Boost retard
 

How important is boost retard with only a maximum of 4 lbs boost? Im trying to keep my octane in the 90's for this reason and have no noticeable signs of detonation.

How important are melted pistons and blown head gaskets, what is the timing set at now, what compression ratio, what head material, what cam, is there an intercooler, need a little more info.

I just bought this boat less than a month ago. Don't know a whole lot about the motor. What I can tell you is no inter cooler, cast heads, 34 degrees full advance, roller cam ( lift n duration unknown). Working on getting more info on the engine build but no luck yet.

I'm not an engine builder, just thinking 34 might be best suited for an N/A motor, what's the water temp when it's warmed up and running wide open.

About 180 degrees and it is a carbureted ( n/a ) motor.

If its less than 8:1 compression with a specific blower cam, and an appropriately sized blower, I'd drop it to 32 and leave it. No need for boost retard. In fact lowering timing too far is more dangerous.

If it hasn't blown up yet, chances are it won't. I might think about dropping the timing back to 32*, but without knowing more about the engine specs, its hard to say for sure.

having built quite a few blower motors,its of my opinion to keep timing at 30 degrees and 93 octane

[QUOTE=ba3367;3995960]About 180 degrees and it is a carbureted ( n/a ) motor.[/QUO
I'm confused N/A or blower with 4psi

Well it's my understanding they the motor was built specifically for the weiand 177 application but unless I can get the build specs I'm kinda in the dark unless I do a tear down and I don't know that it's worth all that without an eminent issue. Off that subject how do I attach images from my iPhone photo library?

I'm sorry. My bad GPM. I thought u were thinking it was injected.

I'm sorry. My bad GPM. I thought u were thinking it was an injected motor.

No problem, 180 seems warm for a blower motor with cast iron heads, plus 34 degrees of timing, I can't imagine the head gaskets lasting to long, but I could be wrong. Compression and cam would probably dictate the end result.

Without knowing static comp ratio, its hard to give you advice.
If its been built as a basically a 525SC clone, then no worries unless they bumped the static comp ratio to much more than 8.5.
The 525SC runs 5.5 lbs of boost and 35* of total timing with 7.5 CR. I ran my 525SC at almost 8lbs with 35* and 92-93 octane and never had any issue.

I agree that you should try and get the water temp down to around 140-150*.at least.

Ok Griff I'm gonna throw a stupid ? At ya. How the heck do u lower your water temp?

Check what thermostat is in it.

Easy enough. Lol

The stock thermostat for Merc carbed engines 140*. It should stay under 150* with one.
There are also some aftermarket 120* Tstats.