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The 2.55 ratio with some props produces a tad more thrust at cruise RPM's which if you have a bigger boat could be advantageuse. The rule of thrumb we like is 76 long and below 2.38 and 77 to 79 sometimes 80 a 2.55 and 80 and up a 2.68. As always nothing is always the best in every case such as...

Customer was being told it would make less thrust and the prop would turn slower. Neither was true and we had to prove it, in order that our motor to get the gear ratio that will perform the best.

We did a simple quick test mostly because a customer was being missled by someone. We took one of our 430CUI EFI motors and ran it with a 82'' 3 blade JR with both a 2.55 then a 2.68 ratio OX BOX. The humidity was 45% ambeaint air temp was 74.5 and the air density or corrected altitude was...

Did you have good throttle response in the beginning. If it ran right before and now it doesnt with the holley system it's pretty simple. 1ST OFF IF YOU LEFT THE O2 IN 99% OF the time thats it. Hook a laptop to it or a hand held and read your O2 A/F If you left it in I bet its reading dead lean...

We were playing around today because a customer swore his boat pushed better at wide open with a 2.55 over a 2.68 ratio. Over the past 15 years we have seen everytime with the same change pitch the 2.55 turns around 300RPM 's less with the same exact prop. So for a 2.55 to turn the same RPM as...

I was just explaining this on Northern site and thought some on here would be interested. Pushrod motor has more valve velocity which means more port velocity. This enhances throttle response and torque. The over head valve design generally the valves move slower. Pushrod has a advantage at...

Waterthunder Performance is building a FORD for a airboat! We have been looking forward to this for 2 years. We tried getting one of Fords new Godzilla motors from John Kaase 2 years ago. It's Fords 1st pushrod motor in decades I believe it is their attempt for a option to their diesel engine...

I haven't been on the site in years. We have been slammed in the shop but I'm taking on a fun project for me. My goal is to build a nasty ass motor with all junk shop dropping parts. Going to be fun and push some envelopes using damaged parts. 1st Off is Im using a block from another marine...

https://southernairboat.com/wp/wp-content/uploads/rtMedia/users/585/2018/09/thrust-graph-cut-trim.jpg A lot of data correlates on this sheet. I was talking to someone at Sensenich about testing of a different blade profile and they said with prop thrust a REAL good base number with a reducted...

Get ready folks the guys at Sensenich have came up with a new blade profile its making more thrust with less surface area. Going to be a game changer. We tested 3 different blades back to back to back with the same air temp, humidity and corrected altitude the proto type blade made more thrust...

I had a cool mini motor project going on that I never finished. I have two JUST FRESHENED up EFI SUBARU motors, one is a 4cyl completely gone thru we did a head swap for lowend torque and power. The other is a Subaru 6 cylinder which also was completely gone thru. Both motors are insainly light...

The freedom ride is in February right? How many SA members plan on riding it. Over the years I have been missing all these rides because of travel ball team I have been managing for 5 years. But now our players are entering high school. And we don't have any tourneys till HS season is over. And...

It's been 15 years since I built my last A/C motor but I have a racing buddy who did the usual. Stroked a motor , ran a longer Lycoming rod, Put in dome pistons and jacked the compression way up. Then ran a stock or mild cam and now wonders why the motor lays over on the big end. After calling 5...

I received a call from a customer this weekend who sunk their boat. So we went over these procedures. When a boat is sunk the 1st thing you should do is turn off the battery switch an pull the ground wire off the battery. His boat was upside down and completely submerged for over a day and...

Wade an the guy's built one hell of a SWEET boat this thing is a beast. She rides so sweet in the water and cruises effortlessly. We loved the phone call from Wade asking whats up with this 550HP. Our 550HP motors have come to the point where a 3 blade is no where near enough prop. Wade said...

Pretty cool video a customer of ours is in. He says they play the video at the LSU home games. NxdfnKcEH7A

The season finally NAADR race will be PEE WEE's last unlimited race. After a lifetime of hard racing and 2 championships Chuck an me feel PEE WEE deserves a good retirement to a nice family ride boat. She got her name PEE WEE because she is the smallest motor in her class at only 427 cubic...

A customer just brought his boat in to install a new waterpump. I was looking at the airdoor and had to laugh. We built this motor over 9 years ago back then nobody made a good airdoor for an LS yet so we took a factory fly bye wire one and modified it. Changed the shaft and added a throttle arm...

This is a old video and now that we don't use this EFI controler and we have progressed far from these day's. I was going to share it we did not want to share our data acquisition equipment so we used a volt meter to display the thrust data, and a hand held weather station to show corrected...

Been having a ball with this boat, she cruises at 1400RPM's. We still have a ton of work we need to make some major rigging changes but so far she has ran very impressive even out ran a SBC with a gearbox on a step hull wends night at laughmans. Plus 3 other 406 V/8 SBC boats with gearboxes and...