GN boats in action......

[gn7]

Making that much horsepower with the CI/PSI you have...seems like the static CR would be kind of in the N/A pump gas type range?

Yep. Cylinder pressures are stupid. Specially when you consider a roots goes to full boost on the hit, regardless the RPM. So coming off a corner in one is hell on the lower end. Even at Puddingstone where Bill never lifts, in the corners the engine is pulled down about 2000 RPM by the boat being deeper in the water plus the rudder blocking the prop. Full load at 5000 thru the whole corner just torments the crank and rods. That is the only place we ever tore the snout off the crank.

[2manymustangs]

Yep. Cylinder pressures are stupid. Specially when you consider a roots goes to full boost on the hit, regardless the RPM. So coming off a corner in one is hell on the lower end. Even at Puddingstone where Bill never lifts, in the corners the engine is pulled down about 2000 RPM by the boat being deeper in the water plus the rudder blocking the prop. Full load at 5000 thru the whole corner just torments the crank and rods. That is the only place we ever tore the snout off the crank.

This is why I have such respect for the GNs, I recognize it takes a planning and skills to put one together AND keep it together, MORE than in the other classes that make 5 laps and are done...

[Sharp shooter]

MORE than in the other classes that make 5 laps and are done...

Done? You make it sound like they go home after 5 laps.... What about testing, heats, semi's and the final? And keep in mind that many of the GN boats aren't running the entire race at "full" throttle.

I'm not saying your point is wrong, but give the other classes a little more credit.

[2manymustangs]

Done? You make it sound like they go home after 5 laps.... What about testing, heats, semi's and the final? And keep in mind that many of the GN boats aren't running the entire race at "full" throttle.

I'm not saying your point is wrong, but give the other classes a little more credit.

No, no, no, no, I didn't mean it like that at all... No DISrespect for the K's or SS/PS or cracker class is meant in any way...

It's just that the GNs are my fave and partially due to the abuse that they endure and the water conditions that they can run in...

Watching TY and Robbie in the SS shootout of the century at Long Beach, gunnel to gunnel lap after lap, two years ago was like poetry in motion, The crazily overpowered K's are amazing and wild... BUT the GNs and the conditions they endure are amazing to me...

[Sharp shooter]

Hey Bruce, when I switched my video hobby to a business in 1997 my first paying client was Bob Devine. Robbie won both races that day and in the weeks after Bob proceeded to bootleg and distribute videos to the rest of the GN teams. I was well known quickly because of it.

Here's that video.

[2manymustangs]

Hey Bruce, when I switched my video hobby to a business in 1997 my first paying client was Bob Devine. Robbie won both races that day and in the weeks after Bob proceeded to bootleg and distribute videos to the rest of the GN teams. I was well known quickly because of it.

Here's that video.

Nice... Ole Robbie looked YOUNG, I guess we all looked younger 16 years ago...

That #13 boat looked like a scary ride in the second heat up to the point when he broke down...

[Sharp shooter]

Nice... Ole Robbie looked YOUNG, I guess we all looked younger 16 years ago...

That #13 boat looked like a scary ride in the second heat up to the point when he broke down...

That was the late Lance Faulkner in Kenny Wilcoxsons boat.

[FormulaZR]

Yep. Cylinder pressures are stupid. Specially when you consider a roots goes to full boost on the hit, regardless the RPM. So coming off a corner in one is hell on the lower end. Even at Puddingstone where Bill never lifts, in the corners the engine is pulled down about 2000 RPM by the boat being deeper in the water plus the rudder blocking the prop. Full load at 5000 thru the whole corner just torments the crank and rods. That is the only place we ever tore the snout off the crank.

I guess I have lot of questions about the engines...how do you control detonation? I mean, all I can think of is backing the timing down or run pig rich....but if you did, you'd never crest the 1k hp mark. Very high octane?

[gn7]

I guess I have lot of questions about the engines...how do you control detonation? I mean, all I can think of is backing the timing down or run pig rich....but if you did, you'd never crest the 1k hp mark. Very high octane?

Lot of water flow thru the heads with a few tweeks to keep them as cool as possible. Piston oilers to keep the heat down in them along with a with other things I don't really care to reveal online, and yes, C16 fuel.

[Sharp shooter]