Offshoreonly.com - Intake Runner volumes

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Quote:

Originally Posted by sutphen 30 (Post 4423855)

could be the cam was retarded 4° from the get go over the spec,and advancing it put it back to straight up.

No, I degreed it ....

Quote:

Originally Posted by SB (Post 4423840)

Always a fair point, however it seems someone always says this no matter what performance part thread.

Tuning - fuel / ignition
Exhaust - we here this all the time
Cam / Head / Intake etc
Oil Level

Well, who would want a 560-hp engine if it could make 600 ?

That's for the owner to decide.

And yes, some boats will respond to smaller hp additions than others....so that is a factor.

That was my last build he's referring to... In was in my little Checkmate... :evilb:

Unfortunately, I didn't get to test the cam timing change back to back on the water...

My goal was RPM..
I had a ton of $$ tied up in my prop and my current engine (Iron head 509) could only spin it to 5200 RPM

When I freshened my engine, I changed to AFR heads and a new cam.

On the dyno it was starting to lay over at 5300 RPM.
It may have been caused by one of the accessories, not sure as we never tested without them.

So we tried retarded the cam timing and it worked out...

Gave up some torque I couldn't use in the first place (stock Bravo outdrive) and got my HP peak where it needed to be.. :)

Doug

As far as intakes go we saw a 10-15 hp change on the dyno with just the intake. Same carb, no other changes. That was just going from the Vic Jr to the 454R, so imagine how much difference there could be between different styles.

Quote:

Originally Posted by bck (Post 4424097)

What intake ?

I edited, while you were typing Vic Jr to 454R.

I've seen the same on bigger motors. I have heard the Merlin Intakes work well, but have never tried them.

Quote:

Originally Posted by SB (Post 4424110)

I've seen the same on bigger motors. I have heard the Merlin Intakes work well, but have never tried them.

Not sure if the marine version of the Merlin X is still available. I had to use what was available anyways, couldnt afford to buy just to test.

Any of you NA guys ever tried a Sniper intake ?

Someone on the boards has a Sniper Jr. I'll have to do a search.

Quote:

Originally Posted by MILD THUNDER (Post 4424125)

Any of you NA guys ever tried a Sniper intake ?

The description says it has a built in spacer. 7.4 carb mounting height, which would make it most similar to the super victor I believe.

My intakes say "454-R VICTOR JUNIOR" What do you mean when you say you switched from the Victor Jr to the 454-R? Aren't they the same, or are you talking about an older Victor jr?