Offshoreonly.com - Afr heads with PAC 8002 spring upgrade.

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- - Afr heads with PAC 8002 spring upgrade. (https://www.offshoreonly.com/forums/general-q/344089-afr-heads-pac-8002-spring-upgrade.html)

getrdunn

01-26-2017 10:41 PM

Quote:

Originally Posted by MILD THUNDER (Post 4523337)

Pushrods. Don't forget the pushrods!

MT 100 % correct but you'd think most going to different ratio would consider such such. If they don't urn they don't belong changing ratio. Although I have to be honest on lower hp builds 550 and less ive done it with no changes. But that's pure luck perhaps or just the way alignment worked out and nothing changed on valve tip. But I will say lobe profiles etc have changed much since then but regardless anybody who doesn't check pushrods length even on stock rebuild is asking for trouble.

MILD THUNDER

01-26-2017 10:42 PM

I was meaning wall thickness/diameter in regards to pushrods . But yes, length too !

SB	01-27-2017 09:33 AM

Quote:

Originally Posted by MILD THUNDER (Post 4523008)

Duration itself, is in a way a mathmatical result of what a particular engine may need, to operate at a given RPM.

Just fooling around, but for example, plugging in a 4.25 bore, x 4.60 engine, (565ci),

a 236* intake lobe, would max out at 5952 RPM. Adding 3* at .050, would make it a 239*, and now, that is good until 6067 RPM. So, RPM capability went up 100rpm, just from the rocker change.

For that engine to achieve 107% VE, you will need a cylinder head that can flow 345CFM, at peak piston demand or 74* crank angle.

I missed this earlier ^^^

I thought you ran FullForce's 540 motor on the sim and came out with around 250 at .050" ?

MILD THUNDER

01-27-2017 09:40 AM

Quote:

Originally Posted by SB (Post 4523476)

I missed this earlier ^^^

I thought you ran FullForce's 540 motor on the sim and came out with around 250 at .050" ?

Totally different programs . This calculation was using "pipemax". It was just for calculation. It does not factor in port speed, port cfm, and so on.

Rookie

01-27-2017 10:08 PM

Quote:

Originally Posted by getrdunn (Post 4522698)

Did you ever figure out what bearings you had in the engine you posted a pic of the bearings out of.

ACL (Engine Pro Race Series bearings) Couple links at the end of the thread.
http://www.offshoreonly.com/forums/g...9-years-2.html

Panther

01-31-2017 02:39 PM

Quote:

Originally Posted by SB (Post 4523294)

Sorry to side track for a second...forget what you had for a prop Panther on Lil Mo.

It was a Mirage plus. I think a 23", I can't remember back that far. It's going to be interesting to see what the Blackhawk does! :eekdrop:

LTZCrew

12-18-2019 12:13 PM

so, not to bring up a dead one
but the AFR 8002s wont cut it for a boat motor thats looking to spin 6k with boost?

Full Force

01-12-2020 07:00 AM

Quote:

Originally Posted by LTZCrew (Post 4718932)

so, not to bring up a dead one
but the AFR 8002s wont cut it for a boat motor thats looking to spin 6k with boost?

I would contact Pac and tell them cam specs and what it's being used in, they will get you set up

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