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Search: Posts Made By: Michael1
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Forum: General Boating Discussion
03-09-2007, 01:20 AM
Replies: 142
Views: 53,515
Posted By Michael1

This is good stuff! :D What temperature...

This is good stuff! :D

What temperature and pressure are you correcting the horsepower to?

I can't wait to hear about the next set of tests. Don't forget to put it all back to stock at the...
Forum: General Boating Discussion
03-08-2007, 04:12 PM
Replies: 142
Views: 53,515
Posted By Michael1

Well said, Ray! Thank you. Michael

Well said, Ray! Thank you.

Michael
Forum: General Boating Discussion
03-06-2007, 01:53 PM
Replies: 142
Views: 53,515
Posted By Michael1

I'm sorry to say it, but the tests I've seen are...

I'm sorry to say it, but the tests I've seen are pretty much meaningless, because the manufacturers of the headers refuse to post baseline data. They also run their tests and correct them for...
Forum: General Boating Discussion
03-01-2007, 11:18 PM
Replies: 142
Views: 53,515
Posted By Michael1

Wow, the Mercruiser engines must run really rich...

Wow, the Mercruiser engines must run really rich to show a horsepower improvement with headers on a speed-density fuel system, with no regulator changes!

The dyno test sounds like a lot of fun. ...
Forum: General Boating Discussion
02-28-2007, 11:04 PM
Replies: 142
Views: 53,515
Posted By Michael1

Without the baseline dyno figures, the dyno...

Without the baseline dyno figures, the dyno sheets with the headers don't mean a whole lot. For instance, what was the air-fuel ratio on the stock engine compared to the one with the headers and...
Forum: General Boating Discussion
02-28-2007, 01:39 AM
Replies: 142
Views: 53,515
Posted By Michael1

Notice that the A/F ratio is much leaner with the...

Notice that the A/F ratio is much leaner with the headers. On the right bank at 4800 rpm, we've gone from 13.15 to 13.87. What happens if we just lean the engine with the stock manifolds?

Michael
Forum: General Boating Discussion
02-27-2007, 11:35 AM
Replies: 142
Views: 53,515
Posted By Michael1

With all due respect, it absolutely does affect...

With all due respect, it absolutely does affect other points of running, perhaps not to the point where you are noticing it with soot. It will richen it by the square root of the pressure ratio.
...
Forum: General Boating Discussion
02-26-2007, 11:09 AM
Replies: 142
Views: 53,515
Posted By Michael1

Just increasing fuel pressure for full throttle...

Just increasing fuel pressure for full throttle is going to put the engine too rich at every other operating point. That's a rather crude way of tuning.

Also be careful of these horsepower...
Forum: General Boating Discussion
02-26-2007, 12:13 AM
Replies: 142
Views: 53,515
Posted By Michael1

How do you get 40-50 more horsepower from an...

How do you get 40-50 more horsepower from an engine that uses a speed-density fuel injection system? Are you having the computer reprogrammed, and, if so, how do you reprogram the computer?
...
Showing results 1 to 9 of 9


 
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