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Looking for Mercury cam shaft #818870

M

matt101

New member
This cam shaft has been made obsolete and cannot find anywhere in the country. Please contact me if you have one new or used would appreciate it.
matt@pgnjapan
 
I just did a quick Google search, nothing comes up, and I did enter Mercruiser, not Mercury.

Which engine is this camshaft for?
 
Cam shaft info

http://www.crowleymarine.com/parts/251000.cfm

motor info

600 SC Bobtail 1998 0L414734 THRU 0L601186 (RACE STERNDRIVE)

http://www.smithvillemarineparts.co..._And_Camshaft/16-002-851035-390/COMMON1026576


also

How about the factory 600sc cam, I know its from a little larger cube engine but it gets my vote. Lift is .553/.571 and can be ordered new from Crane pn134561.


also the specs

Here are the specs on the 600 SC cam:
Crane single pattern
Lobe H 240/329
300/300 @.0042
240/240 @ .050
148/148 @ .200
.559/.559
105 ICL
115 ECL
110 LSA
INTAKE 43 BTDC 77 ABDC
EXHAUST 83 BBDC 37 ATDC

Some more spec info,

The 2000-2001 575 SCI
1991-1996 Gen IV/V 600 SC
1998 Gen VI bobtail 600 SC
1993-1998 800 SC
All run the Crane/ Merc # 491-818870 cam I listed above
The 134561 is a Crane catalog cam. It is a dual pattern that specs as follows:
296*/306* @ .0042”
236*/246* @ .050”
144*/154* @ .200”
.553”/ .571” lift valve
109* ICL
119* ECL
114* LSA



Hope this helps..........
 
Last edited:
kghost said:
Cam shaft info

http://www.crowleymarine.com/parts/251000.cfm

motor info

600 SC Bobtail 1998 0L414734 THRU 0L601186 (RACE STERNDRIVE)

http://www.smithvillemarineparts.com/pages/OemParts#%2fMercury_Marine%2f600_SC_Bobtail_1998_0L414734_THRU_0L601186_(RACE_STERNDRIVE)%2fCylinder_Block_And_Camshaft%2f16-002-851035-390%2fCOMMON1026576


also

How about the factory 600sc cam, I know its from a little larger cube engine but it gets my vote. Lift is .553/.571 and can be ordered new from Crane pn134561.


also the specs

Here are the specs on the 600 SC cam:
Crane single pattern
Lobe H 240/329
300/300 @.0042
240/240 @ .050
148/148 @ .200
.559/.559
105 ICL
115 ECL
110 LSA
INTAKE 43 BTDC 77 ABDC
EXHAUST 83 BBDC 37 ATDC

Some more spec info,

The 2000-2001 575 SCI
1991-1996 Gen IV/V 600 SC
1998 Gen VI bobtail 600 SC
1993-1998 800 SC
All run the Crane/ Merc # 491-818870 cam I listed above
The 134561 is a Crane catalog cam. It is a dual pattern that specs as follows:
296*/306* @ .0042”
236*/246* @ .050”
144*/154* @ .200”
.553”/ .571” lift valve
109* ICL
119* ECL
114* LSA



Hope this helps..........
Click to expand...

This is for a Mercury SC800 engine no. OD937089 I will take a look at this info, I appreciate it
Matt
 
Only looking for the cam (Mercury SC800). Looking through the crane info you gave me. I was not aware it was an option to use auto cams as well. Is there any additional customization that needs to be done on it? Thank you I am still a bit green on these issues.
 
Well I dont think anyone knows what it is you are trying to do.

If you have either of these motors and are trying to rebiuld them then the same cam is used for both.

Mercury does not manufacture there own cams. The cams are made by one of the big cam manufactures but when used on a Mercury product is is assigned a mercury part number.

This is a Mercury high perfomance application and I doubt you will find many on this forum who know much about that line of mercruiser products.

Ths forum typically deals with general run about boats with standard mercruiser products.


In my opinion it is obviuos they use the same cam in both motors BUT they most likely have changed either boost, carb size/jetting, possibly blower size, not to mention one is 70 cubic inches larger.

The sc 600 is a 502 cubic inch and the sc 800 is a 572 cubic inch both are factory GM and or crate motors........but have been marinized.

The internals for a marine vs Automotive/truck are the same. Only certain components are different. The cams may be slightly different and would be spected out for max power at a lower rpm than a automotive/truck. But with the HIGH PERFORMANCE product all bets are off................

Actually if you think about it it is easy to achieve 500 hp from a single 4 barrel carbed 454. so 600 hp from a superchaged 502 is rather complacent.
The 800 hp from a 572 is very good but it is mostly accomplished with the blower.....a normally aspirated 572 with the appropriate cam and pistions and head work should be good for 800 hp. Now add a blower and it would actually be closer to 1000 hp without sweating a drop......from what I have read.

Here is the link from before as I think it was bad.

http://www.mercruiserparts.com/selectModels3.asp?type_id=8H
 
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