1999 Longhorn Nautique Restoration Thread |
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rosconole
Gold Member Joined: May-10-2008 Location: United States Status: Offline Points: 759 |
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Yes you might be on the edge transmission wise, in comparison torque wise 3rd gear is usually the one that goes in a T-5 manual once you get over 400hp/torque. being your typically in lower RPM you might be ok with a larger oil cooler for awhile but looks like 80 series might be next step up.
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1989 ski nautique ,1991 barefoot nautique, 1993 Mustang Cobra 1998 5.0 Magazine shootout invitee
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1831 |
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Yeah, I'd forgotten the plan for the floor. That should look nice.
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Eh - I have broken about a half dozen drive shafts and bent a pylon pretty good but my 40 series transmission has over 800 hrs on it without so much as a fluid change. Those transmissions were used behind pythons from the factory and they made pretty decent torque. |
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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Bob got the new intake manifold installed and I got to see the engine on the dyno. The intake swap transformed the hp and torque curve. I lost a little torque down low but widened the power band significantly. Peak HP 438.2 at 5500 rpm. Peak TQ 460.2 at 4200 rpm. At 5200 rpm I gained 90.2 hp and 91 ft lbs over the GT40 intake. Below is a video of the dyno run. Doesn't tell you anything but it sounds nice!
Video of dyno run! __ |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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That's one of the better real world examples, because you provided the dyno numbers, to see how an engine has to breathe in, combust, and breath out to live up to it's potential. What an increase with some extra fresh air!
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'63 American Skier - '98 Sport Nautique
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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Kinda what I am thinking as well. I already have a larger oil cooler ready to install. My only concern with my current 40a is I have no idea how many hours are on it. |
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beretta5spd
Senior Member Joined: February-16-2013 Location: Gladstone, MB Status: Offline Points: 255 |
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THAT is an impressive difference. Very cool
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1996,1997 Sport Nautique 1986,1992 Ski Nautique - Sold
1995 Sport Nautique - Current |
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ultrarunner
Platinum Member Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1831 |
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Check your PM's Dom..
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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Thanks for reminding me! |
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rosconole
Gold Member Joined: May-10-2008 Location: United States Status: Offline Points: 759 |
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Should be a good package at that number!
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1989 ski nautique ,1991 barefoot nautique, 1993 Mustang Cobra 1998 5.0 Magazine shootout invitee
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Much more in line with what I would have expected. He should have run it up to 6000, looks like power was still climbing.
I wouldn’t worry about the transmission. If Joe and all the 502ci pythons out there can’t kill it, you won’t either. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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If Joe didn't bust his trans, then I agree there is no concern. .
Ross, Why the larger cooler? Unlike a automotive where there's slippage (oil shear) in the converter, a marine clutch packs are locked up. The only time there's gear to gear face slippage is in reverse when the planetary is rotating. I question the need for more cooling with more HP. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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Well since the boat has been in the family since new and has over 4000 hours on it (from the first post in this thread) somebody must know if the transmission has over 4000 hours too or if it's been rebuilt or replaced at some point. Everything else on the boat will be new or refurbished..................you know what you'll end up doing, it's only money. By the way, do you have a marine flame arrestor for that setup that will clear all the pulleys etc. and fit under the engine box without hitting the front of the box? |
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DHMcFadin
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The trans was replaced in 2005. Unfortunately, Sail and Ski no longer has the service records dating that far back. I think it’s safe to assume the new trans has a 1000 hours |
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DHMcFadin
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I should have clarified. I went to a larger dual oil cooler because I wanted an engine oil cooler as well as the trans. |
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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I have a flame arrestor from a PCM ZR409 6.0. With the flame arrestor installed (the one in the video above) the intake sticks out further than the pulleys by about 3 inches. Not sure what I’m going to do there. May have build out the engine cover a little bit. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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That's why I was asking |
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DHMcFadin
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Any alternatives or suggestions?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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I didn’t think you needed a “marine” flame arrestor, isn’t it considered a dry manifold ?
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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Right, on injected engines I thought the flame arrestor was no longer a safety issue. Maybe I'm wrong about that?
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'63 American Skier - '98 Sport Nautique
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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The would be nice! The intake does have a breather hose coming from a pcv on the valve cover.
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C_Heath
Senior Member Joined: January-21-2020 Location: NC Status: Offline Points: 207 |
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so awesome to watch!
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1979 Calipso Runabout (the boat that got it all started)
1988 Mastercraft ProStar 190 (sold) 2000 Pro Air Nautique/GT40 |
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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So what’s the consensus on the flame arrestor. Would a throttle body screen be sufficient? |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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As some Kung Fu type guy once said............."Patience young grasshopper" Ask yourself a few questions 1) Does this thing run on gasoline? 2) Does it suck air in through the throttle body ? 3) Can the engine backfire out the intake? 4) where does that backfire flame and energy want to go? 5) Why does my or any later GM based engines with multipoint fuel injection come equipped with a flame arrestor? 6) Why would this engine not need a flame arrestor? One screen does not make a USCG flame arrestor either by the way |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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Here's a link to a PCM ZR6 engine and if you read down a long ways in the description You'll see words that say it's equipped with a USCG approved flame arrestor.
Just an example, plenty more examples to be found. Look at what you have on the engine on the Dyno-mite video and look at your GT40 arrestor, I figure you'll see words saying they're USCG approved link |
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rosconole
Gold Member Joined: May-10-2008 Location: United States Status: Offline Points: 759 |
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More power its going to make more heat, heat is the #1 killer of any transmission. |
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1989 ski nautique ,1991 barefoot nautique, 1993 Mustang Cobra 1998 5.0 Magazine shootout invitee
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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It might also reference on the arrestor, Underwriters Lab UL1111 approval or SAE J-1928 approval which satisfies the USCG
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DHMcFadin
Senior Member Joined: May-27-2019 Location: Austin, Texas Status: Offline Points: 312 |
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The arrestor I have is straight from a PCM ZR409. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Ross, From what component(s) in a marine trans is the heat generated with the extra HP? |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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We already knew that and the question was whether you'd find something to fit under the engine box since that manifold and throttle body stick way out front and the arrestor adds some more length. Then it turned into a whole new discussion about whether you needed a marine arrestor. (That would have been your easy way out) I think it's pretty iffy whether it would fit, but you'll figure that out That's pretty flat and short already |
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