Stock 502 Cam Specs..????
 

Looking for the stock cam specs for a
1999 502 MAG MPI??

Thanks

hydraulic roller 224/224 on 115.5 .483/.483

thanks :p

Do I smell more upgrades? Maybe hitting the 90 mph!!:D

Well Mark, it's like this..... New AFR Cnc Heads, and 731 cam. so far the numbers come up to be 844HP compared to the little 650 hp I had:D:D:D And if I seen 82 with 650 hp, I would think 200 more should put me well into 90 mph, or at least 89:crazy: :crazy:

Kanookstr,
That is a nice increase in power. Are you still using the same procharger, or did you upgrade that also. I am at about the same speed and setup, only with a whipple, and might be looking at upgrades in the future. I think 90 should be no problem. I like hearing about projects like this.:D :D

Well, that's what Dennis Moore says in his book, but I think there may have been a change sometime around 1998. The Mercury service manual shows:

211/227 ; .512/.512 LSA not specified

Can anyone confirm?

No 28Eliminator, I plan on running the same boost, so I'm staying with the same procharger. I will be recalibrating the ECU though:)

the 224/.483/115 cam is a carb mag profile. I honestly don't know what the later mag motors ran for a cam (not saying that it was or wasn't different, just saying the specs above were mag carb motors thru 1992 for sure..

Ya this is the 1999 502 MAG MPI.
I know the cam part number, #431-850478
but it doesn't give the specs???:(

Claude, if you pull it, can't you send it to Comp Cams and they will read the profile for you? But maybe you're like me, you want to know BEFORE you pull it. It costs about $225 to buy one if you want to do that instead of tearing your motor apart first.

Let me know if you are able to confirm the profile, but I think it changed with the MPI motors.

The main reason I wanted to know the specs was for the programer. It makes it easier for him to calculate the difference between the cam I have in there now,(stock) and the one I am putting in. Crane powermax 168731

226/236 .587/.610

Kanookstr, Keep us posted with the progress. It sounds like you are making a Funsation out of that Sunsation.
Which computer do you have on that. I'm not sure when they changed them, but I have a MEFI1. 1997 How much smaller did you have to go on the pully to get the same boost.

Crane will probably read your old cam for you.

What LSA do you have on your 731? 114deg ?? I'm assuming any less than that would not work well with the blower.

If you use a degree wheel and a dial indicator you can figure it out yourself.
You'd want to degree your new cam anyway to check if you got what you ordered.

DAVE

Ric232, It's a 112 LSA , but I'm running the cam 4° advanced.

Dave, the problem with doing it myself is that I won't have the block back till the end of the month. I kinda wanted to send out my MEFI3 now so I would end up with everything back around the same time.;)

Claude,

Who is doing your ECU? Are you going to get a chance to try the reprogrammed ECU on the dyno, or are you confident that you can tell if it is working properly w/o a dyno?

The reason I ask is that I have an engine builder who can do a 500hp buildup on my motor, but he does not handle ECU reprogramming. Can the ECU programmer figure out what to do just by having the old specs and new specs on the motor?

Claude,

Sorry to go OT, but I thought you might object to this claim:

http://www.tmpsl.com/stingray.htm

211/227 ; .512/.512 LSA ??

the 330 cam was 213/217 .47/.483 and went to 206/211 for the gen 6 roller 310hp


a 1999 502 efi mag Gen 6 roller I had was 224/224 .483/.483

an earlier flat tappet mag cam on a GEN V (pre gen 6 roller) was .512/.512 but 211/227 doesn't sound right but I no longer have the documentation for it

Thanks for the Info ursus.:)

Ric232, I went with AZSM, They did it once when I went Procharged, And the thing ran flawlessly. I also went with there 50lb injectors and 2 bar MAP sensor. If you go to this page. AZSM ECU Recal There is a form you can download and print. You just fill it out with all the specs they ask, and send it along with the ECU. I did not Dyno, but did do a few plug readings. I also run a dual EGT gauge so I can tell at a glance if theres anything out of the norm. I never build an engine with out one any more!!!:)

I should probably send them an Email of what's the fastest to date huh....LOL Mine had around 75 HP more:D:D
But in reality I don't have that boat anymore, and when I sold it, I sold it with a stock 502 MPI. So actually it just might be the fastest when there done with it;)

Well I got an Email from Jim Shofner(from AZSM) today telling me that they have had great success with a program they have for the procharged 502 with Alluminum heads and a Cam with a 226/236 Duration and a .587/.610 lift. And wouldn't you know it. The crane cam I ordered #168731 is exactly that:):) Gotta love when a plan comes together:D

I told him which heads I have coming:)

I'm just telling you what the Merc service manual says for the Gen VI. Did you actually "read" the profile on your 1999 502 Mag MPI ??

I know you sold it (I sold my 20' Stingray a few years ago as well). But your boat is still a legend in my mind. Besides, the guy in the 200LX is going to die if he goes 89 in that boat.

My guess he will be in the high 70's to low 80's.
I wish him luck and fun. God knows I had fun with mine:D:D