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03-08-2007 | 11:40 PM

#131

LAKESIDE RESTORATIONS

Lakeside Restorations.com

Joined: Nov 2003

Posts: 2,512

Likes: 2

From: NorthEastern, PA

Quote:

Originally Posted by Raylar

Bob:
Nice start to a great series of eye opening tests! Glad to see my statement about octane not making more power is here in black and white to close that old wives tale! Keep it com'in!

Regards,
Ray @ Raylar

I agree Indeed..

Jamie

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03-09-2007 | 01:20 AM

#132

Michael1

Registered

Joined: Oct 2004

Posts: 1,499

Likes: 48

From: Newbury Park, CA

Quote:

Originally Posted by bobl

Ok guys, we're on our way. Just completed all the base line testing on the test boat. We made 5 different runs with GPS. Different directions and even different drivers. We went from a slowest of 62.6 to a fastest of 63.5. All but one run was under 63. I just finished prop shaft dyno testing the engine. Again I made 3 pulls and they were within 1 HP of each other. So, what did it make at the prop you ask???? 387 HP at 5000 RPM!!! That is a solid 10% loss through the drive.

Another bit of trivia. THe boat has 2 gas tanks. One has 87 octane and the other has 93 octane. I switched to the 87 for one pull and it didn't change the HP one bit.

So, we have our baseline data. We'll get the exhaust switched in the next couple of days and dyno it again.

This is good stuff!

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 end to be sure nothing changed with the powertrain during the tests.

Michael

03-09-2007 | 09:45 AM

#133

bobl

Registered

Joined: Oct 2000

Posts: 1,382

Likes: 3

From: Spicewood, Texas USA

I have an electronic weather station. We are at 800' elevation. Ambient air temp was upper 70's. However I placed the weather station right by the flame arrestor to get a more accurate inlet air temp. That temp was 88 degrees. I'm using the "standard" correction method. The final correction factor was 5%, uncorrected HP was 360.

03-13-2007 | 08:15 AM

#134

Rage

Gold Member

Joined: Sep 2005

Posts: 1,987

Likes: 0

From: Missouri

Excellent test data and test method to insure effects of engine compartment air temperature at flame arrestor versus the general ambient air temperature that these weather stations usually are reading is accounted for. That 10% drive loss hp answers a lot of questions for me.