TSC1 Nautique Top Speed?

It's the angle(rake) of the blade to the hub

Toertel wrote: TRBenj wrote: Pegged? In what direction? A hard run followed by a return to idle can sometimes cause the temp to creep up 10-20 deg... Any more than that and something isn't right. You shouldn't see the temp creeping up while you're at speed- that's not normal either. You should be able to run at high rpm for extended periods (think barefooting) without issue. I should not post in the middle of the night after some drinks... What I wanted to say is, that the temp is always the same once warm ( shy of 160) even after longer runs at 4000 ish. But when running at top end it creeps up a bit (+10) and once back to lower rps drops in seconds to what I see all day

That's normal. Run it like you stole it.

Nope, that's not the way to think about it either, Ken. The tsc hull is a slow one- it plants the nose by design in order to make the slalom wake small. A prop like that oj you have exacerbates that slightly since it has less aft rake than something like an acme 422. That will lift the stern slightly, which pushes the bow down.

Toertel, I'm not convinced that elevated temps at high speed are normal, my PCM fords certainly don't behave that way. Your RWP may be marginal.

5200 here, 80 degree water and it doesn't creep up.

No plate but I'd ignore it if it did... I tear off the tag on my mattress too.

Hollywood wrote: Tim is misleading you a bit.

Thx Hollywood. But I did listen to him anyway and ordered a 422 prop, hoping that Nautiquehunter can borrow me a prop puller

I never took a look to see what thermostat my boat has but I'd suspect HW is right...

Seb, mine idles at 160F but running wot for a few mins mine dips even cooler maybe 158ish. I'd check your water pump and hoses... make sure it is sealed up well and you have the right impeller in.

As far as running wide open of course pulling out I roll throttle down to the floor then I back to the desired speed. for me footing is typically around 3800-3900 rpm right around 40..

My temps fluctuate a bit, but not more than 10-15 degrees.......although its hard to tell with the new temp gauge I recently installed. As long as it never hits 180, I'm not worried.

The graduations make it difficult to get an accurate reading.

VDO Gauge

I don’t know that I would agree that it is completely irrelevant. While under most cases where my temp creeps up under high speed runs I find that it is due to a slight deficiency in my cooling system (IE my hi-tech strainer/transmission cooler has some weeds in it) the tune of the engine at wot can significantly effect the heat load of the engine and the ability of the cooling system to react to it.   IMHO/limited experience the GT40 engines run relatively lean on the top end compared to the big ol calibrated leaks Trbenj or myself are currently running and that can greatly increase cylinder head temp and show up on the temp gauge.   Either way if it gets hot(hotter) at speed you might want to find out why or not run it like that.   Check strainer, for belt slippage at high speed, leaks, then impeller, if those are good change the thermostat out/check for other system blockages. Still having an issue check the timing and do some plug chops. If all that is perfect and you still have some high speed high temp issues then look at the circulating pump, I have seen the vanes on cheapo replacements rust off to nothing, and have seen the expensive bronze bidirectional ones where the impeller spun on the shaft internal to the pump.   Both of those I only found after I caused massive internal damage to the engine but running it hot wide open – apparently the valves and the pistons aren’t supposed to be in the same place at the same time.   

Ok... just out on lake tinkering with perfect pass etc... and decided to calibrate to gps and I found everything dead on at 34.2 mph and 36 mph but I found the paddle wheel was lying to me wot and showing 47.2 yet the fastest I read on gps was toggling between 45 and 46. again I am at 2461ft above sea level if that matters. Crazy that the airguide was more accurate.

So I wonder if replacing the paddle wheel would help increase the accuracy.

At 36 mph everything just sounds and feels right on that boat!

How does star gazer deal with river currents or do you just have to calculate manually?

quinner wrote: My TSC2 206 has been clocked at over 80mph and that's a fact, ask Paul Gundriver, Joe in NY or Timmy, they can all verify!!

That was going backwards too. Would have been faster cept for that pesky log...

Why do you think he didn't bring his boat this year? Damn campground hasn't removed that log yet.

If the river is flowing at 3 mph it will affect your GPS, just run both directions on the river and average your speed with GPS.

As far as heating up while running hard make sure your timing is adjusted properly. A couple degree's too much can easily heat up the heads or if more advanced burn a piston. I know the Chevy blocks don't want more than 36-37 degree's or with Vortec heads more like 28 degree's timing at full throttle above 3,000 rpm. Fords are close to those numbers but I don't know for sure. You can check this with a set back timing light, they have a dial that lets you check the timing at various RPM, timing at idle is not nearly as important as proper timing at 3,000-3,500 RPM.

Kind of like landing an hour early on a 5 hour flight because you get a favorable tail wind.