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Anyone know cam specs for 2.7RS?

nine14cats	Mar 10 2006, 12:09 AM Post #1
Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None	I'm searching for the camshalft specs for the 74-77 7R case RS 8.5:1 compression 6 cylinder. Anyone know what it was? Thanks, Bill P.

Replies(1 - 9)

DanT	Mar 10 2006, 12:11 AM Post #2
Going back to the Dark Side! Group: Members Posts: 4,300 Joined: 4-October 04 From: Auburn, CA Member No.: 2,880 Region Association: None	Are we building a 2.7 for the Beast? (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) Now you're talking (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif) Great AX motor. Lots of torque

nine14cats	Mar 10 2006, 12:16 AM Post #3
Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None	I've got a line on a completely rebuilty longblock 2.7 built to RS specs. New Mahle P's&C's. I'm actually second in line so I'll find out this weekend. So I'm doing a littly Desktop Dyno profiling. I have my old motor profile in it with the parts I put in (120/104 cams, Weber 40's, 10.5:1 JE's). I need the cam specs to compare it. I already have a simulation with my old spec engine running JP's 9.7:1 Shasta pistons. For you vultures out there......this engine isn't advertised in EBAY or the bird board... (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) Bill P.

redshift	Mar 10 2006, 12:19 AM Post #4
Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869	I KNOW THE SPECS! You want me to sketch it out? (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif) M

DanT	Mar 10 2006, 12:22 AM Post #5
Going back to the Dark Side! Group: Members Posts: 4,300 Joined: 4-October 04 From: Auburn, CA Member No.: 2,880 Region Association: None	(IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif) Is it top secret?

J P Stein	Mar 10 2006, 12:29 AM Post #6
Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None	The RS spec cams are S cams.

nine14cats	Mar 10 2006, 01:17 AM Post #7
Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None	JP, You runnin' S cams in your motor? (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif) Bill P.

ArtechnikA

Mar 10 2006, 05:54 AM

Post #8

rich herzog

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QUOTE (nine14cats @ Mar 10 2006, 02:09 AM)

I'm searching for the camshalft specs for the 74-77 7R case RS 8.5:1 compression 6 cylinder.

you're crossing boundaries there...

the "real" 2,7RS existed in '72 and '73. by '74, the RS and RSR were based on the 3,0 engine the US didn't get until 1977.

(the '73-'74 RSR was a transitional phase with the 2,8 engine...)

the 2,7RS was considered an evolution of the 2,4S and used the same cams. the injection pump and distributor were modified, as was static timing, and of course the pistons and cylinders were different.

J P Stein

Mar 10 2006, 07:00 AM

Post #9

Irrelevant old fart

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QUOTE (nine14cats @ Mar 9 2006, 11:17 PM)

JP,

You runnin' S cams in your motor?

(IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif)

Bill P.

Nopers. Solex.
I was talked out of S cams by Steve Weiner.
At the time, the motor was a street/AX motor.
S cams (per Steve) have tuning issues with carbs...mostly involving fuel reversion and they don't come on the bump till 4k or so. Considering that the majority of street driving is done on the idle circuit.....who needs the hassle. I had enuff tuning problems with the Solex grind to last me for about 6 mos. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
They come on about 500 rpm sooner also. Both E & Solex grinds give up top end for better mid range.....AX territory.

S & better grinds are tha cats ass for track work, me thinks.

0396

Mar 10 2006, 07:59 AM

Post #10

Advanced Member

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From: L.A. Calif
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QUOTE (ArtechnikA @ Mar 10 2006, 03:54 AM)

QUOTE (nine14cats @ Mar 10 2006, 02:09 AM)

I'm searching for the camshalft specs for the 74-77 7R case RS 8.5:1 compression 6 cylinder.

you're crossing boundaries there...

the "real" 2,7RS existed in '72 and '73. by '74, the RS and RSR were based on the 3,0 engine the US didn't get until 1977.

(the '73-'74 RSR was a transitional phase with the 2,8 engine...)

the 2,7RS was considered an evolution of the 2,4S and used the same cams. the injection pump and distributor were modified, as was static timing, and of course the pistons and cylinders were different.

Rich,

You are one smart cat!
Thanks for the education.

Oh ya..S cams are set @ 5.2 mm (IMG:http://www.914world.com/bbs2/html/emoticons/cool.gif)

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