Testing a Gaffrig Speedo ?
#1
Registered
Thread Starter
Join Date: Mar 2006
Location: Lake Norman, NC
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Testing a Gaffrig Speedo ?
I would like a quick way to test a Gaffrig speedo.
Seem to remember someone posting a table that
showed PSI to MPH readings. But now I can't find it.
thanks
Seem to remember someone posting a table that
showed PSI to MPH readings. But now I can't find it.
thanks
#4
Offshoreonly Advertiser
Offshoreonly Advertiser
could have sworn I posted this already this am-
MPH = 8.31 * square root(psi)
MPH = 8.31 * square root(psi)
__________________
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
#5
Registered
Thread Starter
Join Date: Mar 2006
Location: Lake Norman, NC
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Hey thanks that is what I was looking for.
So if my math skills are still intact, I come up with the following:
MPH PSI
10 = 1.4
20 = 5.8
30 = 13.0
40 = 23.2
50 = 36.2
60 = 52.1
70 = 70.1
80 = 92.7
90 = 117.3
100 = 144.8
I'm surprized that all of the cheap rubber pitot lines that I see just don't
become balloons.
So if my math skills are still intact, I come up with the following:
MPH PSI
10 = 1.4
20 = 5.8
30 = 13.0
40 = 23.2
50 = 36.2
60 = 52.1
70 = 70.1
80 = 92.7
90 = 117.3
100 = 144.8
I'm surprized that all of the cheap rubber pitot lines that I see just don't
become balloons.
#6
Registered
Hey thanks that is what I was looking for.
So if my math skills are still intact, I come up with the following:
MPH PSI
10 = 1.4
20 = 5.8
30 = 13.0
40 = 23.2
50 = 36.2
60 = 52.1
70 = 70.1
80 = 92.7
90 = 117.3
100 = 144.8
I'm surprized that all of the cheap rubber pitot lines that I see just don't
become balloons.
So if my math skills are still intact, I come up with the following:
MPH PSI
10 = 1.4
20 = 5.8
30 = 13.0
40 = 23.2
50 = 36.2
60 = 52.1
70 = 70.1
80 = 92.7
90 = 117.3
100 = 144.8
I'm surprized that all of the cheap rubber pitot lines that I see just don't
become balloons.
#7
Registered
Thread Starter
Join Date: Mar 2006
Location: Lake Norman, NC
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Just went over and tested my friends Gaffrig speedometer.
After I blew about a pint of nasty milkish liguid out of the pitot line. (with an air compressor)
40 PSI showed 60 mph. So off it goes to Gaffrig.
Will be interesting to see what it reads after calibration.
Edit: He pulled the speedometer and about a shot of liguid poored out.
I say replace the tubing.
After I blew about a pint of nasty milkish liguid out of the pitot line. (with an air compressor)
40 PSI showed 60 mph. So off it goes to Gaffrig.
Will be interesting to see what it reads after calibration.
Edit: He pulled the speedometer and about a shot of liguid poored out.
I say replace the tubing.
Last edited by whatabout1; 02-05-2008 at 05:40 PM.