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Do you think a leakdown test is in order.
http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=14717		 Page 1 of 1
Author:  bbb [ Mon Dec 20, 2010 10:49 am ]
Post subject:  Do you think a leakdown test is in order.
I've been reading all these "28mph unloaded and 26mph loaded" "30mph unloaded and 28mph loaded" posts and it got me thinking.

When I bought my 2010 35hp GDSD, my top speed was 23.4 unloaded. I then changed from a 3 blade prop to a 2 blade prop and my top speed went to 24.5. With 2 other people in the boat, my top speed was 21.5.

Now I've added a Mikuni Carb and Marshmellow exhaust and I can run 27 deep water all day and hit 28-29 in the shallow stuff. But my top speed with 2 others in the boat is still around 22mph.

Just seems like if most people are only losing 2-3mph with a load, something must be wrong if I'm losing 5+mph.

I got the right hull to carry loads well, so its got to be the motor, right?

I have a buddy that owns a shop that was going to do some headwork for me, but after hitting the 27-28mph mark, I wasn't worried about any more speed. But now I'm thinking he needs to take a look at it afterall.
Author:  deadbird8 [ Mon Dec 20, 2010 11:46 am ]
Post subject:  Re: Do you think a leakdown test is in order.
Compression and leakdown test are cheap way to find out if your valves are leaking.
Author:  OwenDickeson [ Mon Dec 20, 2010 11:56 am ]
Post subject:  Re: Do you think a leakdown test is in order.
I'd say screw it and send in your heads to BPS after the season and let them send you some Iron Mountain heads.
Author:  D Duck [ Tue Dec 21, 2010 12:16 pm ]
Post subject:  Re: Do you think a leakdown test is in order.
bbb - you are going to have to increase the compression to get the torque to carry a load at higher speeds. Iron Mtn heads did wonders for my motor.
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