SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: beerjet on October 05, 2008, 04:21:24 PM

Title: How do you select a cam ?
Post by: beerjet on October 05, 2008, 04:21:24 PM: I have my opinion on this but it is always insightfull to hear other peoples reasons and what is there deciding factors .

-beerjet-
Title: Re: How do you select a cam ?
Post by: Ralph Brunt on October 05, 2008, 04:36:24 PM: Quote from: beerjet on October 05, 2008, 04:21:24 PM
I have my opinion on this but it is always insightfull to hear other peoples reasons and what is there deciding factors .

-beerjet-
get the heads flowed and get a hold of chris straub that takes all the guess work out of it ;)
Title: Re: How do you select a cam ?
Post by: beerjet on October 07, 2008, 07:15:56 PM: I dont know that Joe Schmoe who's rebuilding or building a mild lake rod wants to spend all that money . Believe me , it's ideal .

-beerjet-
Title: Re: How do you select a cam ?
Post by: koyota93 on October 07, 2008, 07:35:56 PM: I would call George at Clay Smith Cams. When I told him what I wanted for my motor rebuild, he told me exactly what I need and which cam to use to add a little more power.
Title: Re: How do you select a cam ?
Post by: GT Jets on October 07, 2008, 07:53:05 PM: I have used the same method for years, find a camshaft that is advertised to run at or very near the engine RPM that you need to be running to make your combo work, using information like; intake runner length and overall size, carb CFM and type, cylinder head port and valve size, exhaust type, CR, limitations of exhaust pulse (use a 112* lobe center to minimize) and so on.. it all needs to work together, otherwise the wrong choice is inevitable.

A lot of the time, a cam manufacturer will make a proven camshaft for certain application, (like circle track, jetboat, drag, etc.) sometimes they are the inexpensive way to go...

I have a "recipe" that I follow, but it's considered top secret :sly:

GT
Title: Re: How do you select a cam ?
Post by: SLCKREG on October 07, 2008, 08:04:34 PM: FWIW ,any type of roller is a good investment imo. I just lost a .....whole motor due to loosing a flat tappett cam. Never again.