RH Cam

[flabum]

Ok, i have answered a bunch of questions here, now I have one. We are doing a project with a replica mahogony boat.

Is there a marine 5.0/5.7 litre Vortec sbc roller cam available for RH rotation? Crusader has a flat tappet available, but we want roiller.

 

[JCF350]

Re: RH Cam

Phone number is at the bottom of the page.

"http://www.cranecams.com/pdf/Page642.pdf"

 

[Mkos1980]

Re: RH Cam

Yup. Mercruiser has one. My dads neighbor has twin 350 inboards in his 00 Searay. Vortec motors and one is counter.

 

[flabum]

Re: RH Cam

I searche all through Merc, but did not find a roller cam for a RH motor. They have flat tappet RH cams, but not roller.

 

[Orioles2001]

Re: RH Cam

No selling on the forums.
Send him a PM.

 

[flabum]

Re: RH Cam

What condition? gears included?

 

[starsnstripers]

Re: RH Cam

Bran spankin shinny sparkly new with or without gears, with is more money though. lol

 

[j_cizzo]

Re: RH Cam

just to let you know about the cam thing, there isn't any RH cam, they just use a gear drive to allow for the engine to rotate opposite directions, but the cam will rotate normal... they have to, not only do the lifter bores depend on it, but so does the distributor and oil pump...

 

[Haut Medoc]

Re: RH Cam

I beg to differ on that.....
Why would the firing order be different if it was not a RH cam?....
While it is true that MCM's achieve counter rotation through the sterndrive, MIE's are counter rotating engines.....​

 

[rodbolt]

Re: RH Cam

and not all MIE have a RH rotation on the RH shaft.
mostly cause its to easy to use the standard production LH motor and reverse it at the clutch. odds are incredibly high the above posted searay is set up like that.
with RH rotation engines it requires a different starter,distributer drive gear,rear main seal add a steel roller cam and you have to use the correct dist drive gear for the roller cam. use of the standard flat tappet cam drive gear on a steel roller cam will lead to early drive gear failures.

my advace, go with 2 LH engines and reverse the output on the stbd side clutch.
most velvet drive clutches cn be revered, all ZF clutches can. its not hard at all.
but myself I have never run acrossed a RH motor with a roller cam as a standard production feature.
if money is no object try crane or Luanati or competion cams.

bean counters pretty much shut down RH engines.

 

[j_cizzo]

Re: RH Cam

I beg to differ on that.....
Why would the firing order be different if it was not a RH cam?....
While it is true that MCM's achieve counter rotation through the sterndrive, MIE's are counter rotating engines.....​

the firing order probably isn't different, just reversed... what 'was' the number 2 cylinder, now 'is' the number one...

there are two methodes to doing reverse rotation: A) reverse the rotation of the engine itself, or B) flip the drive into reverse and put an opposing prop on it. A) is best.

here's the dilemma, if you were to actually reverse the engine's rotion at the cam, then the distributor drive wouldn't last because that style of gear is rotation-dependant, and the oil pump wouldn't work, it would be operating in reverse, as if drawing oil from the galley's and pumping it into the oil pan, think about it... makes sense...

 

[Haut Medoc]

Re: RH Cam

the firing order probably isn't different, just reversed... what 'was' the number 2 cylinder, now 'is' the number one...

there are two methodes to doing reverse rotation: A) reverse the rotation of the engine itself, or B) flip the drive into reverse and put an opposing prop on it. A) is best.

here's the dilemma, if you were to actually reverse the engine's rotion at the cam, then the distributor drive wouldn't last because that style of gear is rotation-dependant, and the oil pump wouldn't work, it would be operating in reverse, as if drawing oil from the galley's and pumping it into the oil pan, think about it... makes sense...

No......
Read Rodbolt's post.....
He 'splains way better than me....

 

[rodbolt]

Re: RH Cam

J cizzo
how many RH motors have you actually rebuilt or worked on ?
years ago the old hotrod gear drive setup allowed the cam to rotate RH while the crank still rotated left, then came the pete jackson style gear drive with an idler and later a floating idler that required no machine work.
yes on the marine RH motors we actually have both cam AND crank rotating RH, the oil pump and distributer drive gear,in some cases the complete distributer, was different as were the rear main seals and the starter.
wanna see someone cuss, let them use a LH main seal on a RH mtor .
I never did it but I have seen it done .
but like I said, the bean counters have pretty much made everything LH now. it simply cost to much for such a limited market to manufacture all the RH stuff when most modern cluthes can be made bi-directional, some have to have the pump flipped, others its as simple as changing from push for fwd to pull at the bellcrank.
last RH cam I needed was for a late seventies 440 chysler, crane built it, but it tok nine weeks, I had to send in the old cam and it cost my customer almost 800 for a cam.
and that was about 1992.