Offshoreonly.com - Cam Specs

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Cam Specs (https://www.offshoreonly.com/forums/general-q/342499-cam-specs.html)

getrdunn

11-08-2016 10:12 PM

Quote:

Originally Posted by mike tkach (Post 4498871)

i agree but the op still does not have his answer.i will make a call in the morning to get the answer if no one posts it sooner.

Yes Mike that would be great. Last thing I like to do is misinform someone. I really do appreciate it. Tks
John
Btw Hope all is well.

14 apache

11-09-2016 10:14 AM

Quote:

Originally Posted by C1000 (Post 4498677)

What are the cam specs for the 900sc merc engines? I do know that they are solid roller.

.050 intake opens 18.0 BTDC Closes 54.0 ABDC 108* 252*
Exhaust Opens 64.5 BBDC Closes 12.5 ATDC 116* 257*

Lobe .395 @valve .672
Advertised I 290* Ex 295*

Crane PN CHB2900009
Lash .030 HOT

C1000

11-09-2016 10:48 AM

Thank you to everyone. That is the information I was loking for!!

mike tkach

11-09-2016 12:46 PM

Quote:

Originally Posted by 14 apache (Post 4499071)

.050 intake opens 18.0 BTDC Closes 54.0 ABDC 108* 252*
Exhaust Opens 64.5 BBDC Closes 12.5 ATDC 116* 257*

Lobe .395 @valve .672
Advertised I 290* Ex 295*

Crane PN CHB2900009
Lash .030 HOT

if you subtract the .030 lash the lift at valve will be .642.if i were rebuilding a sc900 i would go with a tight lash cam.some think tight lash cam,s are something new but i remember using them 20 years ago.

getrdunn

11-09-2016 02:38 PM

Quote:

Originally Posted by 14 apache (Post 4499071)

.050 intake opens 18.0 BTDC Closes 54.0 ABDC 108* 252*
Exhaust Opens 64.5 BBDC Closes 12.5 ATDC 116* 257*

Lobe .395 @valve .672
Advertised I 290* Ex 295*

Crane PN CHB2900009
Lash .030 HOT

Almost spot on what I have on cam card from bullet for 1075 also. Lift, duration as well as timing events. Cool. Tks for posting. Appreciate it.

getrdunn

11-09-2016 02:43 PM

Quote:

Originally Posted by mike tkach (Post 4499108)

Why is that Mike and what is it that determines normal vs tight lash on SR. I've seen them advertised and know it's nothing new but just how does that work on a SR? (Lobe profile)? Now tight lash solids rollers on a billet hyd roller cam is something we've been doing with great success for many years also zero problems.

mike tkach

11-09-2016 05:07 PM

tight lash means the camshaft,not the lifters,i am not sure but t think the lead in ramping is different on a tight lash cam vs normal lash cam,normal being .024 to .032.i recently used a tight lash solid roller cam and the cold lash is .004.try setting that with a stud girdle.

Black Baja

11-09-2016 05:58 PM

Quote:

Originally Posted by mike tkach (Post 4499174)

Last one I did was .002 cold

getrdunn

11-09-2016 06:39 PM

Quote:

Originally Posted by Black Baja (Post 4499188)

Last one I did was .002 cold

How much more on the exhaust?

SB	11-09-2016 06:48 PM

I never understood the old school .030" lash cams. Way too much clearance.

If you are going to get a Bullet 'copy' ask them first what lash.

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