will make #5 inlet open 60 camshaft degrees (120 crankshaft degrees) later than #1. This is so #5 cylinder will be the next to fire, 120 crankshaft degrees after #1 fires. The other cams follow in firing order sequence at the same angle in the same direction. In 360 camshaft degrees (720 crankshaft degrees) all cylinders will have fired in the 153624 sequence, the most common for a 6 cylinder inline engine. Keep crankshaft and camshaft direction of rotation correct, the same if chain driven or gear driven with one idler and opposite if chain driven without an idler.

Don't take this as absolutely correct, just as help in figuring it out for yourself since I have never made a camshaft but just understand engine operation pretty well. If you figure out that I am all wet, let me know!
Don Young

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