What's the difference between marine vs street cams? - Chevelle Tech
Performance Our High Performance area

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 6 (permalink) Old Jun 21st, 05, 2:08 PM Thread Starter
Tech Team
 
Join Date: Nov 2004
Location: Portugal Cove
Posts: 47
What's the difference between marine vs street cams?

I have noticed cams for BBC that have great specs that are labelled for marine use. For example Comp cams Extreme Energy 11-236-4, 270/286, 226/236@0.050, .544/.547 lift, 112 LS. It would seem to fall between a XE268 and XE274 for street use. In computer simulations the latter cam makes good power and torque. It's usage is designated as for Jet boat with "A" impeller. Is there some aspect in the design of these cams that makes them unsuitable for street use? Has anyone ever tried the latter marine cam in a street vehicle?
Caplin is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old Jun 21st, 05, 3:09 PM
In Memory of Harold
 
Join Date: Oct 2002
Location: Senatobia, MS, USA
Posts: 1,796
Re: What's the difference between marine vs street cams?

Caplin,

Actually, it's the other way around.....
Most 'street' cams aren't suitable for marine use.
Because of low-speed docking needs and the problem with water entering the exhaust in low-vacuum engines, most marine cams are on 114 or 112 LSA. These work just fine on the street if you want a smoother idle and more vacuum, as well as a flatter torque curve. Many street racers don't, they want the lumpy idle and tremendous mid-range torque, and they use 110 LSAs, and even 108 LSAs.
The old UD BB288/296H10 was designed for Mercury Marine, they bought about a 1000 or so, until the 502 cam out. It was on a 110 LSA, and was at the limit for docking. Going 8 larger at .050 meant that you had to use Rhoades lifters to be able to dock. Vacuum was no problem because the engine did not use an underwater outlet.
Many of my marine cams are made on 114 LSA....

UDHarold
UDHarold is offline  
post #3 of 6 (permalink) Old Jun 21st, 05, 4:02 PM
Team Member
Joe
 
Join Date: Nov 2003
Location: Thornton, Pa
Posts: 12,777
Re: What's the difference between marine vs street cams?

Some info that I picked up - Marine cams use gentler lobes for longevity. IE - a 454 or 502 big block set up in a boat might run at 4500 RPM for hours at a time. That's equivalent to taking your 4.10 geared big block Chevelle down the highway at about 90 MPH without stopping.

For what it's worth, I personally like the Marine cams for street use. Just aggressive enough to make good power without all the extra wear.
GRN69CHV is offline  
post #4 of 6 (permalink) Old Jun 21st, 05, 8:09 PM
Senior Tech Team
 
Join Date: Mar 2000
Location: clearlake mn usa
Posts: 2,084
Re: What's the difference between marine vs street cams?

I know guys who have run marine engines on the street and they run sweet. The Bozo who decides he is going to a killer engine, like he built for the street in his boat has problems. Marine engines need to run at idle for extended periods of time and NOT stall or foul plugs. Some areas may have a No Wake Zone that requires 1 hr at or above idle. Boats regulate engine RPM by prop size or jet size. Larger the prop or pump lower the RPM will normally be. A good stock combo will stay under 5000 rpm at wot. And for how hard they run try 90mph towing a trailer uphill is the equivelent.
daveseitz is offline  
post #5 of 6 (permalink) Old Jun 23rd, 05, 11:31 AM Thread Starter
Tech Team
 
Join Date: Nov 2004
Location: Portugal Cove
Posts: 47
Re: What's the difference between marine vs street cams?

Thanks for the good info-caplin
Caplin is offline  
post #6 of 6 (permalink) Old Jun 23rd, 05, 12:41 PM
Senior Tech Team
 
Join Date: Mar 2004
Location: houston, tx
Posts: 1,293
Re: What's the difference between marine vs street cams?

I have one in my car..Lunati 02005LSK I think was the #. Harold said it above..his description is how my engine runs..just a lumpy enough idle to let you know its there, plenty of vacuum for power brakes (13" at idle), broad/flat torque curve.
jtm60 is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Shaft rockers for the street? VETMANIAC Performance 37 Jun 13th, 05 12:56 AM
Solid Roller Cams in Street Cars GOSFAST Engine 11 Jun 10th, 05 7:19 AM
QTP/ET Street/ ET Street Radial MadMarv Performance 21 May 24th, 05 10:05 PM
Off-idle bog, carburetor cams and pump shot info Xtreme70SS396 Performance 5 Jun 7th, 04 10:55 PM
Mercrusier valves - OK for street use supersport6667 Performance 4 Feb 18th, 04 10:54 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome