Cams-are-us!

A spot for any one considering making or selling reproduction parts-please put parts for sale in the vendors ad section

Moderators: garth, notoptoy, S Allen

JT68
Talented Enthusiast
Posts: 1806
Joined: Sun Jan 27, 2013 9:43 am
Location: Cumming, GA

Cams-are-us!

Post by JT68 » Wed May 02, 2018 7:59 pm

Lots of great choices for you1

https://www.datsunrestorationproducts.com/shop-13

BEST, JT
JT/LT
Datsunrestorationproducts.com
The very finest parts for your 311!

User avatar
bakerjf
Site Supporter
Posts: 1217
Joined: Wed Sep 07, 2011 5:48 pm

Re: Cams-are-us!

Post by bakerjf » Wed May 02, 2018 9:25 pm

Good deals!
J. Baker
Cupertino, CA
'69 2000 (Solex)

User avatar
2mAn
Roadsteraholic
Posts: 1554
Joined: Mon Jan 09, 2017 5:02 pm
Location: Inglewood, CA

Re: Cams-are-us!

Post by 2mAn » Wed May 02, 2018 9:47 pm

Whoa!! Tell me about the RB Cam! Which would be better to take advantage of my oversized header ?
Simon
Current Cars:
-1986 BMW 325e - pursuit of happiness
-1968 Datsun Roadster 2000 - happiness of pursuit

User avatar
spyder
Roadster Fanatic-Site Supporter
Posts: 2050
Joined: Tue Apr 12, 2005 1:43 am
Location: Live Oak, TX.

Re: Cams-are-us!

Post by spyder » Thu May 03, 2018 3:18 am

How is the duration measured? Total duration or measured at .050

JT68
Talented Enthusiast
Posts: 1806
Joined: Sun Jan 27, 2013 9:43 am
Location: Cumming, GA

Re: Cams-are-us!

Post by JT68 » Thu May 03, 2018 12:31 pm

That's a really good question. First these are all street/autocross cams with the RB and the C being the most radical. None are full race cams.

As the link says, the A,B and C cams are exact copies of Nissan cams. The numbers displayed for the Nissan Cams are measured more like Nissan did which was somewhere in the .010-.025 ~.017" lift point.

So if using the "american standard" of duration at .050 the Nissan grinds would be 25 or 30 degrees less give or take.

The RB and the C pretty similar and are the lumpiest, with about 250-260 degrees at .050". Their total duration is over 330 and lobe lift is similar.

To answer Simon's question, yes the RB would be a fine choice with solexes and his setup. The larger primary tubes moves the optimal rpm range up by 1000 or so rpms so you would want the cam to be "on" (dialed in) for 7.5k-8k+ operation.
JT/LT
Datsunrestorationproducts.com
The very finest parts for your 311!

User avatar
jrusso07
Roadsteraholic
Posts: 1266
Joined: Sat Aug 02, 2008 9:02 am
Location: Penn Yan, NY

Re: Cams-are-us!

Post by jrusso07 » Thu May 03, 2018 6:00 pm

...must stop salivating.
Joe

1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
1971 PL510 L18-SSS
1972 HS30

User avatar
Gregs672000
Roadster Fanatic-Site Supporter
Posts: 6501
Joined: Fri Aug 07, 2009 11:47 pm
Location: Tacoma, WA

Re: Cams-are-us!

Post by Gregs672000 » Thu May 03, 2018 6:18 pm

Thanks for clarifying the duration specs as I was looking at my Isky noting a 248 duration at .50, which is exactly where I want it, and wondering why the B and C cams had such different durations vs this cam. The Isky has a lot of lift though, .536 (according to the website, it's .499, but per Delta and their cam doctor it was .536). We'll see if the rockers can handle that, the springs are tight but are not coil binding per feeler gauge...
Greg Burrows
'67 2000 #588
Tacoma, WA