MILD THUNDER

iTrader: (3)

is there a rev limiter ? Which merc ignition?

Mohavvalley

It's a TB-4, merc cap, MSD blaster 2 coil, MSD 6A (not sure if i need to run this), and not sure on the Rev limiter, what does it look like, or what's it marked?

I know there's a adjustable knock sensor module up by the cockpit too.

Thanks

Griff

The Crane cams can be run with the stock iron distributor gear.

Stock 525SC has rev limit at 5350-5400 rpms. Rev limiter is part #41 Genuine Mercury & Mercruiser parts. WIRING HARNESS AND ELECTRICAL COMPONENTS

Mohavvalley

Thanks Griff, I went through my dissassembely pics and I don't have one of under the ignition module... So I'm not sure if there was a Rev limiter on there or not..

Should I remove it when I put it back together or just wait while I'm running the 177, until I put on the 6v-71?

Also I'm running the original distributor, does that have anything to do with what gear I should get on the cam?

Thanks

Mohavvalley

From the RPMs I want to run, I'm assuming I'm going to remove the Rev limiter, wither it's on the initial rebuild or when I upgrade the blower.

So should I run the everwear/melonized gear on the cam?



So I noticed the crane 741 and the 525efi can both have higher lift on the exhaust VS. the Lunati's that have higher lift on the intake, running a low boost blower, what effects will going one way VS. the other will there be? For example will exhaust valves heat up more with more intake lift, will get more cylinder pressure with the higher intake lift, etc...?

SB

iTrader: (1)

Don't look into it much when exh valve has slightly less or higher lift than the intake.
When exhaust has higher lift than intake, it is usually because it is the next larger lobe in the catalog in the same lobe family.

Exh under much higher pressure when exh valve opens than intake when intake opens. Thus why more important to have larger int valve at the expense of a smaller exhaust.

Oh, please don'r compare exh valve and pressure escape to a soda can. That doesn;t work well.

Baja Rooster

iTrader: (1)

Mohavvalley

Ok I've done some more research and it seems to come down to 2 choices for the pressed on distributor gear on the cam. I'm running a HV melling oil pump, so whats a better combo

1) Get the "everwear" gear pressed on the cam and run the original melonized distributor gear
OR
2) Get the standard iron gear on the cam and run a Howard's bronze distributor gear?

Which combo will last longer pushing the HV pump?

Ryan00TJ

iTrader: (8)

Choice #1. Never had a problem. Never liked the idea of a bronze gear wearing and depositing that into the oil. Which then goes thru your bearings.

Mohavvalley

I've also done some more research and it looks like I can run a gen 6 step nose cam with retainer plate. I have 2 threaded holes at noon and 6, so I can run the retainer plate vertical instead of horizontal?

If I run the gen 6 step nose cam with retainer, I do have to run a gen 6 timing set due to the smaller Diameter cam gear bolt pattern.