Wildchild212

I have ran a search and could not find the cam specs for a 525sc. Does anybody have info on this cam?
Mark

CMS Racing

I will pull in up tomarow at the shop and reply later in the evening

bpine

Mark this is out of my 1994 Merc hi-pro book for the HP 525SC 7.4l 454

Lifter type--Hydraulic
rocker arm ratio-- 1.7:1
valve lift intake .530 exhaust .531

Lobe lift intake .312 exhaust .324

Duration at .050 intake 298 degrees and exhaust 306


Bryan

Wildchild212

Thank you bryn and cms. Is this cam a full roller? what is the lobe seperation.

bpine

Mark it is a standard Hydraulic cam, not a roller lifter cam!

the book doesnt give a lobe seperation!

Bryan

rmbuilder

Mark,
It's a 114* LSA on a 109* ICL.
Here is the timing card for that cam.
http://www.cranecams.com/?show=brows...61&lvl=2&prt=5
Bob

Wildchild212

My exhaust is thru the transom, but it is under water. Is this going to be a problem with reversion? I am running Revolution exhaust, and there is a dam built in to help prevent reversion. Thanks for the help guys.
Mark

articfriends

Bryan,theres got to be a mistake in your #'s!!!I'm sure you must have mean't 298-306 advertised,even a top fuel dragster doesn't have that much duration at .050(I'm not trying to be critical,just trying to help)Smitty

Wildchild,i'm running almost identical duration(.228/.236 at .050) but with a touch over .600 lift,my motor idles at 10 inches vacuum at 675 rpm's in gear . My exhaust is thru y-pipe and thru transom with water injected right after headers end w/no reversion (but it is a 540),on the cam card for the 525sc crane does reccomend above water exhaust,you'd hate to install it just to find out it won't work,maybe someone out there is running same cam with your exhaust and can shed some light on it (or tell you not to do it)

bpine

Smitty, you should be critical! I believe wrong information is worse than no information! Here is a scan out of the Merc Hi performance service manual #3
are you saying I should run this cam in my Alcohol Dragster! "JUST KIDDING!

Is the Merc book WRONG, DOH

http://www.offshoreonly.com/forums/a...id=95342&stc=1
http://www.offshoreonly.com/forums/a...id=95341&stc=1

bpine

Lets try this again!
http://www.offshoreonly.com/forums/a...id=95343&stc=1

Sorry if I miss-led anyone, it was late and as I stated the information was from the manual. I never though about double checking God Almighty Mercury Racing!