Re: this really sucks?
 

Jonas, I Have Been Looking At Your Boat For The Last Couple Of Days And The Thought Has Crossed My Mine A Couple Of Times, Looks Like You Have The Perfect Set Up. Email Me With Your Info, Lets Talk.

Re: this really sucks?
 

Sereamachine:

Here Are The Cam Specs

Gross Lift .588 In .596 Ex

Duration @.006 277 In 287 Ex

Duration @.050 228 In 232 Ex

Lobe Sep 114.00

Lobe Lift .3460in .3510 Ex

Re: this really sucks?
 

no email set up for you in oso, here is my info.
email;
[email protected]
or call me in my office is probably best;
925 516 4654

Jonas

Jonas A. S. Eklund
BWC MORTGAGE
APPLY ONLINE
FAST & EASY
WWW.FASTLOANS1.COM
925 516 4654 OFFICE CA.
011 52 322 221 2296 OFFICE MX
925 887 6627 FAX
925 437 2279 MOBILE
Becky Kent
assistant
925 513 2307 OFFICE
925 698 6647 MOBILE
As always, appreciate your business!
Thank you for your referrals!

www.californiafastboats.com

Re: this really sucks?
 

I agree with everyone that you need to verify the rev limiters are not holding you back. You should be running faster with bone stock 502's. Hope it's an easy fix.
Dan

Re: this really sucks?
 

I have been following this post.

Who made the cam and what is the compression ratio?

The duration on that cam is very mild.
Not much different than stock.

My quick reference book shows
The stock cam that was in the 502 engine
merc #431-850478 Gen VI Roller
224 224 @ .050 and 115.5 lobe seperation
.483 .483 lift

The 500HP is
222 230 with .576 .598 lift with a 110 lobe seperation

Re: this really sucks?
 

how many hours on the motors?

i had my 502 rebuilt last year. first time out, it would BARELY get on plane. Second time out, it got on plane a bit better. By the time i had a few hours on it and was ready to open it up, it was running pretty good. 20 or 30 hours more, and it's definitely jumping out of the hole faster and running faster on top end.

also, i know jack about cams. maybe most of your HP gains were at different RPM's, ie: lower RPM's. My boat went about 3 mph faster when i went from a 19" prop that had me spinning 5100 rpm, to a 23" (borrowed) prop that only let me spin to 4400. I'm going with a 21" prop that will hopefully put the revs in the 4800 rpm range. I think RPM's on these big motors is what hurts them most.

Take it easy on the motors until they have a few hours, then try more prop.

Re: this really sucks?
 

Briana,

Have you rechecked your timing?

This is a bit of a long shot (but it ran me around for while) if you have a noise lifter or rocker your computer could be sensing knock and retarding your timing. I had this problem on one motor and I lost 4mph until I figured it out.

Re: this really sucks?
 

cams are crane

What ever happened here???