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Author Topic: Andrews A cam  (Read 678 times)

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Offline CalleF

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Andrews A cam
« on: April 27, 2023, 12:31:51 PM »
Hi.
Does Any one have info on what the valve lash should be on a Andrews A cam?
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Offline newday777

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Re: Andrews A cam
« Reply #1 on: April 27, 2023, 02:21:09 PM »
Quote from: CalleF on April 27, 2023, 12:31:51 PM
Hi.
Does Any one have info on what the valve lash should be on a Andrews A cam?
On what bike????? Very important to include that in your requests.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Tim2005

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Re: Andrews A cam
« Reply #2 on: April 27, 2023, 03:02:40 PM »
This is odd.. specs are here but are based on duration .05". I wonder if that should read .05mm, which would make a lot more sense to me  http://www.satanicmechanic.org/andrewscam.shtml
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Offline ekpent

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Re: Andrews A cam
« Reply #3 on: April 27, 2023, 04:29:39 PM »
I've got that same came in an 836 but I am embarrassed that I can't remember exactly the lash. I used to have the paperwork somewhere. I know the gaps are larger then stock. Seems like they were .004 inches. Will see if I can locate the paperwork.
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Offline PeWe

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Re: Andrews A cam
« Reply #4 on: April 27, 2023, 08:31:26 PM »
Quote from: Tim2005 on April 27, 2023, 03:02:40 PM
This is odd.. specs are here but are based on duration .05". I wonder if that should read .05mm, which would make a lot more sense to me  http://www.satanicmechanic.org/andrewscam.shtml
Must be at 0.05" lift  (1.25mm).
Cams are also often timed at 0.04" (1mm) lift.
Higher numbers at 0.04 than 0.05" lift.

In/Ex open/close at x degrees at 0.05" lift.
« Last Edit: April 27, 2023, 08:33:41 PM by PeWe »
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Updates of the CB750 K6 -1976
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CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
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Carb jetting, a long story Mikuni TMR32
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Offline dusterdude

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Re: Andrews A cam
« Reply #5 on: April 28, 2023, 03:26:49 AM »
Andrews doesnt have 750 specs on their website however,550 and 650 specs are .004 thousandths of an inch

Sent from my SM-G973U1 using Tapatalk

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Offline PeWe

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Re: Andrews A cam
« Reply #6 on: April 28, 2023, 06:57:15 AM »
About valve lash.
Compare with the array of Megacycle cams of various profiles.
http://www.satanicmechanic.org/megacyclecam.shtml

Andrews A is a modest cam so 0.004" (0.1mm) would be OK for In and Ex.

I have used 0.10/0.15mm for several cams, (except DP315). Even with Megacycle 125-75 that produced well on dyno last year.

0.1/0.1mm on my stock K2 with K7 cam.
I do not trust the very tight stock lash.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline ekpent

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Re: Andrews A cam
« Reply #7 on: April 28, 2023, 09:24:38 AM »
I remember when I bought my mild Andrews cam it was new and sitting in a nice glass showcase at a dealer who knew Honda's well and I paid either 40 or $45.00 for it back in the early to mid 80's.
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Offline seanbarney41

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Re: Andrews A cam
« Reply #8 on: April 28, 2023, 11:56:51 AM »
Quote from: ekpent on April 28, 2023, 09:24:38 AM
I remember when I bought my mild Andrews cam it was new and sitting in a nice glass showcase at a dealer who knew Honda's well and I paid either 40 or $45.00 for it back in the early to mid 80's.
Action Cycle?
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If it works good, it looks good...

Offline ekpent

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Re: Andrews A cam
« Reply #9 on: April 28, 2023, 01:13:09 PM »
Quote from: seanbarney41 on April 28, 2023, 11:56:51 AM
Quote from: ekpent on April 28, 2023, 09:24:38 AM
I remember when I bought my mild Andrews cam it was new and sitting in a nice glass showcase at a dealer who knew Honda's well and I paid either 40 or $45.00 for it back in the early to mid 80's.
Action Cycle?
Mel's Motorcycle Clinic. It was his newer store that was still really close to his old one that was on Red Arrow Highway.
« Last Edit: April 28, 2023, 02:06:20 PM by ekpent »
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Offline commander60

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Re: Andrews A cam
« Reply #10 on: April 28, 2023, 06:46:29 PM »
I emailed Andrews and the sent the specs for my Twin cam CB1100
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